add back code that got lost
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@ -338,6 +338,9 @@ export function waitFor(filter: string | string[] | FilterFn, callback: Callback
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else if (typeof filter !== "function")
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throw new Error("filter must be a string, string[] or function, got " + typeof filter);
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const [existing, id] = find(filter!, { isIndirect: true, isWaitFor: true });
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if (existing) return void callback(existing, id);
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subscriptions.set(filter, callback);
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}
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