Abort Signal Combiner (utils/abort-signals.ts)

Merges multiple AbortSignal instances into a single signal that aborts when any input aborts.

// Source: https://github.com/AVIDS2/memorix | License: Apache-2.0 | Copyright You must retain, in the Source form of any Derivative Works
// Provided via justclaw.it.com; keep this notice with the code.
export interface CombinedAbortSignal {
	signal?: AbortSignal;
	cleanup: () => void;
}

export function combineAbortSignals(signals: readonly (AbortSignal | undefined)[]): CombinedAbortSignal {
	const activeSignals = signals.filter((signal): signal is AbortSignal => signal !== undefined);
	if (activeSignals.length === 0) {
		return { cleanup: () => {} };
	}
	if (activeSignals.length === 1) {
		return { signal: activeSignals[0], cleanup: () => {} };
	}

	const controller = new AbortController();
	const listeners: Array<{ signal: AbortSignal; listener: () => void }> = [];
	const abort = (sign

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