@babel/plugin-proposal-optional-chaining-assign

转换赋值表达式左侧的可选链。

¥Transform optional chaining on the left-hand side of assignment expressions.

示例

¥Example

input.js

function doSomething(maybeOptions) {
  maybeOptions?.retries = 5;
}

将转变为

¥will be transformed to

output.js

function doSomething(maybeOptions) {
  maybeOptions !== null && maybeOptions !== void 0 && maybeOptions.retries = 5;
}

安装

¥Installation

npm

npm install --save-dev @babel/plugin-proposal-optional-chaining-assign

Yarn

yarn add --dev @babel/plugin-proposal-optional-chaining-assign

pnpm

pnpm add --save-dev @babel/plugin-proposal-optional-chaining-assign

用法

¥Usage

使用配置文件（推荐）

¥With a configuration file (Recommended)

babel.config.json

{
  "plugins": [
    [
      "@babel/plugin-proposal-optional-chaining-assign",
      {
        "version": "2023-07"
      }
    ]
  ]
}

通过 Node API

¥Via Node API

JavaScript

require("@babel/core").transformSync("code", {
  plugins: [["@babel/plugin-proposal-optional-chaining-assign", {
      "version": "2023-07"
    }]],
});

选项

¥Options

假设

¥Assumptions

该插件受 noDocumentAll 假设的影响。

¥This plugin is affected by the noDocumentAll assumption.

version

必需的。

¥Required.

"2023-07"

选择要使用的提案：

¥Selects the proposal to use:

• "2023-07"：tc39/proposal-optional-chaining-assignment@49d055c44b 中定义的第一阶段提案在 2023 年 7 月的 TC39 会议上提出。

  ¥"2023-07": The stage 1 proposal as defined at tc39/proposal-optional-chaining-assignment@49d055c44b, presented in the July 2023 TC39 meeting.

参考

¥References

• 提议：可选的链接分配

  ¥Proposal: Optional Chaining Assignment