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34 lines
1.5 KiB
Markdown
34 lines
1.5 KiB
Markdown
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# Troubleshooting
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<!-- GEN:toc -->
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<!-- GEN:stop -->
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## Browser dependencies
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Playwright does self-inspection every time it runs to make sure the browsers can be launched successfully. If there are missing
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dependencies, playwright will print instructions to acquire them.
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We also provide [Ubuntu 18.04 dockerfile](docker/Dockerfile.bionic) and [Ubuntu 20.04 dockerfile](docker/Dockerfile.focal) with the list of Debian dependencies.
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## Code transpilation issues
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If you are using a JavaScript transpiler like babel or TypeScript, calling `evaluate()` with an async function might not work. This is because while `playwright` uses `Function.prototype.toString()` to serialize functions while transpilers could be changing the output code in such a way it's incompatible with `playwright`.
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Some workarounds to this problem would be to instruct the transpiler not to mess up with the code, for example, configure TypeScript to use latest ECMAScript version (`"target": "es2018"`). Another workaround could be using string templates instead of functions:
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```js
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await page.evaluate(`(async() => {
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console.log('1');
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})()`);
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```
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## Node.js requirements
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### ReferenceError: URL is not defined
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Playwright requires Node.js 10 or higher. Node.js 8 is not supported, and will cause you to receive this error.
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# Please file an issue
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Playwright is a new project, and we are watching the issues very closely. As we solve common issues, this document will grow to include the common answers.
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