move some babel-plugins into the main repo

packages/babel-plugin-inline-environment-variables/.npmignore

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+node_modules
+*.log
+src

packages/babel-plugin-inline-environment-variables/README.md

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+# babel-plugin-inline-environment-variables
+
+Inline environment variables
+
+## Installation
+
+```sh
+$ npm install babel-plugin-inline-environment-variables
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["inline-environment-variables"]
+}
+```
+
+### Via CLI
+
+```sh
+$ babel --plugins inline-environment-variables script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["inline-environment-variables"]
+});
+```

packages/babel-plugin-inline-environment-variables/package.json

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+{
+  "name": "babel-plugin-inline-environment-variables",
+  "version": "1.0.1",
+  "description": "Inline environment variables",
+  "repository": "babel-plugins/babel-plugin-inline-environment-variables",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ]
+}

packages/babel-plugin-inline-environment-variables/src/index.js

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+export default function ({ Plugin, types: t }) {
+  return new Plugin("inline-environment-variables", {
+    metadata: {
+      group: "builtin-pre"
+    },
+    
+    visitor: {
+      MemberExpression(node) {
+        if (this.get("object").matchesPattern("process.env")) {
+          var key = this.toComputedKey();
+          if (t.isLiteral(key)) {
+            return t.valueToNode(process.env[key.value]);
+          }
+        }
+      }
+    }
+  });
+}