Utilities to get and check variable types (isString, isPlainObject, isRegExp, etc)

Why should I use this instead of say instanceof?

Under certain circumstances instanceof may not return the correct results. This occurs with node's vm module 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!

Complete API Documentation.

• Install: npm install --save typechecker
• Import: import * as pkg from ('typechecker')
• Require: const pkg = require('typechecker')

import * as pkg from 'https://unpkg.com/typechecker@^9.4.0/edition-deno/index.ts'

<script type="module">
    import * as pkg from '//cdn.skypack.dev/typechecker@^9.4.0'
</script>

<script type="module">
    import * as pkg from '//unpkg.com/typechecker@^9.4.0'
</script>

<script type="module">
    import * as pkg from '//dev.jspm.io/[email protected]'
</script>

This package is published with the following editions:

• typechecker aliases typechecker/index.cjs which uses the Editions Autoloader to automatically select the correct edition for the consumer's environment
• typechecker/source/index.ts is TypeScript source code with Import for modules
• typechecker/edition-browsers/index.js is TypeScript compiled against ES2022 for web browsers with Import for modules
• typechecker/edition-es2022/index.js is TypeScript compiled against ES2022 for Node.js 6 || 8 || 10 || 12 || 14 || 16 || 18 || 20 || 21 with Require for modules
• typechecker/edition-es5/index.js is TypeScript compiled against ES5 for Node.js 4 || 6 || 8 || 10 || 12 || 14 || 16 || 18 || 20 || 21 with Require for modules
• typechecker/edition-es2022-esm/index.js is TypeScript compiled against ES2022 for Node.js 12 || 14 || 16 || 18 || 20 || 21 with Import for modules
• typechecker/edition-types/index.d.ts is TypeScript compiled Types with Import for modules
• typechecker/edition-deno/index.ts is TypeScript source code made to be compatible with Deno

Discover the release history by heading on over to the HISTORY.md file.

Discover how to contribute via the CONTRIBUTING.md file.

• Benjamin Lupton — Accelerating collaborative wisdom.

• Benjamin Lupton — Accelerating collaborative wisdom.

• Benjamin Lupton — view contributions
• Joe Gesualdo — view contributions
• Matt Bierner — view contributions
• Sean Fridman — view contributions

• Andrew Nesbitt — Software engineer and researcher
• Balsa — We're Balsa, and we're building tools for builders.
• Codecov — Empower developers with tools to improve code quality and testing.
• Poonacha Medappa
• Rob Morris
• Sentry — Real-time crash reporting for your web apps, mobile apps, and games.
• Syntax — Syntax Podcast

• Andrew Nesbitt
• Armen Mkrtchian
• Balsa
• Chad
• Codecov
• dr.dimitru
• Elliott Ditman
• entroniq
• GitHub
• Hunter Beast
• Jean-Luc Geering
• Michael Duane Mooring
• Michael Harry Scepaniak
• Mohammed Shah
• Mr. Henry
• Nermal
• Pleo
• Poonacha Medappa
• Rob Morris
• Robert de Forest
• Sentry
• ServieJS
• Skunk Team
• Syntax
• WriterJohnBuck

Unless stated otherwise all works are:

• Copyright © Benjamin Lupton

and licensed under:

• Artistic License 2.0