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Serves a webpack app. Updates the browser on changes.

A development middleware for webpack

A composable, type-safe workflow engine built on optics. Define tasks, sequences, parallel steps, branches, and error recovery — then compile and execute them as directed graphs.

Epub parser

Generate errors that contain a code frame that point to source locations.

Collection of helper functions used by Babel transforms.

A JavaScript parser

Vitest module mocker implementation

Babel Types is a Lodash-esque utility library for AST nodes

Babel compiler core.

Fork of pretty-format with support for ESM

The Babel Traverse module maintains the overall tree state, and is responsible for replacing, removing, and adding nodes

Generate an AST from a string template.

Turns an AST into code.

Convert a tilde path to an absolute path: `~/dev` → `/Users/sindresorhus/dev`

Cross-platform WebSocket Servers for Node.js, Deno, Bun and Cloudflare Workers

Vite plugin bridging preview diagnostics, browser errors, and dev-server lifecycle events

Allow parsing of jsx

Babel helper to create your own polyfill provider