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The compiler performs cycle analysis for the used directives and pipes of a component's template to avoid introducing a cyclic import into the generated output. The used directives and pipes are represented by their output expression which would typically be an `ExternalExpr`; those are responsible for the generation of an `import` statement. Cycle analysis needs to determine the `ts.SourceFile` that would end up being imported by these `ExternalExpr`s, as the `ts.SourceFile` is then checked against the program's `ImportGraph` to determine if the import is allowed, i.e. does not introduce a cycle. To accomplish this, the `ExternalExpr` was dissected and ran through module resolution to obtain the imported `ts.SourceFile`. This module resolution step is relatively expensive, as it typically needs to hit the filesystem. Even in the presence of a module resolution cache would these module resolution requests generally see cache misses, as the generated import originates from a file for which the cache has not previously seen the imported module specifier. This commit removes the need for the module resolution by wrapping the generated `Expression` in an `EmittedReference` struct. This allows the reference emitter mechanism that is responsible for generating the `Expression` to also communicate from which `ts.SourceFile` the generated `Expression` would be imported, precluding the need for module resolution down the road. PR Close #40948 |
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| .. | ||
| animations | ||
| bazel | ||
| benchpress | ||
| common | ||
| compiler | ||
| compiler-cli | ||
| core | ||
| docs | ||
| elements | ||
| examples | ||
| forms | ||
| language-service | ||
| localize | ||
| misc/angular-in-memory-web-api | ||
| platform-browser | ||
| platform-browser-dynamic | ||
| platform-server | ||
| private/testing | ||
| router | ||
| service-worker | ||
| upgrade | ||
| zone.js | ||
| BUILD.bazel | ||
| circular-deps-test.conf.js | ||
| empty.ts | ||
| goog.d.ts | ||
| license-banner.txt | ||
| README.md | ||
| system.d.ts | ||
| tsconfig-build-no-strict.json | ||
| tsconfig-build.json | ||
| tsconfig-test.json | ||
| tsconfig.json | ||
| types.d.ts | ||
Angular
The sources for this package are in the main Angular repo. Please file issues and pull requests against that repo.
Usage information and reference details can be found in Angular documentation.
License: MIT