Isolated DB throws this error TypeError: The "eventTargets" argument must be an instance of EventEmitter or EventTarget. Received an instance of AbortSignal with npx vitest #39
Description
npx vitest throws the following error "TypeError: The "eventTargets" argument must be an instance of EventEmitter or EventTarget. Received an instance of AbortSignal" with Isolated DB for testing.
A little bit of google searching landed me here, which is the root cause of the problem. You can check out the link for more context. Apparently, execa version 9 which is the current version of the package in the project relies on setMaxListeners export from node:events which throws error in jsdom environment because the AbortSignal from jsdom's AbortController is not node.js EventTarget.
I'm not exactly sure the best way to fix this problem. Of course, one option would be to downgrade execa to version 8 but not sure if that's a good idea based on this comment. However, I added this hack in the db-setup.ts file and it does work for me:
const kEventTarget = Symbol.for('nodejs.event_target') // https://github.com/nodejs/node/blob/68c9f554ffa2fab1ef3b6466c51491371f0dd158/lib/internal/event_target.js#L50
if (globalThis.window !== undefined) {
const JSDOMAbortController = window.AbortController
window.AbortController = class extends JSDOMAbortController {
get signal() {
const signal = super.signal
if ('constructor' in signal) {
// @ts-expect-error
signal.constructor[kEventTarget] = true //
} else {
// @ts-expect-error
signal.constructor = { [kEventTarget]: true } //https://github.com/nodejs/node/blob/68c9f554ffa2fab1ef3b6466c51491371f0dd158/lib/internal/event_target.js#L1070
}
return signal
}
}
}