add some more flow types

packages/babel-types/src/converters.js

@@ -1,3 +1,5 @@
+/* @noflow */
+
 import isPlainObject from "lodash/lang/isPlainObject";
 import isNumber from "lodash/lang/isNumber";
 import isRegExp from "lodash/lang/isRegExp";
@@ -218,7 +220,7 @@ export function toExpression(node: Object): Object {
   }
 }
 
-export function toBlock(node, parent: Object): Object {
+export function toBlock(node: Object, parent: Object): Object {
   if (t.isBlockStatement(node)) {
     return node;
   }

packages/babel-types/src/flow.js

@@ -1,3 +1,5 @@
+/* @flow */
+
 import * as t from "./index";
 
 /**
@@ -19,7 +21,7 @@ export function createUnionTypeAnnotation(types: Array<Object>) {
  * Dedupe type annotations.
  */
 
-export function removeTypeDuplicates(nodes: Array<Object>) {
+export function removeTypeDuplicates(nodes: Array<Object>): Array<Object> {
   let generics = {};
   let bases = {};
 

packages/babel-types/src/index.js

@@ -1,4 +1,4 @@
-/* @noflow */
+/* @flow */
 
 import toFastProperties from "to-fast-properties";
 import compact from "lodash/array/compact";
@@ -406,6 +406,7 @@ export function inherits(child: Object, parent: Object): Object {
 
 export function assertNode(node?) {
   if (!isNode(node)) {
+    // $FlowFixMe
     throw new TypeError("Not a valid node " + (node && node.type));
   }
 }

packages/babel-types/src/validators.js

@@ -1,3 +1,5 @@
+/* @flow */
+
 import { getBindingIdentifiers } from "./retrievers";
 import esutils from "esutils";
 import * as t from "./index";
@@ -67,7 +69,7 @@ export function isReferenced(node: Object, parent: Object): boolean {
     case "ArrowFunctionExpression":
     case "FunctionDeclaration":
     case "FunctionExpression":
-      for (let param of (parent.params: Array)) {
+      for (let param of (parent.params: Array<any>)) {
         if (param === node) return false;
       }