Gruntfile.js

var fs = require('fs');

module.exports = function(grunt) {
  var bundlePath = 'build/cannon.js',
    minifiedBundlePath = 'build/cannon.min.js';

  grunt.initConfig({
    pkg: grunt.file.readJSON('package.json'),
    concat: {
      options: {
        separator: '\n\n'
      },

      demo: {
        src: ['src/demo/Demo.js'],
        dest: 'build/cannon.demo.js'
      }
    },

    browserify: {
      cannon: {
        src: ['src/Cannon.js'],
        dest: bundlePath,
        options: {
          browserifyOptions: {
            standalone: 'CANNON'
          }
        }
      }
    },

    babel: {
      options: {
        presets: ['@babel/preset-env']
      },
      dist: {
        files: {
          'build/cannon.babel.js': bundlePath
        }
      }
    },

    uglify: {
      build: {
        src: ['build/cannon.babel.js'],
        dest: minifiedBundlePath
      }
    },

    yuidoc: {
      compile: {
        name: '<%= pkg.name %>',
        description: '<%= pkg.description %>',
        version: '<%= pkg.version %>',
        url: '<%= pkg.homepage %>',
        options: {
          outdir: 'docs',
          paths: ['./src/']
        }
      }
    },

    nodeunit: {
      all: ['test/**/*.js']
    }
  });

  grunt.loadNpmTasks('grunt-babel');
  grunt.loadNpmTasks('grunt-contrib-uglify');
  grunt.loadNpmTasks('grunt-contrib-concat');
  grunt.loadNpmTasks('grunt-contrib-yuidoc');
  grunt.loadNpmTasks('grunt-contrib-nodeunit');
  grunt.loadNpmTasks('grunt-browserify');
  grunt.registerTask('default', [
    'test',
    'concat',
    'browserify',
    'babel',
    'uglify',
    'addLicense',
    'addDate',
    'requireJsFix'
  ]);
  grunt.registerTask('test', ['nodeunit']);

  grunt.registerTask(
    'addDate',
    'Adds the current date to the top of the built files',
    function() {
      var text = '// ' + new Date().toUTCString() + '\n';

      var dev = fs.readFileSync(bundlePath).toString();
      var min = fs.readFileSync(minifiedBundlePath).toString();

      fs.writeFileSync(bundlePath, text + '\n' + dev);
      fs.writeFileSync(minifiedBundlePath, text + '\n' + min);
    }
  );

  grunt.registerTask(
    'addLicense',
    'Adds the LICENSE to the top of the built files',
    function() {
      var text = fs.readFileSync('LICENSE').toString();

      var dev = fs.readFileSync(bundlePath).toString();
      var min = fs.readFileSync(minifiedBundlePath).toString();

      fs.writeFileSync(bundlePath, text + '\n' + dev);
      fs.writeFileSync(minifiedBundlePath, text + '\n' + min);
    }
  );

  // Not sure what flag Browserify needs to do this. Fixing it manually for now.
  grunt.registerTask(
    'requireJsFix',
    'Modifies the browserify bundle so it works with RequireJS',
    function() {
      [bundlePath, minifiedBundlePath].forEach(function(path) {
        var text = fs.readFileSync(path).toString();
        text = text.replace('define.amd', 'false'); // This makes the bundle skip using define() from RequireJS
        fs.writeFileSync(path, text);
      });
    }
  );
};