bundlers.cjs

const cp = require("child_process");
const path = require("path");
const fs = require("fs");

const expectedPath = path.join(__dirname, "expected.txt");
const expected = fs.readFileSync(expectedPath, "utf8");

{
  console.log("Building with webpack 4");
  cp.execSync("yarn webpack", {
    cwd: path.join(__dirname, "webpack-4"),
    encoding: "utf8",
  });
  console.log("Testing the webpack 4 bundle");
  const out = cp.execSync("node ./webpack-4/output.js", { encoding: "utf8" });

  if (expected === out) {
    console.log("OK");
  } else if (process.env.OVERWRITE) {
    fs.writeFileSync(expectedPath, out);
    console.log("UPDATED");
  } else {
    console.error("FAILED\n");
    console.error(out);
  }
}

{
  console.log("Building with webpack 5");
  cp.execSync("yarn webpack", {
    cwd: path.join(__dirname, "webpack-5"),
    encoding: "utf8",
  });
  console.log("Testing the webpack 5 bundle");
  const out = cp.execSync("node ./webpack-5/output.js", { encoding: "utf8" });

  if (expected === out) {
    console.log("OK");
  } else {
    console.error("FAILED\n");
    console.error(out);
  }
}