Function safeCompare

index.js:7–17

(userInput, secret)

// Credits for the actual algorithm go to github/@Bruce17
// Thanks to github/@hraban for making me implement this
function safeCompare(userInput, secret) {
    const userInputLength = Buffer.byteLength(userInput)
    const secretLength = Buffer.byteLength(secret)

    const userInputBuffer = Buffer.alloc(userInputLength, 0, 'utf8')
    userInputBuffer.write(userInput)
    const secretBuffer = Buffer.alloc(userInputLength, 0, 'utf8')
    secretBuffer.write(secret)

    return !!(timingSafeEqual(userInputBuffer, secretBuffer) & userInputLength === secretLength)
}

function ensureFunction(option, defaultValue) {
    if(option == undefined)