Add annotations to break type cycles in www root

Summary:
Faecbook:

Add explicit annotations to break type cycles as required for Flow's Local Type Inference project. This codemod prepares the codebase to match Flow's new typechecking algorithm. The new algorithm will make Flow more reliable and predictable.

Details:
- Codemod script: `./scripts/typedjs/flow/runner lti/annotate_cycles .`
- Local Type Inference announcement: [post](https://fb.workplace.com/groups/flowlang/posts/788206301785035)
- Support group: [Flow Support](https://fb.workplace.com/groups/flow)

Codemodded paths:
- ``

drop-conflicts
bypass-lint

Reviewed By: jbrown215

Differential Revision: D41980338

fbshipit-source-id: b4101ac694cdac606344c9054a13b97eca1c73cf

src/component/handlers/composition/__tests__/DraftEditorCompostionHandler-test.js

@@ -11,9 +11,7 @@
 
 'use strict';
 
-// DraftEditorComposition uses timers to detect duplicate `compositionend`
-// events.
-jest.useFakeTimers();
+import type DraftEditor from 'DraftEditor.react';
 
 const ContentBlock = require('ContentBlock');
 const ContentState = require('ContentState');
@@ -24,6 +22,10 @@ const convertFromHTMLToContentBlocks = require('convertFromHTMLToContentBlocks')
 const editOnCompositionStart = require('editOnCompositionStart');
 const {Map} = require('immutable');
 
+// DraftEditorComposition uses timers to detect duplicate `compositionend`
+// events.
+jest.useFakeTimers();
+
 jest.mock('DOMObserver', () => {
   function DOMObserver() {}
   // $FlowFixMe[prop-missing]
@@ -48,7 +50,15 @@ jest.mock('getDraftEditorSelection', () => {
 // the module in a bad state we forcibly reload it each test.
 let compositionHandler = null;
 // Initialization of mock editor component that will be used for all tests
-let editor;
+let editor: {
+  _latestEditorState: EditorState,
+  _onCompositionStart: (editor: DraftEditor) => void,
+  _onKeyDown: JestMockFn<$FlowFixMe, $FlowFixMe>,
+  exitCurrentMode: JestMockFn<$FlowFixMe, $FlowFixMe>,
+  restoreEditorDOM: JestMockFn<$FlowFixMe, $FlowFixMe>,
+  setMode: JestMockFn<$FlowFixMe, $FlowFixMe>,
+  update: JestMockFn<$FlowFixMe, $FlowFixMe>,
+};
 
 function getEditorState(
   blocks: