fix lint issues

Author: coado

packages/react-native/scripts/ios-prebuild/hermes.js

@@ -19,7 +19,7 @@ const pipeline = promisify(stream.pipeline);
 const hermesLog = createLogger('Hermes');
 const MAVEN_CENTRAL_REPOSITORY = 'https://repo1.maven.org/maven2';
 const REACT_NATIVE_MAVEN_CACHE_REPOSITORY = 'https://rnmaven.swmtest.xyz';
-const artifactExistenceCache = new Map();
+const artifactExistenceCache /*: Map<string, boolean> */ = new Map();
 
 /*::
 import type {BuildFlavor, Destination, Platform} from './types';
@@ -243,8 +243,9 @@ function getMavenRepositoryUrls() /*: Array<string> */ {
 async function hermesArtifactExists(
   tarballUrl /*: string */,
 ) /*: Promise<boolean> */ {
-  if (artifactExistenceCache.has(tarballUrl)) {
-    return artifactExistenceCache.get(tarballUrl);
+  const cached = artifactExistenceCache.get(tarballUrl);
+  if (cached != null) {
+    return cached;
   }
 
   try {

packages/react-native/scripts/ios-prebuild/reactNativeDependencies.js

@@ -22,7 +22,7 @@ const pipeline = promisify(stream.pipeline);
 const dependencyLog = createLogger('ReactNativeDependencies');
 const MAVEN_CENTRAL_REPOSITORY = 'https://repo1.maven.org/maven2';
 const REACT_NATIVE_MAVEN_CACHE_REPOSITORY = 'https://rnmaven.swmtest.xyz';
-const artifactExistenceCache = new Map();
+const artifactExistenceCache /*: Map<string, boolean> */ = new Map();
 
 /**
  * Downloads ReactNativeDependencies artifacts from the specified version and build type. If you want to specify a specific
@@ -250,8 +250,9 @@ async function getNightlyTarballUrl(
 async function reactNativeDependenciesArtifactExists(
   tarballUrl /*: string */,
 ) /*: Promise<boolean> */ {
-  if (artifactExistenceCache.has(tarballUrl)) {
-    return artifactExistenceCache.get(tarballUrl);
+  const cached = artifactExistenceCache.get(tarballUrl);
+  if (cached != null) {
+    return cached;
   }
 
   try {