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4592 packages found
Do things in development and nothing otherwise
A simple and composable way to validate data in JavaScript (and TypeScript).
Test if a double-precision floating-point numeric value is NaN.
- stdlib
- stdmath
- assertion
- assert
- utilities
- utility
- utils
- util
- math
- mathematics
- ieee754
- floating-point
- float
- number
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uvu is an extremely fast and lightweight test runner for Node.js and the browser
A little library for asserting types and values, with zero dependencies.
- type
- types
- type-check
- type-checking
- duck-typing
- arguments
- parameters
- values
- data
- contract
- assert
- check
- verify
- safe
typesafe assertion library for TypeScript 3.7+
Test if a value is a string.
tap-producing test harness for node and browsers
JavaScript Testing utilities for React
- javascript
- shallow rendering
- shallowRender
- test
- reactjs
- react
- flux
- testing
- test utils
- assertion helpers
- tdd
- mocha
Lazy assertions without performance penalty
Function argument validation for humans
- type
- types
- check
- checking
- guard
- guards
- assert
- assertion
- predicate
- predicates
- is
- validate
- validation
- utility
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TypeScript implementation of invariant(condition, message)
Test if a value is a number.
Extends Chai with assertions about promises.
Test if a value is a boolean.
Hook and modify stdout and stderr
JavaScript Testing utilities for React
- javascript
- shallow rendering
- shallowRender
- test
- reactjs
- react
- flux
- testing
- test utils
- assertion helpers
- tdd
- mocha
Test if an object has a specified property.
- stdlib
- stdassert
- assertion
- assert
- utilities
- utility
- utils
- util
- object
- obj
- has
- hasown
- hasownproperty
- property
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