9d9c9e43e5
The usage of array spread syntax in source code may be downleveled to a call to TypeScript's `__spread` helper function from `tslib`, depending on the options `downlevelIteration` and `emitHelpers`. This proves problematic for ngcc when it is processing ES5 formats, as the static evaluator won't be able to interpret those calls. A custom foreign function resolver is not sufficient in this case, as `tslib` may be emitted into the library code itself. In that case, a helper function can be resolved to an actual function with body, such that it won't be considered as foreign function. Instead, a reflection host can now indicate that the definition of a function corresponds with a certain TypeScript helper, such that it becomes statically evaluable in ngtsc. Resolves #30299 PR Close #30492
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