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const gulp = require('gulp');
const browserify = require('browserify');
const watchify = require('watchify');
const buffer = require('vinyl-buffer');
const source = require('vinyl-source-stream');
const gutil = require('gulp-util');
const log = require('gulplog');
const uglify = require('gulp-uglify');
const sourcemaps = require('gulp-sourcemaps');
const reactify = require('reactify');
const jshint =        require('gulp-jshint');
const babel = require('gulp-babel');

var b = function() {
  return browserify({
    cache: {},
    packageCache: {},
    entries: ['./src/js/app.js'],
    debug: true,
    transform: ['reactify']
  });
};

var w = watchify(b());

w.on('log', gutil.log);

var bundle = function(pkg) {
  return pkg.bundle()
    .pipe(source('bundle.js'))
    .pipe(buffer())
    .pipe(sourcemaps.init({loadMaps: true}))
        // Add transformation tasks to the pipeline here.
        .pipe(jshint({
            esversion: 6
        }))
        .pipe(jshint.reporter('default'))
        .pipe(babel({
            presets: ['env']
        }))
        //.pipe(uglify())
        .on('error', log.error)
    .pipe(sourcemaps.write('./'))
    .pipe(gulp.dest('./dist/js'));
};

gulp.task('watch', function() {
  bundle(w);
  w.on('update', bundle.bind(null, w));
});

gulp.task('build', bundle.bind(null, b()));

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