ethercalc/packages/socialcalc-headless/scripts/build.js

Multi-User Spreadsheet Server — TypeScript rewrite (Cloudflare fullstack)

import fs from 'node:fs';
import path from 'node:path';
import { fileURLToPath } from 'node:url';

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const input = path.join(__dirname, '../node_modules/socialcalc/dist/SocialCalc.js');
const output = path.join(__dirname, '../src/socialcalc.bundled.ts'); // Save as TS so it resolves correctly in vitest

let src = fs.readFileSync(input, 'utf8');

// SocialCalc 2.3.0 from github:audreyt/socialcalc is strict-mode clean and
// already has `factory.call(root, root)` (transform #3 from AGENTS.md §16.A).
// The remaining transforms are the two DOM shim redirects:
//   (1) route document.createElement through our ShimNode namespace
//   (2) silence alert() on error paths
// Plus one wrapper-level rewrite so our host-binding IIFE still captures root:
//   (3) neutralize the UMD's `globalThis` fallback so `root === this === host`
//       and `window === host` inside the factory — otherwise workerd's real
//       async setTimeout leaks in and recalc never unrolls synchronously.
src = src.replace(/document\.createElement\(/g, 'SocialCalc.document.createElement(');
src = src.replace(/alert\(/g, '(function(){})(');
src = src.replace(
  "typeof globalThis !== 'undefined' ? globalThis : this",
  "this",
);

const wrapped = `// @ts-nocheck
// Generated by scripts/build.js from audreyt/socialcalc. Do not hand-edit.
import { ShimNode } from './dom-shim';

export function createSocialCalcFactory() {
  const host = {
    setTimeout: function(cb) { cb(); return 0; },
    clearTimeout: function() {}
  };

  let SocialCalc;

  (function() {
    var navigator = { language: "", userAgent: "" };
    // Force the UMD's Node branch so nothing lands on the real
    // globalThis.SocialCalc. define stays undefined so AMD is also skipped.
    var module = { exports: {} };
    var define = undefined;

    ${src}

    SocialCalc = module.exports;
  }).call(host);

  SocialCalc.document = SocialCalc.document || {};
  SocialCalc.document.createElement = function (tag) { return new ShimNode(tag); };

  return SocialCalc;
}
`;

fs.writeFileSync(output, wrapped);
console.log('Generated socialcalc.bundled.ts');