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qs
A querystring parser with nesting supporttape
tap-producing test harness for node and browsersprop-types-tools
Custom React PropType validatorsfaucet
human-readable TAP summarizertestling
unit tests in all the browsersprop-types-exact
For use with React PropTypes. Will error on any prop not explicitly specified.util.promisify
Polyfill/shim for util.promisify in node versions < v8object.assign
ES6 spec-compliant Object.assign shim. From https://github.com/es-shims/es6-shimes-abstract
ECMAScript spec abstract operations.json-stable-stringify
ls-engines
Determine if your dependency graph's stated "engines" criteria is met.js-traverse
json-file-plus
Read from and write to a JSON file, minimizing diffs and preserving formatting.object-keys
Object.keys shimistanbul-merge
Merge multiple istanbul coverage reports into one.npmignore
Command line tool for creating or updating a .npmignore file based on .gitignore.aud
Use `npx aud` instead of `npm audit`, whether you have a lockfile or not!shell-quote
get-intrinsic
Get and robustly cache all JS language-level intrinsics at first require time.listify
Turn an array into a list of comma-separated values, appropriate for use in an English sentence.simd
ES7 (proposed) SIMD numeric type shim/polyfillrepo-report
CLI to list all repos a user has access to, and report on their configuration in aggregate.publishers
Provide a package name, get a list of every version, and who published it.es-to-primitive
ECMAScript "ToPrimitive" algorithm. Provides ES5 and ES6/ES2015 versions.safe-publish-latest
Ensure that when you `npm publish`, the "latest" tag is only set for the truly latest version.define-properties
Define multiple non-enumerable properties at once. Uses `Object.defineProperty` when available; falls back to standard assignment in older engines.global-cache
Sometimes you have to do horrible things, like use the global object to share a singleton. Abstract that away, with this!promise-deferred
A lightweight Deferred implementation, on top of Promises/A+eslint-config
My shareable `eslint` config.ljharb
camelize
require-allow-edits
A GitHub action to require "allow edits" to be checked on a PR.can-merge
get-dep-tree
Use npm's Arborist to get a dependency tree for a package.side-channel
Store information about any JS value in a side channel. Uses WeakMap if available.es-get-iterator
Get an iterator for any JS language value. Works robustly across all environments, all versions.list-exports
Given a package name and a version number, or a path to a package.json, what specifiers does it expose?get-nans
Get an array of all distinct NaN values supported by the engine. There can be only one!tsconfig
My personal tsconfig(s), so my open source projects can share them.uglify-register
The require hook will bind itself to node's require and automatically uglify files on the fly.promiseback
Accept an optional node-style callback, and also return a spec-compliant Promise!html-element-map
Look up HTML tag names via HTML Element constructors, and vice versa.es-errors
A simple cache for a few of the JS Error constructors.call-bind
Robustly `.call.bind()` a function.scorecard-cli
A CLI for OpenSSF Scorecard data.ls-publishers
List your dependency graph, grouped by publishers.proposal-is-error
ECMAScript Proposal, specs, and reference implementation for Error.isErrorsafe-regex-test
Give a regex, get a robust predicate function that tests it against a string.unused-files
List unused files in your package.mock-property
Given an object and a property, replaces a property descriptor (or deletes it), and returns a thunk to restore it.private-fields
What private fields does this object have?set-function-length
Set a function's length propertyunbox-primitive
Unbox a boxed JS primitive value.document.contains
Polyfill/shim for `document.contains`npm-lockfile
Safely generate an npm lockfile and output it to the filename of your choice.make-generator-function
Returns an arbitrary generator function, or undefined if generator syntax is unsupported.internal-slot
ES spec-like internal slots.safe-array-concat
`Array.prototype.concat`, but made safe by ignoring Symbol.isConcatSpreadablenpm-deprecations
Given an npm module name, get a map of npm version numbers to deprecation messages.find-value-locations
Given an object, and a value, return a tuple of the property name, and the object on which it is an own property.set-function-name
Set a function's name propertystop-iteration-iterator
Firefox 17-26 iterators throw a StopIteration object to indicate "done". This normalizes it.intl-fallback-symbol
ECMA-402 Intl spec's internal `FallbackSymbol`make-async-function
Function that returns an arbitrary `async function`, or undefined if `async function` syntax is unsupported.define-data-property
Define a data property on an object. Will fall back to assignment in an engine without descriptors.jsonify
.github
tc39-ci
Begin appes-define-property
`Object.defineProperty`, but not IE 8's broken one.iterate-value
Iterate any iterable JS value. Works robustly in all environments, all versions.daytime
npm module to combine two Date objects, "day" and "time"iterate-iterator
Iterate any JS iterator. Works robustly in all environments, all versions.concat-map
es-value-fixtures
Fixtures of ES values, for testing purposes.big-integer-max
Given two valid integers in string form, return the larger of the two.node-comments
Transform comments in JS files between multiple styles - single-line, multi-line, both, and more to come!make-arrow-function
Function that returns an arbitrary arrow function, or undefined if arrow function syntax is unsupported.define-accessor-property
Define an accessor property on an object. Will either throw, or fall back to assignment in loose mode, in an engine without descriptors.es-object-atoms
ES Object-related atoms: Object, ToObject, RequireObjectCoerciblegfm-footnotes
Prune unused footnote references in GitHub-flavored Markdownrenovate
Shared renovate config.big-integer-min
Given two valid integers in string form, return the smaller of the two.lockfile-info
Info about an npm project - which lockfile version, which lockfile(s) are present, etc.gopd
`Object.getOwnPropertyDescriptor`, but accounts for IE's broken implementation.resumer
a through stream that starts paused and resumes on the next tickAsyncIterator.prototype
`AsyncIterator.prototype`, or a shared object to use.TcoExpand
Expands t.co short links on twitter.com when possible. This only works because Twitter provides the full URL as a data attribute on most shortened links - it's quick and dirty, it may break at any time, and it depends on jQuery to work.es-shim-unscopables
Helper package to shim a method into `Array.prototype[Symbol.unscopables]`primordials
node core's "primordials" module, but robust for use in a published packagesafe-bigint
Safely create a BigInt from a numerical string, even one larger than MAX_SAFE_INTEGER.coauthors
A cli to generate a complete git co-authors list, including existing co-authors, for use in a commit message.open-sauced-goals
es-array-method-boxes-properly
Utility package to determine if an `Array.prototype` method properly boxes the callback's receiver and third argument.Iterator.prototype
`Iterator.prototype`, or a shared object to use.array-map
keytween
Encode and decode a string using the "look between X and Y on your keyboard" meme formatrepo-report-cache
make-async-generator-function
Function that returns an arbitrary async generator function, or undefined if async generator syntax is unsupported.validate-exports-object
Validate an object in the "exports" field.possible-typed-array-names
A simple list of possible Typed Array names.Love Open Source and this site? Check out how you can help us