[Bug]: Can't get downloaded file content

[ntcho]

Version

@cloudflare/playwright@1.0.0

Steps to reproduce

Steps

1. Run wrangler dev
2. Send any http request to the dev server (e.g. curl localhost:8787)

Files

src/index.ts

// Cloudflare Browser Rendering via Workers with Playwright
// https://developers.cloudflare.com/browser-rendering/platform/playwright/

import fs from 'node:fs';
import { launch } from '@cloudflare/playwright';

export default {
  async fetch(request: Request, env: Env) {
    function ls(path: string) {
      console.log(`ls ${path}\n`, fs.readdirSync(path));
    }

    const browser = await launch(env.MYBROWSER);
    console.log('Opened browser');

    ls('/tmp');
    ls('/tmp/playwright-artifacts-0');

    const page = await browser.newPage();
    await page.goto('https://sample-files.com/data/csv/');
    console.log('Navigated to sample-files.com/data/csv/');

    // listen for all download events
    page.on('download', async (download) => {
      console.log('Download event detected: ', download.suggestedFilename());
      // log save path
      const path = await download.path();
      console.log('Download path: ', path);
      // save to /tmp with suggested filename
      // const filePath = `/tmp/${download.suggestedFilename()}`;

      // console.log('Download event detected: ', download.suggestedFilename());
      // await download.saveAs(filePath);
      // console.log(`Download saved to ${filePath}`);
    });

    console.log('starting to click download buttons...');

    await page.getByRole('link', { name: 'Download Basic Data Set' }).click();
    // await page.getByRole('link', { name: 'Download Mixed Data Types' }).click();
    // await page.getByRole('link', { name: 'Download International Characters' }).click();

    const wait = 5;
    console.log(`waiting ${wait} seconds for downloads to complete...`);
    await new Promise((resolve) => setTimeout(resolve, wait * 1000));

    ls('/tmp');
    ls('/tmp/playwright-artifacts-0');

    return null;
  },
};

wrangler.jsonc

{
  "$schema": "./node_modules/wrangler/config-schema.json",
  "name": "workers-browser",
  "main": "src/index.ts",
  "compatibility_date": "2025-11-01",
  "workers_dev": true,
  "observability": {
    "enabled": true
  },
  "compatibility_flags": ["nodejs_compat"],
  "upload_source_maps": true,
  "browser": {
    "binding": "MYBROWSER",
    "remote": true
  }
}

package.json

{
  "name": "workers-browser",
  "version": "0.0.0",
  "private": true,
  "scripts": {
    "deploy": "wrangler deploy",
    "dev": "wrangler dev",
    "start": "wrangler dev",
    "test": "vitest",
    "cf-typegen": "wrangler types"
  },
  "devDependencies": {
    "@cloudflare/playwright": "^1.0.0",
    "@cloudflare/vitest-pool-workers": "^0.10.4",
    "@types/node": "^24.10.0",
    "typescript": "^5.9.3",
    "vitest": "~3.2",
    "wrangler": "^4.45.4"
  }
}

Expected behavior

Opened browser
ls /tmp
 [ 'playwright-artifacts-0' ]
ls /tmp/playwright-artifacts-0
 []
Navigated to sample-files.com/data/csv/
starting to click download buttons...
Download event detected:  basic-data.csv
Download path:  /tmp/playwright-artifacts-0/7f8a0c3c-ccbc-4aa3-9457-43529213a5aa
waiting 5 seconds for downloads to complete...
ls /tmp
 [ 'playwright-artifacts-0' ]
ls /tmp/playwright-artifacts-0
 [ '7f8a0c3c-ccbc-4aa3-9457-43529213a5aa' ]

The file should exist under the path

Actual behavior

Opened browser
ls /tmp
 [ 'playwright-artifacts-0' ]
ls /tmp/playwright-artifacts-0
 []
Navigated to sample-files.com/data/csv/
starting to click download buttons...
Download event detected:  basic-data.csv
Download path:  /tmp/playwright-artifacts-0/7f8a0c3c-ccbc-4aa3-9457-43529213a5aa
waiting 5 seconds for downloads to complete...
ls /tmp
 [ 'playwright-artifacts-0' ]
ls /tmp/playwright-artifacts-0
 []

There are no files under the path

Additional context

• download.path() - returns a path but can't find the file (maybe it's only in the browser worker?)
• download.createReadStream() - returns empty stream
• download.suggestedFilename() - returns correct suggested filename

I have a sense that this is because the browser worker is isolated from the main worker. But I couldn't find documentation on this edge case (whether it's supported or not currently)

Environment

System:
    OS: macOS 15.6
    CPU: (8) arm64 Apple M2
    Memory: 104.67 MB / 24.00 GB
  Binaries:
    Node: 22.17.0
    npm: 10.9.2
    pnpm: 10.20.0
  IDEs:
    VSCode: 1.105.1 - /opt/homebrew/bin/code
  Languages:
    Bash: 3.2.57 - /bin/bash