Usage of TypeScript compiler as a library

[bripkens]

Tool development could be simplified when the TypeScript compiler could be used as a library. The compiler currently does not check whether it is executed as a library (see tsc.ts).

To enable usage as a library the compiler could check whether it is executed as the main module. In addition, the ts variable should be exported. By doing this, module like typescript-api would become obsolete and tool development (like Browserify and Webpack integrations) would be easier.

[DanielRosenwasser]

We don't support consuming the compiler outright (i.e. using anything within tsc.ts), but we will support using it as an NPM module - see instructions on #372.

It's basically as simple as:

import ts = require("typescript");