Increment alphanumeric sequence in JavaScript

increment-alphanumeric.js

const A = 65
const Z = 90
const ZERO = 48
const NINE = 57

const isDigit = (char) => char >= 48 && char <= 57

const codeToChar = (code) => String.fromCharCode(code)
const setChar = (index, char, str) => {
    const charArr = [...str]
    charArr.splice(index, 1, char)
    return charArr.join('')
}

const incDigit = (char) => char + 1 > NINE ? ZERO : char + 1
const incLetter = (char) => char + 1 > Z ? A : char + 1

const increment = (str, place = str.length - 1) => {
    if (place < 0) return str;

    const char = str.charCodeAt(place)

    const nextChar = isDigit(char) ? incDigit(char) : incLetter(char)

    const carry = nextChar - char !== 1;

    str = setChar(place, codeToChar(nextChar), str)

    if (carry)
        return increment(str, --place)
    else return str
}

export const incrementAlphanumeric = (str) => increment(str)

Well not exactly, but I figued out how to do it

const A = 65
const Z = 90
const ZERO = 48
const NINE = 57

const isDigit = (char) => char >= 48 && char <= 57

const codeToChar = (code) => String.fromCharCode(code)
const setChar = (index, char, str) => {
    const charArr = [...str]
    charArr.splice(index, 1, char)
    return charArr.join('')
}

const areAllNine = (str) => {
    return str.split("").filter((char) => char.charCodeAt(0) === NINE).length === str.split("").length;
};

const areAllNineAndZ = (str) => {
    return str.split("").filter((char) => isDigit(char.charCodeAt(0))).length === str.split("").filter((char) => char.charCodeAt(0) === NINE).length && str.split("").filter((char) => !isDigit(char.charCodeAt(0))).length === str.split("").filter((char) => char.charCodeAt(0) === Z).length;
};

const incDigit = (char) => char + 1 > NINE ? ZERO : char + 1
const incLetter = (char) => char + 1 > Z ? A : char + 1

const increment = (str, place = str.length - 1) => {
    if (place < 0) return str;
	
    if (areAllNine(str)) {
        return str.replace("9", "A").replace(/\9/gi, "0");
    }
    if (areAllNineAndZ(str)) {
        return str.replace("Z9", "ZA").replace(/\9/gi, "0");
    }

    const char = str.charCodeAt(place)

    const nextChar = isDigit(char) ? incDigit(char) : incLetter(char)

    const carry = nextChar - char !== 1;

    str = setChar(place, codeToChar(nextChar), str)

    if (carry)
        return increment(str, --place)
    else return str
}

export const incrementAlphanumeric = (str) => increment(str)