Function classNames

src/utils.ts:3–4

(...classes: Array<string | undefined | false>)

import { DecorationType, BlockMapType, MapImageUrl } from "./types";

export const classNames = (...classes: Array<string | undefined | false>) =>
  classes.filter(a => !!a).join(" ");

export const getTextContent = (text: DecorationType[]) => {
  return text.reduce((prev, current) => prev + current[0], "");