unbiased dice roll in browser

cryptorange.js

function getCryptoRange(min, max) {
    const range = max - min + 1
    const mBits = Math.ceil(Math.log2(range))
    const mBytes = Math.ceil(mBits / 8)
    const nAllowed = Math.floor((256 ** mBytes) / range) * range
    const arBytes = new Uint8Array(mBytes)
    let value
    do {
        crypto.getRandomValues(arBytes)
        value = arBytes.reduce((acc, x, n) => acc + x * 256 ** n, 0)
    } while (value >= nAllowed)
    return min + value % range
}

console.log( getCryptoRange( 1, 6 ))