Validate importKind and ensure code generation exists.

packages/babel-generator/src/generators/modules.js

@@ -1,6 +1,11 @@
 import * as t from "babel-types";
 
 export function ImportSpecifier(node: Object) {
+  if (node.importKind === "type" || node.importKind === "typeof") {
+    this.word(node.importKind);
+    this.space();
+  }
+
   this.print(node.imported, node);
   if (node.local && node.local.name !== node.imported.name) {
     this.space();

packages/babel-generator/test/fixtures/flow/type-annotations/actual.js

@@ -97,6 +97,10 @@ import type { foo as bar } from "baz";
 import type from "foo";
 import type, { foo } from "bar";
 import type * as namespace from "bar";
+import { type Foo } from "bar";
+import { typeof Foo } from "bar";
+import { type Foo as Bar } from "bar";
+import { typeof Foo as Bar } from "bar";
 export type { foo };
 export type { bar } from "bar";
 export interface baz { p: number };

packages/babel-generator/test/fixtures/flow/type-annotations/expected.js

@@ -101,6 +101,10 @@ import type { foo as bar } from "baz";
 import type from "foo";
 import type, { foo } from "bar";
 import type * as namespace from "bar";
+import { type Foo } from "bar";
+import { typeof Foo } from "bar";
+import { type Foo as Bar } from "bar";
+import { typeof Foo as Bar } from "bar";
 export type { foo };
 export type { bar } from "bar";
 export interface baz { p: number };

packages/babel-types/src/definitions/es2015.js

@@ -227,6 +227,10 @@ defineType("ImportSpecifier", {
     },
     imported: {
       validate: assertNodeType("Identifier")
+    },
+    importKind: {
+      // Handle Flowtype's extension "import {typeof foo} from"
+      validate: assertOneOf(null, "type", "typeof")
     }
   }
 });