playwright-dev

Guide for extending Playwright with new APIs, MCP tools, CLI commands, and vendored dependencies. See CLAUDE.md for monorepo structure, build/test/lint commands, and coding conventions. - Covers monorepo structure, build/test/lint workflows, and coding conventions via CLAUDE.md reference - Includes detailed walkthroughs for implementing client/server APIs, writing tests, and modifying protocol layers - Explains how to add MCP tools, CLI commands, and configuration options within the Playwright ecosystem - Documents the vendoring process for bundling third-party npm packages into playwright-core or playwright - Library Architecture — client/server/dispatcher structure, protocol layer, DEPS rules - Adding and Modifying APIs — define API docs, implement client/server, add tests - MCP Tools and CLI Commands — add MCP tools, CLI commands, config options - Vendor Dependencies & Bundling — utilsBundle, coreBundle, babelBundle; adding vendored npm packages; DEPS.list; check_deps - Updating WebKit Safari Version — update the Safari version string in the WebKit user-agent - Bisecting Across Published Versions — reproduce regressions side-by-side from npm and diff node_modules/playwright/lib/ between versions - Dashboard - the UI powering the "playwright cli show" command, and how to work on it