excalidraw_0/scripts/updateReadme.js

const fs = require("fs");

const excalidrawDir = `${__dirname}/../src/packages/excalidraw`;
let data = fs.readFileSync(`${excalidrawDir}/README_NEXT.md`, "utf8");

// remove note for unstable release
data = data.replace(
  /<!-- unstable-readme-start-->[\s\S]*?<!-- unstable-readme-end-->/,
  "",
);

// replace "excalidraw-next" with "excalidraw"
data = data.replace(/excalidraw-next/g, "excalidraw");
data = data.trim();

const demoIndex = data.indexOf("### Demo");
const excalidrawNextNote =
  "#### Note\n\n**If you don't want to wait for the next stable release and try out the unreleased changes you can use [@excalidraw/excalidraw-next](https://www.npmjs.com/package/@excalidraw/excalidraw-next).**\n\n";
// Add excalidraw next note to try out for unreleased changes
data = data.slice(0, demoIndex) + excalidrawNextNote + data.slice(demoIndex);

// update readme
fs.writeFileSync(`${excalidrawDir}/README.md`, data, "utf8");