TypeError: Cannot mix BigInt and other types, use explicit conversions

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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() as well as adding a n after but still this error comes.

Uncaught TypeError: Cannot mix BigInt and other types, use explicit conversions
ecmascript-2016 random javascript
1 Answers
// 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

user_53053240
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