move some babel-plugins into the main repo

packages/babel-plugin-eval/.npmignore

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+node_modules
+*.log
+src

packages/babel-plugin-eval/README.md

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+# babel-plugin-eval
+
+Compile eval calls with string literals
+
+## Example
+
+**In**
+
+```javascript
+eval("(() => 'foo')");
+```
+
+**Out**
+
+```javascript
+eval("(function () { return 'foo'; })");
+```
+
+## Installation
+
+```sh
+$ npm install babel-plugin-eval
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["eval"]
+}
+```
+
+### Via CLI
+
+```sh
+$ babel --plugins eval script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["eval"]
+});
+```

packages/babel-plugin-eval/package.json

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+{
+  "name": "babel-plugin-eval",
+  "version": "1.0.1",
+  "description": "Compile eval calls with string literals",
+  "repository": "babel-plugins/babel-plugin-eval",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "devDependencies": {
+    "babel": "^5.6.0"
+  },
+  "keywords": [
+    "babel-plugin"
+  ]
+}

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

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+export default function ({ Plugin, parse, traverse }) {
+  return new Plugin("eval", {
+    metadata: {
+      group: "builtin-pre",
+    },
+
+    visitor: {
+      CallExpression(node) {
+        if (this.get("callee").isIdentifier({ name: "eval" }) && node.arguments.length === 1) {
+          var evaluate = this.get("arguments")[0].evaluate();
+          if (!evaluate.confident) return;
+
+          var code = evaluate.value;
+          if (typeof code !== "string") return;
+
+          var ast = parse(code);
+          traverse.removeProperties(ast);
+          return ast.program;
+        }
+      }
+    }
+  });
+}