Misc Flow and import fixes

1. Fixed all reported Flow errors
2. Added a few missing package declarations
3. Deleted ReactDebugHooks fork in favor of react-debug-tools

Author: Brian Vaughn

packages/react-debug-tools/src/ReactDebugHooks.js

@@ -253,14 +253,14 @@ const Dispatcher: DispatcherType = {
 
 // Inspect
 
-type HooksNode = {
+export type HooksNode = {
   id: number | null,
   isStateEditable: boolean,
   name: string,
   value: mixed,
   subHooks: Array<HooksNode>,
 };
-type HooksTree = Array<HooksNode>;
+export type HooksTree = Array<HooksNode>;
 
 // Don't assume
 //

packages/react-devtools-core/src/standalone.js

@@ -300,7 +300,9 @@ function startServer(port?: number = 8097) {
     close: function() {
       connected = null;
       onDisconnected();
-      clearTimeout(startServerTimeoutID);
+      if (startServerTimeoutID !== null) {
+        clearTimeout(startServerTimeoutID);
+      }
       server.close();
       httpServer.close();
     },

packages/react-devtools-extensions/flow.js

@@ -1,6 +1,6 @@
 // @flow
 
-declare module 'events' {
+declare module 'node-events' {
   declare class EventEmitter<Events: Object> {
     addListener<Event: $Keys<Events>>(
       event: Event,

packages/react-devtools-shared/package.json

@@ -8,6 +8,7 @@
     "clipboard-js": "^0.3.6",
     "lodash.throttle": "^4.1.1",
     "memoize-one": "^3.1.1",
+    "node-events": "npm:events@^3.0.0",
     "react-virtualized-auto-sizer": "^1.0.2"
   }
 }

packages/react-devtools-shared/src/__tests__/storeOwners-test.js

@@ -1,6 +1,6 @@
 // @flow
 
-const { printOwnersList } = require('./storeSerializer');
+const { printOwnersList } = require('../devtools/utils');
 
 describe('Store owners list', () => {
   let React;

packages/react-devtools-shared/src/__tests__/storeSerializer.js

@@ -1,3 +1,5 @@
+import { printStore } from 'react-devtools-shared/src/devtools/utils'
+
 // test() is part of Jest's serializer API
 export function test(maybeStore) {
   // It's important to lazy-require the Store rather than imported at the head of the module.
@@ -11,74 +13,6 @@ export function print(store, serialize, indent) {
   return printStore(store);
 }
 
-export function printElement(element, includeWeight = false) {
-  let prefix = ' ';
-  if (element.children.length > 0) {
-    prefix = element.isCollapsed ? '▸' : '▾';
-  }
-
-  let key = '';
-  if (element.key !== null) {
-    key = ` key="${element.key}"`;
-  }
-
-  let hocs = '';
-  if (element.hocDisplayNames !== null) {
-    hocs = ` [${element.hocDisplayNames.join('][')}]`;
-  }
-
-  let suffix = '';
-  if (includeWeight) {
-    suffix = ` (${element.isCollapsed ? 1 : element.weight})`;
-  }
-
-  return `${'  '.repeat(element.depth + 1)}${prefix} <${element.displayName ||
-    'null'}${key}>${hocs}${suffix}`;
-}
-
-export function printOwnersList(elements, includeWeight = false) {
-  return elements
-    .map(element => printElement(element, includeWeight))
-    .join('\n');
-}
-
 // Used for Jest snapshot testing.
 // May also be useful for visually debugging the tree, so it lives on the Store.
-export function printStore(store, includeWeight = false) {
-  const snapshotLines = [];
-
-  let rootWeight = 0;
-
-  store.roots.forEach(rootID => {
-    const { weight } = store.getElementByID(rootID);
-
-    snapshotLines.push('[root]' + (includeWeight ? ` (${weight})` : ''));
-
-    for (let i = rootWeight; i < rootWeight + weight; i++) {
-      const element = store.getElementAtIndex(i);
-
-      if (element == null) {
-        throw Error(`Could not find element at index ${i}`);
-      }
-
-      snapshotLines.push(printElement(element, includeWeight));
-    }
-
-    rootWeight += weight;
-  });
-
-  // Make sure the pretty-printed test align with the Store's reported number of total rows.
-  if (rootWeight !== store.numElements) {
-    throw Error(
-      `Inconsistent Store state. Individual root weights (${rootWeight}) do not match total weight (${
-        store.numElements
-      })`
-    );
-  }
-
-  // If roots have been unmounted, verify that they've been removed from maps.
-  // This helps ensure the Store doesn't leak memory.
-  store.assertExpectedRootMapSizes();
-
-  return snapshotLines.join('\n');
-}
+export { printStore };

packages/react-devtools-shared/src/backend/NativeStyleEditor/setupNativeStyleEditor.js

@@ -7,7 +7,7 @@ import type { BackendBridge } from 'react-devtools-shared/src/bridge';
 import type { RendererID } from '../types';
 import type { StyleAndLayout } from './types';
 
-export type ResolveNativeStyle = (stylesheetID: number) => ?Object;
+export type ResolveNativeStyle = (stylesheetID: any) => ?Object;
 
 export default function setupNativeStyleEditor(
   bridge: BackendBridge,
@@ -136,9 +136,8 @@ function measureStyle(
       );
       return;
     }
-    const margin = resolveBoxStyle('margin', resolvedStyle) || EMPTY_BOX_STYLE;
-    const padding =
-      resolveBoxStyle('padding', resolvedStyle) || EMPTY_BOX_STYLE;
+    const margin = resolvedStyle != null && resolveBoxStyle('margin', resolvedStyle) || EMPTY_BOX_STYLE;
+    const padding = resolvedStyle != null && resolveBoxStyle('padding', resolvedStyle) || EMPTY_BOX_STYLE;
     bridge.send(
       'NativeStyleEditor_styleAndLayout',
       ({