# isv-babel-plugin-safe-member-expression

> safe member expression

Latest version **10.0.9** (published 2017-07-25) · 0 weekly downloads

## Install

```sh
npm install isv-babel-plugin-safe-member-expression
pnpm add isv-babel-plugin-safe-member-expression
yarn add isv-babel-plugin-safe-member-expression
bun add isv-babel-plugin-safe-member-expression
```

## Health

**Score 15/100 (F)** — status: abandoned.

Positive: no vulnerabilities.

Warnings: low downloads; no types; no esm support.

Negative: abandoned; low maintenance score.

## Facts

| | |
|---|---|
| Version | 10.0.9 |
| Published | 2017-07-25 |
| First published | 2017-07-19 |
| Weekly downloads | 0 |
| TypeScript types | none |
| Module format | CommonJS |
| Dependencies | 0 |
| Known vulnerabilities | 0 |
| Install scripts | no |
| Author | zhuoling.lcl |
| Maintainers | smalldragonluo |
| Keywords | babel-plugin |

## Links

- npm: https://www.npmjs.com/package/isv-babel-plugin-safe-member-expression
- npm.io page: https://npm.io/package/isv-babel-plugin-safe-member-expression

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## Recent versions

- 10.0.9 (latest) — 2017-07-25
- 10.0.8 — 2017-07-25
- 10.0.6 — 2017-07-25
- 10.0.5 — 2017-07-23
- 10.0.4 — 2017-07-23
- 10.0.3 — 2017-07-23
- 10.0.0 — 2017-07-23
- 0.0.13 — 2017-07-19
- 0.0.12 — 2017-07-19
- 0.0.11 — 2017-07-19
- 0.0.10 — 2017-07-19
- 0.0.8 — 2017-07-19
- 0.0.6 — 2017-07-19

## README

# babel-plugin-safe-member-expression

safe member expression

only auto enabled in BlockStatement

feature:

- Safer MemberExpression
- Safer CallExpression with MemberExpression
- Safer AssignmentExpression with MemberExpression

## 参数

#### match

默认值：`/\/src.*\.jsx?/i`

描述：只有被 match 中的文件路径才会进入插件转换

#### exclude

默认值：`/\/node_modules.*\.jsx?/i`

描述：被 exclude 匹配的路径不会进入插件转换

## Example

####  Safer MemberExpression

**In**

```js
const foo = hello['world'];
let hello = this.state['foo'].bar;
```

**Out**

```js
var _object, _object2, _object3;

const foo = hello == null ? null : hello['world'];
let hello = (_object = (_object2 = (_object3 = this) == null ? null : _object3.state) == null ? null : _object2['foo']) == null ? null : _object.bar;
```



#### Safer CallExpression with MemberExpression

**In**

```js
const data = this.foo.bar.ok();
```

**Out**

```js
var _object, _object2, _object3;

const data = (_object = (_object2 = (_object3 = this) == null ? null : _object3.foo) == null ? null : _object2.bar) == null ? null : _object.ok ? _object.ok() : null;
```



#### Safer AssignmentExpression with MemberExpression

**In**

```js
foo['bar'] = x.y;
x.y.z = 'xxx';
```

**Out**

```js
var _object;

(foo || (foo = {}))['bar'] = x == null ? null : x.y;
((_object = x || (x = {})).y || (_object.y = {})).z = 'xxx';
```



## Installation

```sh
$ npm install babel-plugin-safe-member-expression
```

## Usage

### Via `.babelrc` (Recommended)

**.babelrc**

```json
{
  "plugins": ["safe-member-expression"]
}
```

### Via CLI

```sh
$ babel --plugins safe-member-expression script.js
```

### Via Node API

```javascript
require("babel-core").transform("code", {
  plugins: ["safe-member-expression"]
});
```

---
_Source: https://npm.io/package/isv-babel-plugin-safe-member-expression · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._