Gulp task to diff files in the stream against a destination.
An example jsbeautify verification task to show diffs from js-beautify
'use strict';vargulp=require('gulp');varprettify=require('gulp-jsbeautifier');vardiff=require('gulp-diff');gulp.task('js-beautify',function(){returngulp.src(['!node_modules/**/*.js','**/*.js']).pipe(prettify({config: '.jsbeautifyrc',mode: 'VERIFY_AND_WRITE'})).pipe(diff(/* 'target directory to diff against', defaults to diff against original source file */))// emit an error on finding diffs.pipe(diff.reporter({fail: true}));});