Fixes flow

closes #275

.flowconfig

 [ignore]
-
-# We fork some components by platform.
-.*/*[.]android.js
-
-# Ignore templates with `@flow` in header
-.*/local-cli/generator.*
-
-# Ignore malformed json
-.*/node_modules/y18n/test/.*\.json
-
-# Ignore unexpected extra @providesModule
-.*/node_modules/commoner/test/source/widget/share.js
-
-# Ignore duplicate module providers
-# For RN Apps installed via npm, "Libraries" folder is inside node_modules/react-native but in the source repo it is in the root
-.*/Libraries/react-native/React.js
-.*/Libraries/react-native/ReactNative.js
-.*/node_modules/jest-runtime/build/__tests__/.*
+<PROJECT_ROOT>/example/
 
 [include]
 
 [libs]
-node_modules/react-native/Libraries/react-native/react-native-interface.js
 node_modules/react-native/flow
-flow/
-
-[options]
-module.system=haste
-
-esproposal.class_static_fields=enable
-esproposal.class_instance_fields=enable
-
-experimental.strict_type_args=true
-
-munge_underscores=true
-
-module.name_mapper='^image![a-zA-Z0-9$_-]+$' -> 'GlobalImageStub'
-module.name_mapper='^[./a-zA-Z0-9$_-]+\.\(bmp\|gif\|jpg\|jpeg\|png\|psd\|svg\|webp\|m4v\|mov\|mp4\|mpeg\|mpg\|webm\|aac\|aiff\|caf\|m4a\|mp3\|wav\|html\|pdf\)$' -> 'RelativeImageStub'
+node_modules/react-native/Libraries/react-native/react-native-interface.js
 
-suppress_type=$FlowIssue
-suppress_type=$FlowFixMe
-suppress_type=$FixMe
+[lints]
 
-suppress_comment=\\(.\\|\n\\)*\\$FlowFixMe\\($\\|[^(]\\|(\\(>=0\\.\\(3[0-2]\\|[1-2][0-9]\\|[0-9]\\).[0-9]\\)? *\\(site=[a-z,_]*react_native[a-z,_]*\\)?)\\)
-suppress_comment=\\(.\\|\n\\)*\\$FlowIssue\\((\\(>=0\\.\\(3[0-2]\\|1[0-9]\\|[1-2][0-9]\\).[0-9]\\)? *\\(site=[a-z,_]*react_native[a-z,_]*\\)?)\\)?:? #[0-9]+
-suppress_comment=\\(.\\|\n\\)*\\$FlowFixedInNextDeploy
+[options]
 
-unsafe.enable_getters_and_setters=true
+[strict]

example/package.json

     "lint": "eslint ."
   },
   "dependencies": {
-    "@react-native-community/art": "^1.0.1",
-    "@react-native-community/slider": "^2.0.0",
+    "@react-native-community/art": "^1.1.2",
+    "@react-native-community/slider": "^2.0.8",
     "gl-react": "2",
     "gl-react-native": "2",
     "lodash": "^4.17.15",
-    "react": "16.8.6",
-    "react-native": "0.60.4",
-    "react-native-canvas": "^0.1.33",
-    "react-native-fs": "^2.14.1",
-    "react-native-gesture-handler": "^1.3.0",
-    "react-native-maps": "^0.25.0",
-    "react-native-reanimated": "^1.2.0",
-    "react-native-svg": "^9.6.2",
+    "react": "16.12.0",
+    "react-native": "0.61.5",
+    "react-native-canvas": "^0.1.36",
+    "react-native-fs": "^2.16.2",
+    "react-native-gesture-handler": "^1.5.3",
+    "react-native-maps": "^0.26.1",
+    "react-native-reanimated": "^1.7.0",
+    "react-native-svg": "^11.0.1",
     "react-native-svg-uri": "^1.2.3",
-    "react-native-video": "^5.0.0",
+    "react-native-video": "^5.0.2",
     "react-native-view-shot": "^3.0.2",
-    "react-native-webview": "^6.9.0",
-    "react-navigation": "^3.11.1"
+    "react-native-webview": "^8.0.3",
+    "react-navigation": "^4.0.10"
   },
   "devDependencies": {
-    "@babel/core": "^7.5.5",
-    "@babel/runtime": "^7.5.5",
-    "@react-native-community/eslint-config": "^0.0.5",
-    "eslint": "^6.1.0",
+    "@babel/core": "^7.8.3",
+    "@babel/runtime": "^7.8.3",
+    "@react-native-community/eslint-config": "^0.0.6",
+    "eslint": "^6.8.0",
     "flow-bin": "0.98.0",
-    "metro-react-native-babel-preset": "^0.55.0",
-    "react-test-renderer": "16.8.6"
+    "metro-react-native-babel-preset": "^0.56.4",
+    "react-test-renderer": "16.12.0"
   }
 }

package.json

   "peerDependencies": {
     "react": "*",
     "react-native": "*"
+  },
+  "devDependencies": {
+    "flow-bin": "^0.116.1",
+    "react": "^16.12.0",
+    "react-native": "^0.61.5"
   }
 }

src/index.js

-//@flow
+// @flow
 import React, { Component } from "react";
 import { View, NativeModules, Platform, findNodeHandle } from "react-native";
 const { RNViewShot } = NativeModules;
 
 import type { Element, ElementRef, ElementType, Ref } from "react";
-import type { ViewStyleProp } from "StyleSheet";
-import type { LayoutEvent } from "CoreEventTypes";
+import type { ViewStyleProp } from "react-native/Libraries/StyleSheet/StyleSheet";
+import type { LayoutEvent } from "react-native/Libraries/Types/CoreEventTypes";
 
 const neverEndingPromise = new Promise(() => {});
 
 
 // validate and coerce options
 function validateOptions(
-  options: ?Object
+  input: ?$Shape<Options>
 ): { options: Options, errors: Array<string> } {
-  options = {
+  const options: Options = {
     ...defaultOptions,
-    ...options
+    ...input
   };
   const errors = [];
   if (
 }
 
 export function captureRef<T: ElementType>(
-  view: number | ?View | Ref<T>,
+  input: number | ?View | Ref<T>,
   optionsObject?: Object
 ): Promise<string> {
   ensureModuleIsLoaded();
-  if (view && typeof view === "object" && "current" in view && view.current) {
-    // React.RefObject
-    view = view.current;
+  let view;
+  if (input && typeof input === "object" && "current" in input) {
+    // $FlowFixMe input is a ref
+    view = input.current;
     if (!view) {
       return Promise.reject(new Error("ref.current is null"));
     }
   }
-  if (typeof view !== "number") {
-    const node = findNodeHandle(view);
+  if (typeof input !== "number") {
+    const node = findNodeHandle(input);
     if (!node) {
       return Promise.reject(
-        new Error("findNodeHandle failed to resolve view=" + String(view))
+        new Error("findNodeHandle failed to resolve view=" + String(input))
       );
     }
     view = node;
         errors.map(e => `- ${e}`).join("\n")
     );
   }
-  return RNViewShot.captureRef(view, options);
+  return RNViewShot.captureRef(input, options);
 }
 
 export function releaseCapture(uri: string): void {
 export default class ViewShot extends Component<Props> {
   static captureRef = captureRef;
   static releaseCapture = releaseCapture;
-  constructor(props) {
-    super(props);
-    this.state = {};
-  }
+
   root: ?View;
 
   _raf: *;
   lastCapturedURI: ?string;
 
   resolveFirstLayout: (layout: Object) => void;
-  firstLayoutPromise = new Promise(resolve => {
+  firstLayoutPromise: Promise<Object> = new Promise(resolve => {
     this.resolveFirstLayout = resolve;
   });
 
     }
   }
 
-  componentDidUpdate(prevProps) {
+  componentDidUpdate(prevProps: Props) {
     if (this.props.captureMode !== undefined) {
       if (this.props.captureMode !== prevProps.captureMode) {
         this.syncCaptureLoop(this.props.captureMode);