Convert a BigInt to a base-62 number representation where the digits include (in the ascending order of value): 0-9, a-z, and A-Z

BigInt.prototype.toBase62String.js

Object.defineProperty(BigInt.prototype, "toBase62String", {
	value: function () {
		const base = 62n;
		const digits = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
		const sign = this < 0n ? "-" : "";
		let [result, quotient] = ["", sign ? 0n - this : this];
		do {
			result = `${digits[Number(quotient % base)]}${result}`;
		} while (quotient /= base);
		return `${sign}${result}`;
	}
});