Not producing relative sourceMappingUrl's with mapRoot

[agubler]

TypeScript Version(s): 2.1.0-dev.20160830 / 2.0.0 / 2.0.2

Code

{
    "compilerOptions": {
        "module": "commonjs",
        "target": "es5",
        "noImplicitAny": false,
        "mapRoot": "./_debug",
        "sourceMap": true
    }
}

const example = function(options: { option1: string, options2: any }) {
        //noop
}

export default example;

Running tsc -p .

Expected behavior:

"use strict";
var example = function (options) {
    //noop
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.default = example;
//# sourceMappingURL=_debug/main.js.map

Actual behavior:

"use strict";
var example = function (options) {
    //noop
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.default = example;
//# sourceMappingURL=/Users/user1/ts-rel-root/_debug/main.js.map

[matt-gadd]

This seems to affect sourceRoot in the same way unfortunately.

[saulshanabrook]

I would like to be able to use the mapRoot to change the sources field in the sourcemap, without making the sourceMappingURL absolute. This is an issue for us, because we build the typescript files in one place and then copy them to another before importing them. When we copy them, relative path in the sources field no longer correctly points to the source file. We can mitigate this by using the mapRoot, but then this changes the sourceMappingURL to be absolute, and points to the previous location, so then it is not picked up.

[mhegazy]

Should be fixed by #23989