grunt-ts

module.exports = function(grunt) {
    grunt.initConfig({
        ts: {
            dev: {                                 // a particular target
                src: ["app/assets/javascripts/**/*.ts"],        // The source typescript files, http://gruntjs.com/configuring-tasks#files
                html: ["app/assets/templates/**/*.tpl.html"], // The source html files, https://github.com/basarat/grunt-ts#html-2-typescript-support
                out: 'public/javascripts/app.js',                // If specified, generate an out.js file which is the merged js file
                watch: 'app/assets/javascripts',                     // If specified, watches this directory for changes, and re-runs the current target
                reference: 'app/assets/javascripts/references.ts',
                options: {                         // use to override the default options, http://gruntjs.com/configuring-tasks#options
                    target: 'es3',                 // 'es3' (default) | 'es5'
                    module: 'commonjs',            // 'amd' (default) | 'commonjs'
                    sourceMap: true,               // true (default) | false
                    declaration: false,            // true | false (default)
                    removeComments: true           // true (default) | false
                }
            }
        }
    });

    grunt.loadNpmTasks('grunt-ts');

    grunt.registerTask('default', ['ts']);
};