Unhandled promise rejection

[Khachatour]

When I am using this plugin, I keep getting

(node:29634) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): undefined
Can someone suggest an answer ?

[Khachatour]

I already fixed it, it cause by wrong webpack configuration, thanks!

[oliviertassinari]

@Khachatour So it's not on our side?

[Khachatour]

@oliviertassinari 100% no, But can you specify in error handling that it is from webpack. It took me a day to resolve that :) . For example to say that it comes from webpack configs ?

[oliviertassinari]

Do you have a reproduction example so I can have a look at?

[anthonator]

I'm running into this as well. @Khachatour could you post the solution?

[Khachatour]

@oliviertassinari Now I can't reproduce it, I am sure it came form my side. But I will try to reproduce that as soon as possible.
@anthonator As I mentioned I can't reproduce it, but as I remember it was coming form wrong configuration for service worker, are you creating sw file by your own ? I will try to reproduce that as soon as possible and return here with exact solution ok?

[oliviertassinari]

No rush, let us know if you find something :).

[Khachatour]

@oliviertassinari I've reproduced the error, It comes when in your webpack dev configs you declare the usage of service worker plugin and then in plugins section declare the usage of plugin with this code below:
new ServiceWorkerWebpackPlugin({ entry: path.join(__dirname, 'src/sw.js'), })
The error UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): undefined shows up. I think its when your declared path src/sw.js is not in the webpack output assets in development environment, or simply not correct path as I think. What you think ?
@anthonator Here it is!! :)

[anthonator]

The issue I was having was definitely an issue with my entry file not being found. I had a typo. I think this is just an issue of better error handing/reporting.

[Khachatour]

@anthonator I definitely agree with you. The error shown is not giving a clue what was wrong :)