move some babel-plugins into the main repo

packages/babel-plugin-react-display-name/.npmignore

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+node_modules
+*.log
+src

packages/babel-plugin-react-display-name/README.md

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+# babel-plugin-react-display-name
+
+Add displayName to React.createClass calls
+
+## Installation
+
+```sh
+$ npm install babel-plugin-react-display-name
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["react-display-name"]
+}
+```
+
+### Via CLI
+
+```sh
+$ babel --plugins react-display-name script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["react-display-name"]
+});
+```

packages/babel-plugin-react-display-name/package.json

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+{
+  "name": "babel-plugin-react-display-name",
+  "version": "2.0.0",
+  "description": "Add displayName to React.createClass calls",
+  "repository": "babel-plugins/babel-plugin-react-display-name",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ]
+}

packages/babel-plugin-react-display-name/src/index.js

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+import path from "path";
+
+export default function ({ Plugin, types: t }) {
+  function addDisplayName(id, call) {
+    var props = call.arguments[0].properties;
+    var safe = true;
+
+    for (var i = 0; i < props.length; i++) {
+      var prop = props[i];
+      var key = t.toComputedKey(prop);
+      if (t.isLiteral(key, { value: "displayName" })) {
+        safe = false;
+        break;
+      }
+    }
+
+    if (safe) {
+      props.unshift(t.property("init", t.identifier("displayName"), t.literal(id)));
+    }
+  }
+
+  var isCreateClassCallExpression = t.buildMatchMemberExpression("React.createClass");
+
+  function isCreateClass(node) {
+    if (!node || !t.isCallExpression(node)) return false;
+
+    // not React.createClass call member object
+    if (!isCreateClassCallExpression(node.callee)) return false;
+
+    // no call arguments
+    var args = node.arguments;
+    if (args.length !== 1) return false;
+
+    // first node arg is not an object
+    var first = args[0];
+    if (!t.isObjectExpression(first)) return false;
+
+    return true;
+  }
+
+  return new Plugin("react-display-name", {
+    metadata: {
+      group: "builtin-pre"
+    },
+
+    visitor: {
+      ExportDefaultDeclaration(node, parent, scope, file) {
+        if (isCreateClass(node.declaration)) {
+          var displayName = file.opts.basename;
+
+          // ./{module name}/index.js
+          if (displayName === "index") {
+            displayName = path.basename(path.dirname(file.opts.filename));
+          }
+
+          addDisplayName(displayName, node.declaration);
+        }
+      },
+
+      "AssignmentExpression|Property|VariableDeclarator"(node) {
+        var left, right;
+
+        if (t.isAssignmentExpression(node)) {
+          left = node.left;
+          right = node.right;
+        } else if (t.isProperty(node)) {
+          left = node.key;
+          right = node.value;
+        } else if (t.isVariableDeclarator(node)) {
+          left = node.id;
+          right = node.init;
+        }
+
+        if (t.isMemberExpression(left)) {
+          left = left.property;
+        }
+
+        if (t.isIdentifier(left) && isCreateClass(right)) {
+          addDisplayName(left.name, right);
+        }
+      }
+    }
+  });
+}