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export default MinStack;type MinStack = ReturnType<typeof MinStack>;function MinStack() {    const stack = [] as [number, number][];    return {        push(x: number): void {            stack.push([x, Math.min(x, stack.at(-1)?.[1] ?? Infinity)]);        },        pop(): void {            stack.pop();        },        top(): number {            const res = stack.at(-1)?.[0];            if (typeof res === "undefined") throw Error("empty stack");            return res;        },        getMin(): number {            const res = stack.at(-1)?.[1];            if (typeof res === "undefined") throw Error("empty stack");            return res;        },    };}