Add optionality to catch bindings (#5956)

packages/babel-plugin-syntax-optional-catch-binding/.npmignore

@@ -0,0 +1,3 @@
+src
+test
+*.log

packages/babel-plugin-syntax-optional-catch-binding/README.md

@@ -0,0 +1,52 @@
+# babel-plugin-syntax-optional-catch-binding
+
+> This plugin allows Babel to parse optional catch bindings.
+
+## Example
+
+**Syntax**
+
+```javascript
+try {
+  throw 0;
+} catch {
+  doSomethingWhichDoesntCareAboutTheValueThrown();
+  console.log("Yay, code executes!");
+}
+```
+
+## Installation
+
+```sh
+npm install --save-dev babel-plugin-syntax-optional-catch-binding
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["syntax-optional-catch-binding"]
+}
+```
+
+### Via CLI
+
+```sh
+babel --plugins syntax-optional-catch-binding script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["syntax-optional-catch-binding"]
+});
+```
+
+## References
+
+* [Proposal: Optional Catch Binding for ECMAScript](https://github.com/babel/proposals/issues/7)

packages/babel-plugin-syntax-optional-catch-binding/package.json

@@ -0,0 +1,13 @@
+{
+  "name": "babel-plugin-syntax-optional-catch-binding",
+  "version": "7.0.0-alpha.15",
+  "description": "Allow parsing of optional catch bindings",
+  "repository": "https://github.com/babel/babel/tree/master/packages/babel-plugin-syntax-optional-catch-binding",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ],
+  "dependencies": {},
+  "devDependencies": {}
+}

packages/babel-plugin-syntax-optional-catch-binding/src/index.js

@@ -0,0 +1,7 @@
+export default function() {
+  return {
+    manipulateOptions(opts, parserOpts) {
+      parserOpts.plugins.push("optionalCatchBinding");
+    },
+  };
+}