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export interface RequestGuard {
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  isCurrent(): boolean;
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  cancel(): void;
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}
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export function createRequestGuard(epochRef: { current: number }, activeRef: { current: boolean }): RequestGuard {
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  const epoch = ++epochRef.current;
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  let cancelled = false;
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  return {
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    isCurrent() {
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      return !cancelled && activeRef.current && epoch === epochRef.current;
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    },
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    cancel() {
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      cancelled = true;
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    },
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  };
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}