How to block typescript 2.0 from walking up all parent directories while resolving modules?

Question

Upgraded to Typescript 2.0 (2.1.6) and it started giving "Duplicate identifier" errors. After taking a closer look it turned out that Typescript started importing @types from all upper directories (essentially other projects).

What should be the configuration to let Typescript to ignore upper node_modules?

src
 └── node_modules << *** how to ignore it? ***
     └── @types

 └── my.app << *** how to build this folder and down only? ***
         └── node_modules
             └── @types

EDIT: Here is an example of error I'm getting:

typings/globals/mocha/index.d.ts(30,13): error TS2300: Duplicate identifier 'describe'. ../../../node_modules/@types/jasmine/index.d.ts(9,18): error TS2300: Duplicate identifier 'describe'.

listFiles: true shows @types/jasmine being imported from upper folder:

C:/src/<project>/<folder>/<my.app>/typings/globals/mocha/index.d.ts
C:/src/node_modules/@types/jasmine/index.d.ts

If I rename upper node_modules folder then build succeeds.

Answer 1

The official documentation specifies that node_modules in current directory and all parents will be traversed unless you specify typeRoots.

So in theory, the answer should be this:

{
  "compilerOptions": {
    "typeRoots": [
      "./node_modules/@types"
    ]
  }
}

Since you still want to include the types from the current directory.

Unfortunately this doesn't seem to work correctly for me.

Answer 2

In this helps anyone, setting "types": [] in my tsconfig.json worked for me. See this github comment.

https://github.com/Microsoft/TypeScript/issues/13992#issuecomment-279020210