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Gulp: Grabbing JavaScript assets from a CDN to add to your build pipeline
var gulp = require('gulp');
var source = require('vinyl-source-stream');
var request = require('request');
var merge = require('merge2');
var concat = require('gulp-concat');
var buffer = require('gulp-buffer');
/**
* 1. We request the latest jQuery version from the jQuery CDN. The
* request package allows for streaming. What we get in return
* is a readable stream.
* 2. We create a valid vinyl file object with vinyl source stream
* This makes it compatible with Gulp
* 3. Our main file is selected from the file system as usual
* 4. The merge2 package allows us to combine both streams
* 5. The contents of both streams are converted to text buffers
* so gulp-concat can handle them.
*/
gulp.task('js', function() {
var jquery = request('http://code.jquery.com/jquery-latest.js') /* 1 */
.pipe(source('jquery.js')); /* 2 */
var main = gulp.src('main.js'); /* 3 */
return merge(jquery, main) /* 4 */
.pipe(buffer()) /* 5 */
.pipe(concat('main.min.js'))
.pipe(gulp.dest('dist'));
})
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