Nondeterministic Programming Methodology


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3.0.1 • Public • Published

is-kindof The MIT License npm downloads

Check type of given javascript value. Support promises, generators, streams, and native types. Built on kind-of lib.

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Install with npm

$ npm i is-kindof --save


For more use-cases see the tests

var is = require('is-kindof')
is.array([1, 2]) // => true
is.boolean(true) // => true
is.buffer(new Buffer('foo')) // => true Date()) // => true
is.error(new Error('foo')) // => true
is.function(function noop () {}) // => true
is.generator((function * gen () { yield 42 })()) // => true
is.generatorfunction(function * genFn () {}) // => true Map()) // => true
is.null(null) // => true
is.number(123) // => true
is.object({ a: 'b' }) // => true
is.promise(Promise.resolve(123)) // => true
is.regexp(new RegExp('aa')) // => true
is.set(new Set()) // => true // => true
is.string('fooo') // => true
is.symbol(Symbol()) // => true
is.undefined(undefined) // => true
is.weakmap(new WeakMap()) // => true
is.weakset(new WeakSet()) // => true


  • always-done: Handle completion and errors with elegance! Support for streams, callbacks, promises, child processes, async/await and sync functions. A drop-in replacement for async-done - pass 100… more | homepage
  • is-async-function: Is function really asynchronous function? Trying to guess that based on check if common-callback-names exists as function arguments names or you can pass your custom. | homepage
  • is-callback-function: Returns true if function is a callback. Checks its name is one of common-callback-names - callback, cb, cb_, callback_, next, done, they can be customized… more | homepage
  • kind-of-extra: Additional functionality to kind-of type check utility. Support promises, generators, streams, errors. | homepage
  • kind-of-types: List of all javascript types. Used and useful for checking, validation, sanitizing and testing. Like isStream, isPromise, isWeakset and etc. | homepage
  • kind-of: Get the native type of a value. | homepage
  • minibase: MiniBase is minimalist approach to Base - @node-base, the awesome framework. Foundation for building complex APIs with small units called plugins. Works well with most… more | homepage
  • mukla: Small, parallel and fast test framework with suppport for async/await, promises, callbacks, streams and observables. Targets and works at node.js v0.10 and above. | homepage
  • to-callback: Converts result-first callbacks to classic (node.js-style) error-first callbacks with 3 lines of code. Useful when you want to promisify result-first APIs (like emitter.on). Inspired by… more | homepage


Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.
But before doing anything, please read the guidelines.

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