Quicker typescript watch.

gulpfile.js

// A experiment for quicker builds.
gulp.task('watch:typescript:quick', function () {
    return gulp.watch(files.tsFiles).on("change", function(file) {
        // Workaround to keep original folder structure
        var currentDirectory = path.dirname(file.path);
        var sourceDirectory = 'scripts';
        var index = currentDirectory.indexOf(sourceDirectory);
        var relativeDirectory = currentDirectory.slice(index + sourceDirectory.length + 1);
        var outputDirectory = __dirname + "\\scripts\\output"
        if (relativeDirectory) {
            outputDirectory = outputDirectory + "\\" + relativeDirectory;
        }
        var cmd = '"' + __dirname + '\\node_modules\\.bin\\tsc.cmd" --target ES5 --module AMD --sourceMap true --noResolve --outDir "' + outputDirectory + '" "' + file.path + '"';
        var startD = new Date();
        console.log(startD.toTimeString().split(' ')[0] + ' - File change detected. Starting incremental compilation...');

        exec(cmd, function (err, stdout, stderr) {
            if (stderr) {
                console.log("Command Failed: " + stderr);
            } else {
                var endD = new Date();
                console.log(endD.toTimeString().split(' ')[0] + ' - Compilation complete. Watching for file changes.');
            }
        });
    });
});