diff --git a/src/babel/helpers/parse.js b/src/babel/helpers/parse.js
index 124407c96f..d538630011 100644
--- a/src/babel/helpers/parse.js
+++ b/src/babel/helpers/parse.js
@@ -9,10 +9,10 @@ export default function (opts, code, callback) {
     var tokens   = [];
 
     var ast = acorn.parse(code, {
-      allowImportExportEverywhere: opts.allowImportExportEverywhere,
-      allowReturnOutsideFunction:  !opts._anal,
-      ecmaVersion:                 opts.experimental ? 7 : 6,
-      playground:                  opts.playground,
+      allowImportExportEverywhere: opts.looseModules,
+      allowReturnOutsideFunction:  opts.looseModules,
+      transformers:                opts.transformers,
+      ecmaVersion:                 6,
       strictMode:                  opts.strictMode,
       onComment:                   comments,
       locations:                   true,
diff --git a/src/babel/transformation/file/index.js b/src/babel/transformation/file/index.js
index 22559262c1..453d2abb9c 100644
--- a/src/babel/transformation/file/index.js
+++ b/src/babel/transformation/file/index.js
@@ -181,10 +181,10 @@ export default class File {
     each(transform.transformers, function (transformer, key) {
       var pass = transformers[key] = transformer.buildPass(file);
 
-      if (pass.canRun(file)) {
+      if (pass.canRun) {
         stack.push(pass);
 
-        if (transformer.secondPass) {
+        if (transformer.metadata.secondPass) {
           secondaryStack.push(pass);
         }
 
@@ -274,7 +274,7 @@ export default class File {
       this.dynamicImported.push(declar);
       if (noDefault) this.dynamicImportedNoDefault.push(declar);
 
-      if (this.transformers["es6.modules"].canRun()) {
+      if (this.transformers["es6.modules"].canRun) {
         this.moduleFormatter.importSpecifier(specifiers[0], declar, this.dynamicImports);
       } else {
         this.dynamicImports.push(declar);
@@ -380,8 +380,19 @@ export default class File {
 
     var opts = this.opts;
 
-    opts.allowImportExportEverywhere = this.isLoose("es6.modules");
-    opts.strictMode = this.transformers.strict.canRun();
+    //
+
+    var parseOpts = {};
+
+    var transformers = parseOpts.transformers = {};
+    for (var key in this.transformers) {
+      transformers[key] = this.transformers[key].canRun;
+    }
+
+    parseOpts.looseModules = this.isLoose("es6.modules");
+    parseOpts.strictMode = this.transformers.strict.canRun;
+
+    //
 
     return parse(opts, code, (tree) => {
       this.transform(tree);
@@ -413,7 +424,7 @@ export default class File {
     this.lastStatements = t.getLastStatements(ast.program);
 
     var modFormatter = this.moduleFormatter = this.getModuleFormatter(this.opts.modules);
-    if (modFormatter.init && this.transformers["es6.modules"].canRun()) {
+    if (modFormatter.init && this.transformers["es6.modules"].canRun) {
       modFormatter.init();
     }
 
diff --git a/src/babel/transformation/file/options.json b/src/babel/transformation/file/options.json
index 265e4eee6a..77b1ec639e 100644
--- a/src/babel/transformation/file/options.json
+++ b/src/babel/transformation/file/options.json
@@ -19,6 +19,12 @@
 
   },
 
+  "react": {
+    "description": "",
+    "type": "boolean",
+    "default": false
+  },
+
   "highlightErrors": {
     "description": "ANSI syntax highlight error messages",
     "type": "boolean",
@@ -42,13 +48,6 @@
     "default": false
   },
 
-  "playground": {
-    "description": "Enable all playground transformers",
-    "shorthand": "p",
-    "type": "boolean",
-    "default": false
-  },
-
   "blacklist": {
     "type": "transformerList",
     "description": "Blacklist of transformers to NOT use",
diff --git a/src/babel/transformation/templates/.babelrc b/src/babel/transformation/templates/.babelrc
index e76ba80cbe..ad84f4d5b9 100644
--- a/src/babel/transformation/templates/.babelrc
+++ b/src/babel/transformation/templates/.babelrc
@@ -1,3 +1,4 @@
 {
-  "blacklist": ["useStrict", "es6.blockScoping", "regenerator"]
+  "blacklist": ["useStrict", "es6.blockScoping", "regenerator"],
+  "loose": ["es6.modules"]
 }
diff --git a/src/babel/transformation/transformer-pass.js b/src/babel/transformation/transformer-pass.js
index 0d9897f259..934f87cc98 100644
--- a/src/babel/transformation/transformer-pass.js
+++ b/src/babel/transformation/transformer-pass.js
@@ -12,10 +12,12 @@ export default class TransformerPass {
     this.shouldRun   = !transformer.check;
     this.handlers    = transformer.handlers;
     this.file        = file;
-    this.ran         = false;
+
+    this.canRun = this._canRun();
+    this.ran    = false;
   }
 
-  canRun(): boolean {
+  _canRun(): boolean {
     var transformer = this.transformer;
 
     var opts = this.file.opts;
@@ -32,14 +34,14 @@ export default class TransformerPass {
     var whitelist = opts.whitelist;
     if (whitelist.length) return includes(whitelist, key);
 
-    // experimental
-    if (transformer.experimental && opts.experimental) return true;
+    // react
+    if (transformer.metadata.react && opts.react) return true;
 
-    // playground
-    if (transformer.playground && opts.playground) return true;
+    // experimental
+    if (transformer.metadata.experimental && opts.experimental) return true;
 
     // optional
-    if (transformer.optional && !includes(opts.optional, key)) return false;
+    if (transformer.metadata.optional && !includes(opts.optional, key)) return false;
 
     return true;
   }
diff --git a/src/babel/transformation/transformer.js b/src/babel/transformation/transformer.js
index 6a05af07c1..552b160116 100644
--- a/src/babel/transformation/transformer.js
+++ b/src/babel/transformation/transformer.js
@@ -23,15 +23,11 @@ export default class Transformer {
     };
 
     this.manipulateOptions = take("manipulateOptions");
+    this.metadata          = take("metadata") || {};
     this.check             = take("check");
     this.post              = take("post");
     this.pre               = take("pre");
 
-    this.experimental = !!take("experimental");
-    this.playground   = !!take("playground");
-    this.secondPass   = !!take("secondPass");
-    this.optional     = !!take("optional");
-
     this.handlers = this.normalize(transformer);
     this.opts     ||= {};
     this.key      = transformerKey;
diff --git a/src/babel/transformation/transformers/es6/block-scoping-tdz.js b/src/babel/transformation/transformers/es6/block-scoping-tdz.js
index 0eee6bc324..08779d5c04 100644
--- a/src/babel/transformation/transformers/es6/block-scoping-tdz.js
+++ b/src/babel/transformation/transformers/es6/block-scoping-tdz.js
@@ -26,7 +26,9 @@ var visitor = {
   }
 };
 
-export var optional = true;
+export var metadata = {
+  optional: true
+};
 
 export function BlockStatement(node, parent, scope, file) {
   var letRefs = node._letReferences;
diff --git a/src/babel/transformation/transformers/es6/block-scoping.js b/src/babel/transformation/transformers/es6/block-scoping.js
index ee7e87402f..9859a93629 100644
--- a/src/babel/transformation/transformers/es6/block-scoping.js
+++ b/src/babel/transformation/transformers/es6/block-scoping.js
@@ -44,7 +44,7 @@ export function check(node) {
 export function VariableDeclaration(node, parent, scope, file) {
   if (!isLet(node, parent)) return;
 
-  if (isLetInitable(node) && file.transformers["es6.blockScopingTDZ"].canRun()) {
+  if (isLetInitable(node) && file.transformers["es6.blockScopingTDZ"].canRun) {
     var nodes = [node];
 
     for (var i = 0; i < node.declarations.length; i++) {
diff --git a/src/babel/transformation/transformers/es6/parameters.default.js b/src/babel/transformation/transformers/es6/parameters.default.js
index 82dd26e20e..7fe23b6f85 100644
--- a/src/babel/transformation/transformers/es6/parameters.default.js
+++ b/src/babel/transformation/transformers/es6/parameters.default.js
@@ -62,7 +62,7 @@ exports.Function = function (node, parent, scope, file) {
         param.traverse(iifeVisitor, state);
       }
 
-      if (file.transformers["es6.blockScopingTDZ"].canRun() && param.isIdentifier()) {
+      if (file.transformers["es6.blockScopingTDZ"].canRun && param.isIdentifier()) {
         pushDefNode(param.node, t.identifier("undefined"), i);
       }
 
diff --git a/src/babel/transformation/transformers/es6/symbols.js b/src/babel/transformation/transformers/es6/symbols.js
index 03f7ab491f..58cfe09f36 100644
--- a/src/babel/transformation/transformers/es6/symbols.js
+++ b/src/babel/transformation/transformers/es6/symbols.js
@@ -1,6 +1,8 @@
 import * as t from "../../../types";
 
-export var optional = true;
+export var metadata = {
+  optional: true
+};
 
 export function UnaryExpression(node, parent, scope, file) {
   this.skip();
diff --git a/src/babel/transformation/transformers/es7/abstract-references.js b/src/babel/transformation/transformers/es7/abstract-references.js
deleted file mode 100644
index 79f6415fad..0000000000
--- a/src/babel/transformation/transformers/es7/abstract-references.js
+++ /dev/null
@@ -1,112 +0,0 @@
-// https://github.com/zenparsing/es-abstract-refs
-
-import * as util from  "../../../util";
-import * as t from "../../../types";
-
-export var experimental = true;
-export var optional = true;
-
-var container = function (parent, call, ret, file) {
-  if (t.isExpressionStatement(parent) && !file.isConsequenceExpressionStatement(parent)) {
-    // we don't need to worry about return values
-    return call;
-  } else {
-    var exprs = [];
-    if (t.isSequenceExpression(call)) {
-      exprs = call.expressions;
-    } else {
-      exprs.push(call);
-    }
-    exprs.push(ret);
-    return t.sequenceExpression(exprs);
-  }
-};
-
-export function AssignmentExpression(node, parent, scope, file) {
-  var left = node.left;
-  if (!t.isVirtualPropertyExpression(left)) return;
-
-  var value = node.right;
-  var temp;
-
-  // we need to return `node.right`
-  if (!t.isExpressionStatement(parent)) {
-    temp = scope.generateTempBasedOnNode(node.right);
-    if (temp) value = temp;
-  }
-
-  if (node.operator !== "=") {
-    value = t.binaryExpression(
-      node.operator[0],
-      util.template("abstract-expression-get", {
-        PROPERTY: node.property,
-        OBJECT:   node.object
-      }),
-      value
-    );
-  }
-
-  var call = util.template("abstract-expression-set", {
-    PROPERTY: left.property,
-    OBJECT:   left.object,
-    VALUE:    value
-  });
-
-  if (temp) {
-    call = t.sequenceExpression([
-      t.assignmentExpression("=", temp, node.right),
-      call
-    ]);
-  }
-
-  return container(parent, call, value, file);
-}
-
-export function UnaryExpression(node, parent, scope, file) {
-  var arg = node.argument;
-  if (!t.isVirtualPropertyExpression(arg)) return;
-  if (node.operator !== "delete") return;
-
-  var call = util.template("abstract-expression-delete", {
-    PROPERTY: arg.property,
-    OBJECT:   arg.object
-  });
-
-  return container(parent, call, t.literal(true), file);
-}
-
-export function CallExpression(node, parent, scope) {
-  var callee = node.callee;
-  if (!t.isVirtualPropertyExpression(callee)) return;
-
-  var temp = scope.generateTempBasedOnNode(callee.object);
-
-  var call = util.template("abstract-expression-call", {
-    PROPERTY: callee.property,
-    OBJECT:   temp || callee.object
-  });
-
-  call.arguments = call.arguments.concat(node.arguments);
-
-  if (temp) {
-    return t.sequenceExpression([
-      t.assignmentExpression("=", temp, callee.object),
-      call
-    ]);
-  } else {
-    return call;
-  }
-}
-
-export function VirtualPropertyExpression(node) {
-  return util.template("abstract-expression-get", {
-    PROPERTY: node.property,
-    OBJECT:   node.object
-  });
-}
-
-export function PrivateDeclaration(node) {
-  return t.variableDeclaration("const", node.declarations.map(function (id) {
-    return t.variableDeclarator(id, t.newExpression(t.identifier("WeakMap"), []));
-  }));
-}
diff --git a/src/babel/transformation/transformers/es7/comprehensions.js b/src/babel/transformation/transformers/es7/comprehensions.js
index 901f42e7e2..986f5eeb36 100644
--- a/src/babel/transformation/transformers/es7/comprehensions.js
+++ b/src/babel/transformation/transformers/es7/comprehensions.js
@@ -3,8 +3,10 @@ import traverse from "../../../traversal";
 import * as util from  "../../../util";
 import * as t from "../../../types";
 
-export var experimental = true;
-export var optional = true;
+export var metadata = {
+  experimental: true,
+  optional: true
+};
 
 export function ComprehensionExpression(node, parent, scope, file) {
   var callback = array;
diff --git a/src/babel/transformation/transformers/es7/exponentiation-operator.js b/src/babel/transformation/transformers/es7/exponentiation-operator.js
index e5106b938c..5ff6319fe9 100644
--- a/src/babel/transformation/transformers/es7/exponentiation-operator.js
+++ b/src/babel/transformation/transformers/es7/exponentiation-operator.js
@@ -3,8 +3,9 @@
 import build from "../../helpers/build-binary-assignment-operator-transformer";
 import * as t from "../../../types";
 
-export var experimental = true;
-export var optional = true;
+export var metadata = {
+  optional: true
+};
 
 var MATH_POW = t.memberExpression(t.identifier("Math"), t.identifier("pow"));
 
diff --git a/src/babel/transformation/transformers/es7/object-rest-spread.js b/src/babel/transformation/transformers/es7/object-rest-spread.js
index 257064dbcd..eea9f9fa1c 100644
--- a/src/babel/transformation/transformers/es7/object-rest-spread.js
+++ b/src/babel/transformation/transformers/es7/object-rest-spread.js
@@ -2,8 +2,11 @@
 
 import * as t from "../../../types";
 
-export var experimental = true;
-export var optional = true;
+export var metadata = {
+  experimental: true,
+  optional: true,
+  react: true
+};
 
 export function manipulateOptions(opts) {
   if (opts.whitelist.length) opts.whitelist.push("es6.destructuring");
diff --git a/src/babel/transformation/transformers/index.js b/src/babel/transformation/transformers/index.js
index 810ea2ad2b..c1c470762d 100644
--- a/src/babel/transformation/transformers/index.js
+++ b/src/babel/transformation/transformers/index.js
@@ -44,7 +44,6 @@ export default {
 
   "es6.regex.sticky":                      require("./es6/regex.sticky"),
   "es6.regex.unicode":                     require("./es6/regex.unicode"),
-  "es7.abstractReferences":                require("./es7/abstract-references"),
 
   "es6.constants":                         require("./es6/constants"),
 
diff --git a/src/babel/transformation/transformers/internal/declarations.js b/src/babel/transformation/transformers/internal/declarations.js
index 01dd233eab..c8977eeb22 100644
--- a/src/babel/transformation/transformers/internal/declarations.js
+++ b/src/babel/transformation/transformers/internal/declarations.js
@@ -1,7 +1,9 @@
 import * as strict from "../../helpers/strict";
 import * as t from "../../../types";
 
-export var secondPass = true;
+export var metadata = {
+  secondPass: true
+};
 
 export function BlockStatement(node, parent, scope, file) {
   if (!node._declarations) return;
diff --git a/src/babel/transformation/transformers/internal/module-formatter.js b/src/babel/transformation/transformers/internal/module-formatter.js
index 5d17476725..a1a9e6de65 100644
--- a/src/babel/transformation/transformers/internal/module-formatter.js
+++ b/src/babel/transformation/transformers/internal/module-formatter.js
@@ -5,7 +5,7 @@ export function Program(program, parent, scope, file) {
     program.body = file.dynamicImports.concat(program.body);
   });
 
-  if (!file.transformers["es6.modules"].canRun()) return;
+  if (!file.transformers["es6.modules"].canRun) return;
 
   if (file.moduleFormatter.transform) {
     file.moduleFormatter.transform(program);
diff --git a/src/babel/transformation/transformers/internal/strict.js b/src/babel/transformation/transformers/internal/strict.js
index 861988daae..1cd910a20b 100644
--- a/src/babel/transformation/transformers/internal/strict.js
+++ b/src/babel/transformation/transformers/internal/strict.js
@@ -1,7 +1,7 @@
 import * as t from "../../../types";
 
 export function Program(program, parent, scope, file) {
-  if (file.transformers.strict.canRun()) {
+  if (file.transformers.strict.canRun) {
     var directive = file.get("existingStrictDirective");
 
     if (!directive) {
diff --git a/src/babel/transformation/transformers/other/async-to-generator.js b/src/babel/transformation/transformers/other/async-to-generator.js
index 9c56559c39..7789fd2506 100644
--- a/src/babel/transformation/transformers/other/async-to-generator.js
+++ b/src/babel/transformation/transformers/other/async-to-generator.js
@@ -2,7 +2,9 @@ import remapAsyncToGenerator from "../../helpers/remap-async-to-generator";
 
 export { manipulateOptions } from "./bluebird-coroutines";
 
-export var optional = true;
+export var metadata = {
+  optional: true
+};
 
 exports.Function = function (node, parent, scope, file) {
   if (!node.async || node.generator) return;
diff --git a/src/babel/transformation/transformers/other/bluebird-coroutines.js b/src/babel/transformation/transformers/other/bluebird-coroutines.js
index 67a8a474c0..da3bfd146e 100644
--- a/src/babel/transformation/transformers/other/bluebird-coroutines.js
+++ b/src/babel/transformation/transformers/other/bluebird-coroutines.js
@@ -6,7 +6,9 @@ export function manipulateOptions(opts) {
   opts.blacklist.push("regenerator");
 }
 
-export var optional = true;
+export var metadata = {
+  optional: true
+};
 
 exports.Function = function (node, parent, scope, file) {
   if (!node.async || node.generator) return;
diff --git a/src/babel/transformation/transformers/other/flow.js b/src/babel/transformation/transformers/other/flow.js
index bb6bf4c393..d065bf4bd2 100644
--- a/src/babel/transformation/transformers/other/flow.js
+++ b/src/babel/transformation/transformers/other/flow.js
@@ -1,5 +1,9 @@
 import * as t from "../../../types";
 
+export var metadata = {
+  react: true
+};
+
 export function Flow(node) {
   this.remove();
 }
diff --git a/src/babel/transformation/transformers/other/react-compat.js b/src/babel/transformation/transformers/other/react-compat.js
index 49e37338f1..14a7070768 100644
--- a/src/babel/transformation/transformers/other/react-compat.js
+++ b/src/babel/transformation/transformers/other/react-compat.js
@@ -5,7 +5,10 @@ export function manipulateOptions(opts) {
   opts.blacklist.push("react");
 }
 
-export var optional = true;
+export var metadata = {
+  optional: true,
+  react: true
+};
 
 require("../../helpers/build-react-transformer")(exports, {
   pre(state) {
diff --git a/src/babel/transformation/transformers/other/react.js b/src/babel/transformation/transformers/other/react.js
index 2b098e5461..da00e89c32 100644
--- a/src/babel/transformation/transformers/other/react.js
+++ b/src/babel/transformation/transformers/other/react.js
@@ -3,6 +3,10 @@ import * as t from "../../../types";
 
 var JSX_ANNOTATION_REGEX = /^\*\s*@jsx\s+([^\s]+)/;
 
+export var metadata = {
+  react: true
+};
+
 export function Program(node, parent, scope, file) {
   var id = "React.createElement";
 
diff --git a/src/babel/transformation/transformers/other/runtime.js b/src/babel/transformation/transformers/other/runtime.js
index ec2de99541..ce4c11203f 100644
--- a/src/babel/transformation/transformers/other/runtime.js
+++ b/src/babel/transformation/transformers/other/runtime.js
@@ -69,7 +69,10 @@ var astVisitor = {
   }
 };
 
-export var optional = true;
+export var metadata = {
+  optional: true,
+  react: true
+};
 
 export function manipulateOptions(opts) {
   if (opts.whitelist.length) opts.whitelist.push("es6.modules");
diff --git a/src/babel/transformation/transformers/spec/proto-to-assign.js b/src/babel/transformation/transformers/spec/proto-to-assign.js
index 188d21c03b..6f6905784a 100644
--- a/src/babel/transformation/transformers/spec/proto-to-assign.js
+++ b/src/babel/transformation/transformers/spec/proto-to-assign.js
@@ -14,8 +14,10 @@ function buildDefaultsCallExpression(expr, ref, file) {
   return t.expressionStatement(t.callExpression(file.addHelper("defaults"), [ref, expr.right]));
 }
 
-export var secondPass = true;
-export var optional = true;
+export var metadata = {
+  secondPass: true,
+  optional: true
+};
 
 export function AssignmentExpression(node, parent, scope, file) {
   if (!isProtoAssignmentExpression(node)) return;
diff --git a/src/babel/transformation/transformers/spec/undefined-to-void.js b/src/babel/transformation/transformers/spec/undefined-to-void.js
index ddd7af5317..30b2e17da8 100644
--- a/src/babel/transformation/transformers/spec/undefined-to-void.js
+++ b/src/babel/transformation/transformers/spec/undefined-to-void.js
@@ -1,6 +1,9 @@
 import * as t from "../../../types";
 
-export var optional = true;
+export var metadata = {
+  optional: true,
+  react: true
+};
 
 export function Identifier(node, parent) {
   if (node.name === "undefined" && this.isReferenced()) {
diff --git a/src/babel/transformation/transformers/utility/dead-code-elimination.js b/src/babel/transformation/transformers/utility/dead-code-elimination.js
index bda19f668d..7f2ed39086 100644
--- a/src/babel/transformation/transformers/utility/dead-code-elimination.js
+++ b/src/babel/transformation/transformers/utility/dead-code-elimination.js
@@ -17,7 +17,9 @@ function toStatements(node) {
   return node;
 }
 
-export var optional = true;
+export var metadata = {
+  optional: true
+};
 
 export function ConditionalExpression(node, parent, scope) {
   var evaluateTest = this.get("test").evaluateTruthy();
diff --git a/src/babel/transformation/transformers/utility/inline-environment-variables.js b/src/babel/transformation/transformers/utility/inline-environment-variables.js
index 5e2cabb55c..97725fbc51 100644
--- a/src/babel/transformation/transformers/utility/inline-environment-variables.js
+++ b/src/babel/transformation/transformers/utility/inline-environment-variables.js
@@ -1,6 +1,8 @@
 import * as t from "../../../types";
 
-export var optional = true;
+export var metadata = {
+  optional: true
+};
 
 var match = t.buildMatchMemberExpression("process.env");
 
diff --git a/src/babel/transformation/transformers/utility/inline-expressions.js b/src/babel/transformation/transformers/utility/inline-expressions.js
index f1be106014..437cce640d 100644
--- a/src/babel/transformation/transformers/utility/inline-expressions.js
+++ b/src/babel/transformation/transformers/utility/inline-expressions.js
@@ -1,6 +1,8 @@
 import * as t from "../../../types";
 
-export var optional = true;
+export var metadata = {
+  optional: true
+};
 
 export function Expression(node, parent, scope) {
   var res = this.evaluate();
diff --git a/src/babel/transformation/transformers/utility/remove-console.js b/src/babel/transformation/transformers/utility/remove-console.js
index 9fe1f491a9..317840ce3e 100644
--- a/src/babel/transformation/transformers/utility/remove-console.js
+++ b/src/babel/transformation/transformers/utility/remove-console.js
@@ -1,6 +1,8 @@
 import * as t from "../../../types";
 
-export var optional = true;
+export var metadata = {
+  optional: true
+};
 
 export function CallExpression(node, parent) {
   if (this.get("callee").matchesPattern("console", true)) {
diff --git a/src/babel/transformation/transformers/utility/remove-debugger.js b/src/babel/transformation/transformers/utility/remove-debugger.js
index 45d5727340..f7d84d0e81 100644
--- a/src/babel/transformation/transformers/utility/remove-debugger.js
+++ b/src/babel/transformation/transformers/utility/remove-debugger.js
@@ -1,6 +1,8 @@
 import * as t from "../../../types";
 
-export var optional = true;
+export var metadata = {
+  optional: true
+};
 
 export function ExpressionStatement(node) {
   if (this.get("expression").isIdentifier({ name: "debugger" })) {
diff --git a/src/babel/transformation/transformers/validation/undeclared-variable-check.js b/src/babel/transformation/transformers/validation/undeclared-variable-check.js
index 153c7d5745..f8d3b25a78 100644
--- a/src/babel/transformation/transformers/validation/undeclared-variable-check.js
+++ b/src/babel/transformation/transformers/validation/undeclared-variable-check.js
@@ -1,7 +1,9 @@
 import levenshtein from "leven";
 import * as messages from "../../../messages";
 
-export var optional = true;
+export var metadata = {
+  optional: true
+};
 
 export function Identifier(node, parent, scope, file) {
   if (!this.isReferenced()) return;
diff --git a/src/babel/util.js b/src/babel/util.js
index d3b271ecc1..c61fef5ba9 100644
--- a/src/babel/util.js
+++ b/src/babel/util.js
@@ -78,7 +78,7 @@ var templateVisitor = {
       return nodes[node.name];
     }
   }
-}
+};
 
 //
 
@@ -109,7 +109,7 @@ export function template(name: string, nodes?: Array<Object>, keepExpression?: b
 }
 
 export function parseTemplate(loc: string, code: string): Object {
-  var ast = parse({ filename: loc }, code).program;
+  var ast = parse({ filename: loc, looseModules: true }, code).program;
   ast = traverse.removeProperties(ast);
   return ast;
 }
diff --git a/test/fixtures/transformation/es7-abstract-references/call/actual.js b/test/fixtures/transformation/es7-abstract-references/call/actual.js
deleted file mode 100644
index 51355b9a69..0000000000
--- a/test/fixtures/transformation/es7-abstract-references/call/actual.js
+++ /dev/null
@@ -1,6 +0,0 @@
-foo::bar();
-foo::bar("arg");
-
-var test = "test";
-test::bar();
-test::bar("arg");
diff --git a/test/fixtures/transformation/es7-abstract-references/call/expected.js b/test/fixtures/transformation/es7-abstract-references/call/expected.js
deleted file mode 100644
index 55bdecc949..0000000000
--- a/test/fixtures/transformation/es7-abstract-references/call/expected.js
+++ /dev/null
@@ -1,10 +0,0 @@
-"use strict";
-
-var _foo, _foo2;
-
-_foo = foo, bar[Symbol.referenceGet](_foo).call(_foo);
-_foo2 = foo, bar[Symbol.referenceGet](_foo2).call(_foo2, "arg");
-
-var test = "test";
-bar[Symbol.referenceGet](test).call(test);
-bar[Symbol.referenceGet](test).call(test, "arg");
diff --git a/test/fixtures/transformation/es7-abstract-references/delete/actual.js b/test/fixtures/transformation/es7-abstract-references/delete/actual.js
deleted file mode 100644
index af9f86c23c..0000000000
--- a/test/fixtures/transformation/es7-abstract-references/delete/actual.js
+++ /dev/null
@@ -1,3 +0,0 @@
-delete foo::bar;
-
-if (delete foo::bar) {}
diff --git a/test/fixtures/transformation/es7-abstract-references/delete/expected.js b/test/fixtures/transformation/es7-abstract-references/delete/expected.js
deleted file mode 100644
index 489c0b7863..0000000000
--- a/test/fixtures/transformation/es7-abstract-references/delete/expected.js
+++ /dev/null
@@ -1,5 +0,0 @@
-"use strict";
-
-bar[Symbol.referenceDelete](foo);
-
-if ((bar[Symbol.referenceDelete](foo), true)) {}
diff --git a/test/fixtures/transformation/es7-abstract-references/get/actual.js b/test/fixtures/transformation/es7-abstract-references/get/actual.js
deleted file mode 100644
index d6a275fb29..0000000000
--- a/test/fixtures/transformation/es7-abstract-references/get/actual.js
+++ /dev/null
@@ -1 +0,0 @@
-foo::bar;
diff --git a/test/fixtures/transformation/es7-abstract-references/get/expected.js b/test/fixtures/transformation/es7-abstract-references/get/expected.js
deleted file mode 100644
index 70419d5d74..0000000000
--- a/test/fixtures/transformation/es7-abstract-references/get/expected.js
+++ /dev/null
@@ -1,3 +0,0 @@
-"use strict";
-
-bar[Symbol.referenceGet](foo);
diff --git a/test/fixtures/transformation/es7-abstract-references/options.json b/test/fixtures/transformation/es7-abstract-references/options.json
deleted file mode 100644
index 252f473a73..0000000000
--- a/test/fixtures/transformation/es7-abstract-references/options.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "experimental": true
-}
diff --git a/test/fixtures/transformation/es7-abstract-references/private/actual.js b/test/fixtures/transformation/es7-abstract-references/private/actual.js
deleted file mode 100644
index 9643ff19c2..0000000000
--- a/test/fixtures/transformation/es7-abstract-references/private/actual.js
+++ /dev/null
@@ -1,12 +0,0 @@
-private A;
-private B, C;
-
-class D {
-  private E;
-  private F, G;
-}
-
-var H = class {
-  private I;
-  private J, K;
-};
diff --git a/test/fixtures/transformation/es7-abstract-references/private/expected.js b/test/fixtures/transformation/es7-abstract-references/private/expected.js
deleted file mode 100644
index 53ef631e1d..0000000000
--- a/test/fixtures/transformation/es7-abstract-references/private/expected.js
+++ /dev/null
@@ -1,30 +0,0 @@
-"use strict";
-
-var _classCallCheck = function (instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } };
-
-var A = new WeakMap();
-var B = new WeakMap(),
-    C = new WeakMap();
-
-var D = (function () {
-  var F = new WeakMap(),
-      G = new WeakMap();
-  var E = new WeakMap();
-
-  function D() {
-    _classCallCheck(this, D);
-  }
-
-  return D;
-})();
-
-var H = (function () {
-  var _class = function H() {
-    _classCallCheck(this, _class);
-  };
-
-  var J = new WeakMap(),
-      K = new WeakMap();
-  var I = new WeakMap();
-  return _class;
-})();
\ No newline at end of file
diff --git a/test/fixtures/transformation/es7-abstract-references/set/actual.js b/test/fixtures/transformation/es7-abstract-references/set/actual.js
deleted file mode 100644
index 8abf694209..0000000000
--- a/test/fixtures/transformation/es7-abstract-references/set/actual.js
+++ /dev/null
@@ -1,3 +0,0 @@
-var baz = "foo";
-foo::bar = baz;
-if (foo::bar = baz) {}
diff --git a/test/fixtures/transformation/es7-abstract-references/set/expected.js b/test/fixtures/transformation/es7-abstract-references/set/expected.js
deleted file mode 100644
index be9e6ef9f3..0000000000
--- a/test/fixtures/transformation/es7-abstract-references/set/expected.js
+++ /dev/null
@@ -1,5 +0,0 @@
-"use strict";
-
-var baz = "foo";
-bar[Symbol.referenceSet](foo, baz);
-if ((bar[Symbol.referenceSet](foo, baz), baz)) {}
diff --git a/test/fixtures/transformation/es7-exponentian-operator/options.json b/test/fixtures/transformation/es7-exponentian-operator/options.json
deleted file mode 100644
index 252f473a73..0000000000
--- a/test/fixtures/transformation/es7-exponentian-operator/options.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "experimental": true
-}
diff --git a/test/fixtures/transformation/flow/options.json b/test/fixtures/transformation/flow/options.json
index 8b2cc18046..3a3fa17bcc 100644
--- a/test/fixtures/transformation/flow/options.json
+++ b/test/fixtures/transformation/flow/options.json
@@ -1,4 +1,5 @@
 {
+  "react": true,
   "experimental": true,
   "whitelist": ["flow"],
   "noCheckAst": true
diff --git a/test/fixtures/transformation/react-compat/options.json b/test/fixtures/transformation/react-compat/options.json
index c5c0827325..13d5574572 100644
--- a/test/fixtures/transformation/react-compat/options.json
+++ b/test/fixtures/transformation/react-compat/options.json
@@ -1,4 +1,5 @@
 {
+  "react": true,
   "blacklist": "strict",
   "optional": "reactCompat"
 }
diff --git a/test/fixtures/transformation/react/options.json b/test/fixtures/transformation/react/options.json
index b9dd7b83b7..c2feab8b56 100644
--- a/test/fixtures/transformation/react/options.json
+++ b/test/fixtures/transformation/react/options.json
@@ -1,3 +1,4 @@
 {
+  "react": true,
   "blacklist": ["strict"]
 }