范围错误：BigInt 负指数
当 BigInt 为负 BigInt 值的幂时，会发生 JavaScript 异常 "BigInt 负指数"。
¥The JavaScript exception "BigInt negative exponent" occurs when a BigInt is raised to the power of a negative BigInt value.
信息
错误类型
什么地方出了错？
¥What went wrong?
exponentiation 运算的指数必须为正。由于负指数取底数的倒数，因此几乎在所有情况下结果都在 -1 和 1 之间，四舍五入为 0n。为了发现错误，不允许使用负指数。在求幂之前检查指数是否非负。
¥The exponent of an exponentiation operation must be positive. Since negative exponents would take the reciprocal of the base, the result will be between -1 and 1 in almost all cases, which gets rounded to 0n. To catch mistakes, negative exponents are not allowed. Check if the exponent is non-negative before doing exponentiation.
示例
使用负 BigInt 作为指数
¥Using a negative BigInt as exponent
const a = 1n;
const b = -1n;
const c = a ** b;
// RangeError: BigInt negative exponent
相反，首先检查指数是否为负数，然后发出带有更好消息的错误，或者回退到不同的值，例如 0n 或 undefined。
¥Instead, check if the exponent is negative first, and either issue an error with a better message, or fallback to a different value, like 0n or undefined.
const a = 1n;
const b = -1n;
const quotient = b >= 0n ? a ** b : 0n;