[types] Get flow type working again; Fix majority of firestore type issues

lib/utils/SyncTree.js

@@ -1,3 +1,6 @@
+/**
+ * @flow
+ */
 import { NativeEventEmitter } from 'react-native';
 
 import INTERNALS from './../internals';
@@ -6,13 +9,13 @@ import DatabaseReference from './../modules/database/reference';
 import { isString, nativeToJSError } from './../utils';
 
 type Registration = {
-  key: String,
-  path: String,
-  once?: Boolean,
-  appName: String,
-  eventType: String,
+  key: string,
+  path: string,
+  once?: boolean,
+  appName: string,
+  eventType: string,
   listener: Function,
-  eventRegistrationKey: String,
+  eventRegistrationKey: string,
   ref: DatabaseReference,
 }
 
@@ -21,7 +24,12 @@ type Registration = {
  * subscriptions and keep the listeners in sync in js vs native.
  */
 export default class SyncTree {
-  constructor(databaseNative) {
+  _databaseNative: Object;
+  _nativeEmitter: NativeEventEmitter;
+  _reverseLookup: { [string]: Registration };
+  _tree: { [string]: { [string]: Array }};
+
+  constructor(databaseNative: Object) {
     this._tree = {};
     this._reverseLookup = {};
     this._databaseNative = databaseNative;
@@ -110,7 +118,7 @@ export default class SyncTree {
    * @param registration
    * @return {null}
    */
-  getRegistration(registration): Registration | null {
+  getRegistration(registration: string): Registration | null {
     return this._reverseLookup[registration] ? Object.assign({}, this._reverseLookup[registration]) : null;
   }
 
@@ -120,7 +128,7 @@ export default class SyncTree {
    * @param registrations
    * @return {number}
    */
-  removeListenersForRegistrations(registrations) {
+  removeListenersForRegistrations(registrations: string | string[]) {
     if (isString(registrations)) {
       this.removeRegistration(registrations);
       INTERNALS.SharedEventEmitter.removeAllListeners(registrations);
@@ -143,7 +151,7 @@ export default class SyncTree {
    * @param registrations
    * @return {Array} array of registrations removed
    */
-  removeListenerRegistrations(listener, registrations) {
+  removeListenerRegistrations(listener, registrations: string[]) {
     if (!Array.isArray(registrations)) return [];
     const removed = [];
 
@@ -173,7 +181,7 @@ export default class SyncTree {
    * @param path
    * @return {Array}
    */
-  getRegistrationsByPath(path): Array {
+  getRegistrationsByPath(path: string): Array {
     const out = [];
     const eventKeys = Object.keys(this._tree[path] || {});
 
@@ -191,7 +199,7 @@ export default class SyncTree {
    * @param eventType
    * @return {Array}
    */
-  getRegistrationsByPathEvent(path, eventType): Array {
+  getRegistrationsByPathEvent(path: string, eventType: string): Array {
     if (!this._tree[path]) return [];
     if (!this._tree[path][eventType]) return [];
 
@@ -228,8 +236,13 @@ export default class SyncTree {
    * @param listener
    * @return {String}
    */
-  addRegistration(parameters: Registration, listener): String {
-    const { path, eventType, eventRegistrationKey, once } = parameters;
+  addRegistration(parameters: Registration, listener: Function): string {
+    const {
+      path,
+      eventType,
+      eventRegistrationKey,
+      once,
+    } = parameters;
 
     if (!this._tree[path]) this._tree[path] = {};
     if (!this._tree[path][eventType]) this._tree[path][eventType] = {};
@@ -256,7 +269,7 @@ export default class SyncTree {
    * @param registration
    * @return {boolean}
    */
-  removeRegistration(registration: String): Boolean {
+  removeRegistration(registration: string): boolean {
     if (!this._reverseLookup[registration]) return false;
     const { path, eventType, once } = this._reverseLookup[registration];
 
@@ -298,4 +311,3 @@ export default class SyncTree {
     };
   }
 }
-