JSPM

Type check values

Error constructor for test and validation frameworks that implements standardized AssertionError specification.

BDD/TDD assertion library for node.js and the browser. Test framework agnostic.

simple, flexible, fun test framework

Lazy assertions without performance penalty

TypeScript implementation of invariant(condition, message)

A tiny javascript type testing tool

Function argument validation for humans

Node.js test runner that lets you develop with confidence.

Test if an object has a specified property.

Test if a value is object-like.

Test if a value is an array.

Test if a value is a regular expression.

Test if a double-precision floating-point numeric value is NaN.

Test if a value is a string.

Check if an environment is big endian.

Check two valid geojson geometries for equality.

Test if a double-precision floating-point numeric value is infinite.

Check two valid geojson geometries for equality.

Test if a value is a boolean.

Test if a value is a function.

Test if a value is a Float64Array.

Test if a value is a Buffer object.

Test if a value is a regular expression string.

Test if a value is a plain object.

Test if a value is a Uint32Array.

Test if a value is a Uint8Array.

Test if a value is a Uint16Array.

Test if a value is an object.

Test if a value is a number.

Test if a value is a Float32Array.

Check if an environment is little endian.

The powerful, easy-to-use testing framework.

Power Assert feature enhancer for assert function/object

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

ESLint rules for AVA

Assertion toolkit for Puppeteer.

Automated browser testing for the modern web development stack.

Power Assert in JavaScript

Power Assert output formatter

Power Assert feature enhancer for assert function/object

A tiny runtime library for type assertions

Chai plugin for JSON Schema v4

Babel plugin for power-assert

A port of Node v6's internal _deepEqual function in a universal style

Yet another JavaScript assertion/invariant library.

Chai assertion that provides Jest's snapshot testing

Power Assert instrumentor from source to source, with source-map

Power Assert feature instrumentor based on the ECMAScript AST

A forked of Chai 5 which adds Promise support in order to work with Nightwatch commands.

Babel plugin for protecting against improper use of `t.throws()` in AVA

Power Assert feature instrumentor on the fly

DOM assertions for the Chai assertion library using vanilla JavaScript

Convert assert to power-assert on ESTree AST

Shallow deep equal assertion for chai

Test if a finite numeric value is an odd number.

Test if a finite double-precision floating-point number is an integer.

Test if a double-precision floating-point numeric value is positive zero.

Test if a value is NaN.

Assert that the name of the current branch of a git repository has a particular value.

Assertion library for form validations

Test if a value is a number having a nonnegative integer value.

Checks a given object against a given set of specifications to keep you from writing boilerplate tests.

Test if a finite numeric value is an even number.

Test if a value is an Int32Array.

Test if a value is a number having an integer value.

Encourages programming with assertions by providing tools to compile them away

Test if a value is a Uint8ClampedArray.

Test if a value is an Int16Array.

Assert utility from yeoman

Test if a value is a collection.

Test if a double-precision floating-point numeric value is negative zero.

Test if an object's own property is enumerable.

Assert a given object is a valid glob option

Extensible BDD assertion toolkit

Test if a value is an Int8Array.

Babel plugin for protecting against improper use of `t.throws()` in AVA

Test if a value is an arguments object.

Browserify transform for unassert: Encourages programming with assertions by providing tools to compile them away

Test if a value is a number having a positive integer value.

assertion library

Color assertions for chai

Test if a value is an Error object.

Checks a given object against a given set of specifications to keep you from writing boilerplate tests.

Standard assertion utilities.

provides snapshot testing like jest

Minimal JavaScript type checking library

Test whether a value has in its prototype chain a specified constructor as a prototype property.

Test if a value is an ArrayBuffer.

Plugin for validating API schemas from API documentation

Xml assertions for Chai

Test if a value is a complex number-like object.

Power Assert output renderers

Extends chai with assertions that allow for floating point rounding errors

Test if a value is a number having a positive value.

Expect-like assertions that works seamlessly in node and browsers

Change assertions for the Chai assertion library

Test if a value is an array-like object.

Test if a value is a Complex64Array.

Test if a value is array-like.

Type check values: `is.string('🦄') //=> true`

jQuery assertions for the Chai assertion library

Test if a value is a typed array.

Test if a value is a complex typed array.

Test if an array-like object supports the accessor (get/set) protocol.

A chai assertion plugin for working with urls

Unexpected plugin for the messy library

Test if a value is a Complex128Array.

Backbone assertions for the Chai assertion library

[![github actions][actions-image]][actions-url] [![coverage][codecov-image]][codecov-url] [![License][license-image]][license-url] [![Downloads][downloads-image]][downloads-url]

Test if a finite double-precision floating-point number is a nonnegative integer.

Test if a value is an array-like object of numbers.

Ergonomic, modern and type-safe assertion library

Testing and assertion library with friendly BDD syntax — awesome.must.be.true(). Many expressive matchers and is test runner and framework agnostic. Follows RFC 2119 with its use of MUST. Good and well tested stuff.

Test if a value is typed-array-like.

This module extends the [Unexpected](https://github.com/unexpectedjs/unexpected) assertion library with integration for the [Sinonjs](http://sinonjs.org/) mocking library.

Test if a finite double-precision floating-point number is a negative integer.

A chai plugin to validate json files

Chai assertions for Node.js filesystem

Test if a value is a probability.

[![github actions][actions-image]][actions-url] [![coverage][codecov-image]][codecov-url] [![dependency status][deps-svg]][deps-url] [![dev dependency status][dev-deps-svg]][dev-deps-url] [![License][license-image]][license-url] [![Downloads][downloads-im

Common assertions for Bats

Test if an array-like value contains a search value.

Assert on equality of json representations in Chai

Adding .also chain in base library of chai-as-promised

DOM plugin for the unexpected assertion libary

Test if a finite double-precision floating-point number is a positive integer.

Simple, intuitive and flexible unit testing framework for javascript / Node.js (browser and server). Integrates awesome assertions libraries like Must.js, Should.js, Assert of Node.js, Sinon.js and other friendly features (promise, IoC, plugins, ...).

Test if a double-precision floating-point number is a probability.

Test if a value is an array-like object containing only nonnegative integers.

Drop-in replacement for expect that waits for the assertion to succeed (retries on an interval you choose, until a timeout you choose)

Validation utilities

Test if a value is an array of strings.

HTML assertions for Chai.

Test if a value is a number having a nonnegative value.

🐷 Poku makes testing easy for Node.js, Bun, Deno, and you at the same time.

Type check values. This is a fork of sindresorhus/is, but with CommonJS support.

Test if a value is Node writable stream-like.

Test if a value is an array of probabilities that sum to one.

Check if the runtime is Node.js.

Check if the runtime is a web browser.

Test if a value is Node stream-like.

Assert that a Node-API value is a specified Node-API data type.

Test if a value is null.

Because expected true, result false is not enough!

Add support to Unexpected for testing Map instances

Add support to Unexpected for testing Set instances

Test if a value is a DataView.

Assert that a Node-API value is a Node-API typed array.

Assert that two Node-API typed array data types are equal.

C utilities for asserting that a Node-API call returns an "ok" status.

Assert that two Node-API data types are equal.

Determine if a buffer length is compatible with provided ndarray meta data.

An assertion library for cucumber.js providing cucumber compatible failures instead of exceptions

Test if an object has a specified method name, either own or inherited.

Test if a value is ndarray-like.

Assert values using Joi schemas

Strong Dynamically Typed Object Modeling for JavaScript

Test if a value is an array-like object containing only integers.

the lightest yet the fastest javascript testing library

A Chai plugin providing assertions on the order of Sinon spy calls

complex type validators that generate TypeScript and Flow types for you

Test if a value is a URI.

This module extends the [Unexpected](https://github.com/unexpectedjs/unexpected) assertion library with integration for [Knockout](http://knockoutjs.org).

Test if value is valid for fs.readFile option

A Cypress plugin to recursively search your intercepted requests/responses by key/value

node.js streams plugin for the Unexpected assertion library

Preconditions for safe coding

Extends Tape with new assertions

Simple utility to retry an erroring function until it succeeds

example.on('end', mustCall(() => {})); Check the callback function is called.

Test if a value is a semantic version string.

Array assertion helpers for the Chai assertion library

an assertion against a change to a value

Test if a value is a string having an uppercase first character.

Id equality assertions for chai

Comparison plugin for BDD assertion libraries (chai, should)

An alternate jQuery assertion library for Chai.

EventEmitter assertions for Unexpected

JSX assertions for Jasmine

CSS Style assertions for elements, using Chai.js

Make jest expect more convenient.

A small and simple library for asserting argument are the correct types

Test if a value is an empty array.

SlimIO is (JavaScript Primitives & Objects type checker)

Assert deeply nested values in Jest

Test if a value is iterator-like.

Jest-like snapshot feature for the rest of us + data-driven testing

Automated browser testing for the modern web development stack.

Ergonomic, modern and type-safe assertion library

Chai assertion library plugin to add `strictlyEqual` function and disable `equal`

Lightweight assertion testing framework

Image metadata plugin for the Unexpected assertion library

Run ava tests in the browser

Drop-in BDD helpers for AVA test runner 🌠

Test if a value is undefined or null.

A gulp plugin for power-assert

Test if a double-precision floating-point numeric value is finite.

Browserify transform for power-assert

simple, flexible, fun test framework

JSX assertions for Chai

MagicPen plugin for the Unexpected assertion library

Unit Testing for the PlugJS Build System ========================================

Test if a single-precision floating-point numeric value is NaN.

Cheerio assertions for the Chai assertion library

A jest assertion that checks calls for count, order and informed parameters, all at once

Test if a value is a gzip buffer.

Validate if a value is a positive integer between 0 & Number.MAX_SAFE_INTEGER

Boolean indicating if the current process is running on Windows.

Karma plugin for chai-equal-jsx

ESLint rules for tape

Extensible type-aware assertion library

A utility library that provides borrowing mechanisms via assertion functions

A simple and lightweight TypeScript type guard library for runtime type validation.

JSX React Element assertions for chai

Async HTTP request wrapper

is-any-type simple functionality alternative to check data type references such as typeof and instanceof

Supercool assertion library for Cypress

A composable matching/assertion/validation framework in Typescript that displays mismatches as diff trees

Assert (pretty) equality of Immutable.js iterables with unexpected

TypeScript assertion helpers

Test if an object has a specified property, either own or inherited.

Assert that specific environment variables exist.

Tools for snapshotting, replaying, and mocking HTTP queries with Jest

Command line tool for power-assert

Unexpected plugin for @dependable/state

a chai plugin for type assertions, support typescript

React assertions for the Chai assertion library

ESLint rules for tap

Assertion library written in TypeScript

simple assertion module for checking function arguments

Test if a value is a BooleanArray.

Runtime Verification Library for browsers and Node.js.

Mocha reporter that check the number of assertions

Test if a value is a BooleanArray.

TypeScript predicates library

Date comparison assertions for the Chai assertion library

A type enforcement library for javascript

Powerful test inspection library

jasmine-style 'expect' calls for mocha and other test frameworks

Helpers to easily write tests for React component/JSX code

Test if two double-precision floating-point numbers are the same value.

BDD/TDD assertion library for node.js and the browser. Test framework agnostic.

Test if two arguments are the same value.

Test if a value is a Date object.

expect assertion on the runtime

Test if a single-precision floating-point numeric value is positive zero.

Chai helper to include soft assertions on chai package

Test if a value is a BigInt.