{"id":23902415,"url":"https://github.com/bevry/typechecker","last_synced_at":"2025-05-16T13:02:58.786Z","repository":{"id":7684126,"uuid":"9047352","full_name":"bevry/typechecker","owner":"bevry","description":"Utilities to get and check variable types (isString, isPlainObject, isRegExp, 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TITLE/ --\u003e\n\n# TypeChecker\n\n\u003c!-- /TITLE --\u003e\n\n\u003c!-- BADGES/ --\u003e\n\n\u003cspan class=\"badge-githubworkflow\"\u003e\u003ca href=\"https://github.com/bevry/typechecker/actions?query=workflow%3Abevry\" title=\"View the status of this project's GitHub Workflow: bevry\"\u003e\u003cimg src=\"https://github.com/bevry/typechecker/workflows/bevry/badge.svg\" alt=\"Status of the GitHub Workflow: bevry\" /\u003e\u003c/a\u003e\u003c/span\u003e\n\u003cspan class=\"badge-npmversion\"\u003e\u003ca href=\"https://npmjs.org/package/typechecker\" title=\"View this project on NPM\"\u003e\u003cimg src=\"https://img.shields.io/npm/v/typechecker.svg\" alt=\"NPM version\" /\u003e\u003c/a\u003e\u003c/span\u003e\n\u003cspan class=\"badge-npmdownloads\"\u003e\u003ca href=\"https://npmjs.org/package/typechecker\" title=\"View this project on NPM\"\u003e\u003cimg src=\"https://img.shields.io/npm/dm/typechecker.svg\" alt=\"NPM downloads\" /\u003e\u003c/a\u003e\u003c/span\u003e\n\u003cbr class=\"badge-separator\" /\u003e\n\u003cspan class=\"badge-githubsponsors\"\u003e\u003ca href=\"https://github.com/sponsors/balupton\" title=\"Donate to this project using GitHub Sponsors\"\u003e\u003cimg src=\"https://img.shields.io/badge/github-donate-yellow.svg\" alt=\"GitHub Sponsors donate button\" /\u003e\u003c/a\u003e\u003c/span\u003e\n\u003cspan class=\"badge-thanksdev\"\u003e\u003ca href=\"https://thanks.dev/u/gh/bevry\" title=\"Donate to this project using ThanksDev\"\u003e\u003cimg src=\"https://img.shields.io/badge/thanksdev-donate-yellow.svg\" alt=\"ThanksDev donate button\" /\u003e\u003c/a\u003e\u003c/span\u003e\n\u003cspan class=\"badge-patreon\"\u003e\u003ca href=\"https://patreon.com/bevry\" title=\"Donate to this project using Patreon\"\u003e\u003cimg src=\"https://img.shields.io/badge/patreon-donate-yellow.svg\" alt=\"Patreon donate button\" /\u003e\u003c/a\u003e\u003c/span\u003e\n\u003cspan class=\"badge-liberapay\"\u003e\u003ca href=\"https://liberapay.com/bevry\" title=\"Donate to this project using Liberapay\"\u003e\u003cimg src=\"https://img.shields.io/badge/liberapay-donate-yellow.svg\" alt=\"Liberapay donate button\" /\u003e\u003c/a\u003e\u003c/span\u003e\n\u003cspan class=\"badge-buymeacoffee\"\u003e\u003ca href=\"https://buymeacoffee.com/balupton\" title=\"Donate to this project using Buy Me A Coffee\"\u003e\u003cimg src=\"https://img.shields.io/badge/buy%20me%20a%20coffee-donate-yellow.svg\" alt=\"Buy Me A Coffee donate button\" /\u003e\u003c/a\u003e\u003c/span\u003e\n\u003cspan class=\"badge-opencollective\"\u003e\u003ca href=\"https://opencollective.com/bevry\" title=\"Donate to this project using Open Collective\"\u003e\u003cimg src=\"https://img.shields.io/badge/open%20collective-donate-yellow.svg\" alt=\"Open Collective donate button\" /\u003e\u003c/a\u003e\u003c/span\u003e\n\u003cspan class=\"badge-crypto\"\u003e\u003ca href=\"https://bevry.me/crypto\" title=\"Donate to this project using Cryptocurrency\"\u003e\u003cimg 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community badge\" /\u003e\u003c/a\u003e\u003c/span\u003e\n\n\u003c!-- /BADGES --\u003e\n\n\u003c!-- DESCRIPTION/ --\u003e\n\nUtilities to get and check variable types (isString, isPlainObject, isRegExp, etc)\n\n\u003c!-- /DESCRIPTION --\u003e\n\n\n## Why?\n\nWhy should I use this instead of say `instanceof`?\n\nUnder certain circumstances `instanceof` may not return the correct results. This occurs with [node's vm module](http://nodejs.org/api/vm.html#vm_globals) especially, and circumstances where an object's prototype has been dereferenced from the original. As such, for basic `==` and `===` checks (like `a === null`), you're fine not using this, but for checks when you would have done `instanceof` (like `err instanceof Error`), you should try to use this instead. Plus things like `isPlainObject` are darn useful!\n\n## Usage\n\n[Complete API Documentation.](http://master.typechecker.bevry.surge.sh/docs/)\n\n\u003c!-- INSTALL/ --\u003e\n\n## Install\n\n### [npm](https://npmjs.com \"npm is a package manager for javascript\")\n\n-   Install: `npm install --save typechecker`\n-   Import: `import * as pkg from ('typechecker')`\n-   Require: `const pkg = require('typechecker')`\n\n### [Deno](https://deno.land \"Deno is a secure runtime for JavaScript and TypeScript, it is an alternative for Node.js\")\n\n``` typescript\nimport * as pkg from 'https://unpkg.com/typechecker@^9.4.0/edition-deno/index.ts'\n```\n### [Skypack](https://www.skypack.dev \"Skypack is a JavaScript Delivery Network for modern web apps\")\n\n``` html\n\u003cscript type=\"module\"\u003e\n    import * as pkg from '//cdn.skypack.dev/typechecker@^9.4.0'\n\u003c/script\u003e\n```\n### [unpkg](https://unpkg.com \"unpkg is a fast, global content delivery network for everything on npm\")\n\n``` html\n\u003cscript type=\"module\"\u003e\n    import * as pkg from '//unpkg.com/typechecker@^9.4.0'\n\u003c/script\u003e\n```\n### [jspm](https://jspm.io \"Native ES Modules CDN\")\n\n``` html\n\u003cscript type=\"module\"\u003e\n    import * as pkg from '//dev.jspm.io/typechecker@9.4.0'\n\u003c/script\u003e\n```\n### [Editions](https://editions.bevry.me \"Editions are the best way to produce and consume packages you care about.\")\n\nThis package is published with the following editions:\n-   `typechecker` aliases `typechecker/index.cjs` which uses the [Editions Autoloader](https://github.com/bevry/editions \"You can use the Editions Autoloader to autoload the appropriate edition for your consumers environment\") to automatically select the correct edition for the consumer's environment\n-   `typechecker/source/index.ts` is [TypeScript](https://www.typescriptlang.org/ \"TypeScript is a typed superset of JavaScript that compiles to plain JavaScript.\") source code with [Import](https://babeljs.io/docs/learn-es2015/#modules \"ECMAScript Modules\") for modules\n-   `typechecker/edition-browsers/index.js` is [TypeScript](https://www.typescriptlang.org/ \"TypeScript is a typed superset of JavaScript that compiles to plain JavaScript.\") compiled against [ES2022](https://en.wikipedia.org/wiki/ES2022 \"ECMAScript 2022\") for web browsers with [Import](https://babeljs.io/docs/learn-es2015/#modules \"ECMAScript Modules\") for modules\n-   `typechecker/edition-es2022/index.js` is [TypeScript](https://www.typescriptlang.org/ \"TypeScript is a typed superset of JavaScript that compiles to plain JavaScript.\") compiled against [ES2022](https://en.wikipedia.org/wiki/ES2022 \"ECMAScript 2022\") for [Node.js](https://nodejs.org \"Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine\") 6 || 8 || 10 || 12 || 14 || 16 || 18 || 20 || 21 with [Require](https://nodejs.org/dist/latest-v5.x/docs/api/modules.html \"Node/CJS Modules\") for modules\n-   `typechecker/edition-es5/index.js` is [TypeScript](https://www.typescriptlang.org/ \"TypeScript is a typed superset of JavaScript that compiles to plain JavaScript.\") compiled against ES5 for [Node.js](https://nodejs.org \"Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine\") 4 || 6 || 8 || 10 || 12 || 14 || 16 || 18 || 20 || 21 with [Require](https://nodejs.org/dist/latest-v5.x/docs/api/modules.html \"Node/CJS Modules\") for modules\n-   `typechecker/edition-es2022-esm/index.js` is [TypeScript](https://www.typescriptlang.org/ \"TypeScript is a typed superset of JavaScript that compiles to plain JavaScript.\") compiled against [ES2022](https://en.wikipedia.org/wiki/ES2022 \"ECMAScript 2022\") for [Node.js](https://nodejs.org \"Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine\") 12 || 14 || 16 || 18 || 20 || 21 with [Import](https://babeljs.io/docs/learn-es2015/#modules \"ECMAScript Modules\") for modules\n-   `typechecker/edition-types/index.d.ts` is [TypeScript](https://www.typescriptlang.org/ \"TypeScript is a typed superset of JavaScript that compiles to plain JavaScript.\") compiled Types with [Import](https://babeljs.io/docs/learn-es2015/#modules \"ECMAScript Modules\") for modules\n-   `typechecker/edition-deno/index.ts` is [TypeScript](https://www.typescriptlang.org/ \"TypeScript is a typed superset of JavaScript that compiles to plain JavaScript.\") source code made to be compatible with [Deno](https://deno.land \"Deno is a secure runtime for JavaScript and TypeScript, it is an alternative to Node.js\")\n\n\u003c!-- /INSTALL --\u003e\n\n\u003c!-- HISTORY/ --\u003e\n\n## History\n\n[Discover the release history by heading on over to the `HISTORY.md` file.](https://github.com/bevry/typechecker/blob/HEAD/HISTORY.md#files)\n\n\u003c!-- /HISTORY --\u003e\n\n\u003c!-- BACKERS/ --\u003e\n\n## Backers\n\n### Code\n\n[Discover how to contribute via the `CONTRIBUTING.md` file.](https://github.com/bevry/typechecker/blob/HEAD/CONTRIBUTING.md#files)\n\n#### Authors\n\n-   [Benjamin Lupton](https://balupton.com) — Accelerating collaborative wisdom.\n\n#### Maintainers\n\n-   [Benjamin Lupton](https://balupton.com) — Accelerating collaborative wisdom.\n\n#### Contributors\n\n-   [Benjamin Lupton](https://github.com/balupton) — [view contributions](https://github.com/bevry/typechecker/commits?author=balupton \"View the GitHub contributions of Benjamin Lupton on repository bevry/typechecker\")\n-   [Joe Gesualdo](https://github.com/joegesualdo) — [view contributions](https://github.com/bevry/typechecker/commits?author=joegesualdo \"View the GitHub contributions of Joe Gesualdo on repository bevry/typechecker\")\n-   [Matt Bierner](https://github.com/mjbvz) — [view contributions](https://github.com/bevry/typechecker/commits?author=mjbvz \"View the GitHub contributions of Matt Bierner on repository bevry/typechecker\")\n-   [Sean Fridman](https://github.com/sfrdmn) — [view contributions](https://github.com/bevry/typechecker/commits?author=sfrdmn \"View the GitHub contributions of Sean Fridman on repository bevry/typechecker\")\n\n### Finances\n\n\u003cspan class=\"badge-githubsponsors\"\u003e\u003ca href=\"https://github.com/sponsors/balupton\" title=\"Donate to this project using GitHub Sponsors\"\u003e\u003cimg src=\"https://img.shields.io/badge/github-donate-yellow.svg\" alt=\"GitHub Sponsors donate button\" /\u003e\u003c/a\u003e\u003c/span\u003e\n\u003cspan class=\"badge-thanksdev\"\u003e\u003ca href=\"https://thanks.dev/u/gh/bevry\" title=\"Donate to this project using ThanksDev\"\u003e\u003cimg src=\"https://img.shields.io/badge/thanksdev-donate-yellow.svg\" alt=\"ThanksDev donate button\" /\u003e\u003c/a\u003e\u003c/span\u003e\n\u003cspan class=\"badge-patreon\"\u003e\u003ca href=\"https://patreon.com/bevry\" title=\"Donate to this project using Patreon\"\u003e\u003cimg src=\"https://img.shields.io/badge/patreon-donate-yellow.svg\" alt=\"Patreon donate button\" /\u003e\u003c/a\u003e\u003c/span\u003e\n\u003cspan class=\"badge-liberapay\"\u003e\u003ca href=\"https://liberapay.com/bevry\" title=\"Donate to this project using Liberapay\"\u003e\u003cimg src=\"https://img.shields.io/badge/liberapay-donate-yellow.svg\" alt=\"Liberapay donate button\" /\u003e\u003c/a\u003e\u003c/span\u003e\n\u003cspan class=\"badge-buymeacoffee\"\u003e\u003ca href=\"https://buymeacoffee.com/balupton\" title=\"Donate to this project using Buy Me A Coffee\"\u003e\u003cimg src=\"https://img.shields.io/badge/buy%20me%20a%20coffee-donate-yellow.svg\" alt=\"Buy Me A Coffee donate button\" /\u003e\u003c/a\u003e\u003c/span\u003e\n\u003cspan class=\"badge-opencollective\"\u003e\u003ca href=\"https://opencollective.com/bevry\" title=\"Donate to this project using Open Collective\"\u003e\u003cimg src=\"https://img.shields.io/badge/open%20collective-donate-yellow.svg\" alt=\"Open Collective donate button\" /\u003e\u003c/a\u003e\u003c/span\u003e\n\u003cspan class=\"badge-crypto\"\u003e\u003ca href=\"https://bevry.me/crypto\" title=\"Donate to this project using Cryptocurrency\"\u003e\u003cimg src=\"https://img.shields.io/badge/crypto-donate-yellow.svg\" alt=\"crypto donate button\" /\u003e\u003c/a\u003e\u003c/span\u003e\n\u003cspan class=\"badge-paypal\"\u003e\u003ca href=\"https://bevry.me/paypal\" title=\"Donate to this project using Paypal\"\u003e\u003cimg src=\"https://img.shields.io/badge/paypal-donate-yellow.svg\" alt=\"PayPal donate button\" /\u003e\u003c/a\u003e\u003c/span\u003e\n\n#### Sponsors\n\n-   [Andrew Nesbitt](https://nesbitt.io) — Software engineer and researcher\n-   [Balsa](https://balsa.com) — We're Balsa, and we're building tools for builders.\n-   [Codecov](https://codecov.io) — Empower developers with tools to improve code quality and testing.\n-   [Poonacha Medappa](https://poonachamedappa.com)\n-   [Rob Morris](https://github.com/Rob-Morris)\n-   [Sentry](https://sentry.io) — Real-time crash reporting for your web apps, mobile apps, and games.\n-   [Syntax](https://syntax.fm) — Syntax Podcast\n\n#### Donors\n\n-   [Andrew Nesbitt](https://nesbitt.io)\n-   [Armen Mkrtchian](https://mogoni.dev)\n-   [Balsa](https://balsa.com)\n-   [Chad](https://opencollective.com/chad8)\n-   [Codecov](https://codecov.io)\n-   [dr.dimitru](https://veliovgroup.com)\n-   [Elliott Ditman](https://elliottditman.com)\n-   [entroniq](https://gitlab.com/entroniq)\n-   [GitHub](https://github.com/about)\n-   [Hunter Beast](https://cryptoquick.com)\n-   [Jean-Luc Geering](https://github.com/jlgeering)\n-   [Michael Duane Mooring](https://mdm.cc)\n-   [Michael Harry Scepaniak](https://michaelscepaniak.com)\n-   [Mohammed Shah](https://github.com/smashah)\n-   [Mr. Henry](https://mrhenry.be)\n-   [Nermal](https://arjunaditya.vercel.app)\n-   [Pleo](https://www.pleo.io)\n-   [Poonacha Medappa](https://poonachamedappa.com)\n-   [Rob Morris](https://github.com/Rob-Morris)\n-   [Robert de Forest](https://github.com/rdeforest)\n-   [Sentry](https://sentry.io)\n-   [ServieJS](https://github.com/serviejs)\n-   [Skunk Team](https://skunk.team)\n-   [Syntax](https://syntax.fm)\n-   [WriterJohnBuck](https://github.com/WriterJohnBuck)\n\n\u003c!-- /BACKERS --\u003e\n\n\u003c!-- LICENSE/ --\u003e\n\n## License\n\nUnless stated otherwise all works are:\n\n-   Copyright \u0026copy; [Benjamin Lupton](https://balupton.com)\n\nand licensed under:\n\n-   [Artistic License 2.0](http://spdx.org/licenses/Artistic-2.0.html)\n\n\u003c!-- /LICENSE --\u003e\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fbevry%2Ftypechecker","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fbevry%2Ftypechecker","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fbevry%2Ftypechecker/lists"}