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modules: runtime deprecate subpath folder mappings

Rodrigo Muino Tomonari requested to merge github/fork/guybedford/deprecate-export-trailer into master

This creates an explicit runtime deprecation warning when using the folder mappings in "exports" or "imports".

The implicit documentation deprecation was already made when the exports patterns PR was landed in https://github.com/nodejs/node/pull/34718 and fully replaced all documentation references to this.

The warning is carefully scoped to not apply to external packages in node_modules, unless explicitly using the --pending-deprecation flag.

Tests are included for local and external, require and import, imports and exports and self-resolution cases.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines
  • documentation is changed or added

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