# babel-plugin-transform-es2015-block-scoping

> Compile ES2015 block scoping (const and let) to ES5

Latest version **6.26.0** (published 2017-08-16) · MIT license · 0 weekly downloads

## Install

```sh
npm install babel-plugin-transform-es2015-block-scoping
pnpm add babel-plugin-transform-es2015-block-scoping
yarn add babel-plugin-transform-es2015-block-scoping
bun add babel-plugin-transform-es2015-block-scoping
```

## Health

**Score 35/100 (D)** — status: abandoned.

Positive: no vulnerabilities; high maintenance score; popular repo.

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

Negative: abandoned.

## Facts

| | |
|---|---|
| Version | 6.26.0 |
| Published | 2017-08-16 |
| First published | 2015-10-29 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | none |
| Module format | CommonJS |
| Dependencies | 5 |
| Known vulnerabilities | 0 (+1 in 1 direct dependencies) |
| Install scripts | no |
| GitHub stars | 43992 |
| Maintainers | thejameskyle, sebmck, danez, hzoo, loganfsmyth |
| Keywords | babel-plugin |

## Links

- npm: https://www.npmjs.com/package/babel-plugin-transform-es2015-block-scoping
- Repository: https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-es2015-block-scoping
- npm.io page: https://npm.io/package/babel-plugin-transform-es2015-block-scoping

## Dependencies (5)

- [lodash](https://npm.io/package/lodash.md) ^4.17.4
- [babel-types](https://npm.io/package/babel-types.md) ^6.26.0
- [babel-runtime](https://npm.io/package/babel-runtime.md) ^6.26.0
- [babel-template](https://npm.io/package/babel-template.md) ^6.26.0
- [babel-traverse](https://npm.io/package/babel-traverse.md) ^6.26.0

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## Recent versions

- 6.26.0 (latest) — 2017-08-16
- 7.0.0-beta.3 (next) — 2017-10-15
- 7.0.0-beta.2 — 2017-09-26
- 7.0.0-beta.1 — 2017-09-19
- 7.0.0-beta.0 — 2017-09-12
- 7.0.0-alpha.20 — 2017-08-30
- 7.0.0-alpha.19 — 2017-08-07
- 7.0.0-alpha.18 — 2017-08-03
- 7.0.0-alpha.17 — 2017-07-26
- 7.0.0-alpha.16 — 2017-07-25
- 7.0.0-alpha.15 — 2017-07-12
- 7.0.0-alpha.14 — 2017-07-12
- 7.0.0-alpha.12 — 2017-05-31
- 7.0.0-alpha.11 — 2017-05-31
- 7.0.0-alpha.10 — 2017-05-25
- … 36 more at https://npm.io/package/babel-plugin-transform-es2015-block-scoping/versions

## README

# babel-plugin-transform-es2015-block-scoping

> Compile ES2015 block scoping (const and let) to ES5

## Installation

```sh
npm install --save-dev babel-plugin-transform-es2015-block-scoping
```

## Usage

### Via `.babelrc` (Recommended)

**.babelrc**

Without options:

```json
{
  "plugins": ["transform-es2015-block-scoping"]
}
```

With options:

```json
{
  "plugins": [
    ["transform-es2015-block-scoping", {
      "throwIfClosureRequired": true
    }]
  ]
}
```

### Via CLI

```sh
babel --plugins transform-es2015-block-scoping script.js
```

### Via Node API

```javascript
require("babel-core").transform("code", {
  plugins: ["transform-es2015-block-scoping"]
});
```

## Options `throwIfClosureRequired`

In cases such as the following it's impossible to rewrite let/const without adding an additional function and closure while transforming:

```javascript
for (let i = 0; i < 5; i++) {
  setTimeout(() => console.log(i), 1);
}
```

In extremely performance-sensitive code, this can be undesirable. If `"throwIfClosureRequired": true` is set, Babel throws when transforming these patterns instead of automatically adding an additional function.

---
_Source: https://npm.io/package/babel-plugin-transform-es2015-block-scoping · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._