José Almeida
20 lines
621 B
TypeScript
20 lines
621 B
TypeScript
export function resolveRemainingThreadId(
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previous: readonly string[],
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next: readonly string[],
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current: string | null,
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): string | null {
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const remaining = new Set(next);
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if (current && remaining.has(current)) return current;
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const index = current ? previous.indexOf(current) : -1;
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if (index !== -1) {
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const successor = previous.slice(index + 1).find((id) => remaining.has(id));
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if (successor) return successor;
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const predecessor = previous
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.slice(0, index)
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.reverse()
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.find((id) => remaining.has(id));
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if (predecessor) return predecessor;
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}
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return next[0] ?? null;
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}
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