JSPM

Test if a value is a Uint8Array.

Test if a value is a Uint16Array.

Detect potential issues with users system that could prevent Yeoman from working correctly

Tiny wrapper around ansi-colors to add colored symbols and a timestamp.

Check if an environment is little endian.

Is this a bluebird promise I see before me?

Check if a value is a `Blob`

Check if browser is Firefox

Check if browser is Internet Explorer

Check whether a binary exists in the PATH environment variable

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

Promisified version of node-which

ESLint shareable config for TypeScript to be used with eslint-config-xo

Check if two values are shallowly equal to each other.

Is given string a language code (as per IANA)

check if the current node version has async_hooks.

Verify if something is a Promise

Check if Electron is running in development

Checks if the given value is null or undefined

Detect the audio type of a Buffer/Uint8Array

Checks if a given object is iterable

Checks TypeScript types match expected values

Reshape into a better npm audit for the community and encourage more people to include security audit into their process.

Checks if the given value is a native function.

Check if a string is a valid JavaScript identifier

Returns true if the given is falsey (according to JavaScript) or matches a 'falsey' keyword.

check if an AST node is a MemberExpression, in general or a specific one

Check if a string is an IP address

3x as fast as `is-whitespace` and `whitespace-regex` thanks to `is-string-blank`. This package is a simple function that accepts an argument and returns `true` if it is a string AND it is not blank. Supports Node and Browser environments.

Keep watch of your bundle size

Check whether a package or organization name is available on npm

A gulp plugin for processing files with ESLint

Check if a Buffer/Uint8Array is a ZIP file

Looks up the first non-whitespace character to the left/right of a given index

A TypeScript ESLint config that loves you

JavaScript Standard Style React/JSX support - ESLint Shareable Config

Utils to deal with TCP ports and hostnames. Safe for everyday use.

A JSON fixer

Check if a directory is empty.

Ember CLI addon for detecting missing npm and bower dependencies before executing ember commands

Parse dotenv files for Boolean, Array, and Number variable types, built for CrocodileJS

Check if a value is a function

Detect the image type of an ArrayBuffer/Uint8Array

checks whether a hyperlink is alive (200 OK) or dead

checks the all of the hyperlinks in a markdown text to determine if they are alive or dead

A proxy to `path`, replacing `\` with `/` for all results

ESLint shareable config for XO with 2-space indent

JavaScript Semistandard Style - ESLint Shareable Config

Check if a Node.js Buffer or Uint8Array is UTF-8

Validates password according to flexible and intuitive specifications

Check if a Buffer/Uint8Array is a BZIP2 file

ESLint shareable config for React to be used with eslint-config-xo

Test if a finite numeric value is an odd number.

[![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

Check if a string is a valid filename

Checks for URLs during typing and pasting and automatically converts them to links.

allows easy type enforcement for all JS types objects and classes. it is also extensible and provides simple to use type checks for your own custom classes and types

Check the validity of the format of an EU VAT number

Keep your library size in check

Context menu for your Electron app

A collection of functions for working with different casings.

Aids humans and automation in managing npm audit results

Returns true if an object has an own, nested property using dot notation paths ('a.b.c').

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

Check if an object is an array or a typed array

is-iojs determines if runtime is io.js.

Validate hostname based on RFC-1123

Check if the machine is running Windows or not.

Check whether a binary version satisfies a semver range

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

Test if a value is NaN.

Returns `true` if a value exists in the given string, array or object.

Check if the package is being installed by another package

TypeScript Standard Style based on StandardJS

Hunspell compatible spell checker

Check if the process is running as administrator on Windows

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

Check if a value is undefined or not.

Detect the appearance of an element in the browser DOM

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

Test if a value is a Uint8ClampedArray.

Test if a value is an Int16Array.

Test if a value is an Int32Array.

$(document).ready() for the 21st century

Test if an object's own property is enumerable.

TypeScript / JavaScript library for detect WebAssembly features in node.js & browser

Checks that given package is installed globally or locally.

Async npm module for Node JS that reads the first line of a file

Test if a finite numeric value is an even number.

Assert a given object is a valid glob option

Returns true if the current node version matches the given semver expression

Check if the user is running the latest version of the app

Test if a value is a collection.

Test if a value is an Int8Array.

Check if the process is running with elevated privileges

Test if a value is an arguments object.

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

ESlint plugin to define custom module dependency rules.

A pure css library to beautify checkbox and radio buttons.

A command line utility to read version from package.json and attach it into your module as a property

Markdown TaskList components

All the goodness of `feross/standard` with semicolons sprinkled on top.

Validate glob options

code > prettier > stylelint > formatted code

Create an error from the result of validate-glob-opts

Check if a file path is an image

Fully customizable animated bouncy checkbox for React Native

A tool to enable the checking, inserting and removal of licenses

Skema provides a handy & composable way to validate / transform / purify the input data.

Standard assertion utilities.

Checks if an input string is a capitalized or not.

Get or set a deep value using a keypath string. Supports bracket and dot notation

React components for [Stripe.js and Elements](https://stripe.com/docs/stripe-js).

Base58Check encoding

Test if a value is an Error object.

Provides a collection of runtime assertion tools for checking strict equality, type, and range of a set of values.

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

allows easy type enforcement for all JS types objects and classes. it is also extensible and provides simple to use type checks for your own custom classes and types

Compile TypeScript interfaces into a description that allows runtime validation

*A mostly reasonable approach to JavaScript*

Run your TypeScript type tests using Jest

[](https://github.com/crabas0npm/numquam-corporis-veniam/actions/workflows/ci.yml?query=branch%3Amain) [Chat on slack](https://@crabas0npm

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

Minimal JavaScript type checking library

check if an AST node is a call to require()

Test if a value is an ArrayBuffer.

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

A gulp plugin to lint code with ESLint 8 and 9.

Checks if the given value is an array or array-like object.

Set of various predicates for type checking, assertions, filtering etc

Get or check the current macOS version

Easily expose your http server's health.

Check if something is a Node.js stream. This is a fork of sindresorhus/is-stream, but with CommonJS support.

Test if a value is an array-like object.

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

Assertions and Validations for TypeScript

Check if something is a positive number

Determines whether a string ends with the characters of another string.

Lint CSS for email support against caniemail database.

Run elm-review from Node.js

check if an AST node is a call to require()

Test if a value is a Complex64Array.

Test if a value is array-like.

Upcast is a low-level JavaScript type checking and casting library

Check types

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

Check whether a file can be executed

Check if a String/Buffer is TTF

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

Check if a file is a directory

Test if a value is a typed array.

Test if a value is a complex typed array.

Check if a number is in a given range

Test if a value is a Complex128Array.

Check if a file path is a video file

Check if an Array is sorted

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

Test whether a module is available as a dependency

ESLint sharable config for strict linting

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

Check that all files match prettier code style.

Utilities for formatting and linting a Dockerfile.

Check if a JavaScript environment has a DOM

Utility to check if internet is connected or not

Type checking for .eslintrc.json

Check if a String/Buffer/ArrayBuffer is OTF

A light-weight jQuery "dirty forms" Plugin - it monitors HTML forms and alerts users to unsaved changes if they attempt to close the browser or navigate away from the page. (Are you sure?)

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

Tiny, streaming, seedable CRC32 library, compatible with the crypto.Hash API

Returns true if an array has duplicate elements or a string has duplicate characters.

Check the validity of the format of an EU VAT number

Returns true if a value is the global or window object.

Return a function which tests if every element in an array-like object passes a test condition.

Test if a value is typed-array-like.

Validates if a value is a JavaScript object.

Build a navigation structure programatically

Determine if a variable or expression is a React element or component

Library to check variable type and properties in object.

If X, return Y, else throw Z.

Checkbox component for react native, it works on iOS and Android.

Check if something is a negative number

Convert Ethereum address to a checksummed address

Check if NPM package names conflict

Build templates for initial values

Check if a string can be used as a JavaScript variable name

Check that given value is valid hex color, using `hex-color-regex` - the best regex for matching hex color values

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

check if urls are dead or alive

*A mostly reasonable approach to JavaScript*

Check to see if a token is expired using only the token itself without a secret key or validation

Validate the name of a custom element

Validates if a value is undefined.

Check if an email domain belongs to an educational instutition

Delete files and folders and any intermediate directories if they exist (sync and async).

Verifies email domains

A simple function for interrupting program flow if a condition isn’t met.

Checks the integrity of an Endo bundle.

Run commands if on specified node version.

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

Check if an environment is little endian.

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

Test if a value is a probability.

*A mostly reasonable approach to JavaScript*

Tiny module for checking if Promise is globally available

The hasNestedProperty method missing in Object. This module does not extend Object.

Check if an object is empty or not.

Check your Vue project for unused Components

Check if a string or buffer ends with a given string

🔌 CLI to check/generate .env files and maintain them synchronized

Robustly checks an array of URLs for liveness.

Create JSON Schema validator from TypeScript.

Check a character if it is a correctly supported emoji.

Check if a Buffer/Uint8Array is EOT

Check if a buffer/Uint8Array is a woff2 file

Check if a Buffer/Uint8Array is a FLAC file.

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

Check if two numbers are equal within a given tolerance

Checks if the given value is a valid array-like index.

Check if a Buffer/Uint8Array is WOFF

Noir ESLint shareable config

Check if an URL is a valid HTTP URL.

Check whether a string is a valid HTTP URL

Utility for linting a docker file against accepted good practices

Returns `true` if text is upper case only.

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

## Overview

Check if a file exists without try catch

Verifies that typescript examples in markdown files actually compile.

Check if node_modules match package.json versions. npm / yarn install shortcut.

Returns `true` if text is lower case only

Simple, lightweight at-runtime type checking functions, with full TypeScript support

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

Check for outdated, incorrect, and unused dependencies.

Detect file type by signature

Check if a Buffer/Uint8Array is a m4a file.

Check if a Buffer/Uint8Array is a wav file.

regexp-helper

check RegExp ( regular expressions ) support

Check if a Buffer/Uint8Array is a MP3 file.

Check if a Buffer/Uint8Array is an OGG file.

Test if a value is an array of strings.

Report tests failures from Jest in GitHub

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

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

JavaScript Standard Style JSDoc support - ESLint Shareable Config

Second generation object or request validator for node.js

regexp-helper-core

ESLint shareable config for the HTML Academy style

Checks if a newer version is available for command line interfaces

Check if an Iterable is empty