When using the `NewEntryPointWriter` we copy unmodified files over to the new entry-point in addition to writing out the source files that are processed by ngcc. But we were not copying over associated source-map files for these unmodified source files, leading to warnings in downstream tooling. Now we will also copy over source-maps that reside as siblings of unmodified source files. We have to make sure that the sources of the source-map point to the correct files, so we also update the `sourceRoot` property of the copied source-map. Fixes #40358 PR Close #40429
Angular Compatibility Compiler (ngcc)
This compiler will convert node_modules compiled with ngc, into node_modules which
appear to have been compiled with ngtsc.
This conversion will allow such "legacy" packages to be used by the Ivy rendering engine.
Building
The project is built using Bazel:
yarn bazel build //packages/compiler-cli/ngcc
Unit Testing
The unit tests are built and run using Bazel:
yarn bazel test //packages/compiler-cli/ngcc/test
Integration Testing
There are tests that check the behavior of the overall executable:
yarn bazel test //packages/compiler-cli/ngcc/test:integration