TypeScript: compilerOptions.types not respected when using project references

[OliverJAsh]

• VSCode Version: 10.27.2
• OS Version: macOS 10.13.6

Steps to Reproduce:

Full reproduction case

1. Given a tsconfig.json that has project references, where the referenced TS projects specify a custom compilerOptions.types
2. Open a file inside one of the referenced projects

Expected: VSCode should respect compilerOption.types.

Actual: VSCode appears to ignore compilerOption.types.

For example, I have three TS projects:

• tsconfig-src.json which should not have jest types (compilerOption.types is set to [])
• tsconfig-tests.json which should have jest types (compilerOption.types is set to ["jest"])
• tsconfig.json which references both of the above

The following file is part of the tsconfig-src.json project:

// src/sum.ts

test('foo', () => {})
// Expected: error in VSCode and when running `tsc -b`
// Actual: no error in VSCode, error when running `tsc -b`

export function sum(a: number, b: number) {
  return a + b;
}

When I run tsc -b -f tsconfig.json, I get the expected error:

src/sum.ts:3:1 - error TS2304: Cannot find name 'test'.

3 test('foo', () => {})
  ~~~~

(test is a global type provided by the jest types.)

However, VSCode has no error. Instead, the types appear to be available, even when they shouldn't:

You can try this for yourself with the provided full reproduction case.

[OliverJAsh]

Actually, this might not be confined to compilerOptions.types. I've also noticed other compiler options like noImplicitReturns are not respected.

[mjbvz]

This issue was moved to microsoft/TypeScript#27372