Source map sourceMappingURL doesn't take into account the path

[Vadorequest]

I have a file in /assets/scripts/widget/test/Api.ts which generates a file in /WebContent/scripts/widget/test/api.js, the last line is //# sourceMappingURL=Api.js.map

Since my grunt-typescript configuration is the following:

/**
 * Compile les fichiers TypeScript (ts) en JS.
 * Les recompile au même endroit que les fichiers TS.
 */
module.exports = function(grunt) {
    var config = require('./../config')();

    grunt.config.set('typescript', {
        recursive: {
            // Génère le fichier .js à côté du fichier .ts dans tous les sous-répertoires.
            src: [
                config.assetsScriptsDir + '/**/*.ts'
            ],
            dest: config.generatedScriptsDir,
            options: {
                target: 'es5',
                basePath: config.assetsScriptsDir,
                sourceMap: true,
                declaration: false,// Génère une erreur de compilation, en cours: https://github.com/k-maru/grunt-typescript/issues/93
                noEmitOnError: false// Force log errors.
            }
        }
    });

    grunt.loadNpmTasks('grunt-typescript');
};

It should rather be //# sourceMappingURL=widget/Api.js.map, isn't? How do I fix that?