Project reference isn't working if rootDir is set #868
Description
Expected Behaviour
A project reference that has a rootDir set should work properly
Actual Behaviour
'lambda-common' has outDir set to ./dist and rootDir set to ./src and 'lambda-graphql' references 'lambda-common':
Error: Could not find output JavaScript file for input ../lambda-common/src/index.ts (looked at ../lambda-common/dist/src/index.js).
The input file is part of a project reference located at ../lambda-common/tsconfig.json, so ts-loader is looking for the project’s pre-built output on disk. Try running `tsc --build` to build project references.
at successLoader (/lambda-graphql/node_modules/ts-loader/dist/index.js:46:19)
at Object.loader (/lambda-gaming/lambda-graphql/node_modules/ts-loader/dist/index.js:22:12)
ts-loader is looking for dist/src/index.js instead of dist/index.js
Steps to Reproduce the Problem
Create a project reference to a project that sets rootDir to some child folder like ./src, compile with tsc -b and then attempt to use ts-loader on the parent project.