React + Gulp + Babelify - node.js

Question

I am trying to convert my working app from React and Gulp with ES5 to React + Gulp and ES6.
I only tried to replace reactify with babelify but i am still getting gulp error: Illegal import declaration
Here is my gulpfile.js:
"use strict";
var gulp = require('gulp');
var connect = require('gulp-connect'); //Runs a local dev server
var open = require('gulp-open'); //Open a URL in a web browser
var browserify = require('browserify'); // Bundles JS
var source = require('vinyl-source-stream'); // Use conventional text streams with Gulp
var concat = require('gulp-concat'); //Concatenates files
var lint = require('gulp-eslint'); //Lint JS files, including JSX
var babelify = require("babelify");
var config = {
port: 9005,
devBaseUrl: 'http://localhost',
paths: {
html: './src/*.html',
js: './src/**/*.js',
css: [
'node_modules/bootstrap/dist/css/bootstrap.min.css',
'node_modules/bootstrap/dist/css/bootstrap-theme.min.css',
'node_modules/toastr/toastr.css'
],
dist: './dist',
mainJs: './src/main.js'
}
}
//Start a local development server
gulp.task('connect', function() {
connect.server({
root: ['dist'],
port: config.port,
base: config.devBaseUrl,
livereload: true
});
});
gulp.task('open', ['connect'], function() {
gulp.src('dist/index.html')
.pipe(open({ uri: config.devBaseUrl + ':' + config.port + '/'}));
});
gulp.task('html', function() {
gulp.src(config.paths.html)
.pipe(gulp.dest(config.paths.dist))
.pipe(connect.reload());
});
gulp.task('js', function() {
browserify(config.paths.mainJs)
.transform(babelify)
.bundle()
.on('error', console.error.bind(console))
.pipe(source('bundle.js'))
.pipe(gulp.dest(config.paths.dist + '/scripts'))
.pipe(connect.reload());
});
gulp.task('css', function() {
gulp.src(config.paths.css)
.pipe(concat('bundle.css'))
.pipe(gulp.dest(config.paths.dist + '/css'));
});
gulp.task('lint', function() {
return gulp.src(config.paths.js)
.pipe(lint({config: 'eslint.config.json'}))
.pipe(lint.format());
});
gulp.task('watch', function() {
gulp.watch(config.paths.html, ['html']);
gulp.watch(config.paths.js, ['js', 'lint']);
});
gulp.task('default', ['html', 'js', 'css', 'lint', 'open', 'watch']);
and this is my js file (main.js):
"use strict";
var React = require('react');
var Router = require('react-router');
var routes = require('./routes');
import React from 'react';
Router.run(routes, function(Handler) {
React.render(<Handler/>, document.getElementById('app'));
});
Thanks a lot

Answer 1

You need to install babel preset
npm i babel-preset-es2015 --save-dev
and add config to .babelrc like this
{
"presets": [
"es2015"
]
}
Or it's better to use gulp-babel
$ npm install --save-dev gulp-babel babel-preset-es2015
const gulp = require('gulp');
const babel = require('gulp-babel');
gulp.task('default', () => {
return gulp.src('src/app.js')
.pipe(babel({
presets: ['es2015']
}))
.pipe(gulp.dest('dist'));
});
https://www.npmjs.com/package/gulp-babel