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+# @babel/plugin-transform-block-scoping
+
+> Compile ES2015 block scoping (const and let) to ES5
+
+## Examples
+
+**In**
+
+```javascript
+{
+  let a = 3
+}
+
+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
+```
+
+## Usage
+
+### 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
+```
+
+### 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.