Remote sourcemappingurl support

Bug Report or Feature Request (mark with an x)

- [ ] bug report -> please search issues before submitting
- [X] feature request

Desired functionality.

I’d like to be able to have a the options intsconfig.compilerOptions.* that pertain to sourceMap config to be configurable.

I’m trying to build production assets that have a sourceMapping like the following

//# sourceMappingURL=http://localhost:4200/inline.bundle.js.map

to facilitate debugging by developers in production environments.

To do this I expected to be able to change the tsconfig.compilerOptions.mapRoot to http://localhost:4200/. However it looks like

https://github.com/angular/angular-cli/blob/master/packages/@ngtools/webpack/src/angular_compiler_plugin.ts#L187-L201

    if (options.sourceMap) {
      this._compilerOptions.sourceMap = true;
      this._compilerOptions.inlineSources = true;
      this._compilerOptions.inlineSourceMap = false;
      this._compilerOptions.mapRoot = undefined;
      // We will set the source to the full path of the file in the loader, so we don't
      // need sourceRoot here.
      this._compilerOptions.sourceRoot = undefined;
    } else {
      this._compilerOptions.sourceMap = false;
      this._compilerOptions.sourceRoot = undefined;
      this._compilerOptions.inlineSources = undefined;
      this._compilerOptions.inlineSourceMap = undefined;
      this._compilerOptions.mapRoot = undefined;
      this._compilerOptions.sourceRoot = undefined;
    }

Overrides the config and doesn’t honor what’s in the tsconfig.json

Thoughts and opinions appreciated.

[felixtsai]

+1 for this. Trying to set up private sourcemaps for production error reporting.

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