Gruntfile.js

const webpack = require('webpack');

module.exports = function(grunt) {
  const pkg = grunt.file.readJSON('package.json');

  grunt.initConfig({
    pkg: pkg,

    copy: {
      main: {
        cwd: 'src/',
        src: '**',
        dest: 'dist/',
        expand: true
      },
      data: {
        cwd: 'data/',
        src: '**',
        dest: 'dist/data/',
        expand: true
      }
    },

    webpack: {
      options: {
        module: {
          loaders: [
            {
              test: /\.js$/,
              exclude: /node_modules/,
              loader: 'babel-loader',
              query: {
                presets: ['env'],
              }
            },
            {
              test: /\.js$/,
              loader: 'eslint-loader',
              exclude: [/node_modules/],
              options: {
                configFile: '.eslintrc'
              }
            }
          ],
        },
        plugins: [
          new webpack.BannerPlugin(
            `Hanzi Writer v${pkg.version}\nhttps://chanind.github.io/hanzi-writer`
          )
        ]
      },

      dist: {
        entry: './src/HanziWriter.js',
        output: {
          filename: 'dist/hanzi-writer.js',
          library: 'HanziWriter',
          libraryTarget: 'umd'
        }
      }
    },

    uglify: {
      dist: {
        options: {
          mangle: {
            properties: {
              regex: /^_/
            }
          },
          output: {
            preamble: `/*! Hanzi Writer v${pkg.version} | https://chanind.github.io/hanzi-writer */`
          }
        },
        files: {
          'dist/hanzi-writer.min.js': ['dist/hanzi-writer.js']
        }
      }
    },

    clean: {
      pre: ['dist'],
      post: [
        'dist/*',
        '!dist/hanzi-writer.js',
        '!dist/hanzi-writer.min.js',
        'dist/data/APL',
      ]
    },

    watch: {
      scripts: {
        files: ['src/**/*.js'],
        tasks: ['copy:main', 'webpack:dist', 'clean:post'],
        options: {
          spawn: false,
        },
      },
    }
  });

  grunt.loadNpmTasks('grunt-contrib-copy');
  grunt.loadNpmTasks('grunt-contrib-clean');
  grunt.loadNpmTasks('grunt-contrib-uglify');
  grunt.loadNpmTasks('grunt-contrib-watch');
  grunt.loadNpmTasks('grunt-webpack');

  grunt.registerTask('default', ['clean:pre', 'copy:main', 'copy:data', 'webpack:dist', 'uglify:dist', 'clean:post']);
};