The recently introduced typings-only mode in ngcc would incorrectly write compiled JavaScript files if typings-only mode was requested, in case the typings of the entry-point had already been processed in a prior run of ngcc. The corresponding format property for which the JavaScript files were written were not marked as processed, though, as the typings-only mode excluded the format property itself from being marked as processed. Consequently, subsequent runs of ngcc would not consider the entry-point to have been processed and recompile the JavaScript bundle once more, resulting in duplicate ngcc imports. Fixes #41198 PR Close #41209
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