gulpfile.js

'use strict';

var env = process.env.NODE_ENV || 'development';
var gulp = require( 'gulp' );
var path = require( 'path' );
var $ = require( 'gulp-load-plugins' )();

gulp.task( 'tsc' , function (){
    return gulp.src( [ './app/src/build.ts' ] )
        .pipe( $.tsc( {
            target: 'ES5',
            out: 'out.js',
            outDir: '.tmp/src',
            emitError: true,
            declaration: true,
            removeComments: env === 'production'
        }))
        .pipe( gulp.dest( '.tmp/src' ) )
        .pipe( $.size( { title:'TypeScript size -> ' } ) )
        .on( 'error' , $.util.log );
});