tsc --build with rootDir and outDir is compiling files within a project in alphabetical order, breaking imports

[rosslovas]

TypeScript Version: 3.1.0-dev.20180721

Search Terms: tsc build project reference rootDir outDir

Code

Brief summary: When rootDir and outDir are involved as well as a project reference, source files within an individual project that has a dependency project would be compiled in alphabetical order. The consequence is that an A.ts that imports from B.ts will fail with Output file '.../B.d.ts' has not been built from source file '.../B.ts' but if I rename A.ts to C.ts everything works, as does removing the project reference or not using root/outDir.

The setup is hard to fully convey through text so here's a zip: repro.zip. npm install then npm run build to trigger the issue.

Expected behavior: Compiles both main and other projects successfully regardless of the names of the source files.

Actual behavior:

error TS6305: Output file '.../B.d.ts' has not been built from source file '.../B.ts'.

[hwillson]

I was just hit by this as well - exact same issue, and the reproduction is bang on what I'm seeing. Let me know if there's anything I can do to help expedite this (PR, tests, another repro, test a beta, etc.). Thanks!

[rifler]

This is broken in 3.8.0-beta

[resynth1943]

This is broken. Again.

Version 3.7.5 and 3.7.4.

[theseyi]

This is broken in 3.7.5