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@babel/preset-react

此预设始终包含以下插件:

¥This preset always includes the following plugins:

使用 development 选项:

¥And with the development option:

经典运行时添加:

¥Classic runtime adds:

启用 development 选项时,自动运行时(自 v7.9.0 起)会自动为这些插件添加功能。如果你启用了自动运行时,添加 @babel/plugin-transform-react-jsx-self@babel/plugin-transform-react-jsx-source 将出错。

¥Automatic runtime (since v7.9.0) adds the functionality for these plugins automatically when the development option is enabled. If you have automatic runtime enabled, adding @babel/plugin-transform-react-jsx-self or @babel/plugin-transform-react-jsx-source will error.

注意:v7 中不再启用 Flow 语法支持。为此,你需要添加 Flow 预设

¥Note: Flow syntax support is no longer enabled in v7. For that, you will need to add the Flow preset.

安装

¥Installation

你还可以查看 React 入门页面

¥You can also check out the React Getting Started page

npm install --save-dev @babel/preset-react

用法

¥Usage

¥With a configuration file (Recommended)

没有选项:

¥Without options:

babel.config.json
{
"presets": ["@babel/preset-react"]
}

有选项:

¥With options:

babel.config.json
{
"presets": [
[
"@babel/preset-react",
{
"pragma": "dom", // default pragma is React.createElement (only in classic runtime)
"pragmaFrag": "DomFrag", // default is React.Fragment (only in classic runtime)
"throwIfNamespace": false, // defaults to true
"runtime": "classic" // defaults to classic
// "importSource": "custom-jsx-library" // defaults to react (only in automatic runtime)
}
]
]
}

通过 CLI

¥Via CLI

Shell
babel --presets @babel/preset-react script.js

通过 Node API

¥Via Node API

JavaScript
require("@babel/core").transformSync("code", {
presets: ["@babel/preset-react"],
});

选项

¥Options

两个运行时

¥Both Runtimes

runtime

classic | automatic,默认为 classic

¥classic | automatic, defaults to classic

添加于:v7.9.0

¥Added in: v7.9.0

注意:Babel 8 中默认运行时将切换为 automatic

¥Note: The default runtime will be switched to automatic in Babel 8.

决定使用哪个运行时。

¥Decides which runtime to use.

automatic 自动导入 JSX 转译成的函数。classic 不会自动导入任何东西。

¥automatic auto imports the functions that JSX transpiles to. classic does not automatic import anything.

development

boolean,默认为 false

¥boolean, defaults to false.

这会切换特定于开发的行为,例如添加 __source__self

¥This toggles behavior specific to development, such as adding __source and __self.

这在与 环境选项 配置或 js 配置文件 结合使用时很有用。

¥This is useful when combined with the env option configuration or js config files.

throwIfNamespace

boolean,默认为 true

¥boolean, defaults to true.

如果使用 XML 命名空间标记名称,则切换是否引发错误。例如:

¥Toggles whether or not to throw an error if a XML namespaced tag name is used. For example:

<f:image />

尽管 JSX 规范允许这样做,但默认情况下它是禁用的,因为 React 的 JSX 目前不支持它。

¥Though the JSX spec allows this, it is disabled by default since React's JSX does not currently have support for it.

pure

boolean,默认为 true

¥boolean, defaults to true.

启用 @babel/plugin-transform-react-pure-annotations。它将顶层 React 方法调用标记为纯摇树。

¥Enables @babel/plugin-transform-react-pure-annotations. It will mark top-level React method calls as pure for tree shaking.

React 自动运行时

¥React Automatic Runtime

importSource

string,默认为 react

¥string, defaults to react.

添加于:v7.9.0

¥Added in: v7.9.0

导入函数时替换导入源。

¥Replaces the import source when importing functions.

React 经典运行时

¥React Classic Runtime

pragma

string,默认为 React.createElement

¥string, defaults to React.createElement.

替换编译 JSX 表达式时使用的函数。它应该是限定名称(例如 React.createElement)或标识符(例如 createElement)。

¥Replace the function used when compiling JSX expressions. It should be a qualified name (e.g. React.createElement) or an identifier (e.g. createElement).

pragmaFrag

string,默认为 React.Fragment

¥string, defaults to React.Fragment.

替换编译 JSX 片段时使用的组件。它应该是一个有效的 JSX 标签名。

¥Replace the component used when compiling JSX fragments. It should be a valid JSX tag name.

useBuiltIns

boolean,默认为 false

¥boolean, defaults to false.

警告

这个选项将在 Babel 8 中被删除。如果你的目标是现代浏览器,请将 useBuiltIns 设置为 true

¥This option will be removed in Babel 8. Set useBuiltIns to true if you are targeting to modern browsers.

将使用原生内置而不是尝试为任何需要的插件填充行为。

¥Will use the native built-in instead of trying to polyfill behavior for any plugins that require one.

useSpread

boolean,默认为 false

¥boolean, defaults to false.

添加于:v7.7.0

¥Added in: v7.7.0

警告

这个选项将在 Babel 8 中被删除。如果你的目标是现代浏览器,请将 useSpread 设置为 true

¥This option will be removed in Babel 8. Set useSpread to true if you are targeting to modern browsers.

展开 props 时,直接使用带有展开元素的内联对象,而不是 Babel 的扩展助手或 Object.assign

¥When spreading props, use inline object with spread elements directly instead of Babel's extend helper or Object.assign.

babel.config.js

babel.config.js
module.exports = {
presets: [
[
"@babel/preset-react",
{
development: process.env.BABEL_ENV === "development",
},
],
],
};

babel.config.json

注意:env 选项可能很快就会被弃用

¥Note: the env option will likely get deprecated soon

babel.config.json
{
"presets": ["@babel/preset-react"],
"env": {
"development": {
"presets": [["@babel/preset-react", { "development": true }]]
}
}
}

你可以阅读有关配置预设选项 此处 的更多信息

¥You can read more about configuring preset options here