gpu.js/gulpfile.js

var gulp = require('gulp');
var concat = require('gulp-concat');
var rename = require("gulp-rename");
var uglify = require('gulp-uglify');
var gutil = require('gulp-util');

gulp.task('build', function() {
    return gulp.src([
			'src/wrapper/prefix.js',
			'src/parser.js',
			'src/texture.js',
			'src/gpu.js',
			'src/backend/functionNode_webgl.js',
			'src/backend/functionNode.js',
			'src/backend/functionBuilder.js',
			'src/backend/fallback.js',
			'src/backend/glsl.js',
			'src/wrapper/suffix.js'
		])
        .pipe(concat('gpu.js'))
        .pipe(gulp.dest('bin'));
});

gulp.task('minify', ['build'], function() {
    return gulp.src(['bin/gpu.js'])
        .pipe(rename('gpu.min.js'))
        .pipe(uglify({
            mangle: false,
            preserveComments: "license"
        }).on('error', gutil.log))
        .pipe(gulp.dest('bin'));
});

gulp.task('default', ['minify']);