Singleton

type Admission = { allowed: boolean; remaining: number };
type Budget = { tryTake(): Admission };

// A budget of attempts, spent one at a time.
function createBudget(limit: number): Budget {
  let remaining = limit;
  return {
    tryTake() {
      const allowed = remaining > 0;
      if (allowed) remaining -= 1;
      return { allowed, remaining };
    },
  };
}

// The access point: created on the first call, returned ever after.
let appBudget: Budget | undefined;
function getAppBudget(): Budget {
  appBudget ??= createBudget(3);
  return appBudget;
}

// Two callers, one allowance: each asks the access point.
function search(): Admission {
  const budget = getAppBudget();
  return budget.tryTake();
}
function exportResults(): Admission {
  const budget = getAppBudget();
  return budget.tryTake();
}

const first = search();
const second = search();
const third = exportResults();
const fourth = exportResults();

const show = (name: string, a: Admission) =>
  console.log(`${name}: allowed=${a.allowed} remaining=${a.remaining}`);
show('search', first);
show('search', second);
show('export', third);
show('export', fourth);