JSPM

Determine the specification defined classification of an object.

JavaScript/TypeScript linter (ESLint wrapper) with great defaults

Determine a value's type.

Test if a value is an object.

Test if a value is a boolean.

Test if a value is a Uint8Array.

Test if a value is a Uint16Array.

Test if a value is a string.

Test if a value is a Float32Array.

Test if a value is a number.

A simple and composable way to validate data in JavaScript (and TypeScript).

Test if a value is a function.

Test if a value is a Uint32Array.

Test if a value is a Float64Array.

Get a property from an object using dot (object path) notation.

Check if an environment is little endian.

Test if a value is a Buffer object.

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

check if an AST node is a function of some sort

Test if a value is a plain object.

Test whether a path exists on the filesystem.

Check if a Buffer/Uint8Array is a TAR file

Check for outdated, incorrect, and unused dependencies.

Is this a bluebird promise I see before me?

Check TypeScript type definitions

Check if browser is Internet Explorer

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

Check if a value is a `Blob`

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

Check if browser is Firefox

Check whether a binary exists in the PATH environment variable

Verify if something is a Promise

Is given string a language code (as per IANA)

Check if two values are shallowly equal to each other.

check if the current node version has async_hooks.

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

Promisified version of node-which

Checks if a given object is iterable

Detect the audio type of a Buffer/Uint8Array

Check if Electron is running in development

Checks TypeScript types match expected values

Checks if the given value is null or undefined

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

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

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

Check if a Buffer/Uint8Array is a ZIP file

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.

A gulp plugin for processing files with ESLint

JavaScript Standard Style React/JSX support - ESLint Shareable Config

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

Keep watch of your bundle size

Check whether a package or organization name is available on npm

A JSON fixer

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

Check if a value is a function

Check if a directory is empty.

A TypeScript ESLint config that loves you

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

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

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

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

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

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

Detect the image type of an ArrayBuffer/Uint8Array

ESLint shareable config for XO with 2-space indent

JavaScript Semistandard Style - ESLint Shareable Config

Validates password according to flexible and intuitive specifications

Check if a Buffer/Uint8Array is a BZIP2 file

[![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

Test if a finite numeric value is an odd number.

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

Aids humans and automation in managing npm audit results

Keep your library size in check

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

is-iojs determines if runtime is io.js.

Context menu for your Electron app

Check the validity of the format of an EU VAT number

A collection of functions for working with different casings.

Check if an object is an array or a typed array

Validate hostname based on RFC-1123

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

Check if the machine is running Windows or not.

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

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

Test if a value is NaN.

Check whether a binary version satisfies a semver range

Hunspell compatible spell checker

Markdown TaskList components

Test if an object's own property is enumerable.

TypeScript Standard Style based on StandardJS

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

Check if the package is being installed by another package

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

Check if the process is running as administrator on Windows

Test if a value is an Int32Array.

Test if a finite numeric value is an even number.

Assert a given object is a valid glob option

Check if a value is undefined or not.

Test if a value is a Uint8ClampedArray.

Test if a value is an Int16Array.

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

Detect the appearance of an element in the browser DOM

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

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

Checks that given package is installed globally or locally.

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

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

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

A pure css library to beautify checkbox and radio buttons.

code > prettier > stylelint > formatted code

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

Test if a value is a collection.

Check if the process is running with elevated privileges

Test if a value is an Int8Array.

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

Test if a value is an arguments object.

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

Check if a file path is an image

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

ESlint plugin to define custom module dependency rules.

Validate glob options

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

Test if a value is an Error object.

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

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

Fully customizable animated bouncy checkbox for React Native

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

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

Base58Check encoding

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

Standard assertion utilities.

Get or check the current macOS version

Checks if an input string is a capitalized or not.

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

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

Minimal JavaScript type checking library

Test if a value is an ArrayBuffer.

Run your TypeScript type tests using Jest

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

Compile TypeScript interfaces into a description that allows runtime validation

*A mostly reasonable approach to JavaScript*

[](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 complex number-like object.

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

Assertions and Validations for TypeScript

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

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

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

Run elm-review from Node.js

Easily expose your http server's health.

Test if a value is an array-like object.

Check if something is a positive number

Test if a value is array-like.

Lint CSS for email support against caniemail database.

Test if a value is a Complex64Array.

Check if a String/Buffer is TTF

Check if a number is in a given range

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

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Check whether a file can be executed

Check if a file path is a video file

Check if a file is a directory

Check types

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

Utilities for formatting and linting a Dockerfile.

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

Check that all files match prettier code style.

ESLint sharable config for strict linting

Test if a value is a typed array.

Test if a value is a complex typed array.

Check if a JavaScript environment has a DOM

Test whether a module is available as a dependency

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

Check if an Array is sorted

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

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

Type checking for .eslintrc.json

Test if a value is a Complex128Array.

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

Validates if a value is a JavaScript object.

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

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?)

Convert Ethereum address to a checksummed address

Check if a String/Buffer/ArrayBuffer is OTF

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

Test if a value is typed-array-like.

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

Build templates for initial values

Check the validity of the format of an EU VAT number

Check if NPM package names conflict

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

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

Library to check variable type and properties in object.

Utility to check if internet is connected or not

If X, return Y, else throw Z.

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

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

Check if something is a negative number

Build a navigation structure programatically

Validate the name of a custom element

*A mostly reasonable approach to JavaScript*

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

Validates if a value is undefined.

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

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

Check if an email domain belongs to an educational instutition

check if urls are dead or alive

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

Checks the integrity of an Endo bundle.

Tiny module for checking if Promise is globally available

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

Check if an object is empty or not.

Check if an environment is little endian.

Run commands if on specified node version.

Check your Vue project for unused Components

*A mostly reasonable approach to JavaScript*

Test if a value is a probability.

Verifies email domains

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

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

Check if a Buffer/Uint8Array is EOT

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

Check if a Buffer/Uint8Array is WOFF

Robustly checks an array of URLs for liveness.

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

Check if a Buffer/Uint8Array is a FLAC file.

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

Check if a string or buffer ends with a given string

Create JSON Schema validator from TypeScript.

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

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

Check if a buffer/Uint8Array is a woff2 file

Check if a file exists without try catch

Check a character if it is a correctly supported emoji.

Verifies that typescript examples in markdown files actually compile.

Utility for linting a docker file against accepted good practices

Check if two numbers are equal within a given tolerance

Noir ESLint shareable config

Check for outdated, incorrect, and unused dependencies.

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

Check if an URL is a valid HTTP URL.

Check if a Buffer/Uint8Array is a MP3 file.

Check whether a string is a valid HTTP URL

Returns `true` if text is upper case only.