message: chore: use eval source map for dev
diff: @@ -211,6 +211,10 @@ module.exports = (env, argv) => {
  config.mode = argv.mode;
  }
  + if (config.mode === 'development') {
  + config.devtool = 'eval-source-map';
  + }
  +
  if (argv.release) {
  version = packageJson.version;
  }
  