Cloudflare Developers•2mo ago

TypeScript error with global Response object

Hello! So I'm trying to build a Worker with TypeScript. I'm using the regular node-internal "fetch" which seems to return a "global.Response". When I try to make a function that takes that Response as parameter of type "Response", TS complains that

Argument of type 'global.Response' is not assignable to parameter of type 'Response'.
  Type 'Response' is missing the following properties from type 'Response': webSocket, cf, bytes

It seems there's a conflict between the Workers "Response" (https://developers.cloudflare.com/workers/runtime-apis/response/) and the integrated Response type. I cannot seem to use "global.Response" as an argument type, so does anyone know how to handle this conflict?

Cloudflare Docs

Response | Cloudflare Workers docs

Interface that represents an HTTP response.

7 Replies

Hard@Work•2mo ago

Assuming that the global.Response type is coming from Node, I would use

declare module "@types/node" {
    declare const value: unknown;
    export default value;
}

declare module "@types/node" {
    declare const value: unknown;
    export default value;
}

to get rid of it

Honumael (MasterQuestMaster)•2mo ago

Thanks, where would I put this?

Hard@Work•2mo ago

I usually put it in a .d.ts file in my types directory, which I include in typechecking with this in my tsconfig.json:

{
  // ...
  "include": ["src", "types"]
}

{
  // ...
  "include": ["src", "types"]
}

Honumael (MasterQuestMaster)•2mo ago

I tried to put it adjust my tsconfig to include "types" and put your code into "types/node.d.ts", but the error persists. The global.Response is what I get back when I: const response = await fetch("https://url") so it should be from node though.

Hard@Work•2mo ago

If you try to find the source of the Response type, where is it coming from?

Honumael (MasterQuestMaster)•2mo ago

wait a sec... it just started working with your solution. It seems it took a while to register the changes (even though I also restarted VS Code thinking that would update it). Thanks a lot for your help!

Hard@Work•2mo ago

Yeah, the typechecker works in mysterious ways...

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TypeScript error with global Response object