Typeerror: Cannot Mix Bigint And Other Types, Use Explicit Conversions

I am trying to generate a 20 digit random number: let code = Math.floor(10000000000000000000n + Math.random() * 90000000000000000000n) I have tried putting the numbers in BigInt()

Solution 1:

// An operation with a fractional result will be truncated when used with a BigInt.

const rounded = 5n / 2n
// ↪ 2n, not 2.5n

// BigInt value can only operator with same type

// random BigInt
BigInt(Math.floor(Math.random() * 10))

// generate a 20 digit random number
BigInt(Math.floor(Math.random() * 100000000000000000000))

you can check this