This commit adds a `tracePerformance` option for tsconfig.json. When specified, it causes a JSON file with timing information from the ngtsc compiler to be emitted at the specified path. This tracing system is used to instrument the analysis/emit phases of compilation, and will be useful in debugging future integration work with @angular/cli. See ngtsc/perf/README.md for more details. PR Close #29380
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