A script to reproduce body-parser bug in bun that's affecting express.js.

bun-express-body-parser-bug.sh

#!/bin/bash
mkdir bun-express-body-parser-bug
cd bun-express-body-parser-bug
cat <<EOT > package.json
{
  "name": "bun-express-body-parser-bug",
  "module": "index.ts",
  "type": "module",
  "devDependencies": {
    "bun-types": "^0.3.0"
  },
  "dependencies": {
    "@types/express": "^4.17.15",
    "express": "^4.18.2"
  }
}
EOT
cat <<EOT > index.ts
import express from "express";

const port = 3000;
const app = express();
app.use(express.text());

app.post("/", async (req, res) => {
  res.send('ok')
});

app.listen(port, () => {
  console.log("Example app listening on port " + port);
  fetch("http://localhost:3000", {
    method: "POST",
    headers: {
      "Content-Type": "text/plain",
    },
    body: "Hello World",
  }).then(res => res.text()).then(console.log);
});
EOT
bun install
bun run index.ts