tsconfig baseUrl in angular app not working

[yokots]

tsconfig baseUrl in angular app not working.

• VSCode Version: 1.15.0
• OS Version: macOS 10.12.5

Steps to Reproduce:

1. The tsdk version is 2.4.2.
2. The app is created by angular-cli, the src/tsconfig.app.json extend rootDirectory/tsconfig.json.
3. The src/tsconfig.app.json configure baseUrl with './'.
4. There are two ts files, src/environments/environment.ts and src/app/test.ts
5. In src/app/test.ts, Import { environments } from 'environments/environment', and it show cannot find module 'environments/environment'. but it can be compiled successfully.

Reproduces without extensions: Yes

[mjbvz]

We currently only pick up a config file if it is named tsconfig.json. The tsconfig.app.json project file is probably not being recognized at all in this case. Can you try renaming the file to tsconfig.json or creating an empty tsconfig.json that extends tsconfig.app.json

We are tracking support for specifying tsconfig files explicitly with #12463

[vscodebot]

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