BigInt.prototype.toLocaleString()

const bigint = 123456789123456789n;

// 
console.log(bigint.toLocaleString("de-DE"));
// : "123.456.789.123.456.789"

// 
console.log(
  bigint.toLocaleString("de-DE", { style: "currency", currency: "EUR" }),
);
// : "123.456.789.123.456.789,00 "

toLocaleString()
toLocaleString(locales)
toLocaleString(locales, options)

const bigint = 3500n;

console.log(bigint.toLocaleString());
// "3,500"  (U.S. English )

function toLocaleStringSupportsLocales() {
  return (
    typeof Intl === "object" &&
    !!Intl &&
    typeof Intl.NumberFormat === "function"
  );
}

const bigint = 123456789123456789n;

// 
console.log(bigint.toLocaleString("de-DE"));
// 123.456.789.123.456.789

// 
console.log(bigint.toLocaleString("ar-EG"));
// 

// //
console.log(bigint.toLocaleString("en-IN"));
// 1,23,45,67,89,12,34,56,789

// nu 
console.log(bigint.toLocaleString("zh-Hans-CN-u-nu-hanidec"));
//  ,,,,,

// 
// 
console.log(bigint.toLocaleString(["ban", "id"]));
//  123.456.789.123.456.789

const bigint = 123456789123456789n;

// 
console.log(
  bigint.toLocaleString("de-DE", { style: "currency", currency: "EUR" }),
);
// 123.456.789.123.456.789,00 

// 
console.log(
  bigint.toLocaleString("ja-JP", { style: "currency", currency: "JPY" }),
);
// 123,456,789,123,456,789

//  3 
console.log(bigint.toLocaleString("en-IN", { maximumSignificantDigits: 3 }));
// 1,23,00,00,00,00,00,00,000