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+# 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.