], () =>
		gulp.src([
			'./assets/**/*',
			'./src/client/assets/**/*',
			'./src/client/app/*/assets/**/*'
		])
			.pipe(isProduction ? (imagemin as any)() : gutil.noop())
			.pipe(rename(path => {
				path.dirname = path.dirname.replace('assets', '.');
			}))
			.pipe(gulp.dest('./built/client/assets/'))

gulp.task('build:client:script', () => {
	const client = require('./built/client/meta.json');
	return gulp.src(['./src/client/app/boot.js', './src/client/app/safe.js'])
		.pipe(replace('VERSION', JSON.stringify(client.version)))
		.pipe(replace('API', JSON.stringify(config.api_url)))
		.pipe(replace('ENV', JSON.stringify(env)))
		.pipe(replace('LANGS', JSON.stringify(Object.keys(locales))))
		.pipe(isProduction ? uglify({
			toplevel: true
		} as any) : gutil.noop())
		.pipe(gulp.dest('./built/client/assets/'));
});

gulp.task('build', function() {
  console.info('compiling ts')
  console.time('compilation done')
  var tsResult = gulp.src(tsConfig.filesGlob)
        .pipe(sourcemaps.init())
				.pipe(ts(tsProject))
        .on('error', function(e:any){errorCount++; lastTsErrorMsg = e.message})
  return merge([
        tsResult.dts.pipe(gulp.dest(tsConfig.compilerOptions.outDir)),
        tsResult.js.pipe(gulp.dest(tsConfig.compilerOptions.outDir)).on('end', function(){'ts compilation done'}),
        tsResult.pipe(sourcemaps.write('./'))
          .pipe(gulp.dest(tsConfig.compilerOptions.outDir))
    ])
    .pipe(util.noop())//fake pipe needed, otherwise there is no on-end event
    .on('end', function(){
      console.timeEnd('compilation done')
      if (lastTsErrorMsg) {
        notifier.notify({title: 'Server Compilation Errors (' + errorCount + ')', message: lastTsErrorMsg.replace(removeColorsReg, '')})
        lastTsErrorMsg = null; errorCount = 0;
      } else {
        notifier.notify({title: 'Server',message:'Compilation finished'})
      }
    })
})

 (streamProvider:Function):NodeJS.WritableStream =>
     condition ? streamProvider() : noop();