Hey 👋 For now you ll need to define

Hey! 👋 For now, you'll need to define your own ExecutionContext class:

class ExecutionContext {
  promises = [];
  waitUntil(promise) { this.promises.push(promise); }
  passThroughOnException() {}
}
...
const env = getMiniflareBindings();
const ctx = new ExecutionContext();
const response = await worker.fetch(request, env, ctx);
await Promise.all(ctx.promises);

class ExecutionContext {
  promises = [];
  waitUntil(promise) { this.promises.push(promise); }
  passThroughOnException() {}
}
...
const env = getMiniflareBindings();
const ctx = new ExecutionContext();
const response = await worker.fetch(request, env, ctx);
await Promise.all(ctx.promises);

A better solution is in the works though. 🙂

9 Replies

Ben Cox•2y ago

Hi there! Any progress on this? I've gotten pretty stuck trying to instantiate a Miniflare instance inside my Jest test using Module syntax but the only reason I need to is to pass a context to my handleRequest function.

Ben Cox•2y ago

@MrBBot Also, probably worth mentioning here: https://miniflare.dev/testing/jest - took me quite a while to find my way to these discord messages

🤹 Jest Environment · Miniflare

Fun, full-featured, fully-local simulator for Cloudflare Workers

Ben Cox•2y ago

Down at the bottom of the page it shows use of new ExecutionContext() but never mentions it's a roll-your-own situation.

MrBBotOP•2y ago

Hey! ExecutionContext should be provided as a global class as of Miniflare 2.8.0 (https://github.com/cloudflare/miniflare/releases/tag/v2.8.0).

Ben Cox•2y ago

@mrbbot Do I need to add it to globals or something? My setup is based on the miniflare-typescript-esbuild-jest repository here: https://github.com/cloudflare/miniflare-typescript-esbuild-jest. Here's what I'm seeing when I try to use the code from the Jest page (https://miniflare.dev/testing/jest) without building it by hand... seems to think it's just a typescript type.

🤹 Jest Environment · Miniflare

Fun, full-featured, fully-local simulator for Cloudflare Workers

Ben Cox•2y ago

Ben Cox•2y ago

Using 2.13.0

MrBBotOP•2y ago

Hmmm, that's a good point. You could try something like...

declare global {
  class ExecutionContext {
    waitUntil(promise: Promise<any>): void;
    passThroughOnException(): void;
  }
}

declare global {
  class ExecutionContext {
    waitUntil(promise: Promise<any>): void;
    passThroughOnException(): void;
  }
}

...though I suspect that will conflict with the @cloudflare/workers-types type. Let me know if that works, if not, you might just need to use a // @ts-expect-error comment. 😦 In any case, this is definitely something we should fix. 👍

Unknown User•11mo ago

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Hey 👋 For now you ll need to define