VS Code extension development

The extension source is editors/vscode/. It targets Node 20 and VS Code 1.100, bundles production code with esbuild, and keeps mobile build logic in cargo-ferry.

cargo build --locked -p cargo-ferry
cd editors/vscode
npm ci
npm run typecheck
npm run lint
npm test
npm run test:host
npm run perf
npm run package
npm run vsix:smoke

Set RUSTFERRY_TEST_CLI to an alternate real CLI; otherwise host and performance tests expect ../../target/debug/cargo-ferry. Extension Host smoke uses isolated user/extension directories and checks both an ordinary Rust workspace that must remain inactive and a Ferry workspace that must activate, discover, validate, refresh views, and open its manifest.

Unit tests cover protocol framing, process bounds/cancellation, discovery, tasks, validation freshness, fix safety, and project input validation. The host smoke does not build, install, launch, or observe a mobile application.

For contributor use, rustferry.developmentMode may resolve the checkout’s debug CLI. Keep it disabled for normal projects. See VSIX packaging for the exact bundle boundary.