vue-cli .babelrc配置问题

Question

平常.babelrc的presets相关配置直接写的是
presets:[es-2015,stage-x]
而最新用vue-cli下下来的模板却是

"presets": [
    ["env", { "modules": false }],
    "stage-2"
  ],

请问

 ["env", { "modules": false }]如何理解呢？

Answer 1

From: https://babeljs.io/docs/plugi...

Enable transformation of ES6 module syntax to another module type.

Setting this to false will not transform modules.

Answer 2

正常写法！[presets, {presets配置项}, presets, {presets配置项}]。或者是[presets, presets]

Answer 3

设置为false不会让使ES6模块语法转换到另一个模块类型。