# babel-destructuring

**Repository Path**: pg0xff/babel-destructuring

## Basic Information

- **Project Name**: babel-destructuring
- **Description**: 研究 Babel 编译解构赋值的策略变化
- **Primary Language**: JavaScript
- **License**: Apache-2.0
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2022-11-28
- **Last Updated**: 2022-12-28

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README


7.19.0 发版 Blog 没有解构赋值的修改内容： [https://babeljs.io/blog/2022/09/05/7.19.0](https://babeljs.io/blog/2022/09/05/7.19.0)

## 7.19.4 ##

### 【Spec Compliance】 ###

[Disallow rest object destructuring of null/undefined](https://github.com/babel/babel/pull/14985)

#### packages/babel-helpers/src/helpers.ts ####

[https://github.com/babel/babel/pull/14985/files#diff-c420e27a7a10eb6270909de636cbe150184447a47172e621c23ff26fefbfbba0](https://github.com/babel/babel/pull/14985/files#diff-c420e27a7a10eb6270909de636cbe150184447a47172e621c23ff26fefbfbba0)

![](./images/babel-helpers.helpers.ts.png)

#### packages/babel-plugin-proposal-object-rest-spread/src/index.ts ####

[https://github.com/babel/babel/pull/14985/files#diff-cb21a0edfb439e6233bec8db3103800ccb451c0eaeb2ea3386b013dc776fc4fc](https://github.com/babel/babel/pull/14985/files#diff-cb21a0edfb439e6233bec8db3103800ccb451c0eaeb2ea3386b013dc776fc4fc)

![](./images/babel-plugin-proposal-object-rest-spread.png)

#### packages/babel-plugin-transform-destructuring/src/util.ts ####

[https://github.com/babel/babel/pull/14985/files#diff-6427eed7e95cfa97e5ed7572605894129bb4816c6fca74c8e335188071dd4452](https://github.com/babel/babel/pull/14985/files#diff-6427eed7e95cfa97e5ed7572605894129bb4816c6fca74c8e335188071dd4452)

![](./images/babel-plugin-transform-destructuring.util.ts.png)

## packages\7.20\node_modules\@babel\plugin-transform-destructuring\lib\index.js ##

### buildObjectExcludingKeys 方法 ###

#### [Spec Compliance] 前 ####

	let value;
	if (keys.length === 0) {
	    const extendsHelper = useBuiltIns ? core.types.memberExpression(core.types.identifier("Object"), core.types.identifier("assign")) : addHelper("extends");
	    value = core.types.callExpression(extendsHelper, [core.types.objectExpression([]), core.types.cloneNode(objRef)]);
	}

#### [Spec Compliance] 后 ####

	let value;
	if (keys.length === 0) {
	    const extendsHelper = useBuiltIns ? core.types.memberExpression(core.types.identifier("Object"), core.types.identifier("assign")) : addHelper("extends");
	    value = core.types.callExpression(extendsHelper, [core.types.objectExpression([]), core.types.sequenceExpression([core.types.callExpression(addHelper("objectDestructuringEmpty"), [core.types.cloneNode(objRef)]), core.types.cloneNode(objRef)])]);
	}

    "@babel/plugin-transform-destructuring": "7.18.13",