diff --git a/index.d.ts b/index.d.ts
index 1099dc21..5830793f 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -1,38 +1,49 @@
 /* eslint-disable @typescript-eslint/no-explicit-any */
 
-declare namespace sortPackageJsonExports {
+declare namespace sortPackageJson {
   interface SortPackageJsonFn {
     /**
-      * Sort packageJson object.
-      *
-      * @param packageJson - A packageJson
-      * @param options
-      * @returns Sorted packageJson object
-      */
-    <T extends Record<any, any>>(packageJson: T, options?: Options): T,
+     * Sort packageJson object.
+     *
+     * @param packageJson - A packageJson
+     * @param options - An options object
+     * @returns Sorted packageJson object
+     */
+    <T extends Record<any, any>>(packageJson: T, options?: Options): T
 
     /**
-      * Sort packageJson string.
-      *
-      * @param packageJson - A packageJson string.
-      * @param options
-      * @returns Sorted packageJson string.
-      */
-    (packageJson: string, options?: Options): string,
+     * Sort packageJson string.
+     *
+     * @param packageJson - A packageJson string.
+     * @param options - An options object
+     * @returns Sorted packageJson string.
+     */
+    (packageJson: string, options?: Options): string
   }
 
-  type ComparatorFunction = (left: string, right: string) => number;
+  type ComparatorFunction = (left: string, right: string) => number
+
+  function sortObjectBy<T extends Record<any, any>>(
+    comparator?: string[],
+    deep?: boolean,
+  ): (x: T) => T
+
+  interface Field {
+    readonly key: string
+    over?<T extends Record<any, any>>(x: T): T
+  }
 
   interface Options {
-    readonly sortOrder?: readonly string[] | ComparatorFunction;
+    readonly sortOrder?: readonly string[] | ComparatorFunction
   }
 }
 
-interface sortPackageJsonExports extends sortPackageJsonExports.SortPackageJsonFn {
-  readonly default: sortPackageJsonExports.SortPackageJsonFn;
-  readonly sortPackageJson: sortPackageJsonExports.SortPackageJsonFn;
+interface sortPackageJsonExports extends sortPackageJson.SortPackageJsonFn {
+  readonly default: sortPackageJson.SortPackageJsonFn
+  readonly sortPackageJson: sortPackageJson.SortPackageJsonFn
+  readonly sortOrder: string[]
 }
 
-declare const sortPackageJsonExports: sortPackageJsonExports;
+declare const sortPackageJsonExports: sortPackageJsonExports
 
-export = sortPackageJsonExports;
+export = sortPackageJsonExports
diff --git a/index.js b/index.js
index 43f48bb9..bc823209 100755
--- a/index.js
+++ b/index.js
@@ -135,16 +135,14 @@ const sortScripts = onObject((scripts) => {
   const names = Object.keys(scripts)
   const prefixable = new Set()
 
-  const keys = names
-    .map((name) => {
-      const omitted = name.replace(/^(?:pre|post)/, '')
-      if (defaultNpmScripts.has(omitted) || names.includes(omitted)) {
-        prefixable.add(omitted)
-        return omitted
-      }
-      return name
-    })
-    .sort()
+  const keys = names.map((name) => {
+    const omitted = name.replace(/^(?:pre|post)/, '')
+    if (defaultNpmScripts.has(omitted) || names.includes(omitted)) {
+      prefixable.add(omitted)
+      return omitted
+    }
+    return name
+  })
 
   const order = keys.reduce(
     (order, key) =>
diff --git a/package-lock.json b/package-lock.json
index b249a8fb..895c8d26 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -483,6 +483,79 @@
         "arrify": "^1.0.1"
       }
     },
+    "@definitelytyped/header-parser": {
+      "version": "0.0.60",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/@definitelytyped/header-parser/-/header-parser-0.0.60.tgz",
+      "integrity": "sha512-fdfR9DthV9WwUCeLsEIhAJxBjRccX0VnRJIDr9JWbqN3TloKEv/376Lq4/q2zJRUsbJTiKwDxhg6RFwqN34uuA==",
+      "dev": true,
+      "requires": {
+        "@definitelytyped/typescript-versions": "^0.0.60",
+        "@types/parsimmon": "^1.10.1",
+        "parsimmon": "^1.13.0"
+      }
+    },
+    "@definitelytyped/typescript-versions": {
+      "version": "0.0.60",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/@definitelytyped/typescript-versions/-/typescript-versions-0.0.60.tgz",
+      "integrity": "sha512-zu5qXL3lyhBnoi2pxT8MrG2MfNyY+NRII3JjwF8bedAsisNiGwXz5UN01NREhwAf010zfT3XEWORhTBsIzOXkQ==",
+      "dev": true
+    },
+    "@definitelytyped/utils": {
+      "version": "0.0.60",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/@definitelytyped/utils/-/utils-0.0.60.tgz",
+      "integrity": "sha512-USQJzzb3PIJbc/CObC6vEIn2Oum8DaOoXP+qhHoeBEyAwY1YQ6tbX+fBc6k8DHuMY9obdpx/7OUnGE0c8EohHw==",
+      "dev": true,
+      "requires": {
+        "@definitelytyped/typescript-versions": "^0.0.60",
+        "@types/node": "^12.12.29",
+        "charm": "^1.0.2",
+        "fs-extra": "^8.1.0",
+        "fstream": "^1.0.12",
+        "npm-registry-client": "^8.6.0",
+        "tar": "^2.2.2",
+        "tar-stream": "^2.1.4"
+      },
+      "dependencies": {
+        "@types/node": {
+          "version": "12.19.4",
+          "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/@types/node/-/node-12.19.4.tgz",
+          "integrity": "sha512-o3oj1bETk8kBwzz1WlO6JWL/AfAA3Vm6J1B3C9CsdxHYp7XgPiH7OEXPUbZTndHlRaIElrANkQfe6ZmfJb3H2w==",
+          "dev": true
+        },
+        "fs-extra": {
+          "version": "8.1.0",
+          "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/fs-extra/-/fs-extra-8.1.0.tgz",
+          "integrity": "sha512-yhlQgA6mnOJUKOsRUFsgJdQCvkKhcz8tlZG5HBQfReYZy46OwLcY+Zia0mtdHsOo9y/hP+CxMN0TU9QxoOtG4g==",
+          "dev": true,
+          "requires": {
+            "graceful-fs": "^4.2.0",
+            "jsonfile": "^4.0.0",
+            "universalify": "^0.1.0"
+          }
+        },
+        "graceful-fs": {
+          "version": "4.2.4",
+          "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/graceful-fs/-/graceful-fs-4.2.4.tgz",
+          "integrity": "sha512-WjKPNJF79dtJAVniUlGGWHYGz2jWxT6VhN/4m1NdkbZ2nOsEF+cI1Edgql5zCRhs/VsQYRvrXctxktVXZUkixw==",
+          "dev": true
+        },
+        "jsonfile": {
+          "version": "4.0.0",
+          "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/jsonfile/-/jsonfile-4.0.0.tgz",
+          "integrity": "sha1-h3Gq4HmbZAdrdmQPygWPnBDjPss=",
+          "dev": true,
+          "requires": {
+            "graceful-fs": "^4.1.6"
+          }
+        },
+        "universalify": {
+          "version": "0.1.2",
+          "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/universalify/-/universalify-0.1.2.tgz",
+          "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg==",
+          "dev": true
+        }
+      }
+    },
     "@istanbuljs/load-nyc-config": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/@istanbuljs/load-nyc-config/-/load-nyc-config-1.0.0.tgz",
@@ -1130,6 +1203,12 @@
       "integrity": "sha512-//oorEZjL6sbPcKUaCdIGlIUeH26mgzimjBB77G6XRgnDl/L5wOnpyBGRe/Mmf5CVW3PwEBE1NjiMZ/ssFh4wA==",
       "dev": true
     },
+    "@types/parsimmon": {
+      "version": "1.10.4",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/@types/parsimmon/-/parsimmon-1.10.4.tgz",
+      "integrity": "sha512-M56NfQHfaWuaj6daSgCVs7jh8fXLI3LmxjRoQxmOvYesgIkI+9HPsDLO0vd7wX7cwA0D0ZWFEJdp0VPwLdS+bQ==",
+      "dev": true
+    },
     "@types/retry": {
       "version": "0.12.0",
       "resolved": "https://registry.npmjs.org/@types/retry/-/retry-0.12.0.tgz",
@@ -1301,12 +1380,30 @@
         "default-require-extensions": "^3.0.0"
       }
     },
+    "aproba": {
+      "version": "1.2.0",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/aproba/-/aproba-1.2.0.tgz",
+      "integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw==",
+      "dev": true,
+      "optional": true
+    },
     "archy": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/archy/-/archy-1.0.0.tgz",
       "integrity": "sha1-+cjBN1fMHde8N5rHeyxipcKGjEA=",
       "dev": true
     },
+    "are-we-there-yet": {
+      "version": "1.1.5",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz",
+      "integrity": "sha512-5hYdAkZlcG8tOLujVDTgCT+uPX0VnpAH28gWsLfzpXYm7wP6mp5Q/gYyR7YQ0cKVJcXJnl3j2kpBan13PtQf6w==",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "delegates": "^1.0.0",
+        "readable-stream": "^2.0.6"
+      }
+    },
     "argparse": {
       "version": "1.0.10",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
@@ -1372,12 +1469,33 @@
       "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0=",
       "dev": true
     },
+    "asn1": {
+      "version": "0.2.4",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/asn1/-/asn1-0.2.4.tgz",
+      "integrity": "sha512-jxwzQpLQjSmWXgwaCZE9Nz+glAG01yF1QnWgbhGwHI5A6FRIEY6IVqtHhIepHqI7/kyEyQEagBC5mBEFlIYvdg==",
+      "dev": true,
+      "requires": {
+        "safer-buffer": "~2.1.0"
+      }
+    },
+    "assert-plus": {
+      "version": "1.0.0",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/assert-plus/-/assert-plus-1.0.0.tgz",
+      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
+      "dev": true
+    },
     "astral-regex": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/astral-regex/-/astral-regex-2.0.0.tgz",
       "integrity": "sha512-Z7tMw1ytTXt5jqMcOP+OQteU1VuNK9Y02uuJtKQ1Sv69jXQKKg5cibLwGJow8yzZP+eAc18EmLGPal0bp36rvQ==",
       "dev": true
     },
+    "asynckit": {
+      "version": "0.4.0",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/asynckit/-/asynckit-0.4.0.tgz",
+      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=",
+      "dev": true
+    },
     "at-least-node": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/at-least-node/-/at-least-node-1.0.0.tgz",
@@ -1570,6 +1688,77 @@
         }
       }
     },
+    "aws-sign2": {
+      "version": "0.7.0",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/aws-sign2/-/aws-sign2-0.7.0.tgz",
+      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg=",
+      "dev": true
+    },
+    "aws4": {
+      "version": "1.11.0",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/aws4/-/aws4-1.11.0.tgz",
+      "integrity": "sha512-xh1Rl34h6Fi1DC2WWKfxUTVqRsNnr6LsKz2+hfwDxQJWmrx8+c7ylaqBMcHfl1U1r2dsifOvKX3LQuLNZ+XSvA==",
+      "dev": true
+    },
+    "babel-code-frame": {
+      "version": "6.26.0",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
+      "integrity": "sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=",
+      "dev": true,
+      "requires": {
+        "chalk": "^1.1.3",
+        "esutils": "^2.0.2",
+        "js-tokens": "^3.0.2"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "2.1.1",
+          "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/ansi-regex/-/ansi-regex-2.1.1.tgz",
+          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+          "dev": true
+        },
+        "ansi-styles": {
+          "version": "2.2.1",
+          "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/ansi-styles/-/ansi-styles-2.2.1.tgz",
+          "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
+          "dev": true
+        },
+        "chalk": {
+          "version": "1.1.3",
+          "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/chalk/-/chalk-1.1.3.tgz",
+          "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^2.2.1",
+            "escape-string-regexp": "^1.0.2",
+            "has-ansi": "^2.0.0",
+            "strip-ansi": "^3.0.0",
+            "supports-color": "^2.0.0"
+          }
+        },
+        "js-tokens": {
+          "version": "3.0.2",
+          "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/js-tokens/-/js-tokens-3.0.2.tgz",
+          "integrity": "sha1-mGbfOVECEw449/mWvOtlRDIJwls=",
+          "dev": true
+        },
+        "strip-ansi": {
+          "version": "3.0.1",
+          "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^2.0.0"
+          }
+        },
+        "supports-color": {
+          "version": "2.0.0",
+          "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/supports-color/-/supports-color-2.0.0.tgz",
+          "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
+          "dev": true
+        }
+      }
+    },
     "babel-polyfill": {
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-polyfill/-/babel-polyfill-6.26.0.tgz",
@@ -1612,6 +1801,21 @@
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
       "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c="
     },
+    "base64-js": {
+      "version": "1.5.1",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/base64-js/-/base64-js-1.5.1.tgz",
+      "integrity": "sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA==",
+      "dev": true
+    },
+    "bcrypt-pbkdf": {
+      "version": "1.0.2",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz",
+      "integrity": "sha1-pDAdOJtqQ/m2f/PKEaP2Y342Dp4=",
+      "dev": true,
+      "requires": {
+        "tweetnacl": "^0.14.3"
+      }
+    },
     "before-after-hook": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/before-after-hook/-/before-after-hook-2.1.0.tgz",
@@ -1624,6 +1828,45 @@
       "integrity": "sha512-Phlt0plgpIIBOGTT/ehfFnbNlfsDEiqmzE2KRXoX1bLIlir4X/MR+zSyBEkL05ffWgnRSf/DXv+WrUAVr93/ow==",
       "dev": true
     },
+    "bl": {
+      "version": "4.0.3",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/bl/-/bl-4.0.3.tgz",
+      "integrity": "sha512-fs4G6/Hu4/EE+F75J8DuN/0IpQqNjAdC7aEQv7Qt8MHGUH7Ckv2MwTEEeN9QehD0pfIDkMI1bkHYkKy7xHyKIg==",
+      "dev": true,
+      "requires": {
+        "buffer": "^5.5.0",
+        "inherits": "^2.0.4",
+        "readable-stream": "^3.4.0"
+      },
+      "dependencies": {
+        "inherits": {
+          "version": "2.0.4",
+          "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/inherits/-/inherits-2.0.4.tgz",
+          "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==",
+          "dev": true
+        },
+        "readable-stream": {
+          "version": "3.6.0",
+          "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/readable-stream/-/readable-stream-3.6.0.tgz",
+          "integrity": "sha512-BViHy7LKeTz4oNnkcLJ+lVSL6vpiFeX6/d3oSH8zCW7UxP2onchk+vTGB143xuFjHS3deTgkKoXXymXqymiIdA==",
+          "dev": true,
+          "requires": {
+            "inherits": "^2.0.3",
+            "string_decoder": "^1.1.1",
+            "util-deprecate": "^1.0.1"
+          }
+        }
+      }
+    },
+    "block-stream": {
+      "version": "0.0.9",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/block-stream/-/block-stream-0.0.9.tgz",
+      "integrity": "sha1-E+v+d4oDIFz+A3UUgeu0szAMEmo=",
+      "dev": true,
+      "requires": {
+        "inherits": "~2.0.0"
+      }
+    },
     "blueimp-md5": {
       "version": "2.12.0",
       "resolved": "https://registry.npmjs.org/blueimp-md5/-/blueimp-md5-2.12.0.tgz",
@@ -1727,6 +1970,16 @@
         "fill-range": "^7.0.1"
       }
     },
+    "buffer": {
+      "version": "5.7.1",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/buffer/-/buffer-5.7.1.tgz",
+      "integrity": "sha512-EHcyIPBQ4BSGlvjB16k5KgAJ27CIsHY/2JBmCRReo48y9rQ3MaUzWX3KVlBa4U7MyX02HdVj0K7C3WaB3ju7FQ==",
+      "dev": true,
+      "requires": {
+        "base64-js": "^1.3.1",
+        "ieee754": "^1.1.13"
+      }
+    },
     "buffer-from": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.1.tgz",
@@ -1739,6 +1992,12 @@
       "integrity": "sha1-Jw8HbFpywC9bZaR9+Uxf46J4iS8=",
       "dev": true
     },
+    "builtins": {
+      "version": "1.0.3",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/builtins/-/builtins-1.0.3.tgz",
+      "integrity": "sha1-y5T662HIaWRR2zZTThQi+U8K7og=",
+      "dev": true
+    },
     "cacheable-request": {
       "version": "6.1.0",
       "resolved": "https://registry.npmjs.org/cacheable-request/-/cacheable-request-6.1.0.tgz",
@@ -1842,6 +2101,12 @@
         "redeyed": "~2.1.0"
       }
     },
+    "caseless": {
+      "version": "0.12.0",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/caseless/-/caseless-0.12.0.tgz",
+      "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=",
+      "dev": true
+    },
     "chalk": {
       "version": "2.4.1",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.1.tgz",
@@ -1859,6 +2124,15 @@
       "integrity": "sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA==",
       "dev": true
     },
+    "charm": {
+      "version": "1.0.2",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/charm/-/charm-1.0.2.tgz",
+      "integrity": "sha1-it02cVOm2aWBMxBSxAkJkdqZXjU=",
+      "dev": true,
+      "requires": {
+        "inherits": "^2.0.1"
+      }
+    },
     "chokidar": {
       "version": "3.3.1",
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+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/slide/-/slide-1.1.6.tgz",
+      "integrity": "sha1-VusCfWW00tzmyy4tMsTUr8nh1wc=",
+      "dev": true
+    },
     "sort-object-keys": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/sort-object-keys/-/sort-object-keys-1.1.3.tgz",
@@ -10473,6 +11327,32 @@
       "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
       "dev": true
     },
+    "sshpk": {
+      "version": "1.16.1",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/sshpk/-/sshpk-1.16.1.tgz",
+      "integrity": "sha512-HXXqVUq7+pcKeLqqZj6mHFUMvXtOJt1uoUx09pFW6011inTMxqI8BA8PM95myrIyyKwdnzjdFjLiE6KBPVtJIg==",
+      "dev": true,
+      "requires": {
+        "asn1": "~0.2.3",
+        "assert-plus": "^1.0.0",
+        "bcrypt-pbkdf": "^1.0.0",
+        "dashdash": "^1.12.0",
+        "ecc-jsbn": "~0.1.1",
+        "getpass": "^0.1.1",
+        "jsbn": "~0.1.0",
+        "safer-buffer": "^2.0.2",
+        "tweetnacl": "~0.14.0"
+      }
+    },
+    "ssri": {
+      "version": "5.3.0",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/ssri/-/ssri-5.3.0.tgz",
+      "integrity": "sha512-XRSIPqLij52MtgoQavH/x/dU1qVKtWUAAZeOHsR9c2Ddi4XerFy3mc1alf+dLJKl9EUIm/Ht+EowFkTUOA6GAQ==",
+      "dev": true,
+      "requires": {
+        "safe-buffer": "^5.1.1"
+      }
+    },
     "stack-utils": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/stack-utils/-/stack-utils-2.0.1.tgz",
@@ -10745,6 +11625,43 @@
         }
       }
     },
+    "tar": {
+      "version": "2.2.2",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/tar/-/tar-2.2.2.tgz",
+      "integrity": "sha512-FCEhQ/4rE1zYv9rYXJw/msRqsnmlje5jHP6huWeBZ704jUTy02c5AZyWujpMR1ax6mVw9NyJMfuK2CMDWVIfgA==",
+      "dev": true,
+      "requires": {
+        "block-stream": "*",
+        "fstream": "^1.0.12",
+        "inherits": "2"
+      }
+    },
+    "tar-stream": {
+      "version": "2.1.4",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/tar-stream/-/tar-stream-2.1.4.tgz",
+      "integrity": "sha512-o3pS2zlG4gxr67GmFYBLlq+dM8gyRGUOvsrHclSkvtVtQbjV0s/+ZE8OpICbaj8clrX3tjeHngYGP7rweaBnuw==",
+      "dev": true,
+      "requires": {
+        "bl": "^4.0.3",
+        "end-of-stream": "^1.4.1",
+        "fs-constants": "^1.0.0",
+        "inherits": "^2.0.3",
+        "readable-stream": "^3.1.1"
+      },
+      "dependencies": {
+        "readable-stream": {
+          "version": "3.6.0",
+          "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/readable-stream/-/readable-stream-3.6.0.tgz",
+          "integrity": "sha512-BViHy7LKeTz4oNnkcLJ+lVSL6vpiFeX6/d3oSH8zCW7UxP2onchk+vTGB143xuFjHS3deTgkKoXXymXqymiIdA==",
+          "dev": true,
+          "requires": {
+            "inherits": "^2.0.3",
+            "string_decoder": "^1.1.1",
+            "util-deprecate": "^1.0.1"
+          }
+        }
+      }
+    },
     "temp-dir": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/temp-dir/-/temp-dir-2.0.0.tgz",
@@ -10849,6 +11766,16 @@
         "is-number": "^7.0.0"
       }
     },
+    "tough-cookie": {
+      "version": "2.5.0",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/tough-cookie/-/tough-cookie-2.5.0.tgz",
+      "integrity": "sha512-nlLsUzgm1kfLXSXfRZMc1KLAugd4hqJHDTvc2hDIwS3mZAfMEuMbc03SujMF+GEcpaX/qboeycw6iO8JwVv2+g==",
+      "dev": true,
+      "requires": {
+        "psl": "^1.1.28",
+        "punycode": "^2.1.1"
+      }
+    },
     "traverse": {
       "version": "0.6.6",
       "resolved": "https://registry.npmjs.org/traverse/-/traverse-0.6.6.tgz",
@@ -10873,6 +11800,59 @@
       "integrity": "sha512-aZW88SY8kQbU7gpV19lN24LtXh/yD4ZZg6qieAJDDg+YBsJcSmLGK9QpnUjAKVG/xefmvJGd1WUmfpT/g6AJGA==",
       "dev": true
     },
+    "tslint": {
+      "version": "5.14.0",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/tslint/-/tslint-5.14.0.tgz",
+      "integrity": "sha512-IUla/ieHVnB8Le7LdQFRGlVJid2T/gaJe5VkjzRVSRR6pA2ODYrnfR1hmxi+5+au9l50jBwpbBL34txgv4NnTQ==",
+      "dev": true,
+      "requires": {
+        "babel-code-frame": "^6.22.0",
+        "builtin-modules": "^1.1.1",
+        "chalk": "^2.3.0",
+        "commander": "^2.12.1",
+        "diff": "^3.2.0",
+        "glob": "^7.1.1",
+        "js-yaml": "^3.7.0",
+        "minimatch": "^3.0.4",
+        "mkdirp": "^0.5.1",
+        "resolve": "^1.3.2",
+        "semver": "^5.3.0",
+        "tslib": "^1.8.0",
+        "tsutils": "^2.29.0"
+      },
+      "dependencies": {
+        "commander": {
+          "version": "2.20.3",
+          "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/commander/-/commander-2.20.3.tgz",
+          "integrity": "sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==",
+          "dev": true
+        }
+      }
+    },
+    "tsutils": {
+      "version": "2.29.0",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/tsutils/-/tsutils-2.29.0.tgz",
+      "integrity": "sha512-g5JVHCIJwzfISaXpXE1qvNalca5Jwob6FjI4AoPlqMusJ6ftFE7IkkFoMhVLRgK+4Kx3gkzb8UZK5t5yTTvEmA==",
+      "dev": true,
+      "requires": {
+        "tslib": "^1.8.1"
+      }
+    },
+    "tunnel-agent": {
+      "version": "0.6.0",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
+      "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
+      "dev": true,
+      "requires": {
+        "safe-buffer": "^5.0.1"
+      }
+    },
+    "tweetnacl": {
+      "version": "0.14.5",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/tweetnacl/-/tweetnacl-0.14.5.tgz",
+      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
+      "dev": true
+    },
     "type-check": {
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
@@ -10888,6 +11868,12 @@
       "integrity": "sha512-4dbzIzqvjtgiM5rw1k5rEHtBANKmdudhGyBEajN01fEyhaAIhsoKNy6y7+IN93IfpFtwY9iqi7kD+xwKhQsNJA==",
       "dev": true
     },
+    "typedarray": {
+      "version": "0.0.6",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/typedarray/-/typedarray-0.0.6.tgz",
+      "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
+      "dev": true
+    },
     "typedarray-to-buffer": {
       "version": "3.1.5",
       "resolved": "https://registry.npmjs.org/typedarray-to-buffer/-/typedarray-to-buffer-3.1.5.tgz",
@@ -10897,6 +11883,12 @@
         "is-typedarray": "^1.0.0"
       }
     },
+    "typescript": {
+      "version": "4.0.5",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/typescript/-/typescript-4.0.5.tgz",
+      "integrity": "sha512-ywmr/VrTVCmNTJ6iV2LwIrfG1P+lv6luD8sUJs+2eI9NLGigaN+nUQc13iHqisq7bra9lnmUSYqbJvegraBOPQ==",
+      "dev": true
+    },
     "uglify-js": {
       "version": "3.9.1",
       "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.9.1.tgz",
@@ -11065,6 +12057,26 @@
         "spdx-expression-parse": "^3.0.0"
       }
     },
+    "validate-npm-package-name": {
+      "version": "3.0.0",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/validate-npm-package-name/-/validate-npm-package-name-3.0.0.tgz",
+      "integrity": "sha1-X6kS2B630MdK/BQN5zF/DKffQ34=",
+      "dev": true,
+      "requires": {
+        "builtins": "^1.0.3"
+      }
+    },
+    "verror": {
+      "version": "1.10.0",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/verror/-/verror-1.10.0.tgz",
+      "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
+      "dev": true,
+      "requires": {
+        "assert-plus": "^1.0.0",
+        "core-util-is": "1.0.2",
+        "extsprintf": "^1.2.0"
+      }
+    },
     "wcwidth": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/wcwidth/-/wcwidth-1.0.1.tgz",
@@ -11101,6 +12113,53 @@
       "integrity": "sha1-Zws6+8VS4LVd9rd4DKdGFfI60cs=",
       "dev": true
     },
+    "wide-align": {
+      "version": "1.1.3",
+      "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/wide-align/-/wide-align-1.1.3.tgz",
+      "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "string-width": "^1.0.2 || 2"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "3.0.0",
+          "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/ansi-regex/-/ansi-regex-3.0.0.tgz",
+          "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
+          "dev": true,
+          "optional": true
+        },
+        "is-fullwidth-code-point": {
+          "version": "2.0.0",
+          "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
+          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
+          "dev": true,
+          "optional": true
+        },
+        "string-width": {
+          "version": "2.1.1",
+          "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/string-width/-/string-width-2.1.1.tgz",
+          "integrity": "sha512-nOqH59deCq9SRHlxq1Aw85Jnt4w6KvLKqWVik6oA9ZklXLNIOlqg4F2yrT1MVaTjAqvVwdfeZ7w7aCvJD7ugkw==",
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^4.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "4.0.0",
+          "resolved": "https://nexus.core.cvent.org/nexus/repository/npm-public/strip-ansi/-/strip-ansi-4.0.0.tgz",
+          "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "ansi-regex": "^3.0.0"
+          }
+        }
+      }
+    },
     "widest-line": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/widest-line/-/widest-line-3.1.0.tgz",
diff --git a/package.json b/package.json
index d03c8ec0..d02a5b2b 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,7 @@
     "lint": "eslint .",
     "semantic-release": "semantic-release",
     "sort-package-json": "node cli.js package.json --check",
-    "test": "ava",
+    "test": "ava && dtslint --localTs node_modules/typescript/lib",
     "test-coverage": "nyc ava",
     "update-snapshot": "ava -u && node cli.js package.json"
   },
@@ -84,6 +84,7 @@
     "ava": "3.5.1",
     "del": "5.1.0",
     "dot-prop": "^5.2.0",
+    "dtslint": "^4.0.5",
     "eslint": "^6.8.0",
     "eslint-config-prettier": "^6.10.0",
     "eslint-config-standard": "^14.1.0",
@@ -98,6 +99,7 @@
     "nyc": "^15.0.0",
     "prettier": "^2.0.4",
     "semantic-release": "17.0.5",
-    "tempy": "0.4.0"
+    "tempy": "0.4.0",
+    "typescript": "^4.0.5"
   }
 }
diff --git a/tests/scripts.js b/tests/scripts.js
index 0acde8b5..bdedebdf 100644
--- a/tests/scripts.js
+++ b/tests/scripts.js
@@ -7,6 +7,7 @@ const fixture = {
   watch: 'watch things',
   prewatch: 'echo "about to watch"',
   postinstall: 'echo "Installed"',
+  preinstall: 'echo "Installing"',
   start: 'node server.js',
   posttest: 'abc',
   pretest: 'xyz',
@@ -18,25 +19,26 @@ const fixture = {
 }
 
 const expect = {
-  postinstall: 'echo "Installed"',
-  multiply: '2 * 3',
-  'pre-fetch-info': 'foo',
-  prepare: 'npm run build',
-  preprettier: 'echo "not pretty"',
-  prettier: 'prettier -l "**/*.js"',
-  postprettier: 'echo "so pretty"',
-  start: 'node server.js',
   pretest: 'xyz',
   test: 'node test.js',
   posttest: 'abc',
+  multiply: '2 * 3',
   prewatch: 'echo "about to watch"',
   watch: 'watch things',
+  preinstall: 'echo "Installing"',
+  postinstall: 'echo "Installed"',
+  start: 'node server.js',
+  preprettier: 'echo "not pretty"',
+  prettier: 'prettier -l "**/*.js"',
+  postprettier: 'echo "so pretty"',
+  prepare: 'npm run build',
+  'pre-fetch-info': 'foo',
 }
 
 for (const field of ['scripts', 'betterScripts']) {
   test(field, macro.sortObject, {
     path: field,
     value: fixture,
-    expect: expect,
+    expect,
   })
 }
diff --git a/tests/types.ts b/tests/types.ts
new file mode 100644
index 00000000..30dd1262
--- /dev/null
+++ b/tests/types.ts
@@ -0,0 +1,30 @@
+import sortPackageJson, {
+  sortPackageJson as nestedSorter,
+} from 'sort-package-json'
+
+// $ExpectType { a: string; }
+nestedSorter({ a: '' })
+
+// $ExpectType { a: string; }
+sortPackageJson({ a: '' })
+
+// $ExpectType string
+sortPackageJson('{}')
+
+// $ExpectError
+sortPackageJson(1)
+
+// $ExpectType string
+sortPackageJson('{}', {
+  sortOrder: ['a', 'b'],
+})
+
+// $ExpectType string
+sortPackageJson('{}', {
+  sortOrder: (a, b) => 2,
+})
+
+// $ExpectError
+sortPackageJson('{}', {
+  sortOrder: (a, b) => 'not a number',
+})
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 00000000..7cc436f7
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,16 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": ["es6"],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "noEmit": true,
+
+        // If the library is an external module (uses `export`), this allows your test file to import "mylib" instead of "./index".
+        // If the library is global (cannot be imported via `import` or `require`), leave this out.
+        "baseUrl": ".",
+        "paths": { "sort-package-json": ["."] }
+    }
+}
\ No newline at end of file
diff --git a/tslint.json b/tslint.json
new file mode 100644
index 00000000..29fa58a9
--- /dev/null
+++ b/tslint.json
@@ -0,0 +1,6 @@
+{
+    "extends": "dtslint/dtslint.json", // Or "dtslint/dt.json" if on DefinitelyTyped
+    "rules": {
+        "semicolon": false
+    }
+}
\ No newline at end of file