Remove flow (#3350)

* Remove flow types from src

* Finish removing Flow

* Clear out flow-typed, some flow mentions in docs, website flow usage, and some other config

src/NavigationActions.js

@@ -1,20 +1,3 @@
-/**
- * @flow
- */
-
-import type {
-  NavigationAction,
-  PossiblyDeprecatedNavigationAction,
-  DeprecatedNavigationNavigateAction,
-  NavigationInitAction,
-  NavigationNavigateAction,
-  NavigationBackAction,
-  NavigationSetParamsAction,
-  NavigationResetAction,
-  NavigationUriAction,
-  NavigationParams,
-} from './TypeDefinition';
-
 const BACK = 'Navigation/BACK';
 const INIT = 'Navigation/INIT';
 const NAVIGATE = 'Navigation/NAVIGATE';
@@ -22,87 +5,61 @@ const RESET = 'Navigation/RESET';
 const SET_PARAMS = 'Navigation/SET_PARAMS';
 const URI = 'Navigation/URI';
 
-const createAction = (type: string, fn: any) => {
+const createAction = (type, fn) => {
   fn.toString = () => type;
   return fn;
 };
 
-const back = createAction(
-  BACK,
-  (payload: { key?: ?string } = {}): NavigationBackAction => ({
-    type: BACK,
-    key: payload.key,
-  })
-);
-const init = createAction(
-  INIT,
-  (payload: { params?: NavigationParams } = {}): NavigationInitAction => {
-    const action: NavigationInitAction = {
-      type: INIT,
-    };
-    if (payload.params) {
-      action.params = payload.params;
-    }
-    return action;
-  }
-);
-const navigate = createAction(
-  NAVIGATE,
-  (payload: {
-    routeName: string,
-    params?: ?NavigationParams,
-    action?: ?NavigationNavigateAction,
-  }): NavigationNavigateAction => {
-    const action: NavigationNavigateAction = {
-      type: NAVIGATE,
-      routeName: payload.routeName,
-    };
-    if (payload.params) {
-      action.params = payload.params;
-    }
-    if (payload.action) {
-      action.action = payload.action;
-    }
-    return action;
-  }
-);
-const reset = createAction(
-  RESET,
-  (payload: {
-    index: number,
-    key?: ?string,
-    actions: Array<NavigationNavigateAction>,
-  }): NavigationResetAction => ({
-    type: RESET,
-    index: payload.index,
-    key: payload.key,
-    actions: payload.actions,
-  })
-);
-const setParams = createAction(
-  SET_PARAMS,
-  (payload: {
-    key: string,
-    params: NavigationParams,
-  }): NavigationSetParamsAction => ({
-    type: SET_PARAMS,
-    key: payload.key,
-    params: payload.params,
-  })
-);
-const uri = createAction(
-  URI,
-  (payload: { uri: string }): NavigationUriAction => ({
-    type: URI,
-    uri: payload.uri,
-  })
-);
+const back = createAction(BACK, (payload = {}) => ({
+  type: BACK,
+  key: payload.key,
+}));
 
-const mapDeprecatedNavigateAction = (
-  action: NavigationNavigateAction | DeprecatedNavigationNavigateAction
-): NavigationNavigateAction => {
+const init = createAction(INIT, (payload = {}) => {
+  const action = {
+    type: INIT,
+  };
+  if (payload.params) {
+    action.params = payload.params;
+  }
+  return action;
+});
+
+const navigate = createAction(NAVIGATE, payload => {
+  const action = {
+    type: NAVIGATE,
+    routeName: payload.routeName,
+  };
+  if (payload.params) {
+    action.params = payload.params;
+  }
+  if (payload.action) {
+    action.action = payload.action;
+  }
+  return action;
+});
+
+const reset = createAction(RESET, payload => ({
+  type: RESET,
+  index: payload.index,
+  key: payload.key,
+  actions: payload.actions,
+}));
+
+const setParams = createAction(SET_PARAMS, payload => ({
+  type: SET_PARAMS,
+  key: payload.key,
+  params: payload.params,
+}));
+
+const uri = createAction(URI, payload => ({
+  type: URI,
+  uri: payload.uri,
+}));
+
+const mapDeprecatedNavigateAction = action => {
   if (action.type === 'Navigate') {
-    const payload: Object = {
+    const payload = {
       routeName: action.routeName,
       params: action.params,
     };
@@ -114,9 +71,7 @@ const mapDeprecatedNavigateAction = (
   return action;
 };
 
-const mapDeprecatedAction = (
-  action: PossiblyDeprecatedNavigationAction
-): NavigationAction => {
+const mapDeprecatedAction = action => {
   if (action.type === 'Back') {
     return back(action);
   } else if (action.type === 'Init') {
@@ -135,9 +90,7 @@ const mapDeprecatedAction = (
   return action;
 };
 
-const mapDeprecatedActionAndWarn = (
-  action: PossiblyDeprecatedNavigationAction
-): NavigationAction => {
+const mapDeprecatedActionAndWarn = action => {
   const newAction = mapDeprecatedAction(action);
   if (newAction !== action) {
     const oldType = action.type;