diff --git a/packages/babel-core/src/transformation/file/index.js b/packages/babel-core/src/transformation/file/index.js
index 01d5b7efc9d3..9c1867294f85 100644
--- a/packages/babel-core/src/transformation/file/index.js
+++ b/packages/babel-core/src/transformation/file/index.js
@@ -7,7 +7,8 @@ import convertSourceMap from "convert-source-map";
 import OptionManager from "./options/option-manager";
 import type Pipeline from "../pipeline";
 import PluginPass from "../plugin-pass";
-import { NodePath, Hub, Scope } from "babel-traverse";
+import { NodePath, Scope } from "babel-traverse";
+import type { HubInterface } from "babel-traverse";
 import sourceMap from "source-map";
 import generate from "babel-generator";
 import codeFrame from "babel-code-frame";
@@ -99,7 +100,21 @@ export default class File extends Store {
     this.code    = "";
     this.shebang = "";
 
-    this.hub = new Hub(this);
+    this.hub = {
+      // keep it for the usage in babel-core, ex: path.hub.file.opts.filename
+      file: this,
+      mark: (type: string, message: string, loc: Object) => {
+        this.metadata.marked.push({
+          type,
+          message,
+          loc
+        });
+      },
+      addHelper: this.addHelper.bind(this),
+      getCode: () => this.code,
+      getScope: () => this.scope,
+      buildError: this.buildCodeFrameError.bind(this)
+    };
   }
 
   static helpers: Array<string>;
@@ -119,7 +134,7 @@ export default class File extends Store {
   ast: Object;
   scope: Scope;
   metadata: BabelFileMetadata;
-  hub: Hub;
+  hub: HubInterface;
   code: string;
   shebang: string;
 
diff --git a/packages/babel-plugin-transform-react-jsx-source/src/index.js b/packages/babel-plugin-transform-react-jsx-source/src/index.js
index cd296af979a0..c2a1ab909a4a 100644
--- a/packages/babel-plugin-transform-react-jsx-source/src/index.js
+++ b/packages/babel-plugin-transform-react-jsx-source/src/index.js
@@ -50,7 +50,10 @@ export default function ({ types: t }) {
           : null;
 
         const fileNameIdentifier = path.scope.generateUidIdentifier(FILE_NAME_VAR);
-        path.hub.file.scope.push({id: fileNameIdentifier, init: t.stringLiteral(fileName)});
+        const scope = path.hub.getScope();
+        if (scope) {
+          scope.push({id: fileNameIdentifier, init: t.stringLiteral(fileName)});
+        }
         state.fileNameIdentifier = fileNameIdentifier;
       }
 
diff --git a/packages/babel-traverse/src/hub.js b/packages/babel-traverse/src/hub.js
index f05eaa813680..d4151a16ed59 100644
--- a/packages/babel-traverse/src/hub.js
+++ b/packages/babel-traverse/src/hub.js
@@ -1,6 +1,14 @@
+import Scope from "./scope";
+export interface HubInterface {
+  mark?: (type: string, message: string) => void;
+  addHelper?: (name: string) => Object;
+  getScope?: () => Scope;
+  getCode?: () => string;
+  buildError:(node: Object, msg: string, Error: Error) => Error;
+}
+
 export default class Hub {
-  constructor(file, options) {
-    this.file = file;
-    this.options = options;
+  buildError(node, msg, BuildError = TypeError): Error {
+    return new BuildError(msg);
   }
 }
diff --git a/packages/babel-traverse/src/index.js b/packages/babel-traverse/src/index.js
index 6a3d4660a4b7..a3f508f819f1 100644
--- a/packages/babel-traverse/src/index.js
+++ b/packages/babel-traverse/src/index.js
@@ -7,10 +7,12 @@ import includes from "lodash/includes";
 import * as t from "babel-types";
 import * as cache from "./cache";
 
-export { default as NodePath } from "./path";
-export { default as Scope } from "./scope";
-export { default as Hub } from "./hub";
-export { visitors };
+import NodePath from "./path";
+import Scope from "./scope";
+import Hub from "./hub";
+
+export { visitors, NodePath, Scope, Hub };
+export type { HubInterface } from "./hub";
 
 export default function traverse(
   parent: Object | Array<Object>,
@@ -37,9 +39,9 @@ traverse.visitors = visitors;
 traverse.verify = visitors.verify;
 traverse.explode = visitors.explode;
 
-traverse.NodePath = require("./path");
-traverse.Scope    = require("./scope");
-traverse.Hub      = require("./hub");
+traverse.NodePath = NodePath;
+traverse.Scope    = Scope;
+traverse.Hub      = Hub;
 
 traverse.cheap = function (node, enter) {
   return t.traverseFast(node, enter);
diff --git a/packages/babel-traverse/src/path/index.js b/packages/babel-traverse/src/path/index.js
index 1b5b58919018..a8ec5a6013e0 100644
--- a/packages/babel-traverse/src/path/index.js
+++ b/packages/babel-traverse/src/path/index.js
@@ -116,7 +116,7 @@ export default class NodePath {
   }
 
   buildCodeFrameError(msg: string, Error: typeof Error = SyntaxError): Error {
-    return this.hub.file.buildCodeFrameError(this.node, msg, Error);
+    return this.hub.buildError(this.node, msg, Error);
   }
 
   traverse(visitor: Object, state?: any) {
@@ -124,11 +124,9 @@ export default class NodePath {
   }
 
   mark(type: string, message: string) {
-    this.hub.file.metadata.marked.push({
-      type,
-      message,
-      loc: this.node.loc
-    });
+    if (this.hub.mark) {
+      this.hub.mark(type, message, this.node.loc);
+    }
   }
 
   set(key: string, node: Object) {
diff --git a/packages/babel-traverse/src/path/introspection.js b/packages/babel-traverse/src/path/introspection.js
index be7a2755c537..93d7b36c6419 100644
--- a/packages/babel-traverse/src/path/introspection.js
+++ b/packages/babel-traverse/src/path/introspection.js
@@ -235,10 +235,12 @@ export function referencesImport(moduleSource, importName) {
 export function getSource() {
   let node = this.node;
   if (node.end) {
-    return this.hub.file.code.slice(node.start, node.end);
-  } else {
-    return "";
+    const code = this.hub.getCode();
+    if (code) {
+      return code.slice(node.start, node.end);
+    }
   }
+  return "";
 }
 
 export function willIMaybeExecuteBefore(target) {
diff --git a/packages/babel-traverse/src/scope/index.js b/packages/babel-traverse/src/scope/index.js
index 83e80df926a8..3757a116cc42 100644
--- a/packages/babel-traverse/src/scope/index.js
+++ b/packages/babel-traverse/src/scope/index.js
@@ -350,7 +350,8 @@ export default class Scope {
     if (!duplicate) duplicate = local.kind === "param" && (kind === "let" || kind === "const");
 
     if (duplicate) {
-      throw this.hub.file.buildCodeFrameError(id, messages.get("scopeDuplicateDeclaration", name), TypeError);
+      const errorMsg = messages.get("scopeDuplicateDeclaration", name);
+      throw this.hub.buildError ? this.hub.buildError(id, errorMsg, TypeError) : new TypeError(errorMsg);
     }
   }
 
@@ -389,7 +390,6 @@ export default class Scope {
   }
 
   toArray(node: Object, i?: number) {
-    let file = this.hub.file;
 
     if (t.isIdentifier(node)) {
       let binding = this.getBinding(node.name);
@@ -423,9 +423,9 @@ export default class Scope {
     } else if (i) {
       args.push(t.numericLiteral(i));
       helperName = "slicedToArray";
-      // TODO if (this.hub.file.isLoose("es6.forOf")) helperName += "-loose";
+      // TODO if (this.hub.isLoose("es6.forOf")) helperName += "-loose";
     }
-    return t.callExpression(file.addHelper(helperName), args);
+    return t.callExpression(this.hub.addHelper(helperName), args);
   }
 
   hasLabel(name: string) {
diff --git a/packages/babel-traverse/test/hub.js b/packages/babel-traverse/test/hub.js
new file mode 100644
index 000000000000..a3d67bb9d88c
--- /dev/null
+++ b/packages/babel-traverse/test/hub.js
@@ -0,0 +1,13 @@
+const assert = require("assert");
+const Hub = require("../lib").default.Hub;
+
+describe("hub", function () {
+  it("default buildError should return TypeError", function () {
+    const hub = new Hub();
+    const msg = "test_msg";
+    assert.deepEqual(
+      hub.buildError(null, msg),
+      new TypeError(msg)
+    );
+  });
+});