Add LTI annotations to function params in xplat/js [2/2]

Summary: Add annotations to function parameters 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 predicatable.

Reviewed By: evanyeung

Differential Revision: D37360113

fbshipit-source-id: 870bcfe680542b3861fefbaf372db0ae8b32cbf3

Libraries/Image/AssetSourceResolver.js

@@ -35,7 +35,7 @@ const {
 /**
  * Returns a path like 'assets/AwesomeModule/icon@2x.png'
  */
-function getScaledAssetPath(asset): string {
+function getScaledAssetPath(asset: PackagerAsset): string {
   const scale = pickScale(asset.scales, PixelRatio.get());
   const scaleSuffix = scale === 1 ? '' : '@' + scale + 'x';
   const assetDir = getBasePath(asset);
@@ -45,7 +45,7 @@ function getScaledAssetPath(asset): string {
 /**
  * Returns a path like 'drawable-mdpi/icon.png'
  */
-function getAssetPathInDrawableFolder(asset): string {
+function getAssetPathInDrawableFolder(asset: PackagerAsset): string {
   const scale = pickScale(asset.scales, PixelRatio.get());
   const drawbleFolder = getAndroidResourceFolderName(asset, scale);
   const fileName = getAndroidResourceIdentifier(asset);

packages/react-native-codegen/src/generators/components/GenerateViewConfigJs.js

@@ -9,6 +9,11 @@
  */
 
 'use strict';
+import type {
+  PropTypeAnnotation,
+  EventTypeShape,
+  ComponentShape,
+} from '../../CodegenSchema';
 
 const j = require('jscodeshift');
 
@@ -46,7 +51,7 @@ ${componentConfig}
 // this multiple times.
 const UIMANAGER_IMPORT = 'const {UIManager} = require("react-native")';
 
-function getReactDiffProcessValue(typeAnnotation) {
+function getReactDiffProcessValue(typeAnnotation: PropTypeAnnotation) {
   switch (typeAnnotation.type) {
     case 'BooleanTypeAnnotation':
     case 'StringTypeAnnotation':
@@ -151,7 +156,7 @@ if (UIManager.hasViewManagerConfig('${componentName}')) {
 `.trim();
 
 // Replicates the behavior of RCTNormalizeInputEventName in RCTEventDispatcher.m
-function normalizeInputEventName(name) {
+function normalizeInputEventName(name: string) {
   if (name.startsWith('on')) {
     return name.replace(/^on/, 'top');
   } else if (!name.startsWith('top')) {
@@ -162,7 +167,10 @@ function normalizeInputEventName(name) {
 }
 
 // Replicates the behavior of viewConfig in RCTComponentData.m
-function getValidAttributesForEvents(events, imports) {
+function getValidAttributesForEvents(
+  events: $ReadOnlyArray<EventTypeShape>,
+  imports: Set<string>,
+) {
   imports.add(
     "const {ConditionallyIgnoredEventHandlers} = require('react-native/Libraries/NativeComponent/ViewConfigIgnore');",
   );
@@ -178,7 +186,10 @@ function getValidAttributesForEvents(events, imports) {
   ]);
 }
 
-function generateBubblingEventInfo(event, nameOveride) {
+function generateBubblingEventInfo(
+  event: EventTypeShape,
+  nameOveride: void | string,
+) {
   return j.property(
     'init',
     j.identifier(nameOveride || normalizeInputEventName(event.name)),
@@ -199,7 +210,10 @@ function generateBubblingEventInfo(event, nameOveride) {
   );
 }
 
-function generateDirectEventInfo(event, nameOveride) {
+function generateDirectEventInfo(
+  event: EventTypeShape,
+  nameOveride: void | string,
+) {
   return j.property(
     'init',
     j.identifier(nameOveride || normalizeInputEventName(event.name)),
@@ -216,8 +230,8 @@ function generateDirectEventInfo(event, nameOveride) {
 function buildViewConfig(
   schema: SchemaType,
   componentName: string,
-  component,
-  imports,
+  component: ComponentShape,
+  imports: Set<string>,
 ) {
   const componentProps = component.props;
   const componentEvents = component.events;
@@ -326,8 +340,8 @@ function buildViewConfig(
 function buildCommands(
   schema: SchemaType,
   componentName: string,
-  component,
-  imports,
+  component: ComponentShape,
+  imports: Set<string>,
 ) {
   const commands = component.commands;