Add an option to force source maps to use absolute paths?

Previous related issue: https://github.com/Microsoft/TypeScript/issues/23180

It seems VS2017 is incompatible with relative paths, when debugging a UWP app now tries to load source maps from the app URI and the host does not support it.

'WWAHost.exe' (Script): Loaded 'Script Code (MSAppHost/3.0)'. 
SourceMap ms-appx://6b826582-e42b-45b9-b4e6-dd210285d94b/js/require-config.js.map read failed: The URI prefix is not recognized..

Hard-coding the full path in tsconfig.json is not a good idea here, I hope we have an option to behave as 2.9.2 so that we can get the auto-resolved full path.

Edit: My tsconfig.json that works in TS2.9 but not in TS3.0:

{
  "compilerOptions": {
    "strict": true,
    "noEmitOnError": true,
    "removeComments": false,
    "sourceMap": true,
    "target": "es2017",
    "outDir": "js/",
    "mapRoot": "js/",
    "sourceRoot": "sources/",
    "emitBOM": true,
    "module": "amd",
    "moduleResolution": "node"
  },
  "exclude": [
    "node_modules",
    "wwwroot"
  ]
}

My failed trial to fix this: (removed mapRoot and changed sourceRoot)

{
  "compilerOptions": {
    "strict": true,
    "noEmitOnError": true,
    "removeComments": false,
    "sourceMap": true,
    "target": "es2017",
    "outDir": "js/",
    "sourceRoot": "../sources/",
    "emitBOM": true,
    "module": "amd",
    "moduleResolution": "node"
  },
  "exclude": [
    "node_modules",
    "wwwroot"
  ]
}

Start by reviewing the related issue and the reported tsconfig examples, then trace how TypeScript emits source maps and resolves mapRoot and sourceRoot. Done means an option can reproduce the TypeScript 2.9.2 absolute-path behavior for the reported UWP debugging case, with coverage for the relevant source-map output.