gulp-lazy-minify

This plugin is used to minify JS/CSS only when it's needed.

There are currently 2 conditions where minifying is not needed:

1. The source file is already minified
2. There exists a minified version of the source file in the same directory

Usage

var gulp = require('gulp');
var lazyMinify = require('gulp-lazy-minify');
 
gulp.task('default', function () {
    gulp.src(['sample/file1.js', 'sample/file2.js', 'sample/file3.min.js'])
        .pipe(lazyMinify())
        .pipe(gulp.dest('output'));
});

Assumptions:

1. A JS file is a file with extension .js
2. A CSS file is a file with extension .css
3. A minified file is a file where it has .min before the extension

JS minification uses gulp-uglify

CSS minififcation uses gulp-minify-css