Barrelsby as an plugin/extension to the TypeScript compiler's module resolution

[bencoveney]

There are a couple of aspects of Barrelsby that I think could be improved by the ability to hook into they TypeScript compiler's module resolution.

• Generating lots of barrels can help simplify your real code but contribute some level of noise to the codebase.
• There may be a delay while barrelsby includes new .ts files before the TypeScript compiler can start compiling them as part of your application.

It would be great if we could hook into the TypeScript compiler's module resolution so that:

• The barrel files could be "virtual" and not exist on disk.
• There is no delay for the TypeScript compiler in accessing barrels or the files they contain.

Potentially this could be achieved using one of the following methods:

• Custom module resolution API
• Proposed compiler plugins

Distributing an extended TypeScript compiler may come with its own issues:

• Keeping up with TypeScript's release schedule so that Barrelsby users get new TypeScript versions.
• Not all build tools for TypeScript compilation may allow use of a custom TypeScript compiler.
• Our extended compiler may prevent people using a TypeScript compiler extend in other ways.

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[zaguiini]

Just want to say that I actually made this idea a reality: https://github.com/zaguiini/typescript-virtual-barrel.