5e5be43acd
Any decorator information present in TypeScript is emitted into the generated JavaScript sources by means of `__decorate` call. This call contains both the decorators as they existed in the original source code, together with calls to `tslib` helpers that convey additional information on e.g. type information and parameter decorators. These different kinds of decorator calls were not previously distinguished on their own, but instead all treated as `Decorator` by themselves. The "decorators" that were actually `tslib` helper calls were conveniently filtered out because they were not imported from `@angular/core`, a characteristic that ngcc uses to drop certain decorators. Note that this posed an inconsistency in ngcc when it processes `@angular/core`'s UMD bundle, as the `tslib` helper functions have been inlined in said bundle. Because of the inlining, the `tslib` helpers appear to be from `@angular/core`, so ngcc would fail to drop those apparent "decorators". This inconsistency does not currently cause any issues, as ngtsc is specifically looking for decorators based on their name and any remaining decorators are simply ignored. This commit rewrites the decorator analysis of a class to occur all in a single phase, instead of all throughout the `ReflectionHost`. This allows to categorize the various decorate calls in a single sweep, instead of constantly needing to filter out undesired decorate calls on the go. As an added benefit, the computed decorator information is now cached per class, such that subsequent reflection queries that need decorator information can reuse the cached info. PR Close #31614 |
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| README.md | ||
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README.md
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