Under what circumstances would compiler.fileTimestamps not be present?

For webpack@5 middlewares usage:

const webpack = require('webpack');
const middleware = require('webpack-dev-middleware');
const compiler = webpack({
  // webpack options
});

console.log(compiler.fileTimestamps);
// Output:
// webpack@4: Map(0) {}
// webpack@5: undefined

Interesting - has compiler.fileTimestamps been replaced by something else in webpack 5?

cc @sokra @alexander-akait

Yes with FileSystemInfo and the snapshot system.

Avoid comparing timestamps directly and use a snapshot instead

Yes with FileSystemInfo and the snapshot system.

Avoid comparing timestamps directly and use a snapshot instead

@elf-mouse would you care to take a look at @sokra's suggestion around migrating to use these APIs instead?

This feels like a better approach.

Hi @johnnyreilly ,

It is recommended to update the patch first to fix this bug to ensure online security.

I would migrate to use new APIs when I have time later.

THX~

Thanks @elf-mouse - but I'm not very keen on the current workaround; going for the new APIs feels like the better approach.

do I understand correctly that the only workaround for now is not to use webpack 5?

If someone would like to create a minimal reproduction repo that illustrates this issue, it might help people to work on this.

If someone would like to create a minimal reproduction repo that illustrates this issue, it might help people to work on this.

There is a simple example:
https://stackoverflow.com/questions/67699117/error-when-trying-to-run-dev-server-react-ssr

Any progress in fixing this issue?

This error seems to have popped out of nowhere for me. Have been using Next / webpack 5 for a while and previously compiled fine.

If someone would like to submit a PR which makes use of the advice provided by @sokra we'll happily take a look:

Yes with FileSystemInfo and the snapshot system.

Avoid comparing timestamps directly and use a snapshot instead