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@babel/plugin-transform-logical-assignment-operators

info

这个插件包含在 @babel/preset-env 中，在 ES2021

示例​

🌐 Example

在

JavaScript
a ||= b;
obj.a.b ||= c;

a &&= b;
obj.a.b &&= c;

出

JavaScript
var _obj$a, _obj$a2;

a || (a = b);
(_obj$a = obj.a).b || (_obj$a.b = c);

a && (a = b);
(_obj$a2 = obj.a).b && (_obj$a2.b = c);

使用 Nullish 合并​

🌐 With Nullish Coalescing

使用 @babel/plugin-transform-nullish-coalescing-operator 插件（包含在 @babel/preset-env 中）时

JavaScript
a ??= b;
obj.a.b ??= c;
JavaScript
var _a, _obj$a, _obj$a$b;

(_a = a) !== null && _a !== void 0 ? _a : (a = b);
(_obj$a$b = (_obj$a = obj.a).b) !== null && _obj$a$b !== void 0
  ? _obj$a$b
  : (_obj$a.b = c);

安装​

🌐 Installation

npm install --save-dev @babel/plugin-transform-logical-assignment-operators

用法​

🌐 Usage

🌐 With a configuration file (Recommended)

babel.config.json
{
  "plugins": ["@babel/plugin-transform-logical-assignment-operators"]
}

通过 CLI​

🌐 Via CLI

Shell
babel --plugins @babel/plugin-transform-logical-assignment-operators script.js

通过 Node API​

🌐 Via Node API

JavaScript
require("@babel/core").transformSync("code", {
  plugins: ["@babel/plugin-transform-logical-assignment-operators"],
});

参考​

🌐 References