score:17

Accepted answer

See fast browserify builds with watchify. Note that the only thing passed to browserify is the main entry point, and watchify's config.

The transforms are added to the watchify wrapper.

code from article pasted verbatim

var gulp = require('gulp');
var gutil = require('gulp-util');
var sourcemaps = require('gulp-sourcemaps');
var source = require('vinyl-source-stream');
var buffer = require('vinyl-buffer');
var watchify = require('watchify');
var browserify = require('browserify');

var bundler = watchify(browserify('./src/index.js', watchify.args));
// add any other browserify options or transforms here
bundler.transform('brfs');

gulp.task('js', bundle); // so you can run `gulp js` to build the file
bundler.on('update', bundle); // on any dep update, runs the bundler

function bundle() {
  return bundler.bundle()
    // log errors if they happen
    .on('error', gutil.log.bind(gutil, 'Browserify Error'))
    .pipe(source('bundle.js'))
    // optional, remove if you dont want sourcemaps
      .pipe(buffer())
      .pipe(sourcemaps.init({loadMaps: true})) // loads map from browserify file
      .pipe(sourcemaps.write('./')) // writes .map file
    //
    .pipe(gulp.dest('./dist'));
}

score:1

Many thanks to @PHaroZ for that answer. I had to modify a little bit that code for my needs though. I am working with ReactJS on Symfony2 framework and all my builds were taking 7s-21s!!! Crazy.. So that's what I have now:

var path = {
    OUT : 'app.js',
    DEST_BUILD : './src/MyBundle/Resources/js/dist',
    ENTRY_POINT : './src/MyBundle/Resources/js/src/app.js'
};

gulp.task('watch', [], function() {
    var bundler = browserify({
        entries : [ path.ENTRY_POINT ],
        extensions : [ ".js", ".jsx" ],
//        transform : [ 'reactify' ],
        debug : true,
        fullPaths : true,
        cache : {}, // <---- here is important things for optimization
        packageCache : {} // <----  and here
    }).transform("babelify", {presets: ["es2015", "react"]});
    bundler.plugin(watchify, {
//      delay: 100,
//      ignoreWatch: ['**/node_modules/**'],
//      poll: false
    });

    var rebundle = function() {
        var startDate = new Date();
        console.log('Update start at ' + startDate.toLocaleString());
        return bundler.bundle(function(err, buf){
                if (err){
                    console.log(err.toString());
                } else {
                    console.log(' updated in '+(new Date().getTime() - startDate.getTime())+' ms');
                }
            })
            .pipe(source(path.OUT))
            .pipe(gulp.dest(path.DEST_BUILD))
            ;
    };

    bundler.on('update', rebundle);
    return rebundle();
});

Now first compile takes around 20s and each time I update my file it takes around 800ms. It's just enough time to switch from IDE to my browser.

score:2

You have to use watchify and enable its cache. Take a look at : https://www.codementor.io/reactjs/tutorial/react-js-browserify-workflow-part-2 and for more optimisation when building source-map you could do that :

cd node_modules/browserify && npm i substack/browser-pack#sm-fast this would safe you half of time

part of my gulpfile.js

var gulp = require('gulp');
var uglify = require('gulp-uglify');
var htmlreplace = require('gulp-html-replace');
var source = require('vinyl-source-stream');
var browserify = require('browserify');
var watchify = require('watchify');
var reactify = require('reactify');
var streamify = require('gulp-streamify');

var path = {
    OUT : 'build.js',
    DEST2 : '/home/apache/www-modules/admimail/se/se',
    DEST_BUILD : 'build',
    DEST_DEV : 'dev',
    ENTRY_POINT : './src/js/main.jsx'
};

gulp.task('watch', [], function() {
    var bundler = browserify({
        entries : [ path.ENTRY_POINT ],
        extensions : [ ".js", ".jsx" ],
        transform : [ 'reactify' ],
        debug : true,
        fullPaths : true,
        cache : {}, // <---- here is important things for optimization 
        packageCache : {} // <----  and here
    });
    bundler.plugin(watchify, {
//      delay: 100,
//      ignoreWatch: ['**/node_modules/**'],
//      poll: false
    });

    var rebundle = function() {
        var startDate = new Date();
        console.log('Update start at ' + startDate.toLocaleString());
        return bundler.bundle(function(err, buf){
                if (err){
                    console.log(err.toString());
                } else {
                    console.log(' updated in '+(new Date().getTime() - startDate.getTime())+' ms');
                }
            })
            .pipe(source(path.OUT))
            .pipe(gulp.dest(path.DEST2 + '/' + path.DEST_DEV))
            ;
    };

    bundler.on('update', rebundle);
    return rebundle();
});

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

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