Only pass through changed files

Files are passed through the whole pipe chain on every run by default. By using gulp-changed only changed files will be passed through. This can speed up consecutive runs considerably.

// npm install --save-dev gulp gulp-changed gulp-jscs gulp-uglify

var gulp = require('gulp');
var changed = require('gulp-changed');
var jscs = require('gulp-jscs');
var uglify = require('gulp-uglify');

// we define some constants here so they can be reused
var SRC = 'src/*.js';
var DEST = 'dist';

gulp.task('default', function() {
    return gulp.src(SRC)
        // the `changed` task needs to know the destination directory
        // upfront to be able to figure out which files changed
        .pipe(changed(DEST))
        // only files that has changed will pass through here
        .pipe(jscs())
        .pipe(uglify())
        .pipe(gulp.dest(DEST));
});

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