move some babel-plugins into the main repo

packages/babel-plugin-jscript/.npmignore

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+node_modules
+*.log
+src

packages/babel-plugin-jscript/README.md

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+# babel-plugin-jscript
+
+Babel plugin to fix buggy JScript named function expressions
+
+## Installation
+
+```sh
+$ npm install babel-plugin-jscript
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["jscript"]
+}
+```
+
+### Via CLI
+
+```sh
+$ babel --plugins jscript script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["jscript"]
+});
+```

packages/babel-plugin-jscript/package.json

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+{
+  "name": "babel-plugin-jscript",
+  "version": "1.0.4",
+  "description": "Babel plugin to fix buggy JScript named function expressions",
+  "repository": "babel-plugins/babel-plugin-jscript",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ]
+}

packages/babel-plugin-jscript/src/index.js

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+export default function ({ Plugin, types: t }) {
+  return new Plugin("jscript", {
+    metadata: {
+      group: "builtin-trailing"
+    },
+    
+    visitor: {
+      FunctionExpression: {
+        exit(node) {
+          if (!node.id) return;
+          node._ignoreUserWhitespace = true;
+
+          return t.callExpression(
+            t.functionExpression(null, [], t.blockStatement([
+              t.toStatement(node),
+              t.returnStatement(node.id)
+            ])),
+            []
+          );
+        }
+      }
+    }
+  });
+}