JSPM

A type checking library where each exported function returns either true or false and does not throw. Also added tests.

Check if a binary is working

Binary wrapper that makes your programs seamlessly available as local dependencies

Check if a string is SVG

Returns true if a file path does not contain any invalid characters.

Hook and modify stdout and stderr

hast utility to check if a node has a property

Check if a string is an IP address

Type assertions aka less-broken `typeof`

`util.inspect` with additional type information

Check if the process is running in a Continuous Integration (CI) environment

Check if a binary is working

Determine if a filename and/or buffer is text or binary. Smarter detection than the other solutions.

Detect the archive type of a Buffer/Uint8Array

Check dependencies in your node module

Validates if a value is an array.

Match BCP 47 language tags with language ranges per RFC 4647

A tiny javascript type testing tool

JavaScript Standard Style JSX support - ESLint Shareable Config

Returns true if the value passed is all whitespace.

Validates if a value is a number.

Validates if a value is an integer.

Function argument validation for humans

Checks if the given value is a window object.

Binary wrapper that makes your programs seamlessly available as local dependencies

Check if a Buffer/Uint8Array is a PNG image

find undeclared identifiers and property accesses in a javascript file.

Returns `true` if an array has a glob pattern.

A HOC enabling you to easily implement extended property equality checks for your React Components

Check if a string only contains alphanumeric characters

Validate an email address according to RFCs 5321, 5322, and others

Check if a Buffer/Uint8Array is a JPEG image

Binary wrapper that makes your programs seamlessly available as local dependencies

Update notifications for your CLI app, maintained in CommonJS (CJS)

Check whether a value is "empty".

Check if mobile browser.

Binary wrapper for Flow - A static type checker for JavaScript

JavaScript Standard Style

Wrap your standards in a tortilla and cover it in special sauce.

ESLint shareable config for the Google style

Ensure a path doesn't contain null bytes

Test if a value is an array.

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

Determine the name of a value's constructor.

Test if an object has a specified property.

Check if a Buffer/Uint8Array is a GIF image

Validate domain name

Check whether a RegExp flag is supported

Test if a value is object-like.

ESLint shareable config for XO

Check if a URL is relative

Check if a string is HTML

Check if an environment is big endian.

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

maximally minimal type-testing library

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

Test if a value is a regular expression.

Test if a value is a regular expression string.

Try to downgrade the permissions of a process with root privileges and block access if it fails

Test if a value is an object.

Test if a value is a Float32Array.

Test if a value is a number.

Test if a value is a string.

Determine a value's type.

Determine the specification defined classification of an object.

Test if a value is a boolean.

JavaScript/TypeScript linter (ESLint wrapper) with great defaults

Test if a value is a function.

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

Test if a value is a Float64Array.

Test whether a path exists on the filesystem.

Test if a value is a Uint32Array.

Test if a value is a Uint8Array.

Test if a value is a Buffer object.

Test if a value is a Uint16Array.

check if an AST node is a function of some sort

Test if a value is a plain object.

Check for outdated, incorrect, and unused dependencies.

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

Check if an environment is little endian.

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

Check if a Buffer/Uint8Array is a TAR file

Is this a bluebird promise I see before me?

Check TypeScript type definitions

Check if a process is running

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

Is given string a language code (as per IANA)

Check whether a binary exists in the PATH environment variable

check if the current node version has async_hooks.

Check if two values are shallowly equal to each other.

Promisified version of node-which

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

Verify if something is a Promise

Checks TypeScript types match expected values

Detect the audio type of a Buffer/Uint8Array

Check if Electron is running in development

Checks if a given object is iterable

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

Checks if the given value is a native function.

Check if a string is a valid JavaScript identifier

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

Check if a string is an IP address

Check if a Buffer/Uint8Array is a ZIP file

A JSON fixer

A gulp plugin for processing files with ESLint

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

Check whether a package or organization name is available on npm

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.

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

Keep watch of your bundle size

JavaScript Standard Style React/JSX support - ESLint Shareable Config

Check if a value is a function

A TypeScript ESLint config that loves you

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

Check if a directory is empty.

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

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

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

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

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

JavaScript Semistandard Style - ESLint Shareable Config

Detect the image type of an ArrayBuffer/Uint8Array

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

ESLint shareable config for XO with 2-space indent

Validates password according to flexible and intuitive specifications

Check if a Buffer/Uint8Array is a BZIP2 file

Check if a string is a valid filename

[![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

Aids humans and automation in managing npm audit results

Test if a finite numeric value is an odd number.

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

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

Context menu for your Electron app

Keep your library size in check

is-iojs determines if runtime is io.js.

Check the validity of the format of an EU VAT number

Check if an object is an array or a typed array

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

A collection of functions for working with different casings.

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.

Markdown TaskList components

Hunspell compatible spell checker

Check if the process is running as administrator on Windows

TypeScript Standard Style based on StandardJS

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

Check if the package is being installed by another package

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

Test if a finite numeric value is an even number.

Test if a value is an Int32Array.

Test if an object's own property is enumerable.

Assert a given object is a valid glob option

Check if a value is undefined or not.

Test if a value is an Int16Array.

Checks that given package is installed globally or locally.

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

Test if a value is a Uint8ClampedArray.

Detect the appearance of an element in the browser DOM

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

A pure css library to beautify checkbox and radio buttons.

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

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

code > prettier > stylelint > formatted code

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

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

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

Test if a value is a collection.

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

Check if the process is running with elevated privileges

Test if a value is an Int8Array.

Test if a value is an arguments object.

Validate glob options

ESlint plugin to define custom module dependency rules.

Check if a file path is an image

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

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

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

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.

Test if a value is an Error object.

Fully customizable animated bouncy checkbox for React Native

Standard assertion utilities.

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

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

Checks if an input string is a capitalized or not.

Base58Check encoding

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

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

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

Minimal JavaScript type checking library

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

Get or check the current macOS version

Run your TypeScript type tests using Jest

Compile TypeScript interfaces into a description that allows runtime validation

Test if a value is an ArrayBuffer.

*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

Run elm-review from Node.js

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

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

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

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.

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

Check whether a file can be executed

Check if a String/Buffer is TTF

Check if a file path is a video file

Check if a file is a directory

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

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

Check if a number is in a given range

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

Utilities for formatting and linting a Dockerfile.

Type checking for .eslintrc.json

Check that all files match prettier code style.

Check types

Test if a value is a typed array.

Test if a value is a complex typed array.

Noir ESLint shareable config

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

ESLint sharable config for strict linting

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

Check if an Array is sorted

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

Check if a JavaScript environment has a DOM

Validates if a value is a JavaScript object.

Test if a value is a Complex128Array.

Test whether a module is available as a dependency

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

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 NPM package names conflict