Rename all proposal plugins to -proposal- from -transform- (#6570)

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

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+src
+test
+*.log

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

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+# @babel/plugin-proposal-optional-catch-binding
+
+> Optional catch binding enables the catch block to execute whether or not an argument is passed to the catch statement (CatchClause).
+
+
+## Examples
+
+```js
+try {
+  throw 0;
+} catch {
+  doSomethingWhichDoesntCareAboutTheValueThrown();
+}
+```
+
+```js
+try {
+  throw 0;
+} catch {
+  doSomethingWhichDoesntCareAboutTheValueThrown();
+} finally {
+  doSomeCleanup();
+}
+```
+
+
+## Installation
+
+```sh
+npm install --save-dev @babel/plugin-proposal-optional-catch-binding
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["@babel/proposal-optional-catch-binding"]
+}
+```
+
+### Via CLI
+
+```sh
+babel --plugins @babel/proposal-optional-catch-binding script.js
+```
+
+### Via Node API
+
+```javascript
+require("@babel/core").transform("code", {
+  plugins: ["@babel/proposal-optional-catch-binding"]
+});
+```
+
+## References
+- [Proposal: Optional Catch Binding for ECMAScript](https://github.com/babel/proposals/issues/7)

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

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+{
+  "name": "@babel/plugin-proposal-optional-catch-binding",
+  "version": "7.0.0-beta.3",
+  "description": "Compile optional catch bindings",
+  "repository": "https://github.com/babel/babel/tree/master/packages/babel-plugin-proposal-optional-catch-binding",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ],
+  "dependencies": {
+    "@babel/plugin-syntax-optional-catch-binding": "7.0.0-beta.3"
+  },
+  "peerDependencies": {
+    "@babel/core": "7.0.0-beta.3"
+  },
+  "devDependencies": {
+    "@babel/helper-plugin-test-runner": "7.0.0-beta.3"
+  }
+}

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

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+import syntaxOptionalCatchBinding from "@babel/plugin-syntax-optional-catch-binding";
+
+export default function() {
+  return {
+    inherits: syntaxOptionalCatchBinding,
+
+    visitor: {
+      CatchClause(path) {
+        if (!path.node.param) {
+          const uid = path.scope.generateUidIdentifier("unused");
+          const paramPath = path.get("param");
+          paramPath.replaceWith(uid);
+        }
+      },
+    },
+  };
+}

packages/babel-plugin-proposal-optional-catch-binding/test/fixtures/optional-catch-bindings/exec.js

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+const test = () => {
+  try {
+    throw 0;
+  }
+  catch {
+    return true;
+  }
+}
+assert(test());
+
+const test2 = () => {
+  try {
+    throw 0;
+  }
+  catch (err) {
+    return true;
+  }
+}
+assert(test2());

packages/babel-plugin-proposal-optional-catch-binding/test/fixtures/optional-catch-bindings/try-catch-block-binding/actual.js

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+try {
+  throw 0;
+} catch (err) {
+  console.log("it failed, but this code executes");
+}

packages/babel-plugin-proposal-optional-catch-binding/test/fixtures/optional-catch-bindings/try-catch-block-binding/expected.js

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+try {
+  throw 0;
+} catch (err) {
+  console.log("it failed, but this code executes");
+}

packages/babel-plugin-proposal-optional-catch-binding/test/fixtures/optional-catch-bindings/try-catch-block-no-binding/actual.js

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+try {
+  throw 0;
+} catch {
+  console.log("it failed, but this code executes");
+}

packages/babel-plugin-proposal-optional-catch-binding/test/fixtures/optional-catch-bindings/try-catch-block-no-binding/expected.js

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+try {
+  throw 0;
+} catch (_unused) {
+  console.log("it failed, but this code executes");
+}

packages/babel-plugin-proposal-optional-catch-binding/test/fixtures/optional-catch-bindings/try-catch-finally-binding/actual.js

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+try {
+  throw 0;
+} catch (err) {
+  console.log("it failed, but this code executes");
+} finally {
+  console.log("this code also executes");
+}

packages/babel-plugin-proposal-optional-catch-binding/test/fixtures/optional-catch-bindings/try-catch-finally-binding/expected.js

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+try {
+  throw 0;
+} catch (err) {
+  console.log("it failed, but this code executes");
+} finally {
+  console.log("this code also executes");
+}

packages/babel-plugin-proposal-optional-catch-binding/test/fixtures/optional-catch-bindings/try-catch-finally-no-binding/actual.js

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+try {
+  throw 0;
+} catch {
+  console.log("it failed, but this code executes");
+} finally {
+  console.log("this code also executes");
+}

packages/babel-plugin-proposal-optional-catch-binding/test/fixtures/optional-catch-bindings/try-catch-finally-no-binding/expected.js

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+try {
+  throw 0;
+} catch (_unused) {
+  console.log("it failed, but this code executes");
+} finally {
+  console.log("this code also executes");
+}

packages/babel-plugin-proposal-optional-catch-binding/test/fixtures/options.json

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+{
+  "plugins": ["proposal-optional-catch-binding"]
+}

packages/babel-plugin-proposal-optional-catch-binding/test/index.js

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+import runner from "@babel/helper-plugin-test-runner";
+
+runner(__dirname);