gulpfile.js

var gulp = require('gulp');
var react = require('gulp-react');
var browserify = require('gulp-browserify');
var uglify = require('gulp-uglify');

gulp.task('jsx', function () {
    return gulp.src('./src/**/*.jsx')
        .pipe(react({harmony: true}))
        .pipe(browserify({insertGlobals : true}))
        .pipe(uglify())
        .pipe(gulp.dest('./lib'));
});

gulp.task('watch', function() {
    gulp.watch('src/**/*.jsx', ['jsx']);
});

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