@babel/plugin-transform-block-scoping - npm Package Compare versions

Comparing version 7.0.0-beta.49 to 7.0.0-beta.50

package.json

		{
		"name": "@babel/plugin-transform-block-scoping",
		"version": "7.0.0-beta.49",
		"version": "7.0.0-beta.50",
		"description": "Compile ES2015 block scoping (const and let) to ES5",
		@@ -9,3 +9,3 @@ "repository": "https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-block-scoping",
		"dependencies": {
		"@babel/helper-plugin-utils": "7.0.0-beta.49",
		"@babel/helper-plugin-utils": "7.0.0-beta.50",
		"lodash": "^4.17.5"
		@@ -20,5 +20,5 @@ },
		"devDependencies": {
		"@babel/core": "7.0.0-beta.49",
		"@babel/helper-plugin-test-runner": "7.0.0-beta.49"
		"@babel/core": "7.0.0-beta.50",
		"@babel/helper-plugin-test-runner": "7.0.0-beta.50"
		}
		}

README.md

		@@ -5,100 +5,16 @@ # @babel/plugin-transform-block-scoping

		## Examples
		See our website [@babel/plugin-transform-block-scoping](https://new.babeljs.io/docs/en/next/babel-plugin-transform-block-scoping.html) for more information.

		In
		## Install

		```javascript
		{
		let a = 3
		}
		Using npm:

		let a = 3
		```

		Out

		```javascript
		{
		var _a = 3;
		}

		var a = 3;
		```

		## Constant checks

		This plugin also validates all `const` variables.
		Reassignment of constants is a runtime error and it will insert the necessary error code for those.

		## Installation

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

		## Usage
		or using yarn:

		### Via `.babelrc` (Recommended)

		.babelrc

		Without options:

		```json
		{
		"plugins": ["@babel/plugin-transform-block-scoping"]
		}
		```

		With options:

		```json
		{
		"plugins": [
		["@babel/plugin-transform-block-scoping", {
		"throwIfClosureRequired": true
		}]
		]
		}
		```

		### Via CLI

		```sh
		babel --plugins @babel/plugin-transform-block-scoping script.js
		yarn add --save @babel/plugin-transform-block-scoping
		```

		### Via Node API

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

		## Options

		### `throwIfClosureRequired`
		`boolean`, defaults to `false`.

		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.

		### `tdz`
		`boolean`, defaults to `false`.

		By default this plugin will ignore the temporal dead zone (TDZ) for block-scoped variables. The following code will not throw an error when transpiled with Babel, which is not spec compliant:

		```javascript
		i
		let i;
		```

		If you need these errors you can tell Babel to try and find them by setting `"tdz": true` for this plugin. However, the current implementation might not get all edge cases right and its best to just avoid code like this in the first place.

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@babel/plugin-transform-block-scoping - npm Package Compare versions

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