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a897ef728d
Support custom fetchers from pnpmfiles in pacquet, with delegate-envelope parity in the TypeScript CLI (related to pnpm/pnpm#11685) Pacquet already supported custom resolvers via its Node.js worker IPC but lacked the fetcher counterpart. This extends the same protocol pattern: - Define a CustomFetcher trait and get_custom_fetchers() on PnpmfileHooks - Add fetchers/fetcher target dispatch to the worker's NDJSON protocol and JS runner, mirroring the existing resolver path; the hook is invoked with the TS-parity args fetch(cafs, resolution, opts, fetchers) (cafs/fetchers are null over IPC) - Implement NodeJsCustomFetcher bridging the trait to the worker - Create CustomFetcherPicker for consulting fetchers in declared order - Consult custom fetchers before the built-in dispatch on both the frozen-lockfile and fresh-lockfile install paths; hook-load failures abort the install (PNPMFILE_FAIL) - Support delegation: { delegate: <resolution> } rewrites the resolution for the standard tarball/git path; non-delegate responses and custom-typed delegates fail the install - lockfile: add LockfileResolution::Custom preserving custom-typed resolution objects verbatim, so custom resolvers/fetchers can round-trip them; unclaimed custom-typed resolutions fail with the TS-parity UNSUPPORTED_RESOLUTION_TYPE error - TypeScript: pickFetcher now accepts the { delegate: <resolution> } envelope from custom fetchers (the portable delegation form), and hooks.types exports CustomFetcherDelegation Full CAS fetch in pacquet (where a fetcher produces file content directly rather than delegating) requires a streaming protocol extension (separate follow-up).