A namespace solution

Compile `using` and `await using` declarations to ES2015

Expand environment variables using dotenv

Merge objects using their property descriptors

Like duplexer but using streams3

Compile regular expressions using named groups to ES5.

Cookies, optionally signed using Keygrip.

JavaScript HLS client using MediaSourceExtension

Resolve URL pathnames using JavaScript

Engine for Shiki using JavaScript's native RegExp

Timing safe string compare using double HMAC

Browser running for Vitest using playwright

create a pipeline of streams using Minipass

Semaphore using `async` and `await`

A simple key/value storage using files to persist the data

Gracefully handle a Promise using async/await.

Compute contour polygons using marching squares.

Validator middleware using Zod

Detect global variables in JavaScript using acorn

Global HTTP/HTTPS proxy configurable using environment variables.