gulp.js

'use strict';
var gulp = require('gulp');
var typescript = require('gulp-tsc');
var mocha = require('gulp-mocha');
var growl = require('gulp-notify-growl');
var async = require('async');

var notify = growl();

var paths = {
    typescript: ['src/**/*.ts'],
    test: ['test/**/*.js'],
    dest: 'app'
};

function compile() {
    gulp.src(paths.typescript)
        .pipe(typescript({sourcemap: true, emitError: false}))
        .pipe(gulp.dest(paths.dest))
        .on("error", notify.onError({
            message: "Error: <%= error.message %>",
            title: "Error compiling typescript"
        }));
}

function test() {
    gulp.src(paths.test)
        .pipe(mocha({reporter: 'spec'}))
        .on("error", notify.onError({
            message: "Error: <%= error.message %>",
            title: "Error running tests"
        }));
}

gulp.task('compile', function () {
    compile();
});

gulp.task('test', function () {
    test();
});

gulp.task('compileAndTest', function () {
    async.series([
        compile(),
        test()
    ]);
});

// Rerun the task when a file changes
gulp.task('watch', function () {
    gulp.watch(paths.typescript, ['compileAndTest']);
    gulp.watch(paths.test, ['test']);
});

gulp.task('default', ['compileAndTest', 'watch']);