The published types reference src/types/globals.d.ts, whose globals conflict with TypeScript's DOM library under skipLibCheck: false #59649

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1. Rishabhmk25 commented on Oct 30, 2026

   

   Rishabhmk25

   on Oct 30, 2026

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   Hey, I'd like to pick this up.

   I reproduced the 69 errors. The cause is the /// to globals.d.ts at the top of index.d.ts (it gets copied from index.js.flow). Taking that line out fixes the DOM case, but apps without the DOM lib would lose fetch, URL, timers, etc.

   I tried keeping the globals behind a react-native-globals export condition that @react-native/typescript-config turns on. With that, the DOM project goes from 72 errors to 3 (the 3 are #59647), and apps on the updated config are unchanged. The downside is that apps with their own tsconfig, or ones that upgrade react-native without the config, would lose the globals, so it's a breaking change.

   Does that trade-off work for you, or would you rather I rework globals.d.ts so it merges with lib.dom instead? I can open a PR either way.
2. YevheniiKotyrlo commented on Oct 30, 2026

   

   YevheniiKotyrlo

   on Oct 30, 2026

   ContributorAuthor

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   This is the patch I apply to the published 0.88.0 package until a fix lands: index.d.ts references a globals file that declares only what no TypeScript library declares, so the DOM library, @types/node and bun-types keep their own fetch, URL, Blob and timers.

   diff --git a/types_generated/index.d.ts b/types_generated/index.d.ts
   --- a/types_generated/index.d.ts
   +++ b/types_generated/index.d.ts
   @@ -10,7 +10,7 @@
     * Original file: packages/react-native/index.js.flow
     */
    
   -/// <reference path="../src/types/globals.d.ts" />
   +/// <reference path="react-native-globals.d.ts" />
    
    
    export type { ActivityIndicatorInstance, ActivityIndicatorProps } from "./Libraries/Components/ActivityIndicator/ActivityIndicator";
   diff --git a/types_generated/react-native-globals.d.ts b/types_generated/react-native-globals.d.ts
   new file mode 100644
   --- /dev/null
   +++ b/types_generated/react-native-globals.d.ts
   @@ -0,0 +1,20 @@
   +/**
   + * The globals React Native's runtime adds to the JavaScript environment and no
   + * TypeScript library declares. src/types/globals.d.ts also redeclares fetch,
   + * XMLHttpRequest, URL, WebSocket, Blob, FileReader, AbortController and the
   + * timers, which conflict with lib.dom.d.ts, @types/node and bun-types.
   + */
   +
   +import type { ErrorUtils } from "./Libraries/vendor/core/ErrorUtils";
   +
   +declare global {
   +  const originalXMLHttpRequest: unknown;
   +  const __BUNDLE_START_TIME__: number;
   +  const ErrorUtils: ErrorUtils;
   +  const __DEV__: boolean;
   +  const HermesInternal: null | {};
   +  function clearImmediate(handle: number | null | undefined): void;
   +  function setImmediate(handler: () => void): number;
   +  function setImmediate<Args extends unknown[]>(handler: (...args: Args) => void, ...args: Args): number;
   +  function fetchBundle(bundleId: number, callback: (error?: Error | null) => void): void;
   +}