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Chris Tate
24ef53ac23
Every file tsc-ts reads goes through scriptc's file system callbacks, including the ~80 files of tsc-ts's own default library directory: one round trip from the checker to the compiler and back for each. Those files belong to the installed tsc-ts (the build caches key on its executable's identity), and no build serves them differently. When tsc-ts takes --default-libraries-from-disk, the native compiler passes it to the checker it starts and to the shared checker server, so tsc-ts reads those files itself; every other path keeps the callbacks. Released tsc-ts versions reject the flag, so checker-features.ts asks each tsc-ts executable once (tsc-ts --api --default-libraries-from-disk with an empty input exits with 0 only when it knows the flag) and keeps the answer in the native cache, keyed by the executable's identity. With a tsc-ts that does not know the flag, builds run as before. Edit builds of small programs through the shared checker server are about 18 ms faster, and 6-9 ms faster without it.