packages.ts selects reviewed package fixtures from test/types/. It runs only for packages actually packed and installed by package-check.mjs. Adding a registry entry requires checking the complete fixture against its published type contract; do not replace historical namespace or overload checks with import-only smoke tests. Other packages retain their specialized refactor/scripts/*package-types.mjs checks until deliberately integrated.

types.ts owns the compiler matrix, strict compiler options, realpath isolation, and diagnostic accounting. TS 5.9.3 covers node10 CommonJS, NodeNext CommonJS and ESM, and bundler ESM; TS 4.3.5 covers node10 CommonJS. The single compiler adapter uses only the shared API and never sends newer resolution modes to TS 4.3. Both compilers are existing pinned development dependencies; no runtime dependency is introduced.

Fixtures must use package imports and put each @ts-expect-error immediately before its single-line invalid statement. First compile with directives; then neutralize directives without moving lines and require diagnostics at every invalid statement and nowhere else. Missing declarations and widened any must fail. Every parsed file must resolve inside the isolated installation or be a standard library file from the selected compiler's exact library directory. The temporary input is removed in finally; the caller owns installation cleanup.

Run yarn test:package --browser for the installed roster or yarn test:package --include=artplayer-plugin-audio-track,artplayer-plugin-hls-control for these two additions. report.json keeps typeScope/runtimeScope for the existing core/chapter checks and separately records additionalTypeScope and pluginTypes (compiler modes, installed declaration paths, negative lines/codes). This type proof does not imply installed runtime or browser acceptance.

Maintain the module with yarn typecheck:docs-tools, yarn lint, and node --test test/installed-types.test.js (also included in yarn test:node). The tests compile a real isolated package and reject a missing declaration, any widening, and a package link outside the consumer.