Alex Rickabaugh 37c5a26421 perf(ivy): switch ngtsc to use single-file emit (#29147)
In the TypeScript compiler API, emit() can be performed either on a single
ts.SourceFile or on the entire ts.Program simultaneously.

ngtsc previously used whole-program emit, which was convenient to use while
spinning up the project but has a significant drawback: it causes a type
checking operation to occur for the whole program, including .d.ts files.
In large Bazel environments (such as Google's codebase), an ngtsc invocation
can have a few .ts files and thousands of .d.ts inputs. This unwanted type
checking is therefore a significant drain on performance.

This commit switches ngtsc to emit each .ts file individually, avoiding the
unwanted type checking.

PR Close #29147
2019-03-08 11:56:46 -08:00
2019-01-11 11:15:59 -08:00

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