How to compile a project properly with Babel and Grunt
Question
I'm trying to play with Babel, but it doesn't work well for me.
My project is simple
|-project/
|---src/
|-----index.html
|-----main.js
|-----module.js
|---Gruntfile.js
|---package.json
index.html
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>Test</title>
<script src="main.js" type="application/javascript"></script>
</head>
<body>
<p>Simple html file.</p>
</body>
</html>
main.js
import * as math from "./module";
async function anwser() {
return 42;
}
(function main() {
anwser().then((v) => {
console.info(v);
});
console.log(math.sum(5, 5));
})();
module.js
export function sum(x, y) {
return x + y;
}
Gruntfile.js
module.exports = function(grunt) {
grunt.initConfig({
"babel": {
"options": {
"sourceMap": true,
"experimental": true
},
dist: {
files: [{
"expand": true,
"cwd": "src/",
"src": ["**/*.js"],
"dest": "build/",
"ext": ".js"
}]
}
},
htmlmin: {
dist: {
options: {
removeComments: true,
collapseWhitespace: true
},
files: [{
"expand": true,
"cwd": "src/",
"src": ["**/*.html"],
"dest": "build/",
"ext": ".html"
}]
}
},
watch: {
scripts: {
files: 'src/*.js',
tasks: ["babel"]
},
html: {
files: 'src/*.html',
tasks: ["htmlmin"]
}
}
});
grunt.loadNpmTasks('grunt-babel');
grunt.loadNpmTasks('grunt-contrib-watch');
grunt.loadNpmTasks('grunt-contrib-htmlmin');
grunt.registerTask("default", ["babel", "htmlmin"]);
};
I run grunt, everything compile. But I can't use have the expected result.
First, the browser say require is not defined , so I add require.js to my HTML.
Then, I get Error: Module name "module" has not been loaded yet for context: _. Use require([]) http://requirejs.org/docs/errors.html#notloaded Error: Module name "module" has not been loaded yet for context: _. Use require([]) http://requirejs.org/docs/errors.html#notloaded
I'm a bit confused about all of these. How I can make my code work?
3 answers
solution1
28 ACCPTED 2015-04-03 04:50:41
To expand on veg_prog's answer, you should use something like Browserify if you want to organize your code into modules. Browserify can be used with Grunt via grunt-browserify , and Babel can be used with Browserify via babelify .
I've tweaked some of your files to show you how it can be done:
index.html
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>Test</title>
<script src="bundle.js" type="application/javascript"></script>
</head>
<body>
<p>Simple html file.</p>
</body>
</html>
main.js
import "babelify/polyfill"; // Needed for Babel's experimental features.
import * as math from "./module";
async function anwser() {
return 42;
}
(function main() {
anwser().then((v) => {
console.info(v);
});
console.log(math.sum(5, 5));
})();
Gruntfile.js
module.exports = function(grunt) {
grunt.initConfig({
browserify: {
dist: {
options: {
transform: [["babelify", { "stage": 0 }]]
},
files: {
"build/bundle.js": "src/main.js"
}
}
},
htmlmin: {
dist: {
options: {
removeComments: true,
collapseWhitespace: true
},
files: [{
"expand": true,
"cwd": "src/",
"src": ["**/*.html"],
"dest": "build/",
"ext": ".html"
}]
}
},
watch: {
scripts: {
files: "src/*.js",
tasks: ["browserify"]
},
html: {
files: "src/*.html",
tasks: ["htmlmin"]
}
}
});
grunt.loadNpmTasks("grunt-browserify");
grunt.loadNpmTasks("grunt-contrib-watch");
grunt.loadNpmTasks("grunt-contrib-htmlmin");
grunt.registerTask("default", ["browserify", "htmlmin"]);
};
package.json
{
"devDependencies": {
"babelify": "6.0.1",
"grunt": "0.4.5",
"grunt-browserify": "3.6.0",
"grunt-contrib-htmlmin": "0.4.0",
"grunt-contrib-watch": "0.6.1"
}
}
solution2
13 2015-05-22 20:57:19
Babel uses 'common' by default. That doesn't work for requirejs. So, change modules to 'amd'.
"babel": {
"options": {
"sourceMap": true,
"experimental": true,
"modules": "amd" //This is the line to be added.
},
dist: {
files: [{
"expand": true,
"cwd": "src/",
"src": ["**/*.js"],
"dest": "build/",
"ext": ".js"
}]
}
}
Update for Babel6. See also http://babeljs.io/docs/plugins/transform-es2015-modules-amd/ and https://babeljs.io/docs/plugins/
"babel": {
"options": {
"sourceMap": true,
"experimental": true,
"plugins": ["transform-es2015-modules-amd"] //This is the line to be added.
},
dist: {
files: [{
"expand": true,
"cwd": "src/",
"src": ["**/*.js"],
"dest": "build/",
"ext": ".js"
}]
}
}
solution3
8 2015-03-28 06:24:53
First, the browser say require is not defined, so I add require.js to my HTML.
I don't think, that adding require.js will be the solution. In this context require is node-style syntax: ( https://github.com/substack/browserify-handbook#user-content-require ).
Browserify is a module loader but works different than requirejs. There is a babel distribution for requirejs, too ( https://github.com/mikach/requirejs-babel ) but I recommend using browserify.
In a setup, where babel is working with browserify, something like this
import $ from'jquery';
will become something like this
var $ = require('jquery');
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