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The template type-checking engine previously would assemble a type-checking program by inserting Type Check Blocks (TCBs) into existing user files. This approach proved expensive, as TypeScript has to re-parse and re-type-check those files when processing the type-checking program. Instead, a far more performant approach is to augment the program with a single type-checking file, into which all TCBs are generated. Additionally, type constructors are also inlined into this file. This is not always possible - both TCBs and type constructors can sometimes require inlining into user code, particularly if bound generic type parameters are present, so the approach taken is actually a hybrid. These operations are inlined if necessary, but are otherwise generated in a single file. It is critically important that the original program also include an empty version of the type-checking file, otherwise the shape of the two programs will be different and TypeScript will throw away all the old program information. This leads to a painfully slow type checking pass, on the same order as the original program creation. A shim to generate this file in the original program is therefore added. Testing strategy: this commit is largely a refactor with no externally observable behavioral differences, and thus no tests are needed. PR Close #29698 |
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Angular
Angular is a development platform for building mobile and desktop web applications using Typescript/JavaScript and other languages.
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