How to compile a project properly with Babel and Grunt

Question

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="https://stackoverflow.com/questions/28661499/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"
  }
}

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