Howto capture (custom browser binary path) stderr and stdout to a file.
ASSERTION FAILED: !(newRadii.topLeft().width() && newRadii.topRight().width())
DEBUG=pw:browser* node script.js
var access = fs.createWriteStream(std.log);
process.stdout.write = process.stderr.write = access.write.bind(access);
logger: {
isEnabled: (name, severity) => name === 'browser',
log: (name, severity, message, args) => console.log(`${name} ${severity} ${message}`)
}
});Seems to don't work, some times captures just few lines of the Assertion output or SEGV message.
This thread is trying to answer question "How can I successfully capture stderr and stdout to a file using a custom browser binary path?"
Related Ask AI answer for "What is the process to redirect stderr and stdout to a file in Playwright with a custom browser binary path?".
Answer
Capturing Output to a File with a Custom Browser Binary Path in Playwright
First, you need to specify the custom browser binary path. Use the executablePath option when launching the browser. This allows you to run a specific browser executable instead of the bundled one. Here's how to do it:
const { chromium } = require('@playwright/test');
async function captureOutputToFile() {
const browser = await chromium.launch({
executablePath: 'https://ray.run/path/to/custom/browser',
});
// Your code here...
await browser.close();
}
captureOutputToFile();Next, you'll want to capture stderr and stdout output and redirect them to a file. You can do this using shell redirection operators when running your script. For example:
node my_script.js > output.txtThe > operator overwrites any existing content in output.txt, while >> appends new content. To capture both stderr and stdout into separate files, use different operators for each stream:
node my_script.js > stdout.txt 2> stderr.txtIf you want both streams combined into one file while preserving their order, use:
node my_script.js > combined_output.txt 2>&1Remember to replace my_script.js with the name of your Playwright script. Now you're all set to capture stderr and stdout output to a file using a custom browser binary path in Playwright!
Rayrun is a community for QA engineers. I am constantly looking for new ways to add value to people learning Playwright and other browser automation frameworks. If you have feedback, email [email protected].