diff --git a/packages/babel-plugin-constant-folding/.npmignore b/packages/babel-plugin-constant-folding/.npmignore
new file mode 100644
index 0000000000..cace0d6ddc
--- /dev/null
+++ b/packages/babel-plugin-constant-folding/.npmignore
@@ -0,0 +1,3 @@
+node_modules
+*.log
+src
diff --git a/packages/babel-plugin-constant-folding/README.md b/packages/babel-plugin-constant-folding/README.md
new file mode 100644
index 0000000000..ea3628c133
--- /dev/null
+++ b/packages/babel-plugin-constant-folding/README.md
@@ -0,0 +1,35 @@
+# babel-plugin-constant-folding
+
+Compile static constants (ie. code that we can statically determine to be constant at runtime)
+
+## Installation
+
+```sh
+$ npm install babel-plugin-constant-folding
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["constant-folding"]
+}
+```
+
+### Via CLI
+
+```sh
+$ babel --plugins constant-folding script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["constant-folding"]
+});
+```
diff --git a/packages/babel-plugin-constant-folding/package.json b/packages/babel-plugin-constant-folding/package.json
new file mode 100644
index 0000000000..e08254ff9e
--- /dev/null
+++ b/packages/babel-plugin-constant-folding/package.json
@@ -0,0 +1,19 @@
+{
+  "name": "babel-plugin-constant-folding",
+  "version": "1.0.1",
+  "description": "Compile static constants (ie. code that we can statically determine to be constant at runtime)",
+  "repository": "babel-plugins/babel-plugin-constant-folding",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "devDependencies": {
+    "babel": "^5.6.0"
+  },
+  "scripts": {
+    "build": "babel-plugin build",
+    "push": "babel-plugin publish",
+    "test": "babel-plugin test"
+  },
+  "keywords": [
+    "babel-plugin"
+  ]
+}
diff --git a/packages/babel-plugin-constant-folding/src/index.js b/packages/babel-plugin-constant-folding/src/index.js
new file mode 100644
index 0000000000..e610b8a7a5
--- /dev/null
+++ b/packages/babel-plugin-constant-folding/src/index.js
@@ -0,0 +1,74 @@
+export default function ({ Plugin, types: t }) {
+  return new Plugin("constant-folding", {
+    metadata: {
+      group: "builtin-prepass",
+      experimental: true
+    },
+    
+    visitor: {
+      AssignmentExpression() {
+        var left = this.get("left");
+        if (!left.isIdentifier()) return;
+
+        var binding = this.scope.getBinding(left.node.name);
+        if (!binding || binding.hasDeoptValue) return;
+
+        var evaluated = this.get("right").evaluate();
+        if (evaluated.confident) {
+          binding.setValue(evaluated.value);
+        } else {
+          binding.deoptValue();
+        }
+      },
+
+      IfStatement() {
+        var evaluated = this.get("test").evaluate();
+        if (!evaluated.confident) {
+          // todo: deopt binding values for constant violations inside
+          return this.skip();
+        }
+
+        if (evaluated.value) {
+          this.skipKey("alternate");
+        } else {
+          this.skipKey("consequent");
+        }
+      },
+
+      Scopable: {
+        enter() {
+          var funcScope = this.scope.getFunctionParent();
+
+          for (var name in this.scope.bindings) {
+            var binding = this.scope.bindings[name];
+            var deopt = false;
+
+            for (var path of (binding.constantViolations: Array)) {
+              var funcViolationScope = path.scope.getFunctionParent();
+              if (funcViolationScope !== funcScope) {
+                deopt = true;
+                break;
+              }
+            }
+
+            if (deopt) binding.deoptValue();
+          }
+        },
+
+        exit() {
+          for (var name in this.scope.bindings) {
+            var binding = this.scope.bindings[name];
+            binding.clearValue();
+          }
+        }
+      },
+
+      Expression: {
+        exit() {
+          var res = this.evaluate();
+          if (res.confident) return t.valueToNode(res.value);
+        }
+      }
+    }
+  });
+}
diff --git a/packages/babel-plugin-dead-code-elimination/.npmignore b/packages/babel-plugin-dead-code-elimination/.npmignore
new file mode 100644
index 0000000000..cace0d6ddc
--- /dev/null
+++ b/packages/babel-plugin-dead-code-elimination/.npmignore
@@ -0,0 +1,3 @@
+node_modules
+*.log
+src
diff --git a/packages/babel-plugin-dead-code-elimination/README.md b/packages/babel-plugin-dead-code-elimination/README.md
new file mode 100644
index 0000000000..af182e81e8
--- /dev/null
+++ b/packages/babel-plugin-dead-code-elimination/README.md
@@ -0,0 +1,35 @@
+# babel-plugin-dead-code-elimination
+
+Eliminate dead code
+
+## Installation
+
+```sh
+$ npm install babel-plugin-dead-code-elimination
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["dead-code-elimination"]
+}
+```
+
+### Via CLI
+
+```sh
+$ babel --plugins dead-code-elimination script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["dead-code-elimination"]
+});
+```
diff --git a/packages/babel-plugin-dead-code-elimination/package.json b/packages/babel-plugin-dead-code-elimination/package.json
new file mode 100644
index 0000000000..dd728a7545
--- /dev/null
+++ b/packages/babel-plugin-dead-code-elimination/package.json
@@ -0,0 +1,19 @@
+{
+  "name": "babel-plugin-dead-code-elimination",
+  "version": "1.0.2",
+  "description": "Eliminate dead code",
+  "repository": "babel-plugins/babel-plugin-dead-code-elimination",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "devDependencies": {
+    "babel": "^5.6.0"
+  },
+  "scripts": {
+    "build": "babel-plugin build",
+    "push": "babel-plugin publish",
+    "test": "babel-plugin test"
+  },
+  "keywords": [
+    "babel-plugin"
+  ]
+}
diff --git a/packages/babel-plugin-dead-code-elimination/src/index.js b/packages/babel-plugin-dead-code-elimination/src/index.js
new file mode 100644
index 0000000000..c869422e75
--- /dev/null
+++ b/packages/babel-plugin-dead-code-elimination/src/index.js
@@ -0,0 +1,157 @@
+export default function ({ Plugin, types: t }) {
+  function toStatements(node) {
+    if (t.isBlockStatement(node)) {
+      var hasBlockScoped = false;
+
+      for (var i = 0; i < node.body.length; i++) {
+        var bodyNode = node.body[i];
+        if (t.isBlockScoped(bodyNode)) hasBlockScoped = true;
+      }
+
+      if (!hasBlockScoped) {
+        return node.body;
+      }
+    }
+
+    return node;
+  }
+
+  var visitor = {
+    ReferencedIdentifier(node, parent, scope) {
+      var binding = scope.getBinding(node.name);
+      if (!binding || binding.references > 1 || !binding.constant) return;
+      if (binding.kind === "param" || binding.kind === "module") return;
+
+      var replacement = binding.path.node;
+      if (t.isVariableDeclarator(replacement)) {
+        replacement = replacement.init;
+      }
+      if (!replacement) return;
+
+      // ensure it's a "pure" type
+      if (!scope.isPure(replacement, true)) return;
+
+      if (t.isClass(replacement) || t.isFunction(replacement)) {
+        // don't change this if it's in a different scope, this can be bad
+        // for performance since it may be inside a loop or deeply nested in
+        // hot code
+        if (binding.path.scope.parent !== scope) return;
+      }
+
+      if (this.findParent((path) => path.node === replacement)) {
+        return;
+      }
+
+      t.toExpression(replacement);
+      scope.removeBinding(node.name);
+      binding.path.dangerouslyRemove();
+      return replacement;
+    },
+
+    "ClassDeclaration|FunctionDeclaration"(node, parent, scope) {
+      var binding = scope.getBinding(node.id.name);
+      if (binding && !binding.referenced) {
+        this.dangerouslyRemove();
+      }
+    },
+
+    VariableDeclarator(node, parent, scope) {
+      if (!t.isIdentifier(node.id) || !scope.isPure(node.init, true)) return;
+      visitor["ClassDeclaration|FunctionDeclaration"].apply(this, arguments);
+    },
+
+    ConditionalExpression(node) {
+      var evaluateTest = this.get("test").evaluateTruthy();
+      if (evaluateTest === true) {
+        return node.consequent;
+      } else if (evaluateTest === false) {
+        return node.alternate;
+      }
+    },
+
+    BlockStatement() {
+      var paths = this.get("body");
+
+      var purge = false;
+
+      for (var i = 0; i < paths.length; i++) {
+        let path = paths[i];
+
+        if (!purge && path.isCompletionStatement()) {
+          purge = true;
+          continue;
+        }
+
+        if (purge && !path.isFunctionDeclaration()) {
+          path.dangerouslyRemove();
+        }
+      }
+    },
+
+    IfStatement: {
+      exit(node) {
+        var consequent = node.consequent;
+        var alternate  = node.alternate;
+        var test = node.test;
+
+        var evaluateTest = this.get("test").evaluateTruthy();
+
+        // we can check if a test will be truthy 100% and if so then we can inline
+        // the consequent and completely ignore the alternate
+        //
+        //   if (true) { foo; } -> { foo; }
+        //   if ("foo") { foo; } -> { foo; }
+        //
+
+        if (evaluateTest === true) {
+          return toStatements(consequent);
+        }
+
+        // we can check if a test will be falsy 100% and if so we can inline the
+        // alternate if there is one and completely remove the consequent
+        //
+        //   if ("") { bar; } else { foo; } -> { foo; }
+        //   if ("") { bar; } ->
+        //
+
+        if (evaluateTest === false) {
+          if (alternate) {
+            return toStatements(alternate);
+          } else {
+            return this.dangerouslyRemove();
+          }
+        }
+
+        // remove alternate blocks that are empty
+        //
+        //   if (foo) { foo; } else {} -> if (foo) { foo; }
+        //
+
+        if (t.isBlockStatement(alternate) && !alternate.body.length) {
+          alternate = node.alternate = null;
+        }
+
+        // if the consequent block is empty turn alternate blocks into a consequent
+        // and flip the test
+        //
+        //   if (foo) {} else { bar; } -> if (!foo) { bar; }
+        //
+
+        if (t.isBlockStatement(consequent) && !consequent.body.length && t.isBlockStatement(alternate) && alternate.body.length) {
+          node.consequent = node.alternate;
+          node.alternate  = null;
+          node.test       = t.unaryExpression("!", test, true);
+        }
+      }
+    }
+  };
+
+  return new Plugin("dead-code-elimination", {
+    metadata: {
+      group: "builtin-pre",
+      experimental: true
+    },
+
+    visitor
+  });
+}
diff --git a/packages/babel-plugin-eval/.npmignore b/packages/babel-plugin-eval/.npmignore
new file mode 100644
index 0000000000..cace0d6ddc
--- /dev/null
+++ b/packages/babel-plugin-eval/.npmignore
@@ -0,0 +1,3 @@
+node_modules
+*.log
+src
diff --git a/packages/babel-plugin-eval/README.md b/packages/babel-plugin-eval/README.md
new file mode 100644
index 0000000000..cae0be25d5
--- /dev/null
+++ b/packages/babel-plugin-eval/README.md
@@ -0,0 +1,49 @@
+# 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"]
+});
+```
diff --git a/packages/babel-plugin-eval/package.json b/packages/babel-plugin-eval/package.json
new file mode 100644
index 0000000000..5eaddfdb57
--- /dev/null
+++ b/packages/babel-plugin-eval/package.json
@@ -0,0 +1,14 @@
+{
+  "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"
+  ]
+}
diff --git a/packages/babel-plugin-eval/src/index.js b/packages/babel-plugin-eval/src/index.js
new file mode 100644
index 0000000000..0066fd3d25
--- /dev/null
+++ b/packages/babel-plugin-eval/src/index.js
@@ -0,0 +1,23 @@
+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;
+        }
+      }
+    }
+  });
+}
diff --git a/packages/babel-plugin-inline-environment-variables/.npmignore b/packages/babel-plugin-inline-environment-variables/.npmignore
new file mode 100644
index 0000000000..cace0d6ddc
--- /dev/null
+++ b/packages/babel-plugin-inline-environment-variables/.npmignore
@@ -0,0 +1,3 @@
+node_modules
+*.log
+src
diff --git a/packages/babel-plugin-inline-environment-variables/README.md b/packages/babel-plugin-inline-environment-variables/README.md
new file mode 100644
index 0000000000..8e4a154852
--- /dev/null
+++ b/packages/babel-plugin-inline-environment-variables/README.md
@@ -0,0 +1,35 @@
+# 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"]
+});
+```
diff --git a/packages/babel-plugin-inline-environment-variables/package.json b/packages/babel-plugin-inline-environment-variables/package.json
new file mode 100644
index 0000000000..8691170cac
--- /dev/null
+++ b/packages/babel-plugin-inline-environment-variables/package.json
@@ -0,0 +1,11 @@
+{
+  "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"
+  ]
+}
diff --git a/packages/babel-plugin-inline-environment-variables/src/index.js b/packages/babel-plugin-inline-environment-variables/src/index.js
new file mode 100644
index 0000000000..7425774dfb
--- /dev/null
+++ b/packages/babel-plugin-inline-environment-variables/src/index.js
@@ -0,0 +1,18 @@
+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]);
+          }
+        }
+      }
+    }
+  });
+}
diff --git a/packages/babel-plugin-jscript/.npmignore b/packages/babel-plugin-jscript/.npmignore
new file mode 100644
index 0000000000..cace0d6ddc
--- /dev/null
+++ b/packages/babel-plugin-jscript/.npmignore
@@ -0,0 +1,3 @@
+node_modules
+*.log
+src
diff --git a/packages/babel-plugin-jscript/README.md b/packages/babel-plugin-jscript/README.md
new file mode 100644
index 0000000000..7c508422eb
--- /dev/null
+++ b/packages/babel-plugin-jscript/README.md
@@ -0,0 +1,35 @@
+# 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"]
+});
+```
diff --git a/packages/babel-plugin-jscript/package.json b/packages/babel-plugin-jscript/package.json
new file mode 100644
index 0000000000..dbbe3846f0
--- /dev/null
+++ b/packages/babel-plugin-jscript/package.json
@@ -0,0 +1,11 @@
+{
+  "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"
+  ]
+}
diff --git a/packages/babel-plugin-jscript/src/index.js b/packages/babel-plugin-jscript/src/index.js
new file mode 100644
index 0000000000..4f7462a931
--- /dev/null
+++ b/packages/babel-plugin-jscript/src/index.js
@@ -0,0 +1,24 @@
+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)
+            ])),
+            []
+          );
+        }
+      }
+    }
+  });
+}
diff --git a/packages/babel-plugin-member-expression-literals/.npmignore b/packages/babel-plugin-member-expression-literals/.npmignore
new file mode 100644
index 0000000000..cace0d6ddc
--- /dev/null
+++ b/packages/babel-plugin-member-expression-literals/.npmignore
@@ -0,0 +1,3 @@
+node_modules
+*.log
+src
diff --git a/packages/babel-plugin-member-expression-literals/README.md b/packages/babel-plugin-member-expression-literals/README.md
new file mode 100644
index 0000000000..0785c2549f
--- /dev/null
+++ b/packages/babel-plugin-member-expression-literals/README.md
@@ -0,0 +1,55 @@
+# babel-plugin-member-expression-literals
+
+Turn valid member expression property literals into plain identifiers
+
+## Example
+
+**In**
+
+```javascript
+obj["foo"] = "isValid";
+
+obj.const = "isKeyword";
+obj["var"] = "isKeyword";
+```
+
+**Out**
+
+```javascript
+obj.foo = "isValid";
+
+obj["const"] = "isKeyword";
+obj["var"] = "isKeyword";
+```
+
+## Installation
+
+```sh
+$ npm install babel-plugin-member-expression-literals
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["member-expression-literals"]
+}
+```
+
+### Via CLI
+
+```sh
+$ babel --plugins member-expression-literals script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["member-expression-literals"]
+});
+```
diff --git a/packages/babel-plugin-member-expression-literals/package.json b/packages/babel-plugin-member-expression-literals/package.json
new file mode 100644
index 0000000000..e2338904d2
--- /dev/null
+++ b/packages/babel-plugin-member-expression-literals/package.json
@@ -0,0 +1,11 @@
+{
+  "name": "babel-plugin-member-expression-literals",
+  "version": "1.0.1",
+  "description": "Turn valid member expression property literals into plain identifiers",
+  "repository": "babel-plugins/babel-plugin-member-expression-literals",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ]
+}
diff --git a/packages/babel-plugin-member-expression-literals/src/index.js b/packages/babel-plugin-member-expression-literals/src/index.js
new file mode 100644
index 0000000000..547dbe2c5d
--- /dev/null
+++ b/packages/babel-plugin-member-expression-literals/src/index.js
@@ -0,0 +1,20 @@
+export default function ({ Plugin, types: t }) {
+  return new Plugin("member-expression-literals", {
+    metadata: {
+      group: "builtin-trailing"
+    },
+    
+    visitor: {
+      MemberExpression: {
+        exit(node) {
+          var prop = node.property;
+          if (node.computed && t.isLiteral(prop) && t.isValidIdentifier(prop.value)) {
+            // foo["bar"] => foo.bar
+            node.property = t.identifier(prop.value);
+            node.computed = false;
+          }
+        }
+      }
+    }
+  });
+}
diff --git a/packages/babel-plugin-property-literals/.npmignore b/packages/babel-plugin-property-literals/.npmignore
new file mode 100644
index 0000000000..cace0d6ddc
--- /dev/null
+++ b/packages/babel-plugin-property-literals/.npmignore
@@ -0,0 +1,3 @@
+node_modules
+*.log
+src
diff --git a/packages/babel-plugin-property-literals/README.md b/packages/babel-plugin-property-literals/README.md
new file mode 100644
index 0000000000..ed282d96c6
--- /dev/null
+++ b/packages/babel-plugin-property-literals/README.md
@@ -0,0 +1,57 @@
+# babel-plugin-property-literals
+
+Turn valid property key literals to plain identifiers
+
+## Example
+
+**In**
+
+```javascript
+var obj = {
+  "foo": "isValid",
+  var: "isKeyword",
+  "const": "isKeyword"
+};
+```
+
+**Out**
+
+```javascript
+var obj = {
+  foo: "isValid",
+  "var": "isKeyword",
+  "const": "isKeyword"
+};
+```
+
+## Installation
+
+```sh
+$ npm install babel-plugin-property-literals
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["property-literals"]
+}
+```
+
+### Via CLI
+
+```sh
+$ babel --plugins property-literals script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["property-literals"]
+});
+```
diff --git a/packages/babel-plugin-property-literals/package.json b/packages/babel-plugin-property-literals/package.json
new file mode 100644
index 0000000000..22fb554ce6
--- /dev/null
+++ b/packages/babel-plugin-property-literals/package.json
@@ -0,0 +1,11 @@
+{
+  "name": "babel-plugin-property-literals",
+  "version": "1.0.1",
+  "description": "Turn valid property key literals to plain identifiers",
+  "repository": "babel-plugins/babel-plugin-property-literals",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ]
+}
diff --git a/packages/babel-plugin-property-literals/src/index.js b/packages/babel-plugin-property-literals/src/index.js
new file mode 100644
index 0000000000..b6c9b9520e
--- /dev/null
+++ b/packages/babel-plugin-property-literals/src/index.js
@@ -0,0 +1,20 @@
+export default function ({ Plugin, types: t }) {
+  return new Plugin("property-literals", {
+    metadata: {
+      group: "builtin-trailing"
+    },
+    
+    visitor: {
+      Property: {
+        exit(node) {
+          var key = node.key;
+          if (t.isLiteral(key) && t.isValidIdentifier(key.value)) {
+            // "foo": "bar" -> foo: "bar"
+            node.key = t.identifier(key.value);
+            node.computed = false;
+          }
+        }
+      }
+    }
+  });
+}
diff --git a/packages/babel-plugin-proto-to-assign/.npmignore b/packages/babel-plugin-proto-to-assign/.npmignore
new file mode 100644
index 0000000000..cace0d6ddc
--- /dev/null
+++ b/packages/babel-plugin-proto-to-assign/.npmignore
@@ -0,0 +1,3 @@
+node_modules
+*.log
+src
diff --git a/packages/babel-plugin-proto-to-assign/README.md b/packages/babel-plugin-proto-to-assign/README.md
new file mode 100644
index 0000000000..cb06ec7428
--- /dev/null
+++ b/packages/babel-plugin-proto-to-assign/README.md
@@ -0,0 +1,75 @@
+# babel-plugin-proto-to-assign
+
+The `proto-to-assign`plugin will transform all `__proto__` assignments to a method that will do a shallow copy of
+all properties.
+
+This means that the following **will** work:
+
+```javascript
+var foo = { a: 1 };
+var bar = { b: 2 };
+bar.__proto__ = foo;
+bar.a; // 1
+bar.b; // 2
+```
+
+however the following **will not**:
+
+```javascript
+var foo = { a: 1 };
+var bar = { b: 2 };
+bar.__proto__ = foo;
+bar.a; // 1
+foo.a = 2;
+bar.a; // 1 - should be 2 but remember that nothing is bound and it's a straight copy
+```
+
+This is a case that you have to be aware of if you intend to use this plugin.
+
+## Example
+
+**In**
+
+```javascript
+bar.__proto__ = foo;
+```
+
+**Out**
+
+```javascript
+var _defaults = ...;
+
+_defaults(bar, foo);
+```
+
+## Installation
+
+```sh
+$ npm install babel-plugin-proto-to-assign
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["proto-to-assign"]
+}
+```
+
+### Via CLI
+
+```sh
+$ babel --plugins proto-to-assign script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["proto-to-assign"]
+});
+```
diff --git a/packages/babel-plugin-proto-to-assign/package.json b/packages/babel-plugin-proto-to-assign/package.json
new file mode 100644
index 0000000000..038f7b7c91
--- /dev/null
+++ b/packages/babel-plugin-proto-to-assign/package.json
@@ -0,0 +1,14 @@
+{
+  "name": "babel-plugin-proto-to-assign",
+  "version": "1.0.4",
+  "description": "Babel plugin for turning __proto__ into a shallow property clone",
+  "repository": "babel-plugins/babel-plugin-proto-to-assign",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ],
+  "dependencies": {
+    "lodash": "^3.9.3"
+  }
+}
diff --git a/packages/babel-plugin-proto-to-assign/src/index.js b/packages/babel-plugin-proto-to-assign/src/index.js
new file mode 100644
index 0000000000..e172b71892
--- /dev/null
+++ b/packages/babel-plugin-proto-to-assign/src/index.js
@@ -0,0 +1,66 @@
+import pull from "lodash/array/pull";
+
+export default function ({ Plugin, types: t }) {
+  function isProtoKey(node) {
+    return t.isLiteral(t.toComputedKey(node, node.key), { value: "__proto__" });
+  }
+
+  function isProtoAssignmentExpression(node) {
+    var left = node.left;
+    return t.isMemberExpression(left) && t.isLiteral(t.toComputedKey(left, left.property), { value: "__proto__" });
+  }
+
+  function buildDefaultsCallExpression(expr, ref, file) {
+    return t.expressionStatement(t.callExpression(file.addHelper("defaults"), [ref, expr.right]));
+  }
+
+  return new Plugin("proto-to-assign", {
+    metadata: {
+      secondPass: true
+    },
+
+    visitor: {
+      AssignmentExpression(node, parent, scope, file) {
+        if (!isProtoAssignmentExpression(node)) return;
+
+        var nodes = [];
+        var left  = node.left.object;
+        var temp  = scope.maybeGenerateMemoised(left);
+
+        if (temp) nodes.push(t.expressionStatement(t.assignmentExpression("=", temp, left)));
+        nodes.push(buildDefaultsCallExpression(node, temp || left, file));
+        if (temp) nodes.push(temp);
+
+        return nodes;
+      },
+
+      ExpressionStatement(node, parent, scope, file) {
+        var expr = node.expression;
+        if (!t.isAssignmentExpression(expr, { operator: "=" })) return;
+
+        if (isProtoAssignmentExpression(expr)) {
+          return buildDefaultsCallExpression(expr, expr.left.object, file);
+        }
+      },
+
+      ObjectExpression(node, parent, scope, file) {
+        var proto;
+
+        for (var i = 0; i < node.properties.length; i++) {
+          var prop = node.properties[i];
+
+          if (isProtoKey(prop)) {
+            proto = prop.value;
+            pull(node.properties, prop);
+          }
+        }
+
+        if (proto) {
+          var args = [t.objectExpression([]), proto];
+          if (node.properties.length) args.push(node);
+          return t.callExpression(file.addHelper("extends"), args);
+        }
+      }
+    }
+  });
+}
diff --git a/packages/babel-plugin-react-constant-elements/.npmignore b/packages/babel-plugin-react-constant-elements/.npmignore
new file mode 100644
index 0000000000..cace0d6ddc
--- /dev/null
+++ b/packages/babel-plugin-react-constant-elements/.npmignore
@@ -0,0 +1,3 @@
+node_modules
+*.log
+src
diff --git a/packages/babel-plugin-react-constant-elements/README.md b/packages/babel-plugin-react-constant-elements/README.md
new file mode 100644
index 0000000000..fddaabd60f
--- /dev/null
+++ b/packages/babel-plugin-react-constant-elements/README.md
@@ -0,0 +1,35 @@
+# babel-plugin-react-constant-elements
+
+Treat React JSX elements as value types and hoist them to the highest scope
+
+## Installation
+
+```sh
+$ npm install babel-plugin-react-constant-elements
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["react-constant-elements"]
+}
+```
+
+### Via CLI
+
+```sh
+$ babel --plugins react-constant-elements script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["react-constant-elements"]
+});
+```
diff --git a/packages/babel-plugin-react-constant-elements/package.json b/packages/babel-plugin-react-constant-elements/package.json
new file mode 100644
index 0000000000..ab31ef069d
--- /dev/null
+++ b/packages/babel-plugin-react-constant-elements/package.json
@@ -0,0 +1,11 @@
+{
+  "name": "babel-plugin-react-constant-elements",
+  "version": "1.0.3",
+  "description": "Treat React JSX elements as value types and hoist them to the highest scope",
+  "repository": "babel-plugins/babel-plugin-react-constant-elements",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ]
+}
diff --git a/packages/babel-plugin-react-constant-elements/src/index.js b/packages/babel-plugin-react-constant-elements/src/index.js
new file mode 100644
index 0000000000..f5dce29f65
--- /dev/null
+++ b/packages/babel-plugin-react-constant-elements/src/index.js
@@ -0,0 +1,46 @@
+export default function ({ Plugin }) {
+  var immutabilityVisitor = {
+    enter(node, parent, scope, state) {
+      var stop = () => {
+        state.isImmutable = false;
+        this.stop();
+      };
+
+      if (this.isJSXClosingElement()) {
+        this.skip();
+        return;
+      }
+
+      if (this.isJSXIdentifier({ name: "ref" }) && this.parentPath.isJSXAttribute({ name: node })) {
+        return stop();
+      }
+
+      if (this.isJSXIdentifier() || this.isIdentifier() || this.isJSXMemberExpression()) {
+        return;
+      }
+
+      if (!this.isImmutable()) stop();
+    }
+  };
+
+  return new Plugin("react-constant-elements", {
+    metadata: {
+      group: "builtin-basic"
+    },
+
+    visitor: {
+      JSXElement(node) {
+        if (node._hoisted) return;
+
+        var state = { isImmutable: true };
+        this.traverse(immutabilityVisitor, state);
+
+        if (state.isImmutable) {
+          this.hoist();
+        } else {
+          node._hoisted = true;
+        }
+      }
+    }
+  });
+}
diff --git a/packages/babel-plugin-react-display-name/.npmignore b/packages/babel-plugin-react-display-name/.npmignore
new file mode 100644
index 0000000000..cace0d6ddc
--- /dev/null
+++ b/packages/babel-plugin-react-display-name/.npmignore
@@ -0,0 +1,3 @@
+node_modules
+*.log
+src
diff --git a/packages/babel-plugin-react-display-name/README.md b/packages/babel-plugin-react-display-name/README.md
new file mode 100644
index 0000000000..56fc028159
--- /dev/null
+++ b/packages/babel-plugin-react-display-name/README.md
@@ -0,0 +1,35 @@
+# 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"]
+});
+```
diff --git a/packages/babel-plugin-react-display-name/package.json b/packages/babel-plugin-react-display-name/package.json
new file mode 100644
index 0000000000..9909916661
--- /dev/null
+++ b/packages/babel-plugin-react-display-name/package.json
@@ -0,0 +1,11 @@
+{
+  "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"
+  ]
+}
diff --git a/packages/babel-plugin-react-display-name/src/index.js b/packages/babel-plugin-react-display-name/src/index.js
new file mode 100644
index 0000000000..bc85364538
--- /dev/null
+++ b/packages/babel-plugin-react-display-name/src/index.js
@@ -0,0 +1,84 @@
+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);
+        }
+      }
+    }
+  });
+}
diff --git a/packages/babel-plugin-remove-console/.npmignore b/packages/babel-plugin-remove-console/.npmignore
new file mode 100644
index 0000000000..cace0d6ddc
--- /dev/null
+++ b/packages/babel-plugin-remove-console/.npmignore
@@ -0,0 +1,3 @@
+node_modules
+*.log
+src
diff --git a/packages/babel-plugin-remove-console/README.md b/packages/babel-plugin-remove-console/README.md
new file mode 100644
index 0000000000..5518aa1532
--- /dev/null
+++ b/packages/babel-plugin-remove-console/README.md
@@ -0,0 +1,35 @@
+# babel-plugin-remove-console
+
+Remove console.* calls
+
+## Installation
+
+```sh
+$ npm install babel-plugin-remove-console
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["remove-console"]
+}
+```
+
+### Via CLI
+
+```sh
+$ babel --plugins remove-console script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["remove-console"]
+});
+```
diff --git a/packages/babel-plugin-remove-console/package.json b/packages/babel-plugin-remove-console/package.json
new file mode 100644
index 0000000000..6e8a11388f
--- /dev/null
+++ b/packages/babel-plugin-remove-console/package.json
@@ -0,0 +1,11 @@
+{
+  "name": "babel-plugin-remove-console",
+  "version": "1.0.1",
+  "description": "Remove console.* calls",
+  "repository": "babel-plugins/babel-plugin-remove-console",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ]
+}
diff --git a/packages/babel-plugin-remove-console/src/index.js b/packages/babel-plugin-remove-console/src/index.js
new file mode 100644
index 0000000000..ca73d14794
--- /dev/null
+++ b/packages/babel-plugin-remove-console/src/index.js
@@ -0,0 +1,15 @@
+export default function ({ Plugin, types: t }) {
+  return new Plugin("remove-console", {
+    metadata: {
+      group: "builtin-pre"
+    },
+
+    visitor: {
+      CallExpression() {
+        if (this.get("callee").matchesPattern("console", true)) {
+          this.dangerouslyRemove();
+        }
+      }
+    }
+  });
+}
diff --git a/packages/babel-plugin-remove-debugger/.npmignore b/packages/babel-plugin-remove-debugger/.npmignore
new file mode 100644
index 0000000000..cace0d6ddc
--- /dev/null
+++ b/packages/babel-plugin-remove-debugger/.npmignore
@@ -0,0 +1,3 @@
+node_modules
+*.log
+src
diff --git a/packages/babel-plugin-remove-debugger/README.md b/packages/babel-plugin-remove-debugger/README.md
new file mode 100644
index 0000000000..295dcf659c
--- /dev/null
+++ b/packages/babel-plugin-remove-debugger/README.md
@@ -0,0 +1,35 @@
+# babel-plugin-remove-debugger
+
+Remove debugger statements
+
+## Installation
+
+```sh
+$ npm install babel-plugin-remove-debugger
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["remove-debugger"]
+}
+```
+
+### Via CLI
+
+```sh
+$ babel --plugins remove-debugger script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["remove-debugger"]
+});
+```
diff --git a/packages/babel-plugin-remove-debugger/package.json b/packages/babel-plugin-remove-debugger/package.json
new file mode 100644
index 0000000000..ff05e23346
--- /dev/null
+++ b/packages/babel-plugin-remove-debugger/package.json
@@ -0,0 +1,11 @@
+{
+  "name": "babel-plugin-remove-debugger",
+  "version": "1.0.1",
+  "description": "Remove debugger statements",
+  "repository": "babel-plugins/babel-plugin-remove-debugger",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ]
+}
diff --git a/packages/babel-plugin-remove-debugger/src/index.js b/packages/babel-plugin-remove-debugger/src/index.js
new file mode 100644
index 0000000000..62f6ca194c
--- /dev/null
+++ b/packages/babel-plugin-remove-debugger/src/index.js
@@ -0,0 +1,13 @@
+export default function ({ Plugin, types: t }) {
+  return new Plugin("remove-debugger", {
+    metadata: {
+      group: "builtin-pre"
+    },
+
+    visitor: {
+      DebuggerStatement() {
+        this.dangerouslyRemove();
+      }
+    }
+  });
+}
diff --git a/packages/babel-plugin-runtime/.npmignore b/packages/babel-plugin-runtime/.npmignore
new file mode 100644
index 0000000000..cace0d6ddc
--- /dev/null
+++ b/packages/babel-plugin-runtime/.npmignore
@@ -0,0 +1,3 @@
+node_modules
+*.log
+src
diff --git a/packages/babel-plugin-runtime/README.md b/packages/babel-plugin-runtime/README.md
new file mode 100644
index 0000000000..9abd3c2ff2
--- /dev/null
+++ b/packages/babel-plugin-runtime/README.md
@@ -0,0 +1,35 @@
+# babel-plugin-runtime
+
+Externalise references to helpers and builtins, automatically polyfilling your code without polluting globals
+
+## Installation
+
+```sh
+$ npm install babel-plugin-runtime
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["runtime"]
+}
+```
+
+### Via CLI
+
+```sh
+$ babel --plugins runtime script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["runtime"]
+});
+```
diff --git a/packages/babel-plugin-runtime/package.json b/packages/babel-plugin-runtime/package.json
new file mode 100644
index 0000000000..43432e30f4
--- /dev/null
+++ b/packages/babel-plugin-runtime/package.json
@@ -0,0 +1,11 @@
+{
+  "name": "babel-plugin-runtime",
+  "version": "1.0.7",
+  "description": "Externalise references to helpers and builtins, automatically polyfilling your code without polluting globals",
+  "repository": "babel-plugins/babel-plugin-runtime",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ]
+}
diff --git a/packages/babel-plugin-runtime/src/definitions.json b/packages/babel-plugin-runtime/src/definitions.json
new file mode 100644
index 0000000000..9c82814bc5
--- /dev/null
+++ b/packages/babel-plugin-runtime/src/definitions.json
@@ -0,0 +1,168 @@
+{
+  "builtins": {
+    "Symbol": "symbol",
+    "Promise": "promise",
+    "Map": "map",
+    "WeakMap": "weak-map",
+    "Set": "set",
+    "WeakSet": "weak-set"
+  },
+
+  "methods": {
+    "Array": {
+      "concat": "array/concat",
+      "copyWithin": "array/copy-within",
+      "entries": "array/entries",
+      "every": "array/every",
+      "fill": "array/fill",
+      "filter": "array/filter",
+      "findIndex": "array/find-index",
+      "find": "array/find",
+      "forEach": "array/for-each",
+      "from": "array/from",
+      "includes": "array/includes",
+      "indexOf": "array/index-of",
+      "join": "array/join",
+      "keys": "array/keys",
+      "lastIndexOf": "array/last-index-of",
+      "map": "array/map",
+      "of": "array/of",
+      "pop": "array/pop",
+      "push": "array/push",
+      "reduceRight": "array/reduce-right",
+      "reduce": "array/reduce",
+      "reverse": "array/reverse",
+      "shift": "array/shift",
+      "slice": "array/slice",
+      "some": "array/some",
+      "sort": "array/sort",
+      "splice": "array/splice",
+      "turn": "array/turn",
+      "unshift": "array/unshift",
+      "values": "array/values"
+    },
+
+    "Object": {
+      "assign": "object/assign",
+      "classof": "object/classof",
+      "create": "object/create",
+      "define": "object/define",
+      "defineProperties": "object/define-properties",
+      "defineProperty": "object/define-property",
+      "entries": "object/entries",
+      "freeze": "object/freeze",
+      "getOwnPropertyDescriptor": "object/get-own-property-descriptor",
+      "getOwnPropertyDescriptors": "object/get-own-property-descriptors",
+      "getOwnPropertyNames": "object/get-own-property-names",
+      "getOwnPropertySymbols": "object/get-own-property-symbols",
+      "getPrototypePf": "object/get-prototype-of",
+      "index": "object/index",
+      "isExtensible": "object/is-extensible",
+      "isFrozen": "object/is-frozen",
+      "isObject": "object/is-object",
+      "isSealed": "object/is-sealed",
+      "is": "object/is",
+      "keys": "object/keys",
+      "make": "object/make",
+      "preventExtensions": "object/prevent-extensions",
+      "seal": "object/seal",
+      "setPrototypeOf": "object/set-prototype-of",
+      "values": "object/values"
+    },
+
+    "RegExp": {
+      "escape": "regexp/escape"
+    },
+
+    "Function": {
+      "only": "function/only",
+      "part": "function/part"
+    },
+
+    "Math": {
+      "acosh": "math/acosh",
+      "asinh": "math/asinh",
+      "atanh": "math/atanh",
+      "cbrt": "math/cbrt",
+      "clz32": "math/clz32",
+      "cosh": "math/cosh",
+      "expm1": "math/expm1",
+      "fround": "math/fround",
+      "hypot": "math/hypot",
+      "pot": "math/pot",
+      "imul": "math/imul",
+      "log10": "math/log10",
+      "log1p": "math/log1p",
+      "log2": "math/log2",
+      "sign": "math/sign",
+      "sinh": "math/sinh",
+      "tanh": "math/tanh",
+      "trunc": "math/trunc"
+    },
+
+    "Date": {
+      "addLocale": "date/add-locale",
+      "formatUTC": "date/format-utc",
+      "format": "date/format"
+    },
+
+    "Symbol": {
+      "for": "symbol/for",
+      "hasInstance": "symbol/has-instance",
+      "is-concat-spreadable": "symbol/is-concat-spreadable",
+      "iterator": "symbol/iterator",
+      "keyFor": "symbol/key-for",
+      "match": "symbol/match",
+      "replace": "symbol/replace",
+      "search": "symbol/search",
+      "species": "symbol/species",
+      "split": "symbol/split",
+      "toPrimitive": "symbol/to-primitive",
+      "toStringTag": "symbol/to-string-tag",
+      "unscopables": "symbol/unscopables"
+    },
+
+    "String": {
+      "at": "string/at",
+      "codePointAt": "string/code-point-at",
+      "endsWith": "string/ends-with",
+      "escapeHTML": "string/escape-html",
+      "fromCodePoint": "string/from-code-point",
+      "includes": "string/includes",
+      "raw": "string/raw",
+      "repeat": "string/repeat",
+      "startsWith": "string/starts-with",
+      "unescapeHTML": "string/unescape-html"
+    },
+
+    "Number": {
+      "EPSILON": "number/epsilon",
+      "isFinite": "number/is-finite",
+      "isInteger": "number/is-integer",
+      "isNaN": "number/is-nan",
+      "isSafeInteger": "number/is-safe-integer",
+      "MAX_SAFE_INTEGER": "number/max-safe-integer",
+      "MIN_SAFE_INTEGER": "number/min-safe-integer",
+      "parseFloat": "number/parse-float",
+      "parseInt": "number/parse-int",
+      "random": "number/random"
+    },
+
+    "Reflect": {
+      "apply": "reflect/apply",
+      "construct": "reflect/construct",
+      "defineProperty": "reflect/define-property",
+      "deleteProperty": "reflect/delete-property",
+      "enumerate": "reflect/enumerate",
+      "getOwnPropertyDescriptor": "reflect/get-own-property-descriptor",
+      "getPrototypeOf": "reflect/get-prototype-of",
+      "get": "reflect/get",
+      "has": "reflect/has",
+      "isExtensible": "reflect/is-extensible",
+      "ownKeys": "reflect/own-keys",
+      "preventExtensions": "reflect/prevent-extensions",
+      "setPrototypeOf": "reflect/set-prototype-of",
+      "set": "reflect/set"
+    }
+  }
+}
diff --git a/packages/babel-plugin-runtime/src/index.js b/packages/babel-plugin-runtime/src/index.js
new file mode 100644
index 0000000000..8baba46ddb
--- /dev/null
+++ b/packages/babel-plugin-runtime/src/index.js
@@ -0,0 +1,114 @@
+import definitions from "./definitions";
+
+export default function ({ Plugin, types: t }) {
+  const RUNTIME_MODULE_NAME = "babel-runtime";
+
+  function has(obj, key) {
+    return Object.prototype.hasOwnProperty.call(obj, key);
+  }
+
+  return new Plugin("runtime", {
+    metadata: {
+      group: "builtin-post-modules"
+    },
+
+    pre(file) {
+      file.set("helperGenerator", function (name) {
+        return file.addImport(`${RUNTIME_MODULE_NAME}/helpers/${name}`, name, "absoluteDefault");
+      });
+
+      file.setDynamic("regeneratorIdentifier", function () {
+        return file.addImport(`${RUNTIME_MODULE_NAME}/regenerator`, "regeneratorRuntime", "absoluteDefault");
+      });
+    },
+
+    visitor: {
+      ReferencedIdentifier(node, parent, scope, file) {
+        if (node.name === "regeneratorRuntime") {
+          return file.get("regeneratorIdentifier");
+        }
+
+        if (t.isMemberExpression(parent)) return;
+        if (!has(definitions.builtins, node.name)) return;
+        if (scope.getBindingIdentifier(node.name)) return;
+
+        // Symbol() -> _core.Symbol(); new Promise -> new _core.Promise
+        var modulePath = definitions.builtins[node.name];
+        return file.addImport(`${RUNTIME_MODULE_NAME}/core-js/${modulePath}`, node.name, "absoluteDefault");
+      },
+
+      CallExpression(node, parent, scope, file) {
+        // arr[Symbol.iterator]() -> _core.$for.getIterator(arr)
+
+        if (node.arguments.length) return;
+
+        var callee = node.callee;
+        if (!t.isMemberExpression(callee)) return;
+        if (!callee.computed) return;
+        if (!this.get("callee.property").matchesPattern("Symbol.iterator")) return;
+
+        return t.callExpression(file.addImport(`${RUNTIME_MODULE_NAME}/core-js/get-iterator`, "getIterator", "absoluteDefault"), [callee.object]);
+      },
+
+      BinaryExpression(node, parent, scope, file) {
+        // Symbol.iterator in arr -> core.$for.isIterable(arr)
+
+        if (node.operator !== "in") return;
+        if (!this.get("left").matchesPattern("Symbol.iterator")) return;
+
+        return t.callExpression(
+          file.addImport(`${RUNTIME_MODULE_NAME}/core-js/is-iterable`, "isIterable", "absoluteDefault"),
+          [node.right]
+        );
+      },
+
+      MemberExpression: {
+        enter(node, parent, scope, file) {
+          // Array.from -> _core.Array.from
+
+          if (!this.isReferenced()) return;
+
+          var obj = node.object;
+          var prop = node.property;
+
+          if (!t.isReferenced(obj, node)) return;
+
+          if (node.computed) return;
+
+          if (!has(definitions.methods, obj.name)) return;
+
+          var methods = definitions.methods[obj.name];
+          if (!has(methods, prop.name)) return;
+
+          // doesn't reference the global
+          if (scope.getBindingIdentifier(obj.name)) return;
+
+          // special case Object.defineProperty to not use core-js when using string keys
+          if (obj.name === "Object" && prop.name === "defineProperty" && this.parentPath.isCallExpression()) {
+            var call = this.parentPath.node;
+            if (call.arguments.length === 3 && t.isLiteral(call.arguments[1])) return;
+          }
+
+          var modulePath = methods[prop.name];
+          return file.addImport(`${RUNTIME_MODULE_NAME}/core-js/${modulePath}`, `${obj.name}$${prop.name}`, "absoluteDefault");
+        },
+
+        exit(node, parent, scope, file) {
+          if (!this.isReferenced()) return;
+
+          var prop = node.property;
+          var obj  = node.object;
+
+          if (!has(definitions.builtins, obj.name)) return;
+          if (scope.getBindingIdentifier(obj.name)) return;
+
+          var modulePath = definitions.builtins[obj.name];
+          return t.memberExpression(
+            file.addImport(`${RUNTIME_MODULE_NAME}/core-js/${modulePath}`, `${obj.name}`, "absoluteDefault"),
+            prop
+          );
+        }
+      }
+    }
+  });
+}
diff --git a/packages/babel-plugin-undeclared-variables-check/.npmignore b/packages/babel-plugin-undeclared-variables-check/.npmignore
new file mode 100644
index 0000000000..cace0d6ddc
--- /dev/null
+++ b/packages/babel-plugin-undeclared-variables-check/.npmignore
@@ -0,0 +1,3 @@
+node_modules
+*.log
+src
diff --git a/packages/babel-plugin-undeclared-variables-check/README.md b/packages/babel-plugin-undeclared-variables-check/README.md
new file mode 100644
index 0000000000..8051e67a12
--- /dev/null
+++ b/packages/babel-plugin-undeclared-variables-check/README.md
@@ -0,0 +1,35 @@
+# babel-plugin-undeclared-variables-check
+
+Throw a compile-time error on references to undeclared variables
+
+## Installation
+
+```sh
+$ npm install babel-plugin-undeclared-variables-check
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["undeclared-variables-check"]
+}
+```
+
+### Via CLI
+
+```sh
+$ babel --plugins undeclared-variables-check script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["undeclared-variables-check"]
+});
+```
diff --git a/packages/babel-plugin-undeclared-variables-check/package.json b/packages/babel-plugin-undeclared-variables-check/package.json
new file mode 100644
index 0000000000..5d8fcfffee
--- /dev/null
+++ b/packages/babel-plugin-undeclared-variables-check/package.json
@@ -0,0 +1,14 @@
+{
+  "name": "babel-plugin-undeclared-variables-check",
+  "version": "1.0.2",
+  "description": "Throw a compile-time error on references to undeclared variables",
+  "repository": "babel-plugins/babel-plugin-undeclared-variables-check",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ],
+  "dependencies": {
+    "leven": "^1.0.2"
+  }
+}
diff --git a/packages/babel-plugin-undeclared-variables-check/src/index.js b/packages/babel-plugin-undeclared-variables-check/src/index.js
new file mode 100644
index 0000000000..94178baafc
--- /dev/null
+++ b/packages/babel-plugin-undeclared-variables-check/src/index.js
@@ -0,0 +1,48 @@
+import levenshtein from "leven";
+
+export default function ({ Plugin, types: t, messages }) {
+  return new Plugin("undeclared-variables-check", {
+    metadata: {
+      group: "builtin-pre"
+    },
+    
+    visitor: {
+      ReferencedIdentifier(node, parent, scope) {
+        var binding = scope.getBinding(node.name);
+        if (binding && binding.kind === "type" && !this.parentPath.isFlow()) {
+          throw this.errorWithNode(messages.get("undeclaredVariableType", node.name), ReferenceError);
+        }
+
+        if (scope.hasBinding(node.name)) return;
+
+        // get the closest declaration to offer as a suggestion
+        // the variable name may have just been mistyped
+
+        var bindings = scope.getAllBindings();
+
+        var closest;
+        var shortest = -1;
+
+        for (var name in bindings) {
+          var distance = levenshtein(node.name, name);
+          if (distance <= 0 || distance > 3) continue;
+          if (distance <= shortest) continue;
+
+          closest = name;
+          shortest = distance;
+        }
+
+        var msg;
+        if (closest) {
+          msg = messages.get("undeclaredVariableSuggestion", node.name, closest);
+        } else {
+          msg = messages.get("undeclaredVariable", node.name);
+        }
+
+        //
+
+        throw this.errorWithNode(msg, ReferenceError);
+      }
+    }
+  });
+}
diff --git a/packages/babel-plugin-undefined-to-void/.npmignore b/packages/babel-plugin-undefined-to-void/.npmignore
new file mode 100644
index 0000000000..cace0d6ddc
--- /dev/null
+++ b/packages/babel-plugin-undefined-to-void/.npmignore
@@ -0,0 +1,3 @@
+node_modules
+*.log
+src
diff --git a/packages/babel-plugin-undefined-to-void/README.md b/packages/babel-plugin-undefined-to-void/README.md
new file mode 100644
index 0000000000..874189d710
--- /dev/null
+++ b/packages/babel-plugin-undefined-to-void/README.md
@@ -0,0 +1,53 @@
+# babel-plugin-undefined-to-void
+
+Some JavaScript implementations allow `undefined` to be overwritten, this
+may lead to peculiar bugs that are extremely hard to track down.
+
+This plugin transforms `undefined` into `void 0` which returns `undefined`
+regardless of if it's been reassigned.
+
+## Example
+
+**In**
+
+```javascript
+foo === undefined;
+```
+
+**Out**
+
+```javascript
+foo === void 0;
+```
+
+## Installation
+
+```sh
+$ npm install babel-plugin-undefined-to-void
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["undefined-to-void"]
+}
+```
+
+### Via CLI
+
+```sh
+$ babel --plugins undefined-to-void script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["undefined-to-void"]
+});
+```
diff --git a/packages/babel-plugin-undefined-to-void/package.json b/packages/babel-plugin-undefined-to-void/package.json
new file mode 100644
index 0000000000..a26e5a108e
--- /dev/null
+++ b/packages/babel-plugin-undefined-to-void/package.json
@@ -0,0 +1,11 @@
+{
+  "name": "babel-plugin-undefined-to-void",
+  "version": "1.1.6",
+  "description": "Replace references to `undefined` with `void 0`",
+  "repository": "babel-plugins/babel-plugin-undefined-to-void",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ]
+}
diff --git a/packages/babel-plugin-undefined-to-void/src/index.js b/packages/babel-plugin-undefined-to-void/src/index.js
new file mode 100644
index 0000000000..ddbf70be76
--- /dev/null
+++ b/packages/babel-plugin-undefined-to-void/src/index.js
@@ -0,0 +1,15 @@
+export default function ({ Plugin, types: t }) {
+  return new Plugin("undefined-to-void", {
+    metadata: {
+      group: "builtin-basic"
+    },
+
+    visitor: {
+      ReferencedIdentifier(node, parent) {
+        if (node.name === "undefined") {
+          return t.unaryExpression("void", t.literal(0), true);
+        }
+      }
+    }
+  });
+}