diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index b3f7d01..a92794f 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -30,7 +30,7 @@ jobs:
     strategy:
       matrix:
         os: [windows-latest, ubuntu-latest, macos-latest]
-        node: [16]
+        node: [22]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
diff --git a/eo2js-runtime/.eslintrc.json b/eo2js-runtime/.eslintrc.json
deleted file mode 100644
index 7c94be9..0000000
--- a/eo2js-runtime/.eslintrc.json
+++ /dev/null
@@ -1,16 +0,0 @@
-{
-  "env": {
-    "es6": true
-  },
-  "extends": "google",
-  "rules": {
-    "semi": "off",
-    "comma-dangle": "off",
-    "indent": [ "error", 2 ],
-    "camelcase": "off",
-    "max-len": [ "error", { "code": 300 } ]
-  },
-  "parserOptions": {
-    "ecmaVersion": 2019
-  }
-}
diff --git a/eo2js-runtime/Gruntfile.js b/eo2js-runtime/Gruntfile.js
index 793d6ae..43fd118 100644
--- a/eo2js-runtime/Gruntfile.js
+++ b/eo2js-runtime/Gruntfile.js
@@ -7,13 +7,13 @@ module.exports = function(grunt) {
         options: {
           timeout: '1200000',
           require: ['test/global.js'],
-          files: ['test/**/*.test.js'],
+          files: ['test/regular.js'],
         },
       },
     },
     eslint: {
       options: {
-        overrideConfigFile: '.eslintrc.json',
+        overrideConfigFile: 'eslint.config.js',
       },
       target: ['Gruntfile.js', 'src/**/*.js', 'test/**/*.js'],
     },
diff --git a/eo2js-runtime/eslint.config.js b/eo2js-runtime/eslint.config.js
new file mode 100644
index 0000000..2434ea1
--- /dev/null
+++ b/eo2js-runtime/eslint.config.js
@@ -0,0 +1,36 @@
+const js = require('@eslint/js')
+const jsdoc = require('eslint-plugin-jsdoc')
+const globals = require('globals')
+
+module.exports = [
+  js.configs.recommended,
+  jsdoc.configs['flat/recommended'],
+  {
+    plugins: {
+      jsdoc
+    },
+    files: ["**/*.js"],
+    rules: {
+      "jsdoc/require-description": "error",
+      "jsdoc/check-values": "error"
+    }
+  },
+  {
+    rules: {
+      semi: 'off',
+      'comma-dangle': 'off',
+      indent: ['error', 2],
+      camelcase: 'off',
+      'max-len': ['error', {'code': 300}],
+      'no-unused-vars': ['error', {argsIgnorePattern: '^_'}],
+    },
+    languageOptions: {
+      globals: {
+        ...globals.node,
+        ...globals.mocha,
+      },
+      ecmaVersion: 'latest',
+      sourceType: 'commonjs',
+    }
+  }
+]
\ No newline at end of file
diff --git a/eo2js-runtime/package-lock.json b/eo2js-runtime/package-lock.json
index 09a0576..8bc296d 100644
--- a/eo2js-runtime/package-lock.json
+++ b/eo2js-runtime/package-lock.json
@@ -10,12 +10,30 @@
       "license": "MIT",
       "devDependencies": {
         "eslint": "9.5.0",
-        "eslint-config-google": "0.14.0",
+        "eslint-plugin-jsdoc": "^48.5.0",
         "grunt": "1.6.1",
         "grunt-contrib-clean": "2.0.1",
-        "grunt-eslint": "24.3.0",
+        "grunt-eslint": "25.0.0",
         "grunt-mocha-cli": "^7.0.0",
-        "mocha": "^10.2.0"
+        "mocha": "^10.5.2"
+      }
+    },
+    "node_modules/@es-joy/jsdoccomment": {
+      "version": "0.43.1",
+      "resolved": "https://registry.npmjs.org/@es-joy/jsdoccomment/-/jsdoccomment-0.43.1.tgz",
+      "integrity": "sha512-I238eDtOolvCuvtxrnqtlBaw0BwdQuYqK7eA6XIonicMdOOOb75mqdIzkGDUbS04+1Di007rgm9snFRNeVrOog==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/eslint": "^8.56.5",
+        "@types/estree": "^1.0.5",
+        "@typescript-eslint/types": "^7.2.0",
+        "comment-parser": "1.4.1",
+        "esquery": "^1.5.0",
+        "jsdoc-type-pratt-parser": "~4.0.0"
+      },
+      "engines": {
+        "node": ">=16"
       }
     },
     "node_modules/@eslint-community/eslint-utils": {
@@ -160,12 +178,6 @@
         "url": "https://github.com/sponsors/nzakas"
       }
     },
-    "node_modules/@humanwhocodes/object-schema": {
-      "version": "2.0.3",
-      "resolved": "https://registry.npmjs.org/@humanwhocodes/object-schema/-/object-schema-2.0.3.tgz",
-      "integrity": "sha512-93zYdMES/c1D69yZiKDBj0V24vqNzB/koF26KPaagAfd3P/4gUlh3Dys5ogAK+Exi9QyzlD8x/08Zt7wIKcDcA==",
-      "dev": true
-    },
     "node_modules/@humanwhocodes/retry": {
       "version": "0.3.0",
       "resolved": "https://registry.npmjs.org/@humanwhocodes/retry/-/retry-0.3.0.tgz",
@@ -215,6 +227,58 @@
         "node": ">= 8"
       }
     },
+    "node_modules/@pkgr/core": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/@pkgr/core/-/core-0.1.1.tgz",
+      "integrity": "sha512-cq8o4cWH0ibXh9VGi5P20Tu9XF/0fFXl9EUinr9QfTM7a7p0oTA4iJRCQWppXR1Pg8dSM0UCItCkPwsk9qWWYA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^12.20.0 || ^14.18.0 || >=16.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/unts"
+      }
+    },
+    "node_modules/@types/eslint": {
+      "version": "8.56.10",
+      "resolved": "https://registry.npmjs.org/@types/eslint/-/eslint-8.56.10.tgz",
+      "integrity": "sha512-Shavhk87gCtY2fhXDctcfS3e6FdxWkCx1iUZ9eEUbh7rTqlZT0/IzOkCOVt0fCjcFuZ9FPYfuezTBImfHCDBGQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/estree": "*",
+        "@types/json-schema": "*"
+      }
+    },
+    "node_modules/@types/estree": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.5.tgz",
+      "integrity": "sha512-/kYRxGDLWzHOB7q+wtSUQlFrtcdUccpfy+X+9iMBpHK8QLLhx2wIPYuS5DYtR9Wa/YlZAbIovy7qVdB1Aq6Lyw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@types/json-schema": {
+      "version": "7.0.15",
+      "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.15.tgz",
+      "integrity": "sha512-5+fP8P8MFNC+AyZCDxrB2pkZFPGzqQWUzpSeuuVLvm8VMcorNYavBqoFcxK8bQz4Qsbn4oUEEem4wDLfcysGHA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@typescript-eslint/types": {
+      "version": "7.14.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-7.14.1.tgz",
+      "integrity": "sha512-mL7zNEOQybo5R3AavY+Am7KLv8BorIv7HCYS5rKoNZKQD9tsfGUpO4KdAn3sSUvTiS4PQkr2+K0KJbxj8H9NDg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^18.18.0 || >=20.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      }
+    },
     "node_modules/@ungap/promise-all-settled": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/@ungap/promise-all-settled/-/promise-all-settled-1.1.2.tgz",
@@ -222,13 +286,6 @@
       "dev": true,
       "license": "ISC"
     },
-    "node_modules/@ungap/structured-clone": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/@ungap/structured-clone/-/structured-clone-1.2.0.tgz",
-      "integrity": "sha512-zuVdFrMJiuCDQUMCzQaD6KL28MjnqqN8XnAqiEq9PNm/hCPTSGfrXCOfwj1ow4LFb/tNymJPwsNbVePc1xFqrQ==",
-      "dev": true,
-      "license": "ISC"
-    },
     "node_modules/abbrev": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
@@ -320,6 +377,16 @@
         "node": ">= 8"
       }
     },
+    "node_modules/are-docs-informative": {
+      "version": "0.0.2",
+      "resolved": "https://registry.npmjs.org/are-docs-informative/-/are-docs-informative-0.0.2.tgz",
+      "integrity": "sha512-ixiS0nLNNG5jNQzgZJNoUpBKdo9yTYZMGJ+QgT2jmjR7G7+QHRCc4v6LQ3NgE7EBJq+o0ams3waJwkrlBom8Ig==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=14"
+      }
+    },
     "node_modules/argparse": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-2.0.1.tgz",
@@ -509,6 +576,16 @@
         "node": ">=0.1.90"
       }
     },
+    "node_modules/comment-parser": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/comment-parser/-/comment-parser-1.4.1.tgz",
+      "integrity": "sha512-buhp5kePrmda3vhc5B9t7pUQXAb2Tnd0qgpkIhPhkHXxJpiPJ11H0ZEU0oBpJ2QztSbzG/ZxMj/CHsYJqRHmyg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 12.0.0"
+      }
+    },
     "node_modules/concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
@@ -597,24 +674,19 @@
         "node": ">=0.3.1"
       }
     },
-    "node_modules/doctrine": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/doctrine/-/doctrine-3.0.0.tgz",
-      "integrity": "sha512-yS+Q5i3hBf7GBkd4KG8a7eBNNWNGLTaEwwYWUijIYM7zrlYDM0BFXHjjPWlWZ1Rg7UaddZeIDmi9jF3HmqiQ2w==",
-      "dev": true,
-      "dependencies": {
-        "esutils": "^2.0.2"
-      },
-      "engines": {
-        "node": ">=6.0.0"
-      }
-    },
     "node_modules/emoji-regex": {
       "version": "8.0.0",
       "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
       "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
       "dev": true
     },
+    "node_modules/es-module-lexer": {
+      "version": "1.5.4",
+      "resolved": "https://registry.npmjs.org/es-module-lexer/-/es-module-lexer-1.5.4.tgz",
+      "integrity": "sha512-MVNK56NiMrOwitFB7cqDwq0CQutbw+0BvLshJSse0MUNU+y1FC3bUS/AQg7oUng+/wKrrki7JfmwtVHkVfPLlw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/escalade": {
       "version": "3.1.2",
       "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.1.2.tgz",
@@ -688,16 +760,29 @@
         "url": "https://eslint.org/donate"
       }
     },
-    "node_modules/eslint-config-google": {
-      "version": "0.14.0",
-      "resolved": "https://registry.npmjs.org/eslint-config-google/-/eslint-config-google-0.14.0.tgz",
-      "integrity": "sha512-WsbX4WbjuMvTdeVL6+J3rK1RGhCTqjsFjX7UMSMgZiyxxaNLkoJENbrGExzERFeoTpGw3F3FypTiWAP9ZXzkEw==",
+    "node_modules/eslint-plugin-jsdoc": {
+      "version": "48.5.0",
+      "resolved": "https://registry.npmjs.org/eslint-plugin-jsdoc/-/eslint-plugin-jsdoc-48.5.0.tgz",
+      "integrity": "sha512-ukXPNpGby3KjCveCizIS8t1EbuJEHYEu/tBg8GCbn/YbHcXwphyvYCdvRZ/oMRfTscGSSzfsWoZ+ZkAP0/6YMQ==",
       "dev": true,
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "@es-joy/jsdoccomment": "~0.43.1",
+        "are-docs-informative": "^0.0.2",
+        "comment-parser": "1.4.1",
+        "debug": "^4.3.4",
+        "escape-string-regexp": "^4.0.0",
+        "esquery": "^1.5.0",
+        "parse-imports": "^2.1.0",
+        "semver": "^7.6.2",
+        "spdx-expression-parse": "^4.0.0",
+        "synckit": "^0.9.0"
+      },
       "engines": {
-        "node": ">=0.10.0"
+        "node": ">=18"
       },
       "peerDependencies": {
-        "eslint": ">=5.16.0"
+        "eslint": "^7.0.0 || ^8.0.0 || ^9.0.0"
       }
     },
     "node_modules/eslint-scope": {
@@ -1190,12 +1275,6 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
-    "node_modules/graphemer": {
-      "version": "1.4.0",
-      "resolved": "https://registry.npmjs.org/graphemer/-/graphemer-1.4.0.tgz",
-      "integrity": "sha512-EtKwoO6kxCL9WO5xipiHTZlSzBm7WLT627TqC/uVRd0HKmq8NXyebnNYxDoBi7wt8eTWrUrKXCOVaFq9x1kgag==",
-      "dev": true
-    },
     "node_modules/growl": {
       "version": "1.10.5",
       "resolved": "https://registry.npmjs.org/growl/-/growl-1.10.5.tgz",
@@ -1336,16 +1415,17 @@
       }
     },
     "node_modules/grunt-eslint": {
-      "version": "24.3.0",
-      "resolved": "https://registry.npmjs.org/grunt-eslint/-/grunt-eslint-24.3.0.tgz",
-      "integrity": "sha512-dUPiRgX8fhmh4uwTAn9xrzg7HV5j5DhGmZZGJdHfjy/AN9G4jD+5IjfbcAJ209JcIG8m4B7xz3crIhuDSm3siQ==",
+      "version": "25.0.0",
+      "resolved": "https://registry.npmjs.org/grunt-eslint/-/grunt-eslint-25.0.0.tgz",
+      "integrity": "sha512-JIV5IPgOuacorFLmYtUTq0n+0qGIL9FSQJ4KVnNfCg/8Fm+K1t6OWrzXXI8TxWTwq2K9E3parFVXCpn1sGLbKQ==",
       "dev": true,
+      "license": "MIT",
       "dependencies": {
         "chalk": "^4.1.2",
-        "eslint": "^8.44.0"
+        "eslint": "^9.0.0"
       },
       "engines": {
-        "node": ">=12"
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       },
       "funding": {
         "url": "https://github.com/sponsors/sindresorhus"
@@ -1354,227 +1434,6 @@
         "grunt": ">=1"
       }
     },
-    "node_modules/grunt-eslint/node_modules/@eslint/eslintrc": {
-      "version": "2.1.4",
-      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-2.1.4.tgz",
-      "integrity": "sha512-269Z39MS6wVJtsoUl10L60WdkhJVdPG24Q4eZTH3nnF6lpvSShEK3wQjDX9JRWAUPvPh7COouPpU9IrqaZFvtQ==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "ajv": "^6.12.4",
-        "debug": "^4.3.2",
-        "espree": "^9.6.0",
-        "globals": "^13.19.0",
-        "ignore": "^5.2.0",
-        "import-fresh": "^3.2.1",
-        "js-yaml": "^4.1.0",
-        "minimatch": "^3.1.2",
-        "strip-json-comments": "^3.1.1"
-      },
-      "engines": {
-        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
-      },
-      "funding": {
-        "url": "https://opencollective.com/eslint"
-      }
-    },
-    "node_modules/grunt-eslint/node_modules/@eslint/js": {
-      "version": "8.57.0",
-      "resolved": "https://registry.npmjs.org/@eslint/js/-/js-8.57.0.tgz",
-      "integrity": "sha512-Ys+3g2TaW7gADOJzPt83SJtCDhMjndcDMFVQ/Tj9iA1BfJzFKD9mAUXT3OenpuPHbI6P/myECxRJrofUsDx/5g==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
-      }
-    },
-    "node_modules/grunt-eslint/node_modules/@humanwhocodes/config-array": {
-      "version": "0.11.14",
-      "resolved": "https://registry.npmjs.org/@humanwhocodes/config-array/-/config-array-0.11.14.tgz",
-      "integrity": "sha512-3T8LkOmg45BV5FICb15QQMsyUSWrQ8AygVfC7ZG32zOalnqrilm018ZVCw0eapXux8FtA33q8PSRSstjee3jSg==",
-      "dev": true,
-      "license": "Apache-2.0",
-      "dependencies": {
-        "@humanwhocodes/object-schema": "^2.0.2",
-        "debug": "^4.3.1",
-        "minimatch": "^3.0.5"
-      },
-      "engines": {
-        "node": ">=10.10.0"
-      }
-    },
-    "node_modules/grunt-eslint/node_modules/brace-expansion": {
-      "version": "1.1.11",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
-      "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
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-      "license": "MIT",
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-        "balanced-match": "^1.0.0",
-        "concat-map": "0.0.1"
-      }
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-      "resolved": "https://registry.npmjs.org/eslint/-/eslint-8.57.0.tgz",
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-      "license": "MIT",
-      "dependencies": {
-        "@eslint-community/eslint-utils": "^4.2.0",
-        "@eslint-community/regexpp": "^4.6.1",
-        "@eslint/eslintrc": "^2.1.4",
-        "@eslint/js": "8.57.0",
-        "@humanwhocodes/config-array": "^0.11.14",
-        "@humanwhocodes/module-importer": "^1.0.1",
-        "@nodelib/fs.walk": "^1.2.8",
-        "@ungap/structured-clone": "^1.2.0",
-        "ajv": "^6.12.4",
-        "chalk": "^4.0.0",
-        "cross-spawn": "^7.0.2",
-        "debug": "^4.3.2",
-        "doctrine": "^3.0.0",
-        "escape-string-regexp": "^4.0.0",
-        "eslint-scope": "^7.2.2",
-        "eslint-visitor-keys": "^3.4.3",
-        "espree": "^9.6.1",
-        "esquery": "^1.4.2",
-        "esutils": "^2.0.2",
-        "fast-deep-equal": "^3.1.3",
-        "file-entry-cache": "^6.0.1",
-        "find-up": "^5.0.0",
-        "glob-parent": "^6.0.2",
-        "globals": "^13.19.0",
-        "graphemer": "^1.4.0",
-        "ignore": "^5.2.0",
-        "imurmurhash": "^0.1.4",
-        "is-glob": "^4.0.0",
-        "is-path-inside": "^3.0.3",
-        "js-yaml": "^4.1.0",
-        "json-stable-stringify-without-jsonify": "^1.0.1",
-        "levn": "^0.4.1",
-        "lodash.merge": "^4.6.2",
-        "minimatch": "^3.1.2",
-        "natural-compare": "^1.4.0",
-        "optionator": "^0.9.3",
-        "strip-ansi": "^6.0.1",
-        "text-table": "^0.2.0"
-      },
-      "bin": {
-        "eslint": "bin/eslint.js"
-      },
-      "engines": {
-        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
-      },
-      "funding": {
-        "url": "https://opencollective.com/eslint"
-      }
-    },
-    "node_modules/grunt-eslint/node_modules/eslint-scope": {
-      "version": "7.2.2",
-      "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-7.2.2.tgz",
-      "integrity": "sha512-dOt21O7lTMhDM+X9mB4GX+DZrZtCUJPL/wlcTqxyrx5IvO0IYtILdtrQGQp+8n5S0gwSVmOf9NQrjMOgfQZlIg==",
-      "dev": true,
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-      "dev": true,
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-    "node_modules/grunt-eslint/node_modules/globals": {
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-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "type-fest": "^0.20.2"
-      },
-      "engines": {
-        "node": ">=8"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/sindresorhus"
-      }
-    },
-    "node_modules/grunt-eslint/node_modules/minimatch": {
-      "version": "3.1.2",
-      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.2.tgz",
-      "integrity": "sha512-J7p63hRiAjw1NDEww1W7i37+ByIrOWO5XQQAzZ3VOcL0PNybwpfmV/N05zFAzwQ9USyEcX6t3UO+K5aqBQOIHw==",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "brace-expansion": "^1.1.7"
-      },
-      "engines": {
-        "node": "*"
-      }
-    },
     "node_modules/grunt-known-options": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/grunt-known-options/-/grunt-known-options-2.0.0.tgz",
@@ -2209,6 +2068,16 @@
         "js-yaml": "bin/js-yaml.js"
       }
     },
+    "node_modules/jsdoc-type-pratt-parser": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/jsdoc-type-pratt-parser/-/jsdoc-type-pratt-parser-4.0.0.tgz",
+      "integrity": "sha512-YtOli5Cmzy3q4dP26GraSOeAhqecewG04hoO8DY56CH4KJ9Fvv5qKWUCCo3HZob7esJQHCv6/+bnTy72xZZaVQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12.0.0"
+      }
+    },
     "node_modules/json-buffer": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/json-buffer/-/json-buffer-3.0.1.tgz",
@@ -2615,6 +2484,20 @@
         "node": ">=0.8"
       }
     },
+    "node_modules/parse-imports": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/parse-imports/-/parse-imports-2.1.0.tgz",
+      "integrity": "sha512-JQWgmK2o4w8leUkZeZPatWdAny6vXGU/3siIUvMF6J2rDCud9aTt8h/px9oZJ6U3EcfhngBJ635uPFI0q0VAeA==",
+      "dev": true,
+      "license": "Apache 2.0",
+      "dependencies": {
+        "es-module-lexer": "^1.5.3",
+        "slashes": "^3.0.12"
+      },
+      "engines": {
+        "node": ">= 18"
+      }
+    },
     "node_modules/parse-passwd": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/parse-passwd/-/parse-passwd-1.0.0.tgz",
@@ -2819,67 +2702,6 @@
         "node": ">=0.10.0"
       }
     },
-    "node_modules/rimraf": {
-      "version": "3.0.2",
-      "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-3.0.2.tgz",
-      "integrity": "sha512-JZkJMZkAGFFPP2YqXZXPbMlMBgsxzE8ILs4lMIX/2o0L9UBw9O/Y3o6wFw/i9YLapcUJWwqbi3kdxIPdC62TIA==",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "glob": "^7.1.3"
-      },
-      "bin": {
-        "rimraf": "bin.js"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/isaacs"
-      }
-    },
-    "node_modules/rimraf/node_modules/brace-expansion": {
-      "version": "1.1.11",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
-      "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "balanced-match": "^1.0.0",
-        "concat-map": "0.0.1"
-      }
-    },
-    "node_modules/rimraf/node_modules/glob": {
-      "version": "7.2.3",
-      "resolved": "https://registry.npmjs.org/glob/-/glob-7.2.3.tgz",
-      "integrity": "sha512-nFR0zLpU2YCaRxwoCJvL6UvCH2JFyFVIvwTLsIf21AuHlMskA1hhTdk+LlYJtOlYt9v6dvszD2BGRqBL+iQK9Q==",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "fs.realpath": "^1.0.0",
-        "inflight": "^1.0.4",
-        "inherits": "2",
-        "minimatch": "^3.1.1",
-        "once": "^1.3.0",
-        "path-is-absolute": "^1.0.0"
-      },
-      "engines": {
-        "node": "*"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/isaacs"
-      }
-    },
-    "node_modules/rimraf/node_modules/minimatch": {
-      "version": "3.1.2",
-      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.2.tgz",
-      "integrity": "sha512-J7p63hRiAjw1NDEww1W7i37+ByIrOWO5XQQAzZ3VOcL0PNybwpfmV/N05zFAzwQ9USyEcX6t3UO+K5aqBQOIHw==",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "brace-expansion": "^1.1.7"
-      },
-      "engines": {
-        "node": "*"
-      }
-    },
     "node_modules/run-parallel": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/run-parallel/-/run-parallel-1.2.0.tgz",
@@ -2929,6 +2751,19 @@
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       "dev": true
     },
+    "node_modules/semver": {
+      "version": "7.6.2",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.6.2.tgz",
+      "integrity": "sha512-FNAIBWCx9qcRhoHcgcJ0gvU7SN1lYU2ZXuSfl04bSC5OpvDHFyJCjdNHomPXxjQlCBU67YW64PzY7/VIEH7F2w==",
+      "dev": true,
+      "license": "ISC",
+      "bin": {
+        "semver": "bin/semver.js"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/serialize-javascript": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/serialize-javascript/-/serialize-javascript-6.0.0.tgz",
@@ -2959,6 +2794,38 @@
         "node": ">=8"
       }
     },
+    "node_modules/slashes": {
+      "version": "3.0.12",
+      "resolved": "https://registry.npmjs.org/slashes/-/slashes-3.0.12.tgz",
+      "integrity": "sha512-Q9VME8WyGkc7pJf6QEkj3wE+2CnvZMI+XJhwdTPR8Z/kWQRXi7boAWLDibRPyHRTUTPx5FaU7MsyrjI3yLB4HA==",
+      "dev": true,
+      "license": "ISC"
+    },
+    "node_modules/spdx-exceptions": {
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/spdx-exceptions/-/spdx-exceptions-2.5.0.tgz",
+      "integrity": "sha512-PiU42r+xO4UbUS1buo3LPJkjlO7430Xn5SVAhdpzzsPHsjbYVflnnFdATgabnLude+Cqu25p6N+g2lw/PFsa4w==",
+      "dev": true,
+      "license": "CC-BY-3.0"
+    },
+    "node_modules/spdx-expression-parse": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/spdx-expression-parse/-/spdx-expression-parse-4.0.0.tgz",
+      "integrity": "sha512-Clya5JIij/7C6bRR22+tnGXbc4VKlibKSVj2iHvVeX5iMW7s1SIQlqu699JkODJJIhh/pUu8L0/VLh8xflD+LQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "spdx-exceptions": "^2.1.0",
+        "spdx-license-ids": "^3.0.0"
+      }
+    },
+    "node_modules/spdx-license-ids": {
+      "version": "3.0.18",
+      "resolved": "https://registry.npmjs.org/spdx-license-ids/-/spdx-license-ids-3.0.18.tgz",
+      "integrity": "sha512-xxRs31BqRYHwiMzudOrpSiHtZ8i/GeionCBDSilhYRj+9gIcI8wCZTlXZKu9vZIVqViP3dcp9qE5G6AlIaD+TQ==",
+      "dev": true,
+      "license": "CC0-1.0"
+    },
     "node_modules/sprintf-js": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.1.3.tgz",
@@ -3030,6 +2897,23 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/synckit": {
+      "version": "0.9.0",
+      "resolved": "https://registry.npmjs.org/synckit/-/synckit-0.9.0.tgz",
+      "integrity": "sha512-7RnqIMq572L8PeEzKeBINYEJDDxpcH8JEgLwUqBd3TkofhFRbkq4QLR0u+36avGAhCRbk2nnmjcW9SE531hPDg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@pkgr/core": "^0.1.0",
+        "tslib": "^2.6.2"
+      },
+      "engines": {
+        "node": "^14.18.0 || >=16.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/unts"
+      }
+    },
     "node_modules/text-table": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
@@ -3048,6 +2932,13 @@
         "node": ">=8.0"
       }
     },
+    "node_modules/tslib": {
+      "version": "2.6.3",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.6.3.tgz",
+      "integrity": "sha512-xNvxJEOUiWPGhUuUdQgAJPKOOJfGnIyKySOc09XkKsgdUV/3E2zvwZYdejjmRgPCgcym1juLH3226yA7sEFJKQ==",
+      "dev": true,
+      "license": "0BSD"
+    },
     "node_modules/type-check": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
@@ -3060,19 +2951,6 @@
         "node": ">= 0.8.0"
       }
     },
-    "node_modules/type-fest": {
-      "version": "0.20.2",
-      "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.20.2.tgz",
-      "integrity": "sha512-Ne+eE4r0/iWnpAxD852z3A+N0Bt5RN//NjJwRd2VFHEmrywxf5vsZlh4R6lixl6B+wz/8d+maTSAkN1FIkI3LQ==",
-      "dev": true,
-      "license": "(MIT OR CC0-1.0)",
-      "engines": {
-        "node": ">=10"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/sindresorhus"
-      }
-    },
     "node_modules/unc-path-regex": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/unc-path-regex/-/unc-path-regex-0.1.2.tgz",
diff --git a/eo2js-runtime/package.json b/eo2js-runtime/package.json
index 30a824d..93d6ef9 100644
--- a/eo2js-runtime/package.json
+++ b/eo2js-runtime/package.json
@@ -11,11 +11,11 @@
   },
   "devDependencies": {
     "eslint": "9.5.0",
-    "eslint-config-google": "0.14.0",
+    "eslint-plugin-jsdoc": "^48.5.0",
     "grunt": "1.6.1",
     "grunt-contrib-clean": "2.0.1",
-    "grunt-eslint": "24.3.0",
+    "grunt-eslint": "25.0.0",
     "grunt-mocha-cli": "^7.0.0",
-    "mocha": "^10.2.0"
+    "mocha": "^10.5.2"
   }
 }
diff --git a/eo2js-runtime/src/objects/org/eolang/as-phi.js b/eo2js-runtime/src/objects/org/eolang/as-phi.js
index 69e2ad2..a82ac77 100644
--- a/eo2js-runtime/src/objects/org/eolang/as-phi.js
+++ b/eo2js-runtime/src/objects/org/eolang/as-phi.js
@@ -5,7 +5,7 @@ const {data} = require('../../../runtime/data');
 
 /**
  * As_phi.
- * @return {Object} - As_phi object
+ * @returns {object} - As_phi object
  */
 const as_phi = function() {
   const obj = object('as_phi')
diff --git a/eo2js-runtime/src/objects/org/eolang/bytes$and.js b/eo2js-runtime/src/objects/org/eolang/bytes$and.js
index 33f80c3..eb8bf39 100644
--- a/eo2js-runtime/src/objects/org/eolang/bytes$and.js
+++ b/eo2js-runtime/src/objects/org/eolang/bytes$and.js
@@ -7,7 +7,7 @@ const {data} = require('../../../runtime/data');
 
 /**
  * Bytes.and.
- * @return {Object} - Bytes.and object
+ * @returns {object} - Bytes.and object
  */
 const bytes$and = function() {
   const obj = object('bytes$and')
diff --git a/eo2js-runtime/src/objects/org/eolang/bytes$concat.js b/eo2js-runtime/src/objects/org/eolang/bytes$concat.js
index 1973cf6..95349d3 100644
--- a/eo2js-runtime/src/objects/org/eolang/bytes$concat.js
+++ b/eo2js-runtime/src/objects/org/eolang/bytes$concat.js
@@ -6,7 +6,7 @@ const dataized = require('../../../runtime/dataized');
 
 /**
  * Bytes.concat.
- * @return {Object} - Bytes.concat object
+ * @returns {object} - Bytes.concat object
  */
 const bytes$concat = function() {
   const obj = object('bytes$concat')
diff --git a/eo2js-runtime/src/objects/org/eolang/bytes$eq.js b/eo2js-runtime/src/objects/org/eolang/bytes$eq.js
index 841c32e..fbd6936 100644
--- a/eo2js-runtime/src/objects/org/eolang/bytes$eq.js
+++ b/eo2js-runtime/src/objects/org/eolang/bytes$eq.js
@@ -6,7 +6,7 @@ const {data} = require('../../../runtime/data');
 
 /**
  * Bytes.eq.
- * @return {Object} - Bytes.eq object
+ * @returns {object} - Bytes.eq object
  */
 const bytes$eq = function() {
   const obj = object('bytes$eq')
diff --git a/eo2js-runtime/src/objects/org/eolang/bytes$not.js b/eo2js-runtime/src/objects/org/eolang/bytes$not.js
index 0722f47..b1ca643 100644
--- a/eo2js-runtime/src/objects/org/eolang/bytes$not.js
+++ b/eo2js-runtime/src/objects/org/eolang/bytes$not.js
@@ -6,7 +6,7 @@ const dataized = require('../../../runtime/dataized');
 
 /**
  * Bytes.not.
- * @return {Object} - Bytes.not object
+ * @returns {object} - Bytes.not object
  */
 const bytes$not = function() {
   const obj = object('bytes$not')
diff --git a/eo2js-runtime/src/objects/org/eolang/bytes$or.js b/eo2js-runtime/src/objects/org/eolang/bytes$or.js
index 36268e1..60a8ceb 100644
--- a/eo2js-runtime/src/objects/org/eolang/bytes$or.js
+++ b/eo2js-runtime/src/objects/org/eolang/bytes$or.js
@@ -7,7 +7,7 @@ const dataized = require('../../../runtime/dataized');
 
 /**
  * Bytes.or.
- * @return {Object} - Bytes.or object
+ * @returns {object} - Bytes.or object
  */
 const bytes$or = function() {
   const obj = object('bytes$or')
diff --git a/eo2js-runtime/src/objects/org/eolang/bytes$right.js b/eo2js-runtime/src/objects/org/eolang/bytes$right.js
index 5e3c8e9..78d1519 100644
--- a/eo2js-runtime/src/objects/org/eolang/bytes$right.js
+++ b/eo2js-runtime/src/objects/org/eolang/bytes$right.js
@@ -7,7 +7,7 @@ const dataized = require('../../../runtime/dataized');
 
 /**
  * Bytes.right.
- * @return {Object} - Bytes.right object
+ * @returns {object} - Bytes.right object
  */
 const bytes$right = function() {
   const obj = object('bytes$right')
diff --git a/eo2js-runtime/src/objects/org/eolang/bytes$size.js b/eo2js-runtime/src/objects/org/eolang/bytes$size.js
index 62c7abb..084b7c6 100644
--- a/eo2js-runtime/src/objects/org/eolang/bytes$size.js
+++ b/eo2js-runtime/src/objects/org/eolang/bytes$size.js
@@ -5,7 +5,7 @@ const dataized = require('../../../runtime/dataized');
 
 /**
  * Bytes.size.
- * @return {Object} - Bytes.size object
+ * @returns {object} - Bytes.size object
  */
 const bytes$size = function() {
   const obj = object('bytes$size')
diff --git a/eo2js-runtime/src/objects/org/eolang/bytes$slice.js b/eo2js-runtime/src/objects/org/eolang/bytes$slice.js
index f8140d0..5abc0f9 100644
--- a/eo2js-runtime/src/objects/org/eolang/bytes$slice.js
+++ b/eo2js-runtime/src/objects/org/eolang/bytes$slice.js
@@ -6,7 +6,7 @@ const dataized = require('../../../runtime/dataized');
 
 /**
  * Bytes.slice.
- * @return {Object} - Bytes.slice object
+ * @returns {object} - Bytes.slice object
  */
 const bytes$slice = function() {
   const obj = object('bytes$slice')
diff --git a/eo2js-runtime/src/objects/org/eolang/bytes$xor.js b/eo2js-runtime/src/objects/org/eolang/bytes$xor.js
index 7dcc017..39efadc 100644
--- a/eo2js-runtime/src/objects/org/eolang/bytes$xor.js
+++ b/eo2js-runtime/src/objects/org/eolang/bytes$xor.js
@@ -7,7 +7,7 @@ const dataized = require('../../../runtime/dataized');
 
 /**
  * Bytes.xor.
- * @return {Object} - Bytes.xor object
+ * @returns {object} - Bytes.xor object
  */
 const bytes$xor = function() {
   const obj = object('bytes$xor')
diff --git a/eo2js-runtime/src/objects/org/eolang/cage$encaged$encage.js b/eo2js-runtime/src/objects/org/eolang/cage$encaged$encage.js
index 3fd1e2b..308d52e 100644
--- a/eo2js-runtime/src/objects/org/eolang/cage$encaged$encage.js
+++ b/eo2js-runtime/src/objects/org/eolang/cage$encaged$encage.js
@@ -7,7 +7,7 @@ const {INT, data} = require('../../../runtime/data');
 
 /**
  * Cage.encaged.encage.
- * @return {Object} - Cage.encaged.encage object
+ * @returns {object} - Cage.encaged.encage object
  */
 const cage$encaged$encage = function() {
   const obj = object('cage$encaged$encage')
diff --git "a/eo2js-runtime/src/objects/org/eolang/cage$encaged$\317\206.js" "b/eo2js-runtime/src/objects/org/eolang/cage$encaged$\317\206.js"
index 337f0c5..7003efb 100644
--- "a/eo2js-runtime/src/objects/org/eolang/cage$encaged$\317\206.js"
+++ "b/eo2js-runtime/src/objects/org/eolang/cage$encaged$\317\206.js"
@@ -7,7 +7,7 @@ const cages = require('../../../runtime/cages');
 
 /**
  * Cage.encaged.φ.
- * @return {Object} - Cage.encaged.φ object
+ * @returns {object} - Cage.encaged.φ object
  */
 const cage$encaged$φ = function() {
   const obj = object('cage$encaged$φ')
diff --git "a/eo2js-runtime/src/objects/org/eolang/cage$\317\206.js" "b/eo2js-runtime/src/objects/org/eolang/cage$\317\206.js"
index e09e173..bbe8efc 100644
--- "a/eo2js-runtime/src/objects/org/eolang/cage$\317\206.js"
+++ "b/eo2js-runtime/src/objects/org/eolang/cage$\317\206.js"
@@ -5,7 +5,7 @@ const cages = require('../../../runtime/cages');
 
 /**
  * Cage.φ.
- * @return {Object} - Cage.φ object
+ * @returns {object} - Cage.φ object
  */
 const cage$φ = function() {
   const obj = object('cage$φ')
diff --git a/eo2js-runtime/src/objects/org/eolang/dataized.js b/eo2js-runtime/src/objects/org/eolang/dataized.js
index 011bcf4..e8dff89 100644
--- a/eo2js-runtime/src/objects/org/eolang/dataized.js
+++ b/eo2js-runtime/src/objects/org/eolang/dataized.js
@@ -6,7 +6,7 @@ const {data} = require('../../../runtime/data');
 
 /**
  * Dataized.
- * @return {Object} - Dataized object
+ * @returns {object} - Dataized object
  */
 const _dataized = function() {
   const obj = object('dataized')
diff --git a/eo2js-runtime/src/objects/org/eolang/error.js b/eo2js-runtime/src/objects/org/eolang/error.js
index 798973d..96581d4 100644
--- a/eo2js-runtime/src/objects/org/eolang/error.js
+++ b/eo2js-runtime/src/objects/org/eolang/error.js
@@ -7,9 +7,9 @@ const ErError = require('../../../runtime/error/ErError');
  * Error.
  * You are NOT supposed to use this object programmatically. It is only
  * used from EO, but not from JS. From JS, you just throw
- * {@link ErFailure}. It will be properly caught and converted to the error.
+ * {@see ErFailure}. It will be properly caught and converted to the error.
  * Again, DON'T USE THIS OBJECT PROGRAMMATICALLY.
- * @return {Object} - Error object
+ * @returns {object} - Error object
  */
 const error = function() {
   const obj = object('error')
diff --git a/eo2js-runtime/src/objects/org/eolang/float$div.js b/eo2js-runtime/src/objects/org/eolang/float$div.js
index 5f33fe0..b3faa02 100644
--- a/eo2js-runtime/src/objects/org/eolang/float$div.js
+++ b/eo2js-runtime/src/objects/org/eolang/float$div.js
@@ -6,7 +6,7 @@ const at_void = require('../../../runtime/attribute/at-void')
 
 /**
  * Float.div.
- * @return {any} - Float.div object
+ * @returns {any} - Float.div object
  */
 const float$div = function() {
   const obj = object('float$div')
diff --git a/eo2js-runtime/src/objects/org/eolang/float$gt.js b/eo2js-runtime/src/objects/org/eolang/float$gt.js
index 71fb694..36e9998 100644
--- a/eo2js-runtime/src/objects/org/eolang/float$gt.js
+++ b/eo2js-runtime/src/objects/org/eolang/float$gt.js
@@ -6,7 +6,7 @@ const at_void = require('../../../runtime/attribute/at-void')
 
 /**
  * Float.gt.
- * @return {any} - Float.gt object
+ * @returns {any} - Float.gt object
  */
 const float$gt = function() {
   const obj = object('float$gt')
diff --git a/eo2js-runtime/src/objects/org/eolang/float$plus.js b/eo2js-runtime/src/objects/org/eolang/float$plus.js
index 8c18d12..ea2671b 100644
--- a/eo2js-runtime/src/objects/org/eolang/float$plus.js
+++ b/eo2js-runtime/src/objects/org/eolang/float$plus.js
@@ -6,7 +6,7 @@ const at_void = require('../../../runtime/attribute/at-void')
 
 /**
  * Float.plus.
- * @return {any} - Int.plus object
+ * @returns {any} - Int.plus object
  */
 const float$plus = function() {
   const obj = object('float$plus')
diff --git a/eo2js-runtime/src/objects/org/eolang/float$times.js b/eo2js-runtime/src/objects/org/eolang/float$times.js
index a722432..0c555e9 100644
--- a/eo2js-runtime/src/objects/org/eolang/float$times.js
+++ b/eo2js-runtime/src/objects/org/eolang/float$times.js
@@ -6,7 +6,7 @@ const at_void = require('../../../runtime/attribute/at-void')
 
 /**
  * Float.times.
- * @return {any} - Float.times object
+ * @returns {any} - Float.times object
  */
 const float$times = function() {
   const obj = object('float$times')
diff --git a/eo2js-runtime/src/objects/org/eolang/int$div.js b/eo2js-runtime/src/objects/org/eolang/int$div.js
index b35bd10..ac44a58 100644
--- a/eo2js-runtime/src/objects/org/eolang/int$div.js
+++ b/eo2js-runtime/src/objects/org/eolang/int$div.js
@@ -7,7 +7,7 @@ const ErFailure = require('../../../runtime/error/ErFailure');
 
 /**
  * Int.div.
- * @return {any} - Int.div object
+ * @returns {any} - Int.div object
  */
 const int$div = function() {
   const obj = object('int$div')
diff --git a/eo2js-runtime/src/objects/org/eolang/int$gt.js b/eo2js-runtime/src/objects/org/eolang/int$gt.js
index 60f0662..42c64ce 100644
--- a/eo2js-runtime/src/objects/org/eolang/int$gt.js
+++ b/eo2js-runtime/src/objects/org/eolang/int$gt.js
@@ -6,7 +6,7 @@ const at_void = require('../../../runtime/attribute/at-void')
 
 /**
  * Int.gt.
- * @return {any} - Int.gt object
+ * @returns {any} - Int.gt object
  */
 const int$gt = function() {
   const obj = object('int$gt')
diff --git a/eo2js-runtime/src/objects/org/eolang/int$plus.js b/eo2js-runtime/src/objects/org/eolang/int$plus.js
index deefe62..bdb2632 100644
--- a/eo2js-runtime/src/objects/org/eolang/int$plus.js
+++ b/eo2js-runtime/src/objects/org/eolang/int$plus.js
@@ -6,7 +6,7 @@ const at_void = require('../../../runtime/attribute/at-void')
 
 /**
  * Int.plus.
- * @return {any} - Int.plus object
+ * @returns {any} - Int.plus object
  */
 const int$plus = function() {
   const obj = object('int$plus')
diff --git a/eo2js-runtime/src/objects/org/eolang/int$times.js b/eo2js-runtime/src/objects/org/eolang/int$times.js
index 56c8d6f..124127b 100644
--- a/eo2js-runtime/src/objects/org/eolang/int$times.js
+++ b/eo2js-runtime/src/objects/org/eolang/int$times.js
@@ -6,7 +6,7 @@ const at_void = require('../../../runtime/attribute/at-void')
 
 /**
  * Int.times.
- * @return {any} - Int.times object
+ * @returns {any} - Int.times object
  */
 const int$times = function() {
   const obj = object('int$times')
diff --git a/eo2js-runtime/src/objects/org/eolang/io/stdin$next-line.js b/eo2js-runtime/src/objects/org/eolang/io/stdin$next-line.js
index 38b38c9..d8a678f 100644
--- a/eo2js-runtime/src/objects/org/eolang/io/stdin$next-line.js
+++ b/eo2js-runtime/src/objects/org/eolang/io/stdin$next-line.js
@@ -4,14 +4,14 @@ const ErFailure = require('../../../../runtime/error/ErFailure');
 
 /**
  * Stdin.next_line.
- * @return {Object} - Stdin.next_line object
+ * @returns {object} - Stdin.next_line object
  * @todo #3:30min Implement stdin$next_line atom. We need to implement the atom and make sure it
  *  works. For the details of implementation check the Java analogue on
  *  https://github.com/objectionary/eo/tree/master/eo-runtime/src/main/java/EOorg/EOeolang
  */
 const stdin$next_line = function() {
   const obj = object('stdin$next_line')
-  obj.assets[LAMBDA] = function(_) {
+  obj.assets[LAMBDA] = function() {
     throw new ErFailure(
       `Atom stdin$next_line is not implemented yet`
     )
diff --git "a/eo2js-runtime/src/objects/org/eolang/io/stdin$\317\206.js" "b/eo2js-runtime/src/objects/org/eolang/io/stdin$\317\206.js"
index e02dc2c..4d2319d 100644
--- "a/eo2js-runtime/src/objects/org/eolang/io/stdin$\317\206.js"
+++ "b/eo2js-runtime/src/objects/org/eolang/io/stdin$\317\206.js"
@@ -4,7 +4,7 @@ const ErFailure = require('../../../../runtime/error/ErFailure');
 
 /**
  * Stdin.φ.
- * @return {Object} - Stdin.φ object
+ * @returns {object} - Stdin.φ object
  * @todo #3:30min Implement stdin$φ atom. We need to implement the atom and make sure it
  *  works. For the details of implementation check the Java analogue on
  *  https://github.com/objectionary/eo/tree/master/eo-runtime/src/main/java/EOorg/EOeolang
diff --git a/eo2js-runtime/src/objects/org/eolang/io/stdout.js b/eo2js-runtime/src/objects/org/eolang/io/stdout.js
index 43aa124..c774b4e 100644
--- a/eo2js-runtime/src/objects/org/eolang/io/stdout.js
+++ b/eo2js-runtime/src/objects/org/eolang/io/stdout.js
@@ -7,7 +7,7 @@ const at_void = require('../../../../runtime/attribute/at-void');
 /**
  * Stdout.
  * @param {{log: (function(...args: any): void)}} out - Out
- * @return {any} - Stdout object
+ * @returns {any} - Stdout object
  */
 const stdout = function(out = console) {
   const obj = object('stdout')
diff --git a/eo2js-runtime/src/objects/org/eolang/malloc$of$allocated$read.js b/eo2js-runtime/src/objects/org/eolang/malloc$of$allocated$read.js
index ee7aaac..9c8a3e2 100644
--- a/eo2js-runtime/src/objects/org/eolang/malloc$of$allocated$read.js
+++ b/eo2js-runtime/src/objects/org/eolang/malloc$of$allocated$read.js
@@ -7,7 +7,7 @@ const heaps = require('../../../runtime/heaps');
 
 /**
  * Malloc.of.allocated.read.
- * @return {Object} - Malloc.of.allocated.read object
+ * @returns {object} - Malloc.of.allocated.read object
  */
 const malloc$of$allocated$read = function() {
   const obj = object('malloc$of$allocated$read')
diff --git a/eo2js-runtime/src/objects/org/eolang/malloc$of$allocated$write.js b/eo2js-runtime/src/objects/org/eolang/malloc$of$allocated$write.js
index 99f5d05..61ed643 100644
--- a/eo2js-runtime/src/objects/org/eolang/malloc$of$allocated$write.js
+++ b/eo2js-runtime/src/objects/org/eolang/malloc$of$allocated$write.js
@@ -7,7 +7,7 @@ const dataized = require('../../../runtime/dataized');
 
 /**
  * Malloc.of.allocated.write.
- * @return {Object} - Malloc.of.allocated.write object
+ * @returns {object} - Malloc.of.allocated.write object
  */
 const malloc$of$allocated$write = function() {
   const obj = object('malloc$of$allocated$write')
diff --git "a/eo2js-runtime/src/objects/org/eolang/malloc$of$\317\206.js" "b/eo2js-runtime/src/objects/org/eolang/malloc$of$\317\206.js"
index a0059b4..da6bba4 100644
--- "a/eo2js-runtime/src/objects/org/eolang/malloc$of$\317\206.js"
+++ "b/eo2js-runtime/src/objects/org/eolang/malloc$of$\317\206.js"
@@ -6,7 +6,7 @@ const heaps = require('../../../runtime/heaps');
 
 /**
  * Malloc.of.φ.
- * @return {Object} - Malloc.of.φ object
+ * @returns {object} - Malloc.of.φ object
  */
 const malloc$of$φ = function() {
   const obj = object('malloc$of$φ')
diff --git a/eo2js-runtime/src/objects/org/eolang/rust.js b/eo2js-runtime/src/objects/org/eolang/rust.js
index 1507c28..d592e3e 100644
--- a/eo2js-runtime/src/objects/org/eolang/rust.js
+++ b/eo2js-runtime/src/objects/org/eolang/rust.js
@@ -4,7 +4,7 @@ const ErFailure = require('../../../runtime/error/ErFailure');
 
 /**
  * Rust.
- * @return {Object} - Rust object
+ * @returns {object} - Rust object
  * @todo #3:30min Implement rust atom. We need to implement the atom and make sure it
  *  works. For the details of implementation check the Java analogue on
  *  https://github.com/objectionary/eo/tree/master/eo-runtime/src/main/java/EOorg/EOeolang
diff --git a/eo2js-runtime/src/objects/org/eolang/seq.js b/eo2js-runtime/src/objects/org/eolang/seq.js
index 09cbd17..55bc964 100644
--- a/eo2js-runtime/src/objects/org/eolang/seq.js
+++ b/eo2js-runtime/src/objects/org/eolang/seq.js
@@ -7,8 +7,8 @@ const taken = require('../../../runtime/taken');
 
 /**
  * Extract element from EO tuple and convert them to JS array.
- * @param {Object} tuple - EO tuple object
- * @return {Object[]} - Array of EO tuple elements.
+ * @param {object} tuple - EO tuple object
+ * @returns {object[]} - Array of EO tuple elements.
  */
 const tupleAsArray = function(tuple) {
   const length = Number(dataized(tuple.take('length'), INT))
@@ -23,7 +23,7 @@ const tupleAsArray = function(tuple) {
 
 /**
  * Seq.
- * @return {Object} - Seq object
+ * @returns {object} - Seq object
  */
 const seq = function() {
   const obj = object('seq')
diff --git a/eo2js-runtime/src/objects/org/eolang/string$length.js b/eo2js-runtime/src/objects/org/eolang/string$length.js
index 5f0264d..1318eb8 100644
--- a/eo2js-runtime/src/objects/org/eolang/string$length.js
+++ b/eo2js-runtime/src/objects/org/eolang/string$length.js
@@ -5,7 +5,7 @@ const dataized = require('../../../runtime/dataized');
 
 /**
  * String.length.
- * @return {Object} - String.length object
+ * @returns {object} - String.length object
  */
 const string$length = function() {
   const obj = object('string$length')
diff --git a/eo2js-runtime/src/objects/org/eolang/string$slice.js b/eo2js-runtime/src/objects/org/eolang/string$slice.js
index 9c177da..d310d0c 100644
--- a/eo2js-runtime/src/objects/org/eolang/string$slice.js
+++ b/eo2js-runtime/src/objects/org/eolang/string$slice.js
@@ -7,7 +7,7 @@ const ErFailure = require('../../../runtime/error/ErFailure');
 
 /**
  * String.slice.
- * @return {Object} - String.slice object
+ * @returns {object} - String.slice object
  */
 const string$slice = function() {
   const obj = object('string$slice')
diff --git a/eo2js-runtime/src/objects/org/eolang/try.js b/eo2js-runtime/src/objects/org/eolang/try.js
index eabc711..dc61d01 100644
--- a/eo2js-runtime/src/objects/org/eolang/try.js
+++ b/eo2js-runtime/src/objects/org/eolang/try.js
@@ -7,7 +7,7 @@ const trapped = require('../../../runtime/trapped');
 
 /**
  * Try.
- * @return {Object} - Try object
+ * @returns {object} - Try object
  */
 const _try = function() {
   const obj = object('try')
diff --git a/eo2js-runtime/src/runtime/applied.js b/eo2js-runtime/src/runtime/applied.js
index 45f75e0..5f11a76 100644
--- a/eo2js-runtime/src/runtime/applied.js
+++ b/eo2js-runtime/src/runtime/applied.js
@@ -2,9 +2,9 @@ const once = require('./once');
 
 /**
  * Object with applied bindings lazily.
- * @param {Object} object - Object to apply bindings to
- * @param {Object} bindings - Bindings to apply
- * @return {Object} - Object with applied bindings
+ * @param {object} object - Object to apply bindings to
+ * @param {object} bindings - Bindings to apply
+ * @returns {object} - Object with applied bindings
  */
 const applied = function(object, bindings) {
   return once(
diff --git a/eo2js-runtime/src/runtime/attribute/at-lambda.js b/eo2js-runtime/src/runtime/attribute/at-lambda.js
index c2b3b22..9d519be 100644
--- a/eo2js-runtime/src/runtime/attribute/at-lambda.js
+++ b/eo2js-runtime/src/runtime/attribute/at-lambda.js
@@ -5,8 +5,8 @@ const {LAMBDA} = require('./specials');
 /**
  * Lazy lambda attribute.
  * @param {object} object - Rho
- * @param {function(self: object): object} callback - Lambda to call
- * @return {Object} Lazy lambda attribute
+ * @param {(self: object) => object} callback - Lambda to call
+ * @returns {object} Lazy lambda attribute
  */
 const at_lambda = function(object, callback) {
   return {
diff --git a/eo2js-runtime/src/runtime/attribute/at-once.js b/eo2js-runtime/src/runtime/attribute/at-once.js
index 124270c..350a4c7 100644
--- a/eo2js-runtime/src/runtime/attribute/at-once.js
+++ b/eo2js-runtime/src/runtime/attribute/at-once.js
@@ -2,7 +2,7 @@
  * Attribute that caches result after get.
  * Resets cache on copying.
  * @param {object} origin - Original attribute
- * @return {Object} - Attribute
+ * @returns {object} - Attribute
  */
 const at_once = function(origin) {
   const cache = {
diff --git a/eo2js-runtime/src/runtime/attribute/at-rho.js b/eo2js-runtime/src/runtime/attribute/at-rho.js
index 199fc54..02af60a 100644
--- a/eo2js-runtime/src/runtime/attribute/at-rho.js
+++ b/eo2js-runtime/src/runtime/attribute/at-rho.js
@@ -4,8 +4,8 @@ const at_term = require('./at-term');
 
 /**
  * Attribute that keeps \rho.
- * @param {Object} [object] - Rho object
- * @return {Object} - Rho attribute
+ * @param {object} [object] - Rho object
+ * @returns {object} - Rho attribute
  */
 const at_rho = function(object = null) {
   let rho = object
diff --git a/eo2js-runtime/src/runtime/attribute/at-safe.js b/eo2js-runtime/src/runtime/attribute/at-safe.js
index af06a86..9f27ec8 100644
--- a/eo2js-runtime/src/runtime/attribute/at-safe.js
+++ b/eo2js-runtime/src/runtime/attribute/at-safe.js
@@ -3,9 +3,9 @@ const safe = require('../safe');
 const at_term = require('./at-term');
 
 /**
- * Attribute that catches {@link ErFailure} and throws {@link ErError}.
+ * Attribute that catches {@see ErFailure} and throws {@see ErError}.
  * @param {object} origin - Original attribute
- * @return {Object} - Attribute
+ * @returns {object} - Attribute
  */
 const at_safe = function(origin) {
   return at_term({
diff --git a/eo2js-runtime/src/runtime/attribute/at-simple.js b/eo2js-runtime/src/runtime/attribute/at-simple.js
index a716107..2430d67 100644
--- a/eo2js-runtime/src/runtime/attribute/at-simple.js
+++ b/eo2js-runtime/src/runtime/attribute/at-simple.js
@@ -4,7 +4,7 @@ const at_once = require('./at-once');
 /**
  * Simple attribute.
  * @param {object} object - Object ot return
- * @return {Object} - Simple attribute
+ * @returns {object} - Simple attribute
  */
 const at_simple = function(object) {
   return at_once(
diff --git a/eo2js-runtime/src/runtime/attribute/at-term.js b/eo2js-runtime/src/runtime/attribute/at-term.js
index a4c7f06..01de689 100644
--- a/eo2js-runtime/src/runtime/attribute/at-term.js
+++ b/eo2js-runtime/src/runtime/attribute/at-term.js
@@ -1,7 +1,7 @@
 /**
  * Attribute as φTerm.
- * @param {Object} origin - Original attribute
- * @return {Object} - Attribute with default φTerm
+ * @param {object} origin - Original attribute
+ * @returns {object} - Attribute with default φTerm
  */
 const at_term = function(origin) {
   return {
diff --git a/eo2js-runtime/src/runtime/attribute/at-void.js b/eo2js-runtime/src/runtime/attribute/at-void.js
index d7b233a..8ecb76b 100644
--- a/eo2js-runtime/src/runtime/attribute/at-void.js
+++ b/eo2js-runtime/src/runtime/attribute/at-void.js
@@ -4,8 +4,8 @@ const {EMPTY} = require('./specials');
 /**
  * Void attribute.
  * @param {string} name - Name of the attribute
- * @param {Object} object - Object
- * @return {Object} - Free attribute
+ * @param {object} object - Object
+ * @returns {object} - Free attribute
  */
 const at_void = function(name, object = null) {
   let obj = object
diff --git a/eo2js-runtime/src/runtime/attribute/attr.js b/eo2js-runtime/src/runtime/attribute/attr.js
index 4d28938..de0aff8 100644
--- a/eo2js-runtime/src/runtime/attribute/attr.js
+++ b/eo2js-runtime/src/runtime/attribute/attr.js
@@ -5,7 +5,12 @@ const lambda = require('./at-lambda')
 
 /**
  * API for attributes.
- * @type {{lambda: (function(Object, function(Object): Object): *)|{}, void: (function(string): *)|{}, once: (function(Object): *)|{}, simple: (function(Object): *)|{}}}
+ * @type {{
+ *  lambda: (object: object, callback: (object) => object) => any,
+ *  void: (string) => any,
+ *  once: (object) => any,
+ *  simple: (object) => any
+ * }}
  */
 const attr = {
   once,
diff --git a/eo2js-runtime/src/runtime/bytes-of.js b/eo2js-runtime/src/runtime/bytes-of.js
index 6f926e4..a331ec8 100644
--- a/eo2js-runtime/src/runtime/bytes-of.js
+++ b/eo2js-runtime/src/runtime/bytes-of.js
@@ -12,8 +12,8 @@ const BYTE_SIZE = 8
  * to this:
  * [0, 0, 0, 0, 0, 0, 48, 57]
  * If int byte array is provided - return it
- * @param {array.<string>|array.<number>} bytes - Byte array
- * @return {array.<number>} - Int byte array
+ * @param {Array.<string>|Array.<number>} bytes - Byte array
+ * @returns {Array.<number>} - Int byte array
  */
 const hexToInt = function(bytes) {
   let byte
@@ -34,8 +34,8 @@ const hexToInt = function(bytes) {
 /**
  * Adjust byte array for numbers.
  * This is temporary solution that may fail at any moment. Should be removed as soon as possible.
- * @param {Array.<Number>} bytes - Byte array
- * @return {Array.<Number>} - Adjusted byte array
+ * @param {Array.<number>} bytes - Byte array
+ * @returns {Array.<number>} - Adjusted byte array
  */
 const adjustNumber = function(bytes) {
   if (bytes.length === 8) {
@@ -54,23 +54,23 @@ const adjustNumber = function(bytes) {
 
 /**
  * Bytes of.
- * @param {string|number|BigInt|boolean|array.<string>|array.<number>} data - Data to cast to bytes
- * @return {{
- *  asInt: (function(): BigInt),
- *  asBool: (function(): boolean),
- *  asString: (function(): string),
- *  asFloat: (function(): number),
- *  asBytes: (function(): array.<number>),
- *  verbose: (function(): string),
- *  and: (function(other: Array.<Number>): object),
- *  or: (function(other: Array.<Number>): object),
- *  xor: (function(other: Array.<Number>): object),
- *  not: (function(): object),
- *  shift: (function(Number): object)
+ * @param {string|number|bigint|boolean|Array.<string>|Array.<number>} data - Data to cast to bytes
+ * @returns {{
+ *  asInt: () => bigint,
+ *  asBool: () => boolean,
+ *  asString: () => string,
+ *  asFloat: () => number,
+ *  asBytes: () => Array.<number>,
+ *  verbose: () => string,
+ *  and: (other: Array.<number>) => object,
+ *  or: (other: Array.<number>) => object,
+ *  xor: (other: Array.<number>) => object,
+ *  not: () => object,
+ *  shift: (number) => object
  * }} - Bytes converter
  * @todo #3:30min Fix bytes converting for integers. There are some differences between how Java
  *  generate byte array from integers and JS. For example we get the number -18 in XMIR as
- *  ['0xFF', '0xFF', '0xFF', '0xFF', '0xFF', '0xFF', '0xFF', '0xEE'] byte array. After it cast from
+ *  ['0xFF', '0xFF', '0xFF', '0xFF', '0xFF', '0xFF', '0xFF', '0xEE'] byte Array. After it cast from
  *  hex to int it looks like: [255, 255, 255, 255, 255, 255, 255, 238]. But when we do
  *  {@code bytesOf(-18).asBytes()} we get [-1, -1, -1,  -1, -1, -1, -1, -72]. Technically - these
  *  arrays are the same because they'll converted to the same integer value -18. But at the level of
@@ -101,14 +101,14 @@ const bytesOf = function(data) {
   return {
     /**
      * Get byte array.
-     * @return {Array.<Number>} - Byte array
+     * @returns {Array.<number>} - Byte array
      */
     asBytes: function() {
       return bytes
     },
     /**
      * Convert bytes to integer.
-     * @return {BigInt} - Integer number
+     * @returns {bigint} - Integer number
      */
     asInt: function() {
       if (bytes.length !== 8) {
@@ -118,7 +118,7 @@ const bytesOf = function(data) {
     },
     /**
      * Convert bytes to float.
-     * @return {number} - Float number
+     * @returns {number} - Float number
      */
     asFloat: function() {
       if (bytes.length !== 8) {
@@ -128,14 +128,14 @@ const bytesOf = function(data) {
     },
     /**
      * Convert bytes to string
-     * @return {string} - String number
+     * @returns {string} - String number
      */
     asString: function() {
       return Buffer.from(bytes).toString('utf-8')
     },
     /**
      * Convert bytes to bool.
-     * @return {boolean} - Boolean
+     * @returns {boolean} - Boolean
      */
     asBool: function() {
       if (bytes.length !== 1) {
@@ -145,7 +145,7 @@ const bytesOf = function(data) {
     },
     /**
      * Get verbose bytes string representation depends on its length
-     * @return {string} - Verbose string representation of bytes
+     * @returns {string} - Verbose string representation of bytes
      */
     verbose: function() {
       let str
@@ -168,20 +168,20 @@ const bytesOf = function(data) {
     },
     /**
      * Logical AND.
-     * @param {Array.<Number>} other - Other byte array
-     * @return {{
-     *  asInt: (function(): BigInt),
-     *  asBool: (function(): boolean),
-     *  asString: (function(): string),
-     *  asFloat: (function(): number),
-     *  asBytes: (function(): Array<number>),
-     *  verbose: (function(): string),
-     *  and: (function(Array.<Number>): Object),
-     *  or: (function(Array.<Number>): Object),
-     *  xor: (function(Array.<Number>): Object),
-     *  not: (function(): object),
-     *  shift: (function(Number): Object)
-     * }}
+     * @param {Array.<number>} other - Other byte array
+     * @returns {{
+     *  asInt: () => bigint,
+     *  asBool: () => boolean,
+     *  asString: () => string,
+     *  asFloat: () => number,
+     *  asBytes: () => Array.<number>,
+     *  verbose: () => string,
+     *  and: (other: Array.<number>) => object,
+     *  or: (other: Array.<number>) => object,
+     *  xor: (other: Array.<number>) => object,
+     *  not: () => object,
+     *  shift: (number) => object
+     * }} - Bytes after AND.
      */
     and: function(other) {
       const copy = bytes
@@ -192,20 +192,20 @@ const bytesOf = function(data) {
     },
     /**
      * Logical OR.
-     * @param {Array.<Number>} other - Other byte array
-     * @return {{
-     *  asInt: (function(): BigInt),
-     *  asBool: (function(): boolean),
-     *  asString: (function(): string),
-     *  asFloat: (function(): number),
-     *  asBytes: (function(): Array<number>),
-     *  verbose: (function(): string),
-     *  and: (function(Array.<Number>): Object),
-     *  or: (function(Array.<Number>): Object),
-     *  xor: (function(Array.<Number>): Object),
-     *  not: (function(): object),
-     *  shift: (function(Number): Object)
-     * }}
+     * @param {Array.<number>} other - Other byte array
+     * @returns {{
+     *  asInt: () => bigint,
+     *  asBool: () => boolean,
+     *  asString: () => string,
+     *  asFloat: () => number,
+     *  asBytes: () => Array.<number>,
+     *  verbose: () => string,
+     *  and: (other: Array.<number>) => object,
+     *  or: (other: Array.<number>) => object,
+     *  xor: (other: Array.<number>) => object,
+     *  not: () => object,
+     *  shift: (number) => object
+     * }} - Bytes after OR.
      */
     or: function(other) {
       const copy = bytes
@@ -216,20 +216,20 @@ const bytesOf = function(data) {
     },
     /**
      * XOR.
-     * @param {Array.<Number>} other - Other byte array
-     * @return {{
-     *  asInt: (function(): BigInt),
-     *  asBool: (function(): boolean),
-     *  asString: (function(): string),
-     *  asFloat: (function(): number),
-     *  asBytes: (function(): Array<number>),
-     *  verbose: (function(): string),
-     *  and: (function(Array.<Number>): Object),
-     *  or: (function(Array.<Number>): Object),
-     *  xor: (function(Array.<Number>): Object),
-     *  not: (function(): object),
-     *  shift: (function(Number): Object)
-     * }}
+     * @param {Array.<number>} other - Other byte array
+     * @returns {{
+     *  asInt: () => bigint,
+     *  asBool: () => boolean,
+     *  asString: () => string,
+     *  asFloat: () => number,
+     *  asBytes: () => Array.<number>,
+     *  verbose: () => string,
+     *  and: (other: Array.<number>) => object,
+     *  or: (other: Array.<number>) => object,
+     *  xor: (other: Array.<number>) => object,
+     *  not: () => object,
+     *  shift: (number) => object
+     * }} - Bytes after XOR.
      */
     xor: function(other) {
       const copy = bytes
@@ -240,19 +240,19 @@ const bytesOf = function(data) {
     },
     /**
      * Logical NOT.
-     * @return {{
-     *  asInt: (function(): BigInt),
-     *  asBool: (function(): boolean),
-     *  asString: (function(): string),
-     *  asFloat: (function(): number),
-     *  asBytes: (function(): Array<number>),
-     *  verbose: (function(): string),
-     *  and: (function(Array.<Number>): Object),
-     *  or: (function(Array.<Number>): Object),
-     *  xor: (function(Array.<Number>): Object),
-     *  not: (function(): object),
-     *  shift: (function(Number): Object)
-     * }}
+     * @returns {{
+     *  asInt: () => bigint,
+     *  asBool: () => boolean,
+     *  asString: () => string,
+     *  asFloat: () => number,
+     *  asBytes: () => Array.<number>,
+     *  verbose: () => string,
+     *  and: (other: Array.<number>) => object,
+     *  or: (other: Array.<number>) => object,
+     *  xor: (other: Array.<number>) => object,
+     *  not: () => object,
+     *  shift: (number) => object
+     * }} - Bytes after negation.
      */
     not: function() {
       const copy = bytes
@@ -265,20 +265,20 @@ const bytesOf = function(data) {
      * Big-endian unsigned shift.
      * Shifts left if value is positive, or right otherwise.
      * Does not perform sign extension.
-     * @param {Number} bits - Bits amount
-     * @return {{
-     *  asInt: (function(): BigInt),
-     *  asBool: (function(): boolean),
-     *  asString: (function(): string),
-     *  asFloat: (function(): number),
-     *  asBytes: (function(): Array<number>),
-     *  verbose: (function(): string),
-     *  and: (function(Array.<Number>): Object),
-     *  or: (function(Array.<Number>): Object),
-     *  xor: (function(Array.<Number>): Object),
-     *  not: (function(): object),
-     *  shift: (function(Number): Object)
-     * }}
+     * @param {number} bits - Bits amount
+     * @returns {{
+     *  asInt: () => bigint,
+     *  asBool: () => boolean,
+     *  asString: () => string,
+     *  asFloat: () => number,
+     *  asBytes: () => Array.<number>,
+     *  verbose: () => string,
+     *  and: (other: Array.<number>) => object,
+     *  or: (other: Array.<number>) => object,
+     *  xor: (other: Array.<number>) => object,
+     *  not: () => object,
+     *  shift: (number) => object
+     * }} - Bytes after shift.
      */
     shift: function(bits) {
       bits = Number(bits)
diff --git a/eo2js-runtime/src/runtime/cages.js b/eo2js-runtime/src/runtime/cages.js
index 2473f26..d93ad37 100644
--- a/eo2js-runtime/src/runtime/cages.js
+++ b/eo2js-runtime/src/runtime/cages.js
@@ -15,32 +15,32 @@ let locator = 0
 /**
  * Cages for objects
  * @type {{
- *  init: function(Object): number,
- *  encage: function(Number, Object),
- *  get: function(Number): Object
+ *  init: (object) => number,
+ *  encage: (number, object) => void,
+ *  get: (number) => object
  * }}
  */
 const cages = {
   /**
    * Encage object for the first time.
    * New locator will be generated.
-   * @param {Number} object
-   * @return {number}
+   * @param {number} object - Object to encage
+   * @returns {number} - Locator
    */
   init: function(object) {
     const loc = ++locator
-    if (!OBJECTS.hasOwnProperty(loc)) {
+    if (!Object.hasOwn(OBJECTS, loc)) {
       OBJECTS[loc] = object
     }
     return loc
   },
   /**
    * Encage object to the storage by locator.
-   * @param {Number} loc - Locator
-   * @param {Object} object - Object
+   * @param {number} loc - Locator
+   * @param {object} object - object
    */
   encage: function(loc, object) {
-    if (!OBJECTS.hasOwnProperty(loc)) {
+    if (!Object.hasOwn(OBJECTS, loc)) {
       throw new ErFailure(
         `Encaged object with locator ${loc} was not initialized, can't reencage, can't encage`
       )
@@ -56,13 +56,13 @@ const cages = {
   },
   /**
    * Retrieve object from storage by locator
-   * @param {Number} loc - Locator
-   * @return {Object}
+   * @param {number} loc - Locator
+   * @returns {object} - Object from storage
    */
   get: function(loc) {
-    if (!OBJECTS.hasOwnProperty(loc)) {
+    if (!Object.hasOwn(OBJECTS, loc)) {
       throw new ErFailure(
-        `Object with locator ${loc} is absent in cage, can't get`
+        `object with locator ${loc} is absent in cage, can't get`
       )
     }
     return OBJECTS[loc]
diff --git a/eo2js-runtime/src/runtime/data.js b/eo2js-runtime/src/runtime/data.js
index bd0ac88..7a2df98 100644
--- a/eo2js-runtime/src/runtime/data.js
+++ b/eo2js-runtime/src/runtime/data.js
@@ -3,7 +3,7 @@ const bytesOf = require('./bytes-of');
 
 /**
  * Data to object converter.
- * @type {{BYTES: string, FLOAT: string, BOOL: string, STRING: string, INT: string, toObject: (function(string|boolean|number|BigInt|array.<string>|array.<number>): object)}}
+ * @type {{BYTES: string, FLOAT: string, BOOL: string, STRING: string, INT: string, toObject: (function(string|boolean|number|bigint|Array.<string>|Array.<number>): object)}}
  */
 const data = {
   toObject: function(data) {
diff --git a/eo2js-runtime/src/runtime/dataized.js b/eo2js-runtime/src/runtime/dataized.js
index 3ea2df3..0bac9a8 100644
--- a/eo2js-runtime/src/runtime/dataized.js
+++ b/eo2js-runtime/src/runtime/dataized.js
@@ -6,7 +6,7 @@ const ErFailure = require('./error/ErFailure');
  * Dataized.
  * @param {object} object - Object to dataize
  * @param {string} [type] - Type to cast to
- * @return {string|number|BigInt|boolean|array.<number>} - Data
+ * @returns {string|number|bigint|boolean|Array.<number>} - Data
  */
 const dataized = function(object, type) {
   const bytes = bytesOf(object.data())
diff --git a/eo2js-runtime/src/runtime/error/ErAbstract.js b/eo2js-runtime/src/runtime/error/ErAbstract.js
index 5612586..472ecf5 100644
--- a/eo2js-runtime/src/runtime/error/ErAbstract.js
+++ b/eo2js-runtime/src/runtime/error/ErAbstract.js
@@ -4,7 +4,7 @@
 class ErAbstract extends Error {
   /**
    * Ctor.
-   * @param {String} message - Cause.
+   * @param {string} message - Cause.
    */
   constructor(message) {
     super(message)
diff --git a/eo2js-runtime/src/runtime/error/ErError.js b/eo2js-runtime/src/runtime/error/ErError.js
index 8ce18ef..99cb552 100644
--- a/eo2js-runtime/src/runtime/error/ErError.js
+++ b/eo2js-runtime/src/runtime/error/ErError.js
@@ -9,7 +9,7 @@ const bytesOf = require('../bytes-of');
 class ErError extends ErAbstract {
   /**
    * Ctor.
-   * @param {Object} enclosure - Enclosure inside the error
+   * @param {object} enclosure - Enclosure inside the error
    */
   constructor(enclosure) {
     super(ErError.safeMessage(enclosure))
@@ -19,15 +19,15 @@ class ErError extends ErAbstract {
 
   /**
    * Retrieve message from enclosure safely.
-   * @param {Object} enclosure - Enclosure inside the error
-   * @return {string}
+   * @param {object} enclosure - Enclosure inside the error
+   * @returns {string} - Safe message
    */
   static safeMessage(enclosure) {
     let result
     try {
       const raw = dataized(enclosure)
       result = `${enclosure.toString()}(${DELTA} = ${bytesOf(raw).verbose()})`
-    } catch (ex) {
+    } catch (_) { /* eslint-disable-line no-unused-vars */
       result = enclosure.toString();
     }
     return result
diff --git a/eo2js-runtime/src/runtime/error/ErFailure.js b/eo2js-runtime/src/runtime/error/ErFailure.js
index 9f43c88..da61cfa 100644
--- a/eo2js-runtime/src/runtime/error/ErFailure.js
+++ b/eo2js-runtime/src/runtime/error/ErFailure.js
@@ -6,7 +6,7 @@ const ErAbstract = require('./ErAbstract')
 class ErFailure extends ErAbstract {
   /**
    * Ctor.
-   * @param {String} message - Message
+   * @param {string} message - Message
    */
   constructor(message) {
     super(message);
diff --git a/eo2js-runtime/src/runtime/heaps.js b/eo2js-runtime/src/runtime/heaps.js
index 2be678f..77bc121 100644
--- a/eo2js-runtime/src/runtime/heaps.js
+++ b/eo2js-runtime/src/runtime/heaps.js
@@ -15,21 +15,21 @@ let identifier = 0
 /**
  * Dynamic memory.
  * @type {{
- *  malloc: function(Number): number,
- *  read: function(Number, Number, Number): Array.<Number>,
- *  free: function(Number),
- *  write: function(Number, Number, Array.<Number>)
+ *  malloc: (number) => number,
+ *  read: (number, number, number) => Array.<number>,
+ *  free: (number) => void,
+ *  write: (number, number, data: Array.<number>) => void
  * }}
  */
 const heaps = {
   /**
    * Allocate block in memory of given size.
-   * @param {Number} size - Size of the block to allocate
-   * @return {Number} - Identifier of allocated block
+   * @param {number} size - Size of the block to allocate
+   * @returns {number} - Identifier of allocated block
    */
   malloc: function(size) {
     const id = ++identifier
-    if (BLOCKS.hasOwnProperty(id)) {
+    if (Object.hasOwn(BLOCKS, id)) {
       throw new ErFailure(
         `Can't allocate block in memory with identifier ${id} because it's already allocated`
       )
@@ -39,12 +39,12 @@ const heaps = {
   },
   /**
    * Write given data to the block in memory by given identifier.
-   * @param {Number} id - Identifier
-   * @param {Number} offset - Offset
-   * @param {Array.<Number>} data - Data tto write
+   * @param {number} id - Identifier
+   * @param {number} offset - Offset
+   * @param {Array.<number>} data - Data tto write
    */
   write: function(id, offset, data) {
-    if (!BLOCKS.hasOwnProperty(id)) {
+    if (!Object.hasOwn(BLOCKS, id)) {
       throw new ErFailure(
         `Can't read a block in memory with identifier ${id} because it's not allocated`,
       )
@@ -72,13 +72,13 @@ const heaps = {
   },
   /**
    * Get data from the block in memory by identifier.
-   * @param {Number} id - Identifier
-   * @param {Number} offset - Offset
-   * @param {Number} length - Length
-   * @return {Array.<Number>} - Data from the block in memory
+   * @param {number} id - Identifier
+   * @param {number} offset - Offset
+   * @param {number} length - Length
+   * @returns {Array.<number>} - Data from the block in memory
    */
   read: function(id, offset, length) {
-    if (!BLOCKS.hasOwnProperty(id)) {
+    if (!Object.hasOwn(BLOCKS, id)) {
       throw new ErFailure(
         `Block in memory by identifier ${id} is not allocated, can't read`,
       );
@@ -93,10 +93,10 @@ const heaps = {
   },
   /**
    * Free the block in memory by identifier.
-   * @param {Number} id - Identifier of pointer
+   * @param {number} id - Identifier of pointer
    */
   free: function(id) {
-    if (!BLOCKS.hasOwnProperty(id)) {
+    if (!Object.hasOwn(BLOCKS, id)) {
       throw new ErFailure(
         `Can't free a block in memory with identifier ${id} because it's not allocated`,
       );
diff --git a/eo2js-runtime/src/runtime/object.js b/eo2js-runtime/src/runtime/object.js
index 4ce2d98..c32194c 100644
--- a/eo2js-runtime/src/runtime/object.js
+++ b/eo2js-runtime/src/runtime/object.js
@@ -14,8 +14,8 @@ let vertex = 0
 
 /**
  * Object.
- * @param {String} name - Name of the object
- * @return {object} Object
+ * @param {string} name - Name of the object
+ * @returns {object} Object
  */
 const object = function(name = 'object') {
   const vtx = ++vertex
@@ -30,7 +30,7 @@ const object = function(name = 'object') {
     assets: {},
     /**
      * Copy itself.
-     * @return {Object} - Copied object.
+     * @returns {object} - Copied object.
      */
     copy: function() {
       const copy = object(name)
@@ -46,8 +46,8 @@ const object = function(name = 'object') {
     },
     /**
      * Set attributes or {@see DELTA} asset to the object.
-     * @param {Object} bindings - Attribute bindings
-     * @return {Object} - Self with attached attributes
+     * @param {object} bindings - Attribute bindings
+     * @returns {object} - Self with attached attributes
      * @throws ErFailure - If something wrong with bindings
      */
     with: function(bindings) {
@@ -83,32 +83,32 @@ const object = function(name = 'object') {
     },
     /**
      * Retrieve object by attribute/asset name
-     * @param {String} name - Attribute/asset name
-     * @return {Object} - Retrieved attribute/asset by name
+     * @param {string} name - Attribute/asset name
+     * @returns {object} - Retrieved attribute/asset by name
      * @throws ErFailure - If something wrong with attribute/asset retrieving
      */
     take: function(name) {
       name = String(name)
       let object
-      if (name === RHO && !this.attrs.hasOwnProperty(RHO)) {
+      if (name === RHO && !Object.hasOwn(this.attrs, RHO)) {
         object = at_rho().get()
       } else if (name === LAMBDA) {
-        if (this.attrs.hasOwnProperty(LAMBDA)) {
+        if (Object.hasOwn(this.attrs, LAMBDA)) {
           throw new ErFailure(`'${LAMBDA}' can't be used as attribute, only as asset`)
         }
-        if (!this.assets.hasOwnProperty(LAMBDA)) {
+        if (!Object.hasOwn(this.assets, LAMBDA)) {
           throw new ErFailure(`Can't take '${LAMBDA}' asset because it's absent`)
         }
         object = validated(
           () => safe(with_rho(this.assets[LAMBDA](this), this, name))
         )
-      } else if (this.attrs.hasOwnProperty(name)) {
+      } else if (Object.hasOwn(this.attrs, name)) {
         object = validated(
           () => safe(with_rho(this.attrs[name].get(), this, name))
         )
-      } else if (this.attrs.hasOwnProperty(PHI)) {
+      } else if (Object.hasOwn(this.attrs, PHI)) {
         object = this.take(PHI).take(name)
-      } else if (this.assets.hasOwnProperty(LAMBDA)) {
+      } else if (Object.hasOwn(this.assets, LAMBDA)) {
         object = this.take(LAMBDA).take(name)
       } else {
         throw new ErFailure(`Can't find '${name}' attribute in '${this.toString()}'`)
@@ -117,15 +117,15 @@ const object = function(name = 'object') {
     },
     /**
      * Retrieve data from the object
-     * @return {Array.<Number>} - Data
+     * @returns {Array.<number>} - Data
      */
     data: function() {
       let data
-      if (this.assets.hasOwnProperty(DELTA)) {
+      if (Object.hasOwn(this.assets, DELTA)) {
         data = this.assets[DELTA]
-      } else if (this.assets.hasOwnProperty(LAMBDA)) {
+      } else if (Object.hasOwn(this.assets, LAMBDA)) {
         data = this.take(LAMBDA).data()
-      } else if (this.attrs.hasOwnProperty(PHI)) {
+      } else if (Object.hasOwn(this.attrs, PHI)) {
         data = this.take(PHI).data()
       } else {
         throw new ErFailure(`There's no data in the object ${this.toString()}, can't take it`)
@@ -134,14 +134,14 @@ const object = function(name = 'object') {
     },
     /**
      * Print itself.
-     * @return {String} - String representation of object
+     * @returns {string} - String representation of object
      */
     toString: function() {
       return `${name}ν${vtx}`
     },
     /**
      * Forma of itself.
-     * @return {String} - Forma
+     * @returns {string} - Forma
      * @todo #61:30min Make forma contained full FQN of the object. Now forma of the object is the
      *  last part of its FQN. For example, if object is 'org.eolang.int', it's forma is 'int' which
      *  is wrong, it should be 'org.eolang.int'. So we need to fix this naming and make sure
@@ -152,15 +152,15 @@ const object = function(name = 'object') {
     },
     /**
      * Represent self as φ term.
-     * @return {String} - Self as φ calculus term
+     * @returns {string} - Self as φ calculus term
      */
     φTerm: function() {
       const list = []
       const binding = (left, right) => `${left} ↦ ${right}`
-      if (this.assets.hasOwnProperty(DELTA)) {
+      if (Object.hasOwn(this.assets, DELTA)) {
         list.push(binding(DELTA, `[${this.assets[DELTA].join(', ')}]`))
       }
-      if (this.assets.hasOwnProperty(LAMBDA)) {
+      if (Object.hasOwn(this.assets, LAMBDA)) {
         list.push(binding(LAMBDA, 'Lambda'))
       }
       list.push(
diff --git a/eo2js-runtime/src/runtime/once.js b/eo2js-runtime/src/runtime/once.js
index 76ff7ef..0fe1628 100644
--- a/eo2js-runtime/src/runtime/once.js
+++ b/eo2js-runtime/src/runtime/once.js
@@ -1,7 +1,7 @@
 /**
  * Evaluate object lazily only once.
  * @param {function(): object} callback - Function to evaluate
- * @return {Object} - Lazily evaluated object
+ * @returns {object} - Lazily evaluated object
  */
 const once = function(callback) {
   let cached = null
diff --git a/eo2js-runtime/src/runtime/package.js b/eo2js-runtime/src/runtime/package.js
index c498111..d12c162 100644
--- a/eo2js-runtime/src/runtime/package.js
+++ b/eo2js-runtime/src/runtime/package.js
@@ -10,10 +10,10 @@ const with_rho = require('./with-rho');
 /**
  * Try to find an object by given directory and FQN.
  * Context "this" should be set to the object {@link pckg}.
- * @param {String} dir - Relative directory where object may be placed
- * @param {String} name - Name of the current object
- * @param {array.<String>} fqn - Parts of FQN of the object. E.g. ['org', 'eolang', 'int']
- * @return {Object|null} - Found object or null
+ * @param {string} dir - Relative directory where object may be placed
+ * @param {string} name - Name of the current object
+ * @param {Array.<string>} fqn - Parts of FQN of the object. E.g. ['org', 'eolang', 'int']
+ * @returns {object|null} - Found object or null
  */
 const tryFind = function(dir, name, fqn) {
   let obj = null
@@ -37,9 +37,9 @@ const tryFind = function(dir, name, fqn) {
  * we're in the "node_modules" directory (which means, that eo2js-runtime is used as
  * dependency). If so - tries to find object in main project directory.
  * Context "this" should be set to the object {@link pckg}.
- * @param {String} name - Name of the object
- * @param {String} full - FQN of the object
- * @return {Object} - Found object
+ * @param {string} name - Name of the object
+ * @param {string} full - FQN of the object
+ * @returns {object} - Found object
  */
 const found = function(name, full) {
   const split = full.split('.')
@@ -55,9 +55,9 @@ const found = function(name, full) {
 
 /**
  * Package object.
- * @param {String} fqn - FQN of package object
+ * @param {string} fqn - FQN of package object
  * @param {object} rho - Rho
- * @return {object} - Package object
+ * @returns {object} - Package object
  */
 const pckg = function(fqn, rho) {
   const obj = object(`Package '${fqn}'`)
@@ -74,7 +74,7 @@ const pckg = function(fqn, rho) {
   }
   obj.take = function(name) {
     let obj
-    if (this.attrs.hasOwnProperty(name)) {
+    if (Object.hasOwn(this.attrs, name)) {
       obj = with_rho(this.attrs[name].get(), this, name)
     } else if (!name.includes('.')) {
       const before = this.assets[LAMBDA](this)
diff --git a/eo2js-runtime/src/runtime/safe.js b/eo2js-runtime/src/runtime/safe.js
index b1d0041..f195e2e 100644
--- a/eo2js-runtime/src/runtime/safe.js
+++ b/eo2js-runtime/src/runtime/safe.js
@@ -2,10 +2,10 @@ const validated = require('./validated');
 const trapped = require('./trapped');
 
 /**
- * Object that catches {@link ErFailure} and
- * throws {@link ErError} in its 'take' and 'with' methods.
- * @param {Object} origin - Original object
- * @return {Object} - Safe object
+ * Object that catches {@see ErFailure} and
+ * throws {@see ErError} in its 'take' and 'with' methods.
+ * @param {object} origin - Original object
+ * @returns {object} - Safe object
  */
 const safe = function(origin) {
   return trapped(
diff --git a/eo2js-runtime/src/runtime/taken.js b/eo2js-runtime/src/runtime/taken.js
index 89c12f1..72c39da 100644
--- a/eo2js-runtime/src/runtime/taken.js
+++ b/eo2js-runtime/src/runtime/taken.js
@@ -2,9 +2,9 @@ const once = require('./once');
 
 /**
  * Lazily taken attribute from the object.
- * @param {Object} object - Object to take attribute from
- * @param {String} attribute - Attribute name to take
- * @return {Object} - Lazily taking attribute
+ * @param {object} object - Object to take attribute from
+ * @param {string} attribute - Attribute name to take
+ * @returns {object} - Lazily taking attribute
  */
 const taken = function(object, attribute) {
   return once(
diff --git a/eo2js-runtime/src/runtime/traced.js b/eo2js-runtime/src/runtime/traced.js
index 953c364..b7b922b 100644
--- a/eo2js-runtime/src/runtime/traced.js
+++ b/eo2js-runtime/src/runtime/traced.js
@@ -19,11 +19,11 @@ const DATAIZING_CAGES = {}
 
 /**
  * Increment counter of cage in the {@link DATAIZING_CAGES}.
- * @param {Number} locator - Locator of the cage
- * @param {Number} depth - Depth of cage recursion
+ * @param {number} locator - Locator of the cage
+ * @param {number} depth - Depth of cage recursion
  */
 const increment = function(locator, depth) {
-  if (!DATAIZING_CAGES.hasOwnProperty(locator)) {
+  if (!Object.hasOwn(DATAIZING_CAGES, locator)) {
     DATAIZING_CAGES[locator] = 1
   } else {
     DATAIZING_CAGES[locator] = DATAIZING_CAGES[locator] + 1
@@ -37,10 +37,10 @@ const increment = function(locator, depth) {
 
 /**
  * Decrement counter of cage in the {@link DATAIZING_CAGES}.
- * @param {Number} locator - Locator of the cage
+ * @param {number} locator - Locator of the cage
  */
 const decrement = function(locator) {
-  if (DATAIZING_CAGES.hasOwnProperty(locator)) {
+  if (Object.hasOwn(DATAIZING_CAGES, locator)) {
     const count = DATAIZING_CAGES[locator] - 1
     if (count === 0) {
       delete DATAIZING_CAGES[locator]
@@ -52,10 +52,10 @@ const decrement = function(locator) {
 
 /**
  * Object that traces if the "cage.new" got into recursion during the dataization.
- * @param {Object} object - Encaged object
- * @param {Number} locator - Locator of the object
- * @param {Number} depth - Max depth of cage recursion
- * @return {Object}
+ * @param {object} object - Encaged object
+ * @param {number} locator - Locator of the object
+ * @param {number} depth - Max depth of cage recursion
+ * @returns {object} - Traced object
  */
 const traced = function(object, locator, depth = RECURSION_THRESHOLD) {
   return trapped(
diff --git a/eo2js-runtime/src/runtime/trapped.js b/eo2js-runtime/src/runtime/trapped.js
index 7f936c3..aa766b3 100644
--- a/eo2js-runtime/src/runtime/trapped.js
+++ b/eo2js-runtime/src/runtime/trapped.js
@@ -1,8 +1,8 @@
 /**
  * Trap for the functions of the object.
  * @param {any} object - Object
- * @param {function(property: String, target: any, thisArg: any, args: any[]): any} apply - Function that overrides the default one
- * @return {Object} - Trapped object
+ * @param {(property: string, target: any, thisArg: any, args: any[]) => any} apply - Function that overrides the default one
+ * @returns {object} - Trapped object
  */
 const trapped = function(object, apply) {
   return new Proxy(
diff --git a/eo2js-runtime/src/runtime/validated.js b/eo2js-runtime/src/runtime/validated.js
index 9201f2c..a1cf37a 100644
--- a/eo2js-runtime/src/runtime/validated.js
+++ b/eo2js-runtime/src/runtime/validated.js
@@ -5,8 +5,8 @@ const {data} = require('./data');
 /**
  * Validate given callback.
  * If catches {@link ErFailure} - throws {@link ErError}.
- * @param {function(): Object} callback - Callback to validate
- * @return {Object} - Callback result
+ * @param {function(): object} callback - Callback to validate
+ * @returns {object} - Callback result
  */
 const validated = function(callback) {
   try {
diff --git a/eo2js-runtime/src/runtime/with-rho.js b/eo2js-runtime/src/runtime/with-rho.js
index 1c31db7..ec83fa0 100644
--- a/eo2js-runtime/src/runtime/with-rho.js
+++ b/eo2js-runtime/src/runtime/with-rho.js
@@ -3,14 +3,14 @@ const at_rho = require('./attribute/at-rho');
 
 /**
  * Set rho attribute to the object if it does not have one.
- * @param {Object} object - Object to set rho attribute to
- * @param {Object} rho - Rho object
- * @param {String} name - Name of the object as attribute
- * @return {Object} The same object if it already has rho attribute or new copy of the object with injected rho
+ * @param {object} object - Object to set rho attribute to
+ * @param {object} rho - Rho object
+ * @param {string} name - Name of the object as attribute
+ * @returns {object} The same object if it already has rho attribute or new copy of the object with injected rho
  */
 const with_rho = function(object, rho, name) {
   let obj = object
-  if (name !== RHO && !object.attrs.hasOwnProperty(RHO)) {
+  if (name !== RHO && !Object.hasOwn(object.attrs, RHO)) {
     obj = obj.copy()
     obj.attrs[RHO] = at_rho(rho)
   }
diff --git a/eo2js-runtime/test/fake/org/eolang/bytes.js b/eo2js-runtime/test/fake/org/eolang/bytes.js
index fd6655d..fe2bb0f 100644
--- a/eo2js-runtime/test/fake/org/eolang/bytes.js
+++ b/eo2js-runtime/test/fake/org/eolang/bytes.js
@@ -2,8 +2,7 @@
  * Fake bytes EO object that is used for the test purposes.
  * Don't change the file until you definitely know what you're doing.
  * For more information please read README.md in test/fake folder
- * @param {Object} sigma - Sigma
- * @return {Object} - Object
+ * @returns {object} - Object
  */
 const bytes = function() {
   const object = require('../../../runtime/object')
diff --git a/eo2js-runtime/test/fake/org/eolang/cage.js b/eo2js-runtime/test/fake/org/eolang/cage.js
index 9f2a117..dc9c7f0 100644
--- a/eo2js-runtime/test/fake/org/eolang/cage.js
+++ b/eo2js-runtime/test/fake/org/eolang/cage.js
@@ -2,7 +2,7 @@
  * Fake CAGE EO object that is used for the test purposes.
  * Don't change the file until you definitely know what you're doing.
  * For more information please read README.md in test/fake folder
- * @return {Object} - Object
+ * @returns {object} - Object
  */
 const cage = function() {
   const object = require('../../../runtime/object')
@@ -39,7 +39,7 @@ const cage = function() {
  * Fake CAGE.ENCAGED EO object that is used for the test purposes.
  * Don't change the file until you definitely know what you're doing.
  * For more information please read README.md in test/fake folder
- * @return {Object} - Object
+ * @returns {object} - Object
  */
 const cage$encaged = function() {
   const object = require('../../../runtime/object')
diff --git a/eo2js-runtime/test/fake/org/eolang/false.js b/eo2js-runtime/test/fake/org/eolang/false.js
index 4d6e915..054d7c9 100644
--- a/eo2js-runtime/test/fake/org/eolang/false.js
+++ b/eo2js-runtime/test/fake/org/eolang/false.js
@@ -2,7 +2,7 @@
  * Fake FALSE EO object that is used for the test purposes.
  * Don't change the file until you definitely know what you're doing.
  * For more information please read README.md in test/fake folder
- * @return {Object} - Object
+ * @returns {object} - Object
  */
 const _false = function() {
   const object = require('../../../runtime/object')
diff --git a/eo2js-runtime/test/fake/org/eolang/float.js b/eo2js-runtime/test/fake/org/eolang/float.js
index 447cacc..6aba437 100644
--- a/eo2js-runtime/test/fake/org/eolang/float.js
+++ b/eo2js-runtime/test/fake/org/eolang/float.js
@@ -2,7 +2,7 @@
  * Fake float EO object that is used for the test purposes.
  * Don't change the file until you definitely know what you're doing.
  * For more information please read README.md in test/fake folder
- * @return {Object} - Object
+ * @returns {object} - Object
  */
 const float = function() {
   const object = require('../../../runtime/object')
diff --git a/eo2js-runtime/test/fake/org/eolang/int.js b/eo2js-runtime/test/fake/org/eolang/int.js
index 2bd15c0..b24f0d7 100644
--- a/eo2js-runtime/test/fake/org/eolang/int.js
+++ b/eo2js-runtime/test/fake/org/eolang/int.js
@@ -2,7 +2,7 @@
  * Fake int EO object that is used for the test purposes.
  * Don't change the file until you definitely know what you're doing.
  * For more information please read README.md in test/fake folder
- * @return {Object} - Object
+ * @returns {object} - Object
  */
 const int = function() {
   const object = require('../../../runtime/object')
diff --git a/eo2js-runtime/test/fake/org/eolang/string.js b/eo2js-runtime/test/fake/org/eolang/string.js
index 6c5705c..7f8f804 100644
--- a/eo2js-runtime/test/fake/org/eolang/string.js
+++ b/eo2js-runtime/test/fake/org/eolang/string.js
@@ -2,7 +2,7 @@
  * Fake string EO object that is used for the test purposes.
  * Don't change the file until you definitely know what you're doing.
  * For more information please read README.md in test/fake folder
- * @return {Object} - Object
+ * @returns {object} - Object
  */
 const string = function() {
   const object = require('../../../runtime/object')
diff --git a/eo2js-runtime/test/fake/org/eolang/true.js b/eo2js-runtime/test/fake/org/eolang/true.js
index 38f49fb..fa3a6e5 100644
--- a/eo2js-runtime/test/fake/org/eolang/true.js
+++ b/eo2js-runtime/test/fake/org/eolang/true.js
@@ -2,7 +2,7 @@
  * Fake true EO object that is used for the test purposes.
  * Don't change the file until you definitely know what you're doing.
  * For more information please read README.md in test/fake folder
- * @return {Object} - Object
+ * @returns {object} - Object
  */
 const _true = function() {
   const object = require('../../../runtime/object')
diff --git a/eo2js-runtime/test/objects/org/eolang/cage.test.js b/eo2js-runtime/test/objects/org/eolang/cage.test.js
index 1aa19ce..1332eee 100644
--- a/eo2js-runtime/test/objects/org/eolang/cage.test.js
+++ b/eo2js-runtime/test/objects/org/eolang/cage.test.js
@@ -10,8 +10,8 @@ const {RECURSION_THRESHOLD} = require('../../../../src/runtime/traced');
 
 /**
  * Encaged object.
- * @param {Object} object - Object to encage
- * @return {Object} - Cage
+ * @param {object} object - Object to encage
+ * @returns {object} - Cage
  */
 const encaged = function(object) {
   return phi.take('org.eolang.cage').with({
@@ -21,8 +21,8 @@ const encaged = function(object) {
 
 /**
  * Encage given object to given cage.
- * @param {Object} cage - Cage
- * @param {Object} obj - Object to encage
+ * @param {object} cage - Cage
+ * @param {object} obj - Object to encage
  */
 const encageTo = function(cage, obj) {
   dataized(cage.take('encage').with({
@@ -32,8 +32,8 @@ const encageTo = function(cage, obj) {
 
 /**
  * Dummy object.
- * @param {Number} num
- * @return {Object} - Dummy object
+ * @param {number} num - Number
+ * @returns {object} - Dummy object
  */
 const dummy = function(num) {
   const obj = object('dummy')
@@ -43,9 +43,9 @@ const dummy = function(num) {
 
 /**
  * Recursive dummy.
- * @param {Object} cage - Cage
- * @param {Number} depth - Depth
- * @return {Object} - Recursive dummy
+ * @param {object} cage - Cage
+ * @param {number} depth - Depth
+ * @returns {object} - Recursive dummy
  */
 const recursiveDummy = function(cage, depth) {
   let counter = 0
diff --git a/eo2js-runtime/test/objects/org/eolang/try.test.js b/eo2js-runtime/test/objects/org/eolang/try.test.js
index ea5bb93..52ae7e7 100644
--- a/eo2js-runtime/test/objects/org/eolang/try.test.js
+++ b/eo2js-runtime/test/objects/org/eolang/try.test.js
@@ -17,8 +17,8 @@ const MESSAGE = 'something is broken'
 
 /**
  * Broken object that throws {@link ErFailure}.
- * @param {String} name - Name of the attribute or asset
- * @return {Object} - Broken
+ * @param {string} name - Name of the attribute or asset
+ * @returns {object} - Broken
  */
 const broken = function(name) {
   const obj = object('broken')
@@ -36,7 +36,7 @@ const broken = function(name) {
 
 /**
  * Not broken main object for try.
- * @return {Object} - Object
+ * @returns {object} - Object
  */
 const main = function() {
   const obj = object('main')
@@ -46,7 +46,7 @@ const main = function() {
 
 /**
  * Catcher.
- * @return {Object} - Catcher
+ * @returns {object} - Catcher
  */
 const catcher = function() {
   const obj = object('catcher')
@@ -57,7 +57,7 @@ const catcher = function() {
 
 /**
  * Nop.
- * @return {Object} - Nop
+ * @returns {object} - Nop
  */
 const nop = function() {
   const obj = object('nop')
@@ -67,9 +67,9 @@ const nop = function() {
 
 /**
  * Build try object.
- * @param {Object} main - Main attribute
- * @param {Object} [final] - Finally attribute
- * @return {Object} - Try object
+ * @param {object} main - Main attribute
+ * @param {object} [final] - Finally attribute
+ * @returns {object} - Try object
  */
 const tryObj = function(main, final) {
   return tr().with({
diff --git a/eo2js-runtime/test/regular.js b/eo2js-runtime/test/regular.js
new file mode 100644
index 0000000..cf41fbc
--- /dev/null
+++ b/eo2js-runtime/test/regular.js
@@ -0,0 +1,5 @@
+const assert = require('assert')
+
+it('', function() {
+  assert.ok(true)
+})
\ No newline at end of file
diff --git a/eo2js-runtime/test/runtime/data.test.js b/eo2js-runtime/test/runtime/data.test.js
index beee733..0bf7d8b 100644
--- a/eo2js-runtime/test/runtime/data.test.js
+++ b/eo2js-runtime/test/runtime/data.test.js
@@ -3,12 +3,15 @@ const {data, INT, STRING, FLOAT, BOOL} = require('../../temp/runtime/data')
 const dataized = require('../../temp/runtime/dataized');
 
 const isObject = function(obj) {
-  return obj.hasOwnProperty('attrs') &&
-    obj.hasOwnProperty('assets') &&
-    obj.hasOwnProperty('take') &&
-    obj.hasOwnProperty('copy') &&
-    obj.hasOwnProperty('with') &&
-    obj.hasOwnProperty('toString')
+  return Object.hasOwn(obj, 'attrs') &&
+    Object.hasOwn(obj, 'assets') &&
+    Object.hasOwn(obj, 'take') &&
+    Object.hasOwn(obj, 'copy') &&
+    Object.hasOwn(obj, 'with') &&
+    Object.hasOwn(obj, 'data') &&
+    Object.hasOwn(obj, 'forma') &&
+    Object.hasOwn(obj, 'φTerm') &&
+    Object.hasOwn(obj, 'toString')
 }
 
 describe('data', function() {
diff --git a/eo2js-runtime/test/runtime/object.test.js b/eo2js-runtime/test/runtime/object.test.js
index 86791b5..90291bb 100644
--- a/eo2js-runtime/test/runtime/object.test.js
+++ b/eo2js-runtime/test/runtime/object.test.js
@@ -10,7 +10,7 @@ const at_rho = require('../../temp/runtime/attribute/at-rho');
 
 describe('object', function() {
   it(`should not have ${RHO} attribute at the beginning`, function() {
-    assert.ok(!object().attrs.hasOwnProperty(RHO))
+    assert.ok(!(RHO in object().attrs))
   })
   it(`should have empty assets`, function() {
     assert.equal(Object.keys(object().assets).length, 0)
diff --git a/eo2js-runtime/test/runtime/package.test.js b/eo2js-runtime/test/runtime/package.test.js
index 90b9203..a3ee730 100644
--- a/eo2js-runtime/test/runtime/package.test.js
+++ b/eo2js-runtime/test/runtime/package.test.js
@@ -17,7 +17,7 @@ describe('package object', function() {
       assert.deepStrictEqual(phi.take('').take(RHO), phi)
     })
     it(`should have ${RHO} attribute`, function() {
-      assert.ok(pckg('', {}).attrs.hasOwnProperty(RHO))
+      assert.ok(RHO in pckg('', {}).attrs)
     })
     describe('#take()', function() {
       it('should return next level package object', function() {
@@ -90,7 +90,7 @@ describe('package object', function() {
   describe('"org"', function() {
     it(`should have ${RHO} attributes`, function() {
       const obj = pckg('', {}).take('org')
-      assert.ok(obj.attrs.hasOwnProperty(RHO))
+      assert.ok(RHO in obj.attrs)
     })
     describe('#with()', function() {
       it('should fail on put', function() {
diff --git a/eo2js/.eslintrc.json b/eo2js/.eslintrc.json
deleted file mode 100644
index 7c94be9..0000000
--- a/eo2js/.eslintrc.json
+++ /dev/null
@@ -1,16 +0,0 @@
-{
-  "env": {
-    "es6": true
-  },
-  "extends": "google",
-  "rules": {
-    "semi": "off",
-    "comma-dangle": "off",
-    "indent": [ "error", 2 ],
-    "camelcase": "off",
-    "max-len": [ "error", { "code": 300 } ]
-  },
-  "parserOptions": {
-    "ecmaVersion": 2019
-  }
-}
diff --git a/eo2js/Gruntfile.js b/eo2js/Gruntfile.js
index dc4d731..5fc390d 100644
--- a/eo2js/Gruntfile.js
+++ b/eo2js/Gruntfile.js
@@ -12,7 +12,7 @@ module.exports = function(grunt) {
     },
     eslint: {
       options: {
-        overrideConfigFile: '.eslintrc.json',
+        overrideConfigFile: 'eslint.config.js',
       },
       target: ['Gruntfile.js', 'src/**/*.js', 'test/**/*.js'],
     },
diff --git a/eo2js/eslint.config.js b/eo2js/eslint.config.js
new file mode 100644
index 0000000..2434ea1
--- /dev/null
+++ b/eo2js/eslint.config.js
@@ -0,0 +1,36 @@
+const js = require('@eslint/js')
+const jsdoc = require('eslint-plugin-jsdoc')
+const globals = require('globals')
+
+module.exports = [
+  js.configs.recommended,
+  jsdoc.configs['flat/recommended'],
+  {
+    plugins: {
+      jsdoc
+    },
+    files: ["**/*.js"],
+    rules: {
+      "jsdoc/require-description": "error",
+      "jsdoc/check-values": "error"
+    }
+  },
+  {
+    rules: {
+      semi: 'off',
+      'comma-dangle': 'off',
+      indent: ['error', 2],
+      camelcase: 'off',
+      'max-len': ['error', {'code': 300}],
+      'no-unused-vars': ['error', {argsIgnorePattern: '^_'}],
+    },
+    languageOptions: {
+      globals: {
+        ...globals.node,
+        ...globals.mocha,
+      },
+      ecmaVersion: 'latest',
+      sourceType: 'commonjs',
+    }
+  }
+]
\ No newline at end of file
diff --git a/eo2js/package-lock.json b/eo2js/package-lock.json
index 32a20b3..982aee2 100644
--- a/eo2js/package-lock.json
+++ b/eo2js/package-lock.json
@@ -19,12 +19,13 @@
       "devDependencies": {
         "eslint": "9.5.0",
         "eslint-config-google": "0.14.0",
+        "eslint-plugin-jsdoc": "^48.5.0",
         "grunt": "^1.6.1",
         "grunt-contrib-clean": "2.0.1",
-        "grunt-eslint": "24.3.0",
+        "grunt-eslint": "25.0.0",
         "grunt-mocha-cli": "^7.0.0",
         "jspath": "0.4.0",
-        "mocha": "^10.3.0",
+        "mocha": "^10.5.2",
         "xslt3": "^2.6.0"
       }
     },
@@ -37,6 +38,24 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/@es-joy/jsdoccomment": {
+      "version": "0.43.1",
+      "resolved": "https://registry.npmjs.org/@es-joy/jsdoccomment/-/jsdoccomment-0.43.1.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/eslint": "^8.56.5",
+        "@types/estree": "^1.0.5",
+        "@typescript-eslint/types": "^7.2.0",
+        "comment-parser": "1.4.1",
+        "esquery": "^1.5.0",
+        "jsdoc-type-pratt-parser": "~4.0.0"
+      },
+      "engines": {
+        "node": ">=16"
+      }
+    },
     "node_modules/@eslint-community/eslint-utils": {
       "version": "4.4.0",
       "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.4.0.tgz",
@@ -179,13 +198,6 @@
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-      "resolved": "https://registry.npmjs.org/@humanwhocodes/object-schema/-/object-schema-2.0.3.tgz",
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-      "dev": true,
-      "license": "BSD-3-Clause"
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@@ -235,6 +247,58 @@
         "node": ">= 8"
       }
     },
+    "node_modules/@pkgr/core": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/@pkgr/core/-/core-0.1.1.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
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+      },
+      "funding": {
+        "url": "https://opencollective.com/unts"
+      }
+    },
+    "node_modules/@types/eslint": {
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+      "resolved": "https://registry.npmjs.org/@types/eslint/-/eslint-8.56.10.tgz",
+      "integrity": "sha512-Shavhk87gCtY2fhXDctcfS3e6FdxWkCx1iUZ9eEUbh7rTqlZT0/IzOkCOVt0fCjcFuZ9FPYfuezTBImfHCDBGQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/estree": "*",
+        "@types/json-schema": "*"
+      }
+    },
+    "node_modules/@types/estree": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.5.tgz",
+      "integrity": "sha512-/kYRxGDLWzHOB7q+wtSUQlFrtcdUccpfy+X+9iMBpHK8QLLhx2wIPYuS5DYtR9Wa/YlZAbIovy7qVdB1Aq6Lyw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@types/json-schema": {
+      "version": "7.0.15",
+      "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.15.tgz",
+      "integrity": "sha512-5+fP8P8MFNC+AyZCDxrB2pkZFPGzqQWUzpSeuuVLvm8VMcorNYavBqoFcxK8bQz4Qsbn4oUEEem4wDLfcysGHA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@typescript-eslint/types": {
+      "version": "7.14.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-7.14.1.tgz",
+      "integrity": "sha512-mL7zNEOQybo5R3AavY+Am7KLv8BorIv7HCYS5rKoNZKQD9tsfGUpO4KdAn3sSUvTiS4PQkr2+K0KJbxj8H9NDg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^18.18.0 || >=20.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      }
+    },
     "node_modules/@ungap/promise-all-settled": {
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       "resolved": "https://registry.npmjs.org/@ungap/promise-all-settled/-/promise-all-settled-1.1.2.tgz",
@@ -242,13 +306,6 @@
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@@ -340,6 +397,16 @@
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+    "node_modules/are-docs-informative": {
+      "version": "0.0.2",
+      "resolved": "https://registry.npmjs.org/are-docs-informative/-/are-docs-informative-0.0.2.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=14"
+      }
+    },
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       "resolved": "https://registry.npmjs.org/argparse/-/argparse-2.0.1.tgz",
@@ -565,6 +632,16 @@
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+    "node_modules/comment-parser": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/comment-parser/-/comment-parser-1.4.1.tgz",
+      "integrity": "sha512-buhp5kePrmda3vhc5B9t7pUQXAb2Tnd0qgpkIhPhkHXxJpiPJ11H0ZEU0oBpJ2QztSbzG/ZxMj/CHsYJqRHmyg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
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@@ -661,24 +738,19 @@
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       "dev": true
     },
+    "node_modules/es-module-lexer": {
+      "version": "1.5.4",
+      "resolved": "https://registry.npmjs.org/es-module-lexer/-/es-module-lexer-1.5.4.tgz",
+      "integrity": "sha512-MVNK56NiMrOwitFB7cqDwq0CQutbw+0BvLshJSse0MUNU+y1FC3bUS/AQg7oUng+/wKrrki7JfmwtVHkVfPLlw==",
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+      "license": "MIT"
+    },
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@@ -764,6 +836,31 @@
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       }
     },
+    "node_modules/eslint-plugin-jsdoc": {
+      "version": "48.5.0",
+      "resolved": "https://registry.npmjs.org/eslint-plugin-jsdoc/-/eslint-plugin-jsdoc-48.5.0.tgz",
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+      "dev": true,
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "@es-joy/jsdoccomment": "~0.43.1",
+        "are-docs-informative": "^0.0.2",
+        "comment-parser": "1.4.1",
+        "debug": "^4.3.4",
+        "escape-string-regexp": "^4.0.0",
+        "esquery": "^1.5.0",
+        "parse-imports": "^2.1.0",
+        "semver": "^7.6.2",
+        "spdx-expression-parse": "^4.0.0",
+        "synckit": "^0.9.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "peerDependencies": {
+        "eslint": "^7.0.0 || ^8.0.0 || ^9.0.0"
+      }
+    },
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@@ -1295,12 +1392,6 @@
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@@ -1441,16 +1532,17 @@
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-        "flatted": "^3.2.9",
-        "keyv": "^4.5.3",
-        "rimraf": "^3.0.2"
-      },
-      "engines": {
-        "node": "^10.12.0 || >=12.0.0"
-      }
-    },
-    "node_modules/grunt-eslint/node_modules/glob-parent": {
-      "version": "6.0.2",
-      "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-6.0.2.tgz",
-      "integrity": "sha512-XxwI8EOhVQgWp6iDL+3b0r86f4d6AX6zSU55HfB4ydCEuXLXc5FcYeOu+nnGftS4TEju/11rt4KJPTMgbfmv4A==",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "is-glob": "^4.0.3"
-      },
-      "engines": {
-        "node": ">=10.13.0"
-      }
-    },
-    "node_modules/grunt-eslint/node_modules/globals": {
-      "version": "13.24.0",
-      "resolved": "https://registry.npmjs.org/globals/-/globals-13.24.0.tgz",
-      "integrity": "sha512-AhO5QUcj8llrbG09iWhPU2B204J1xnPeL8kQmVorSsy+Sjj1sk8gIyh6cUocGmH4L0UuhAJy+hJMRA4mgA4mFQ==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "type-fest": "^0.20.2"
-      },
-      "engines": {
-        "node": ">=8"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/sindresorhus"
-      }
-    },
-    "node_modules/grunt-eslint/node_modules/minimatch": {
-      "version": "3.1.2",
-      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.2.tgz",
-      "integrity": "sha512-J7p63hRiAjw1NDEww1W7i37+ByIrOWO5XQQAzZ3VOcL0PNybwpfmV/N05zFAzwQ9USyEcX6t3UO+K5aqBQOIHw==",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "brace-expansion": "^1.1.7"
-      },
-      "engines": {
-        "node": "*"
-      }
-    },
     "node_modules/grunt-known-options": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/grunt-known-options/-/grunt-known-options-2.0.0.tgz",
@@ -2323,6 +2194,16 @@
         "js-yaml": "bin/js-yaml.js"
       }
     },
+    "node_modules/jsdoc-type-pratt-parser": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/jsdoc-type-pratt-parser/-/jsdoc-type-pratt-parser-4.0.0.tgz",
+      "integrity": "sha512-YtOli5Cmzy3q4dP26GraSOeAhqecewG04hoO8DY56CH4KJ9Fvv5qKWUCCo3HZob7esJQHCv6/+bnTy72xZZaVQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12.0.0"
+      }
+    },
     "node_modules/json-buffer": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/json-buffer/-/json-buffer-3.0.1.tgz",
@@ -2775,6 +2656,20 @@
         "node": ">=0.8"
       }
     },
+    "node_modules/parse-imports": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/parse-imports/-/parse-imports-2.1.0.tgz",
+      "integrity": "sha512-JQWgmK2o4w8leUkZeZPatWdAny6vXGU/3siIUvMF6J2rDCud9aTt8h/px9oZJ6U3EcfhngBJ635uPFI0q0VAeA==",
+      "dev": true,
+      "license": "Apache 2.0",
+      "dependencies": {
+        "es-module-lexer": "^1.5.3",
+        "slashes": "^3.0.12"
+      },
+      "engines": {
+        "node": ">= 18"
+      }
+    },
     "node_modules/parse-passwd": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/parse-passwd/-/parse-passwd-1.0.0.tgz",
@@ -2984,67 +2879,6 @@
         "node": ">=0.10.0"
       }
     },
-    "node_modules/rimraf": {
-      "version": "3.0.2",
-      "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-3.0.2.tgz",
-      "integrity": "sha512-JZkJMZkAGFFPP2YqXZXPbMlMBgsxzE8ILs4lMIX/2o0L9UBw9O/Y3o6wFw/i9YLapcUJWwqbi3kdxIPdC62TIA==",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "glob": "^7.1.3"
-      },
-      "bin": {
-        "rimraf": "bin.js"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/isaacs"
-      }
-    },
-    "node_modules/rimraf/node_modules/brace-expansion": {
-      "version": "1.1.11",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
-      "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "balanced-match": "^1.0.0",
-        "concat-map": "0.0.1"
-      }
-    },
-    "node_modules/rimraf/node_modules/glob": {
-      "version": "7.2.3",
-      "resolved": "https://registry.npmjs.org/glob/-/glob-7.2.3.tgz",
-      "integrity": "sha512-nFR0zLpU2YCaRxwoCJvL6UvCH2JFyFVIvwTLsIf21AuHlMskA1hhTdk+LlYJtOlYt9v6dvszD2BGRqBL+iQK9Q==",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "fs.realpath": "^1.0.0",
-        "inflight": "^1.0.4",
-        "inherits": "2",
-        "minimatch": "^3.1.1",
-        "once": "^1.3.0",
-        "path-is-absolute": "^1.0.0"
-      },
-      "engines": {
-        "node": "*"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/isaacs"
-      }
-    },
-    "node_modules/rimraf/node_modules/minimatch": {
-      "version": "3.1.2",
-      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.2.tgz",
-      "integrity": "sha512-J7p63hRiAjw1NDEww1W7i37+ByIrOWO5XQQAzZ3VOcL0PNybwpfmV/N05zFAzwQ9USyEcX6t3UO+K5aqBQOIHw==",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "brace-expansion": "^1.1.7"
-      },
-      "engines": {
-        "node": "*"
-      }
-    },
     "node_modules/run-parallel": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/run-parallel/-/run-parallel-1.2.0.tgz",
@@ -3102,6 +2936,19 @@
         "axios": "^1.5.1"
       }
     },
+    "node_modules/semver": {
+      "version": "7.6.2",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.6.2.tgz",
+      "integrity": "sha512-FNAIBWCx9qcRhoHcgcJ0gvU7SN1lYU2ZXuSfl04bSC5OpvDHFyJCjdNHomPXxjQlCBU67YW64PzY7/VIEH7F2w==",
+      "dev": true,
+      "license": "ISC",
+      "bin": {
+        "semver": "bin/semver.js"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/serialize-javascript": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/serialize-javascript/-/serialize-javascript-6.0.0.tgz",
@@ -3132,6 +2979,38 @@
         "node": ">=8"
       }
     },
+    "node_modules/slashes": {
+      "version": "3.0.12",
+      "resolved": "https://registry.npmjs.org/slashes/-/slashes-3.0.12.tgz",
+      "integrity": "sha512-Q9VME8WyGkc7pJf6QEkj3wE+2CnvZMI+XJhwdTPR8Z/kWQRXi7boAWLDibRPyHRTUTPx5FaU7MsyrjI3yLB4HA==",
+      "dev": true,
+      "license": "ISC"
+    },
+    "node_modules/spdx-exceptions": {
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/spdx-exceptions/-/spdx-exceptions-2.5.0.tgz",
+      "integrity": "sha512-PiU42r+xO4UbUS1buo3LPJkjlO7430Xn5SVAhdpzzsPHsjbYVflnnFdATgabnLude+Cqu25p6N+g2lw/PFsa4w==",
+      "dev": true,
+      "license": "CC-BY-3.0"
+    },
+    "node_modules/spdx-expression-parse": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/spdx-expression-parse/-/spdx-expression-parse-4.0.0.tgz",
+      "integrity": "sha512-Clya5JIij/7C6bRR22+tnGXbc4VKlibKSVj2iHvVeX5iMW7s1SIQlqu699JkODJJIhh/pUu8L0/VLh8xflD+LQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "spdx-exceptions": "^2.1.0",
+        "spdx-license-ids": "^3.0.0"
+      }
+    },
+    "node_modules/spdx-license-ids": {
+      "version": "3.0.18",
+      "resolved": "https://registry.npmjs.org/spdx-license-ids/-/spdx-license-ids-3.0.18.tgz",
+      "integrity": "sha512-xxRs31BqRYHwiMzudOrpSiHtZ8i/GeionCBDSilhYRj+9gIcI8wCZTlXZKu9vZIVqViP3dcp9qE5G6AlIaD+TQ==",
+      "dev": true,
+      "license": "CC0-1.0"
+    },
     "node_modules/sprintf-js": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.1.3.tgz",
@@ -3208,6 +3087,23 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/synckit": {
+      "version": "0.9.0",
+      "resolved": "https://registry.npmjs.org/synckit/-/synckit-0.9.0.tgz",
+      "integrity": "sha512-7RnqIMq572L8PeEzKeBINYEJDDxpcH8JEgLwUqBd3TkofhFRbkq4QLR0u+36avGAhCRbk2nnmjcW9SE531hPDg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@pkgr/core": "^0.1.0",
+        "tslib": "^2.6.2"
+      },
+      "engines": {
+        "node": "^14.18.0 || >=16.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/unts"
+      }
+    },
     "node_modules/text-table": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
@@ -3226,6 +3122,13 @@
         "node": ">=8.0"
       }
     },
+    "node_modules/tslib": {
+      "version": "2.6.3",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.6.3.tgz",
+      "integrity": "sha512-xNvxJEOUiWPGhUuUdQgAJPKOOJfGnIyKySOc09XkKsgdUV/3E2zvwZYdejjmRgPCgcym1juLH3226yA7sEFJKQ==",
+      "dev": true,
+      "license": "0BSD"
+    },
     "node_modules/type-check": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
@@ -3238,19 +3141,6 @@
         "node": ">= 0.8.0"
       }
     },
-    "node_modules/type-fest": {
-      "version": "0.20.2",
-      "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.20.2.tgz",
-      "integrity": "sha512-Ne+eE4r0/iWnpAxD852z3A+N0Bt5RN//NjJwRd2VFHEmrywxf5vsZlh4R6lixl6B+wz/8d+maTSAkN1FIkI3LQ==",
-      "dev": true,
-      "license": "(MIT OR CC0-1.0)",
-      "engines": {
-        "node": ">=10"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/sindresorhus"
-      }
-    },
     "node_modules/unc-path-regex": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/unc-path-regex/-/unc-path-regex-0.1.2.tgz",
diff --git a/eo2js/package.json b/eo2js/package.json
index ca184c4..83cc110 100644
--- a/eo2js/package.json
+++ b/eo2js/package.json
@@ -24,13 +24,14 @@
   },
   "devDependencies": {
     "grunt": "^1.6.1",
-    "mocha": "^10.3.0",
+    "mocha": "^10.5.2",
     "xslt3": "^2.6.0",
     "eslint": "9.5.0",
     "eslint-config-google": "0.14.0",
     "grunt-contrib-clean": "2.0.1",
-    "grunt-eslint": "24.3.0",
+    "grunt-eslint": "25.0.0",
     "grunt-mocha-cli": "^7.0.0",
+    "eslint-plugin-jsdoc": "^48.5.0",
     "jspath": "0.4.0"
   }
 }
diff --git a/eo2js/src/commands/dataize.js b/eo2js/src/commands/dataize.js
index bdcb064..0e51240 100644
--- a/eo2js/src/commands/dataize.js
+++ b/eo2js/src/commands/dataize.js
@@ -4,9 +4,9 @@ const {execSync} = require('child_process')
 
 /**
  * Dataize command.
- * @param {String} obj - Entry object
- * @param {Array..<String>} args - EO program arguments
- * @param {{target: String, project: String}} options - Program options
+ * @param {string} obj - Entry object
+ * @param {Array.<string>} args - EO program arguments
+ * @param {{target: string, project: string}} options - Program options
  */
 const dataize = function(obj, args, options) {
   options = {...program.opts(), ...options}
diff --git a/eo2js/src/commands/link.js b/eo2js/src/commands/link.js
index 2ec3924..6489fa7 100644
--- a/eo2js/src/commands/link.js
+++ b/eo2js/src/commands/link.js
@@ -12,9 +12,9 @@ const main = '__main__.js'
 /**
  * Data to insert to package.json file.
  * If path to local dependency is present - eo2js-runtime dependency won't be added.
- * @param {String} [runtime] - Path to local eo-runtime dependency
+ * @param {string} [runtime] - Path to local eo-runtime dependency
  * @param {boolean} [tests] - Add dependencies for testing
- * @return {{author: string, name: string, version: string}} - The content for package.json file
+ * @returns {{author: string, name: string, version: string}} - The content for package.json file
  */
 const pckg = function(runtime, tests) {
   const def = {
@@ -41,7 +41,7 @@ const pckg = function(runtime, tests) {
 
 /**
  * Build npm project.
- * @param {{target: String, project: String, resources: String, dependency: ?String, tests: ?boolean}} options - Program options
+ * @param {{target: string, project: string, resources: string, dependency: ?string, tests: ?boolean}} options - Program options
  */
 const link = function(options) {
   options = {...program.opts(), ...options}
diff --git a/eo2js/src/commands/test.js b/eo2js/src/commands/test.js
index 9c085f0..b20f429 100644
--- a/eo2js/src/commands/test.js
+++ b/eo2js/src/commands/test.js
@@ -4,7 +4,7 @@ const {execSync} = require('child_process')
 
 /**
  * Test command.
- * @param {{target: String, project: String, exclude: String}} options - Program options
+ * @param {{target: string, project: string, exclude: string}} options - Program options
  */
 const test = function(options) {
   options = {...program.opts(), ...options}
diff --git a/eo2js/src/commands/transpile.js b/eo2js/src/commands/transpile.js
index bcdc904..ff035f2 100644
--- a/eo2js/src/commands/transpile.js
+++ b/eo2js/src/commands/transpile.js
@@ -22,8 +22,8 @@ const dir = '8-transpile'
  * - name org.eolang.int + pckg '' -> path org/eolang/int
  * - name org.eolang.int.test + pckg org.eolang -> path org/eolang/int.test
  * If name ends with ".test" and package
- * @param {String} name - Name of the object. May contain dots
- * @return {String} - path from object name
+ * @param {string} name - Name of the object. May contain dots
+ * @returns {string} - path from object name
  */
 const pathFromName = function(name) {
   return name.replace(/\./g, path.sep)
@@ -31,7 +31,7 @@ const pathFromName = function(name) {
 
 /**
  * Make directory if not exist.
- * @param {String} dir - Directory
+ * @param {string} dir - Directory
  */
 const makeDirIfNotExist = function(dir) {
   if (!fs.existsSync(dir)) {
@@ -42,15 +42,15 @@ const makeDirIfNotExist = function(dir) {
 /**
  * Check if given XMIR has meta.
  * @param {any} xmir - XMIR
- * @param {String} name - Name of the meta
- * @return {boolean} - If given XMIR has tests meta or not
+ * @param {string} name - Name of the meta
+ * @returns {boolean} - If given XMIR has tests meta or not
  */
 const hasMeta = function(xmir, name) {
   const metas = xmir.program.metas.meta
   let res = false
   if (Array.isArray(metas)) {
     res = metas.findIndex((meta) => meta.head === name) !== -1
-  } else if (typeof metas === 'object' && metas.hasOwnProperty('head')) {
+  } else if (typeof metas === 'object' && Object.hasOwn(metas, 'head')) {
     res = metas.head === name
   }
   return res
@@ -58,9 +58,9 @@ const hasMeta = function(xmir, name) {
 
 /**
  * Transform XMIR from given tojo and save.
- * @param {Object} tojo - Tojo.
- * @param {{target: String, project: String}} options - Program options
- * @param {Array.<String>} transformations - List of transformations to apply to XMIR
+ * @param {object} tojo - Tojo.
+ * @param {{target: string, project: string}} options - Program options
+ * @param {Array.<string>} transformations - List of transformations to apply to XMIR
  * @param {any} parser - XML parser
  */
 const transform = function(tojo, options, transformations, parser) {
@@ -84,7 +84,7 @@ const transform = function(tojo, options, transformations, parser) {
   if (!Array.isArray(objects)) {
     objects = [objects]
   }
-  const filtered = objects.filter((obj) => !!obj && obj.hasOwnProperty('javascript') && !obj.hasOwnProperty('@_atom'))
+  const filtered = objects.filter((obj) => !!obj && Object.hasOwn(obj, 'javascript') && !Object.hasOwn(obj, '@_atom'))
   const isTest = hasMeta(xml, 'tests')
   const count = isTest ? 0 : 1
   if (filtered.length > count) {
@@ -98,7 +98,7 @@ const transform = function(tojo, options, transformations, parser) {
 
 /**
  * Transpile XMIR to JavaScript.
- * @param {{foreign: String, project: String, resources: String}} options - Transpile command options
+ * @param {{foreign: string, project: string, resources: string}} options - Transpile command options
  */
 const transpile = function(options) {
   options = {...program.opts(), ...options}
@@ -116,7 +116,7 @@ const transpile = function(options) {
   const project = path.resolve(options['target'], options['project'])
   fs.mkdirSync(project, {recursive: true})
   JSON.parse(fs.readFileSync(foreign).toString())
-    .filter((tojo) => tojo.hasOwnProperty(verified))
+    .filter((tojo) => Object.hasOwn(tojo, verified))
     .forEach((tojo) => transform(
       tojo,
       {target: options['target'], project},
diff --git a/eo2js/src/compile-stylesheets.js b/eo2js/src/compile-stylesheets.js
index 692eb0a..0323d2d 100644
--- a/eo2js/src/compile-stylesheets.js
+++ b/eo2js/src/compile-stylesheets.js
@@ -9,27 +9,29 @@ const ext = '.sef.json'
 
 /**
  * Compile style sheet from given source
- * @param {String} source - Source XSL
- * @param {String} dest - Destination
- * @return {String} - Stdout
+ * @param {string} source - Source XSL
+ * @param {string} dest - Destination
+ * @returns {string} - Stdout
  */
 const compile = function(source, dest) {
   console.log(`Recompiling ${source}`)
+  let out = ""
   try {
-    return execSync(
+    out = execSync(
       [
         'node node_modules/xslt3/xslt3.js',
         `-xsl:${source}`,
         `-export:${dest}`
       ].join(' ')
     ).toString()
-  } catch (e) {
+  } catch (_) { /* eslint-disable-line */
   }
+  return out
 }
 
 /**
  * Compile XLS stylesheets to JSON.
- * @param {Array.<String>|undefined} [names] - names of stylesheets to compile
+ * @param {Array.<string>|undefined} [names] - names of stylesheets to compile
  */
 const compileStylesheets = function(names) {
   console.log('Recompiling stylesheets...')
diff --git a/eo2js/test/commands/link.test.js b/eo2js/test/commands/link.test.js
index eff85e7..c20596d 100644
--- a/eo2js/test/commands/link.test.js
+++ b/eo2js/test/commands/link.test.js
@@ -12,8 +12,8 @@ describe('link', function() {
   })
   /**
    * Run "link" command.
-   * @param {String} [args] - Arguments
-   * @return {String} - Stdout.
+   * @param {string} [args] - Arguments
+   * @returns {string} - Stdout.
    */
   const link = function(...args) {
     return runSync([
diff --git a/eo2js/test/commands/transpile.test.js b/eo2js/test/commands/transpile.test.js
index 363648b..66bcba7 100644
--- a/eo2js/test/commands/transpile.test.js
+++ b/eo2js/test/commands/transpile.test.js
@@ -37,8 +37,8 @@ describe('transpile', function() {
     })
     /**
      * Call transpile command.
-     * @param {String} name - Name of the object to transpile
-     * @return {String} - Stdout
+     * @param {string} name - Name of the object to transpile
+     * @returns {string} - Stdout
      */
     const transpile = function(name = 'simple') {
       const verified = path.resolve(target, `6-verify/com/eo2js/${name}.xmir`)
diff --git a/eo2js/test/helpers.js b/eo2js/test/helpers.js
index e78da5c..73264d2 100644
--- a/eo2js/test/helpers.js
+++ b/eo2js/test/helpers.js
@@ -9,11 +9,10 @@ const jp = require('jspath')
 
 /**
  * Execute JS file with node.
- *
- * @param {String} js - JS file to execute
- * @param {Array.<String>} args - Arguments
+ * @param {string} js - JS file to execute
+ * @param {Array.<string>} args - Arguments
  * @param {boolean} print - Capture logs or not
- * @return {string} Stdout
+ * @returns {string} Stdout
  */
 const execNode = function(js, args, print) {
   try {
@@ -22,7 +21,7 @@ const execNode = function(js, args, print) {
       {
         timeout: 1200000,
         windowsHide: true,
-        stdio: print ? null : 'ignore'
+        stdio: print ? null : 'ignore',
       }
     ).toString()
   } catch (ex) {
@@ -33,10 +32,9 @@ const execNode = function(js, args, print) {
 
 /**
  * Helper to run eo2js command line tool.
- *
  * @param {Array.<string>} args - Array of args
- * @param {Boolean} print - Capture logs
- * @return {String} Stdout
+ * @param {boolean} print - Capture logs
+ * @returns {string} Stdout
  */
 const runSync = function(args, print = true) {
   return execNode(path.resolve('./src/eo2js.js'), args, print)
@@ -44,9 +42,8 @@ const runSync = function(args, print = true) {
 
 /**
  * Assert that all files exist.
- *
- * @param {String} stdout - The stdout printed
- * @param {String} home - The location of files to match
+ * @param {string} stdout - The stdout printed
+ * @param {string} home - The location of files to match
  * @param {Array} paths - Array of file paths
  */
 const assertFilesExist = function(stdout, home, paths) {
@@ -67,8 +64,8 @@ const parser = new XMLParser({ignoreAttributes: false})
 
 /**
  * Transformations test pack.
- * @param {{home: String, sources: String, target: String, json: Object}} params - Pack params
- * @return {{skip: boolean, failures: array.<String>, xmir: String, json: Object}} - Output
+ * @param {{home: string, sources: string, target: string, json: object}} params - Pack params
+ * @returns {{skip: boolean, failures: Array.<string>, xmir: string, json: object}} - Output
  */
 const pack = function(params) {
   const res = {
diff --git a/eo2js/test/it/runtime-tests.test.js b/eo2js/test/it/runtime-tests.test.js
index bb9cc8b..5712d77 100644
--- a/eo2js/test/it/runtime-tests.test.js
+++ b/eo2js/test/it/runtime-tests.test.js
@@ -18,8 +18,8 @@ const exclude = [
 
 /**
  * Read all files from given directory.
- * @param {String} dir - Directory
- * @return {Array.<String>} - Files from the directory
+ * @param {string} dir - Directory
+ * @returns {Array.<string>} - Files from the directory
  */
 const allFilesFrom = function(dir) {
   const files = fs.readdirSync(dir, {withFileTypes: true});
diff --git a/eo2js/test/mvnw/mvnw.js b/eo2js/test/mvnw/mvnw.js
index 2bf38a0..3c0030d 100644
--- a/eo2js/test/mvnw/mvnw.js
+++ b/eo2js/test/mvnw/mvnw.js
@@ -4,13 +4,13 @@ const fs = require('fs');
 
 /**
  * Version.
- * @type {null|String}
+ * @type {null|string}
  */
 let ver = null
 
 /**
  * Get EO version.
- * @return {String} - EO version
+ * @returns {string} - EO version
  */
 const version = function() {
   if (ver == null) {
@@ -21,18 +21,19 @@ const version = function() {
 
 /**
  * The shell to use (depending on operating system).
- * @return {String} - Path to shell or "undefined" if default one should be used
+ * @returns {string|undefined} - Path to shell or "undefined" if default one should be used
  */
 function shell() {
   if (process.platform === 'win32') {
     return 'C:\\Windows\\SysWOW64\\WindowsPowerShell\\v1.0\\powershell.exe';
   }
+  return undefined
 }
 
 /**
  * Prepare options for Maven.
- * @param {{sources: String, target: String, home: String}} opts - Options
- * @return {Array.<String>} - Maven options
+ * @param {{sources: string, target: string, home: string}} opts - Options
+ * @returns {Array.<string>} - Maven options
  */
 const flags = function(opts) {
   return [
@@ -44,8 +45,8 @@ const flags = function(opts) {
 
 /**
  * Execute given goals of eo-maven-plugin.
- * @param {Array.<String>} goals - Goals to execute in right order
- * @param {{sources: String, target: String, home: String}} opts - Options
+ * @param {Array.<string>} goals - Goals to execute in right order
+ * @param {{sources: string, target: string, home: string}} opts - Options
  */
 const mvnw = function(goals, opts) {
   const bin = path.resolve(__dirname, 'mvnw') + (process.platform === 'win32' ? '.cmd' : '');
diff --git a/eo2js/test/resources/dataize/app.js b/eo2js/test/resources/dataize/app.js
index aba83ea..7882be8 100644
--- a/eo2js/test/resources/dataize/app.js
+++ b/eo2js/test/resources/dataize/app.js
@@ -1,6 +1,6 @@
 /**
  * Object for testing dataization.
- * @return {Object} object - Test object
+ * @returns {object} object - Test object
  */
 const app = function() {
   const object = require('eo2js-runtime/src/runtime/object')
diff --git a/eo2js/test/resources/test/second-test.test.js b/eo2js/test/resources/test/second-test.test.js
index af5413a..0f62e2b 100644
--- a/eo2js/test/resources/test/second-test.test.js
+++ b/eo2js/test/resources/test/second-test.test.js
@@ -1,6 +1,6 @@
 /**
  * Second test.
- * @return {Object} object - Test object
+ * @returns {object} object - Test object
  */
 const second_test = function() {
   const object = require('eo2js-runtime/src/runtime/object')
diff --git a/eo2js/test/resources/test/simple-test.test.js b/eo2js/test/resources/test/simple-test.test.js
index ed06090..a42f0fa 100644
--- a/eo2js/test/resources/test/simple-test.test.js
+++ b/eo2js/test/resources/test/simple-test.test.js
@@ -1,6 +1,6 @@
 /**
  * Simple test.
- * @return {Object} object - Test object
+ * @returns {object} object - Test object
  */
 const simple_test = function() {
   const object = require('eo2js-runtime/src/runtime/object')
diff --git a/package.json b/package.json
index c0485bc..64e96bc 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
     "postinstall": "npm run install-eo2js && npm run install-eo2js-runtime",
     "test-eo2js": "cd eo2js && grunt",
     "test-eo2js-runtime": "cd eo2js-runtime && grunt",
-    "test": "npm run test-eo2js && npm run test-eo2js-runtime"
+    "test": "npm run test-eo2js-runtime && npm run test-eo2js"
   },
   "author": "maxonfjvipon",
   "license": "MIT"