Add ability to generate ambient declarations for external commonjs modules

[basarat]

Badly needed for commonjs modules where you are more likely to ship JS code plus a generated .d.ts file.

From codeplex : https://typescript.codeplex.com/workitem/2080

[basarat]

current workaround : https://github.com/TypeStrong/dts-bundle and https://github.com/TypeStrong/grunt-dts-bundle

[xealot]

This is related to, if not a duplicate of #575

Also I completely agree with emphasis. This is by far the biggest road block when trying to make use of Typescript within our organization.

[sccolbert]

Absolutely 👍

The dts-bundle package (an admitted kludge) is the only way I was able to find to make commonjs modules resusable across projects. It was painful enough that I just switched to internal modules and shoved all the dependency management into my build script. Would be awesome to have commonjs modules "just work".

[KeithWoods]

I believe this is a duplicate of, or very related to #17

We're using dts-bundle to get around this, it'd be great to have compiler support.

[niemyjski]

+1. We really really really need this.

[OvidiuGuta]

+1. It would be really useful.

[vvakame]

👍
We need tsc allow below syntax.

$ cat index.d.ts
// hand assemble
declare module "foobar" {
  export * from "./lib/main";
}

but, now we got below error message.

$ tsc --module commonjs index.d.ts
index.d.ts(3,3): error TS2439: Import or export declaration in an ambient module declaration cannot reference module through relative module name.

[mribichich]

+1

[basarat]

Now that the compiler supports node module resolution this can be closed as far as I am concerned 🌹

[RyanCavanaugh]

If @basarat says it's good it's good with me too 😃