Compiler API to resolve path from ImportDeclaration

Hi there, since TS supports paths in tsconfig.json, is there an API in the compiler (Program, CompilerHost or something) to programmatically resolve real path of an import?

I wrote this transformer https://github.com/longlho/ts-transform-css-modules and it's tripping up on paths that are aliased in tsconfig.json, e.g:

import * as css from 'alias/foo.css'

tsconfig.json

{
  "compilerOptions": {
    "paths": {
      "alias/*": "../../../some_location/*"
    }
  }
}

I can try to manually reconstruct TS resolver but rather not to.

Thanks!

Start by reviewing the compiler's Program and CompilerHost APIs alongside the paths configuration behavior described in the issue. Compare the requested ImportDeclaration resolution with the existing TypeScript resolver, using the linked CSS-modules transformer as context. Done means the compiler exposes a supported way to resolve aliased import paths without manually reconstructing resolution.