What is the type of this builtin JS value?

type-check allows you to check the types of JavaScript values at runtime with a Haskell like type syntax.

A small, fast, and correct TOML parser/serializer

Improved typeof detection for node.js and the browser.

a built-in tap extension that adds typescript support

Unique tag for use in the type-fest Tagged type

Relationship type checker functions for Typescript types.

Type check values

Strongly typed validation library that decouples type aliases from validation logic

Given a Mocha / Cypress spec file, returns the list of suite and test names

Makes Jest throw on React prop-type failures

Buffer Reading and Writing

Postgres date column parser

Sui TypeScript API

Detect the file type of a file, stream, or data

Check if a path is a file, directory, or symlink

Dependency-free native ESM type enforcement for JavaScript values, objects, classes, browsers, and Node.

Parse HTTP Content-Type header according to RFC 9110

Run jasmine specs headlessly through Headless Chrome

The Firebase Authenticaton component of the Firebase JS SDK.