Added jsx-self babel transform plugin

packages/babel-plugin-transform-react-jsx-self/.npmignore

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+node_modules
+*.log
+src
+test

packages/babel-plugin-transform-react-jsx-self/README.md

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+# babel-plugin-transform-react-jsx-self
+
+Adds `__self` prop to JSX elements, which React will use to generate some runtime warnings.  All React users
+should enable this transform in dev mode.
+
+## Example
+
+###In
+
+```
+<sometag />
+```
+###Out
+
+```
+<sometag __self={this} />
+```
+
+## Installation
+
+```sh
+$ npm install babel-plugin-transform-react-jsx-self
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["transform-react-jsx-self"]
+}
+```
+
+### Via CLI
+
+```sh
+$ babel --plugins transform-react-jsx-self script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["transform-react-jsx-self"]
+});
+```

packages/babel-plugin-transform-react-jsx-self/package.json

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+{
+  "name": "babel-plugin-transform-react-jsx-self",
+  "version": "6.9.0",
+  "description": "Add a __self prop to all JSX Elements",
+  "repository": "https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-react-jsx-self",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ],
+  "dependencies": {
+    "babel-runtime": "^6.9.0",
+    "babel-plugin-syntax-jsx": "^6.8.0"
+  },
+  "devDependencies": {
+    "babel-helper-plugin-test-runner": "^6.8.0"
+  }
+}

packages/babel-plugin-transform-react-jsx-self/src/index.js

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+
+ /**
+ * This adds {fileName, lineNumber} annotations to React component definitions
+ * and to jsx tag literals.
+ *
+ *
+ * == JSX Literals ==
+ *
+ * <sometag />
+ *
+ * becomes:
+ *
+ * <sometag __self={this} />
+ */
+
+const TRACE_ID = "__self";
+
+export default function ({ types: t }) {
+  let visitor = {
+    JSXOpeningElement(node) {
+      const id = t.jSXIdentifier(TRACE_ID);
+      const trace = t.identifier("this");
+      node.container.openingElement.attributes.push(t.jSXAttribute(id, t.jSXExpressionContainer(trace)));
+    }
+  };
+
+  return {
+    visitor
+  };
+}

packages/babel-plugin-transform-react-jsx-self/test/fixtures/react-source/basic-sample/actual.js

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+var x = <sometag />

packages/babel-plugin-transform-react-jsx-self/test/fixtures/react-source/basic-sample/expected.js

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+var x = <sometag __self={this} />;

packages/babel-plugin-transform-react-jsx-self/test/fixtures/react-source/options.json

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+{
+  "plugins": ["syntax-jsx", "transform-react-jsx-self"]
+}

packages/babel-plugin-transform-react-jsx-self/test/index.js

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+require("babel-helper-plugin-test-runner")(__dirname);