gulp如何配置将.html页面中的es6转成es5?

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <title></title>
</head>

<body>
  <script>
    let name = 'alibaba'
    let sayName = (params) => params + `${name}`
    sayName('I am ');
  </script>
</body>

</html>

用gulp打包,如何把如上代码,npm run build 执行之后转成es5语法,还有npm run dev 如何转成es5语法

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