Duplicate identifier errors when using @types inside a Windows junction

[smrq]

TypeScript Version: 2.0.3

Code

• Install any type declaration from @types on npm. (For this example I am using @types/react, but this is also reproducible with other declaration files: @types/angular, @types/jquery, @types/lodash, etc.)
• Create a junction to the source folder.
• Then, navigate into the junction (instead of the real folder).
• Attempt to compile the following file:

import * as React from 'react';

A minimal reproducing repo with complete steps to reproduce is available here: https://github.com/smrq/tsc-junction-repro

Expected behavior:

Compiles without errors.

Actual behavior:

Compiles with the following errors:

C:/Code/tsc-junction-repro/node_modules/@types/react/index.d.ts(7,21): error TS2300: Duplicate identifier 'React'.
node_modules/@types/react/index.d.ts(7,21): error TS2300: Duplicate identifier 'React'.

[zkochan]

It would be really great if this was fixed.

As a consequence of this issue pnpm cannot currently be used for projects that use typescript@2 (related issue on pnpm).

By the way, pnpm is probably the only package manager written in TypeScript 😉

Please try to help us with this

[sompylasar]

Looks relevant to this: #6496