discord split message

splitMessage.js

const Discord = require("discord.js");

const splitMessage = (text, { maxLength = 2_000, char = "\n", prepend = "", append = "" } = {}) => {
	text = Discord.Util.verifyString(text);

	if (text.length <= maxLength) return [text];

	let splitText = [text];

	if (Array.isArray(char)) {
		while (char.length > 0 && splitText.some((elem) => elem.length > maxLength)) {
			const currentChar = char.shift();

			if (currentChar instanceof RegExp) splitText = splitText.flatMap((chunk) => chunk.match(currentChar));
			else splitText = splitText.flatMap((chunk) => chunk.split(currentChar));
		}
	} else splitText = text.split(char);

	if (splitText.some((elem) => elem.length > maxLength)) throw new RangeError("SPLIT_MAX_LEN");

	const messages = [];
	let msg = "";

	for (const chunk of splitText) {
		if (msg && (msg + char + chunk + append).length > maxLength) {
			messages.push(msg + append);
			msg = prepend;
		}

		msg += (msg && msg !== prepend ? char : "") + chunk;
	}

	return messages.concat(msg).filter((m) => m);
};