diff --git a/CHANGELOG.md b/CHANGELOG.md
index b4ce1ab4..f5416fc5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.0.0-rc.12] - 2024-02-28
+### Removed
+- `all` - Compling output into `.mjs` extension
+
 ## [1.0.0-rc.11] - 2024-02-28
 ### Changed
 - `all`
@@ -362,7 +366,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 [old repo]: https://github.com/distributed-lab/web-kit-old
 
-[Unreleased]: https://github.com/distributed-lab/web-kit/compare/1.0.0-rc.11...HEAD
+[Unreleased]: https://github.com/distributed-lab/web-kit/compare/1.0.0-rc.12...HEAD
+[1.0.0-rc.12]: https://github.com/distributed-lab/web-kit/compare/1.0.0-rc.11...1.0.0-rc.12
 [1.0.0-rc.11]: https://github.com/distributed-lab/web-kit/compare/1.0.0-rc.10...1.0.0-rc.11
 [1.0.0-rc.10]: https://github.com/distributed-lab/web-kit/compare/1.0.0-rc.9...1.0.0-rc.10
 [1.0.0-rc.9]: https://github.com/distributed-lab/web-kit/compare/1.0.0-rc.8...1.0.0-rc.9
diff --git a/packages/fetcher/.npmignore b/packages/fetcher/.npmignore
index fcd829ee..d1d5c424 100644
--- a/packages/fetcher/.npmignore
+++ b/packages/fetcher/.npmignore
@@ -4,3 +4,4 @@ jest.config.js
 tsconfig.json
 tsconfig.build.json
 .swcrc
+postbuild.js
diff --git a/packages/fetcher/package.json b/packages/fetcher/package.json
index cbc3c4b3..4bf2d73a 100644
--- a/packages/fetcher/package.json
+++ b/packages/fetcher/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@distributedlab/fetcher",
-  "version": "1.0.0-rc.11",
+  "version": "1.0.0-rc.12",
   "description": "Fetch API wrapper with the extended functionality and simple interface",
   "repository": {
     "type": "git",
@@ -18,8 +18,8 @@
     }
   },
   "main": "./dist/cjs/index.js",
-  "module": "./dist/esm/index.mjs",
-  "browser": "./dist/esm/index.mjs",
+  "module": "./dist/esm/index.js",
+  "browser": "./dist/esm/index.js",
   "node": "./dist/cjs/index.js",
   "types": "index.d.ts",
   "exports": {
@@ -27,16 +27,16 @@
       "types": "./dist/types/index.d.ts",
       "require": "./dist/cjs/index.js",
       "node": "./dist/cjs/index.js",
-      "import": "./dist/esm/index.mjs",
-      "default": "./dist/esm/index.mjs"
+      "import": "./dist/esm/index.js",
+      "default": "./dist/esm/index.js"
     }
   },
   "scripts": {
     "build": "yarn clean && yarn build:types && yarn build:cjs && yarn build:esm && yarn build:tsc-alias",
     "build:types": "tsc -p tsconfig.build.json --outDir ./dist/types --declaration --emitDeclarationOnly",
     "build:cjs": "npx swc src -d ./dist/cjs --strip-leading-paths --config-file .swcrc -C module.type=commonjs",
-    "build:esm": "npx swc src -d ./dist/esm --strip-leading-paths --out-file-extension mjs --config-file .swcrc -C isModule=true",
-    "build:tsc-alias": "tsc-alias -p tsconfig.json --outDir ./dist/types",
+    "build:esm": "npx swc src -d ./dist/esm --strip-leading-paths --config-file .swcrc -C isModule=true -C module.type=es6",
+    "build:tsc-alias": "node ./postbuild.js",
     "clean": "rm -rf dist",
     "test": "yarn jest --verbose",
     "typecheck": "tsc --noEmit"
diff --git a/packages/fetcher/postbuild.js b/packages/fetcher/postbuild.js
new file mode 100644
index 00000000..71314763
--- /dev/null
+++ b/packages/fetcher/postbuild.js
@@ -0,0 +1,3 @@
+const postbuild = require('../../scripts/postbuild')
+
+postbuild(__dirname)
diff --git a/packages/jac/.npmignore b/packages/jac/.npmignore
index fcd829ee..d1d5c424 100644
--- a/packages/jac/.npmignore
+++ b/packages/jac/.npmignore
@@ -4,3 +4,4 @@ jest.config.js
 tsconfig.json
 tsconfig.build.json
 .swcrc
+postbuild.js
diff --git a/packages/jac/package.json b/packages/jac/package.json
index 5e3636db..1d72426b 100644
--- a/packages/jac/package.json
+++ b/packages/jac/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@distributedlab/jac",
-  "version": "1.0.0-rc.11",
+  "version": "1.0.0-rc.12",
   "description": "A library for constructing JSON-API compliant requests and responses",
   "repository": {
     "type": "git",
@@ -18,8 +18,8 @@
     }
   },
   "main": "./dist/cjs/index.js",
-  "module": "./dist/esm/index.mjs",
-  "browser": "./dist/esm/index.mjs",
+  "module": "./dist/esm/index.js",
+  "browser": "./dist/esm/index.js",
   "node": "./dist/cjs/index.js",
   "types": "index.d.ts",
   "exports": {
@@ -27,16 +27,16 @@
       "types": "./dist/types/index.d.ts",
       "require": "./dist/cjs/index.js",
       "node": "./dist/cjs/index.js",
-      "import": "./dist/esm/index.mjs",
-      "default": "./dist/esm/index.mjs"
+      "import": "./dist/esm/index.js",
+      "default": "./dist/esm/index.js"
     }
   },
   "scripts": {
     "build": "yarn clean && yarn build:types && yarn build:cjs && yarn build:esm && yarn build:tsc-alias",
     "build:types": "tsc -p tsconfig.build.json --outDir ./dist/types --declaration --emitDeclarationOnly",
     "build:cjs": "npx swc src -d ./dist/cjs --strip-leading-paths --config-file .swcrc -C module.type=commonjs",
-    "build:esm": "npx swc src -d ./dist/esm --strip-leading-paths --out-file-extension mjs --config-file .swcrc -C isModule=true",
-    "build:tsc-alias": "tsc-alias -p tsconfig.json --outDir ./dist/types",
+    "build:esm": "npx swc src -d ./dist/esm --strip-leading-paths --config-file .swcrc -C isModule=true -C module.type=es6",
+    "build:tsc-alias": "node ./postbuild.js",
     "clean": "rm -rf dist",
     "test": "yarn jest --verbose",
     "typecheck": "tsc --noEmit"
diff --git a/packages/jac/postbuild.js b/packages/jac/postbuild.js
new file mode 100644
index 00000000..71314763
--- /dev/null
+++ b/packages/jac/postbuild.js
@@ -0,0 +1,3 @@
+const postbuild = require('../../scripts/postbuild')
+
+postbuild(__dirname)
diff --git a/packages/reactivity/.npmignore b/packages/reactivity/.npmignore
index fcd829ee..d1d5c424 100644
--- a/packages/reactivity/.npmignore
+++ b/packages/reactivity/.npmignore
@@ -4,3 +4,4 @@ jest.config.js
 tsconfig.json
 tsconfig.build.json
 .swcrc
+postbuild.js
diff --git a/packages/reactivity/package.json b/packages/reactivity/package.json
index c4d80ae5..dbc501a2 100644
--- a/packages/reactivity/package.json
+++ b/packages/reactivity/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@distributedlab/reactivity",
-  "version": "1.0.0-rc.11",
+  "version": "1.0.0-rc.12",
   "description": "Implementation of the reactivity connections to propagate changes between objects",
   "repository": {
     "type": "git",
@@ -18,8 +18,8 @@
     }
   },
   "main": "./dist/cjs/index.js",
-  "module": "./dist/esm/index.mjs",
-  "browser": "./dist/esm/index.mjs",
+  "module": "./dist/esm/index.js",
+  "browser": "./dist/esm/index.js",
   "node": "./dist/cjs/index.js",
   "types": "index.d.ts",
   "exports": {
@@ -27,16 +27,16 @@
       "types": "./dist/types/index.d.ts",
       "require": "./dist/cjs/index.js",
       "node": "./dist/cjs/index.js",
-      "import": "./dist/esm/index.mjs",
-      "default": "./dist/esm/index.mjs"
+      "import": "./dist/esm/index.js",
+      "default": "./dist/esm/index.js"
     }
   },
   "scripts": {
     "build": "yarn clean && yarn build:types && yarn build:cjs && yarn build:esm && yarn build:tsc-alias",
     "build:types": "tsc -p tsconfig.build.json --outDir ./dist/types --declaration --emitDeclarationOnly",
     "build:cjs": "npx swc src -d ./dist/cjs --strip-leading-paths --config-file .swcrc -C module.type=commonjs",
-    "build:esm": "npx swc src -d ./dist/esm --strip-leading-paths --out-file-extension mjs --config-file .swcrc -C isModule=true",
-    "build:tsc-alias": "tsc-alias -p tsconfig.json --outDir ./dist/types",
+    "build:esm": "npx swc src -d ./dist/esm --strip-leading-paths --config-file .swcrc -C isModule=true -C module.type=es6",
+    "build:tsc-alias": "node ./postbuild.js",
     "clean": "rm -rf dist",
     "test": "yarn jest --verbose",
     "typecheck": "tsc --noEmit"
diff --git a/packages/reactivity/postbuild.js b/packages/reactivity/postbuild.js
new file mode 100644
index 00000000..71314763
--- /dev/null
+++ b/packages/reactivity/postbuild.js
@@ -0,0 +1,3 @@
+const postbuild = require('../../scripts/postbuild')
+
+postbuild(__dirname)
diff --git a/packages/tools/.npmignore b/packages/tools/.npmignore
index b626fc94..959ea833 100644
--- a/packages/tools/.npmignore
+++ b/packages/tools/.npmignore
@@ -3,3 +3,4 @@ jest.config.js
 tsconfig.json
 tsconfig.build.json
 .swcrc
+postbuild.js
diff --git a/packages/tools/package.json b/packages/tools/package.json
index 29a3f8ae..053216b7 100644
--- a/packages/tools/package.json
+++ b/packages/tools/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@distributedlab/tools",
-  "version": "1.0.0-rc.11",
+  "version": "1.0.0-rc.12",
   "description": "Collection of common utility functions and classes",
   "repository": {
     "type": "git",
@@ -18,8 +18,8 @@
     }
   },
   "main": "./dist/cjs/index.js",
-  "module": "./dist/esm/index.mjs",
-  "browser": "./dist/esm/index.mjs",
+  "module": "./dist/esm/index.js",
+  "browser": "./dist/esm/index.js",
   "node": "./dist/cjs/index.js",
   "types": "index.d.ts",
   "exports": {
@@ -27,16 +27,16 @@
       "types": "./dist/types/index.d.ts",
       "require": "./dist/cjs/index.js",
       "node": "./dist/cjs/index.js",
-      "import": "./dist/esm/index.mjs",
-      "default": "./dist/esm/index.mjs"
+      "import": "./dist/esm/index.js",
+      "default": "./dist/esm/index.js"
     }
   },
   "scripts": {
     "build": "yarn clean && yarn build:types && yarn build:cjs && yarn build:esm && yarn build:tsc-alias",
     "build:types": "tsc -p tsconfig.build.json --outDir ./dist/types --declaration --emitDeclarationOnly",
     "build:cjs": "npx swc src -d ./dist/cjs --strip-leading-paths --config-file .swcrc -C module.type=commonjs",
-    "build:esm": "npx swc src -d ./dist/esm --strip-leading-paths --out-file-extension mjs --config-file .swcrc -C isModule=true",
-    "build:tsc-alias": "tsc-alias -p tsconfig.json --outDir ./dist/types",
+    "build:esm": "npx swc src -d ./dist/esm --strip-leading-paths --config-file .swcrc -C isModule=true -C module.type=es6",
+    "build:tsc-alias": "node ./postbuild.js",
     "clean": "rm -rf dist",
     "test": "yarn jest --verbose",
     "typecheck": "tsc --noEmit"
diff --git a/packages/tools/postbuild.js b/packages/tools/postbuild.js
new file mode 100644
index 00000000..71314763
--- /dev/null
+++ b/packages/tools/postbuild.js
@@ -0,0 +1,3 @@
+const postbuild = require('../../scripts/postbuild')
+
+postbuild(__dirname)
diff --git a/packages/w3p/.npmignore b/packages/w3p/.npmignore
index 1ab122df..fb4a8915 100644
--- a/packages/w3p/.npmignore
+++ b/packages/w3p/.npmignore
@@ -4,3 +4,4 @@ jest.config.js
 tsconfig.json
 tsconfig.build.json
 .swcrc
+postbuild.js
diff --git a/packages/w3p/.swcrc b/packages/w3p/.swcrc
index 982a3303..f614f87a 100644
--- a/packages/w3p/.swcrc
+++ b/packages/w3p/.swcrc
@@ -22,10 +22,16 @@
     "keepClassNames": true,
     "preserveAllComments": true,
     "paths": {
-      "@/*": ["src/*"]
+      "@/*": [
+        "src/*"
+      ]
     }
   },
-  "exclude": ["examples","src/tests", ".test.ts"],
+  "exclude": [
+    "examples",
+    "src/tests",
+    ".test.ts"
+  ],
   "minify": false,
   "sourceMaps": "inline"
 }
diff --git a/packages/w3p/package.json b/packages/w3p/package.json
index 23be4419..95955713 100644
--- a/packages/w3p/package.json
+++ b/packages/w3p/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@distributedlab/w3p",
-  "version": "1.0.0-rc.11",
+  "version": "1.0.0-rc.12",
   "description": "Wrapper for Web3 Providers",
   "repository": {
     "type": "git",
@@ -18,8 +18,8 @@
     }
   },
   "main": "./dist/cjs/index.js",
-  "module": "./dist/esm/index.mjs",
-  "browser": "./dist/esm/index.mjs",
+  "module": "./dist/esm/index.js",
+  "browser": "./dist/esm/index.js",
   "node": "./dist/cjs/index.js",
   "types": "index.d.ts",
   "exports": {
@@ -27,16 +27,16 @@
       "types": "./dist/types/index.d.ts",
       "require": "./dist/cjs/index.js",
       "node": "./dist/cjs/index.js",
-      "import": "./dist/esm/index.mjs",
-      "default": "./dist/esm/index.mjs"
+      "import": "./dist/esm/index.js",
+      "default": "./dist/esm/index.js"
     }
   },
   "scripts": {
     "build": "yarn clean && yarn build:types && yarn build:cjs && yarn build:esm && yarn build:tsc-alias",
     "build:types": "tsc -p tsconfig.build.json --outDir ./dist/types --declaration --emitDeclarationOnly",
     "build:cjs": "npx swc src -d ./dist/cjs --strip-leading-paths --config-file .swcrc -C module.type=commonjs",
-    "build:esm": "npx swc src -d ./dist/esm --strip-leading-paths --out-file-extension mjs --config-file .swcrc -C isModule=true",
-    "build:tsc-alias": "tsc-alias -p tsconfig.json --outDir ./dist/types",
+    "build:esm": "npx swc src -d ./dist/esm --strip-leading-paths --config-file .swcrc -C isModule=true -C module.type=es6",
+    "build:tsc-alias": "node ./postbuild.js",
     "clean": "rm -rf dist",
     "test": "yarn jest --verbose",
     "typecheck": "tsc --noEmit"
diff --git a/packages/w3p/postbuild.js b/packages/w3p/postbuild.js
new file mode 100644
index 00000000..71314763
--- /dev/null
+++ b/packages/w3p/postbuild.js
@@ -0,0 +1,3 @@
+const postbuild = require('../../scripts/postbuild')
+
+postbuild(__dirname)
diff --git a/scripts/postbuild.js b/scripts/postbuild.js
new file mode 100644
index 00000000..6f95f1e8
--- /dev/null
+++ b/scripts/postbuild.js
@@ -0,0 +1,22 @@
+const fs = require('fs');
+const { replaceTscAliasPaths } = require('tsc-alias')
+
+const writeFile = (path, data) => {
+  fs.writeFile(path, JSON.stringify(data), (err) => {
+    if (err) throw err
+  })
+}
+
+module.exports = function postBuild(dirpath) {
+  writeFile(`${dirpath}/dist/esm/package.json`, {
+    "type": "module",
+  })
+  writeFile(`${dirpath}/dist/cjs/package.json`, {
+    "type": "commonjs",
+  })
+
+  replaceTscAliasPaths({
+    tsconfigPath: `${dirpath}/tsconfig.json`,
+    outDir: `${dirpath}/dist/types`,
+  })
+}