Angular Package Format

• FESM - Flattened ES Modules
• Module ID = Module Specifier

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• README.md
• package.json
• core.d.ts
• esm2020/
  • core.mjs
  • index.mjs
  • public_api.mjs
  • testing/ - @angular/core/testing
• fesm2015/
  • core.mjs
  • core.mjs.map
  • testing.mjs
  • testing.mjs.map
• fesm2020/
  • core.mjs
  • core.mjs.map
  • testing.mjs
  • testing.mjs.map
• testing/
  • package.json
  • testing.d.ts
• bundles/ - UMD, ES5