从 Babel v7 开始,所有针对处于标准提案阶段的功能所编写的预设(stage preset)都已被弃用。 请查看 此篇博客文章 了解更多信息。
有关升级说明,请参与 这份 README。
The gist of Stage 3 is:
Stage 3: candidate
What is it? The proposal is mostly finished and now needs feedback from implementations and users to progress further.
What’s required? The spec text must be complete. Designated reviewers (appointed by TC39, not by the champion) and the ECMAScript spec editor must sign off on the spec text. There must be at least two spec-compliant implementations (which don’t have to be enabled by default).
What’s next? Henceforth, changes should only be made in response to critical issues raised by the implementations and their use.
Install
Js中文网 – 前端进阶资源教程 www.javascriptC.com ,Babel中文文档
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sh
npm install --save-dev @babel/preset-stage-3
Usage
Via .babelrc
(Recommended)
.babelrc
json
{
"presets": ["@babel/preset-stage-3"]
}
Via CLI
sh
babel script.js --presets @babel/preset-stage-3
Via Node API
javascript
require("@babel/core").transform("code", {
presets: ["@babel/preset-stage-3"]
});
Options
loose
boolean
, defaults to false
.
Enable "loose" transformations for any plugins in this preset that allow them.
useBuiltIns
boolean
, defaults to false
.
Will use the native built-in instead of trying to polyfill behavior for any plugins that require one.
References
- Chapter "The TC39 process for ECMAScript features" in "Exploring ES2016 and ES2017" by Axel Rauschmayer
来源:Js中文网 – 前端进阶资源教程
链接:https://www.javascriptc.com/docs/babel-manual/babel-preset-stage-3