test.js

import fs from "fs";
import path, { dirname } from "path";
import assert from "assert";
import { spawn } from "child_process";
import syntaxError from "syntax-error";
import { fileURLToPath } from "url";
import { createRequire } from "module";

const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);
const require = createRequire(__dirname);

let folders = [
  ".",
  ...Object.keys(require(path.join(__dirname, "./package.json")).directories),
];
let files = [];
for (let folder of folders)
  for (let file of fs.readdirSync(folder).filter((v) => v.endsWith(".js")))
    files.push(path.resolve(path.join(folder, file)));
for (let file of files) {
  if (file == __filename) continue;
  console.error("Checking", file);
  const error = syntaxError(fs.readFileSync(file, "utf8"), file, {
    sourceType: "module",
    allowReturnOutsideFunction: true,
    allowAwaitOutsideFunction: true,
  });
  if (error) assert.ok(error.length < 1, file + "\n\n" + error);
  assert.ok(file);
  console.log("Done ☑️", file);
}