TypeScript Version: 3.1.0-dev.20180830

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Code

src/tsconfig.json

{
  "compilerOptions": {"composite": true},
  "include": ["."]
}

test/tsconfig.json

{
  "references": [{"path": "../src"}]
}

Calling ts.createProgram on test/tsconfig.json with a custom CompilerHost that doesn't implement the optional method readDirectory.

Expected behavior:

Some kind of error or warning when passing projectReferences to ts.createProgram without implementing CompilerHost#readDirectory. I wondered what is wrong and only found this implementation detail by chance.

Actual behavior:

The ResolvedProjectReference returned from program.getProjectReferences() has an empty fileNames array.

https://github.com/Microsoft/TypeScript/blob/828279b611978e081eba0de1a1c126e415e306dd/src/compiler/program.ts#L2816