Webpack plugin replaces "prod" with "dev" in output path and fails.

[freezy]

Library Affected:
workbox-webpack-plugin 3.2.0

Browser & Platform:
Linux, Node 8.11.1

Issue or Feature Request Description:
I'm building on my production server under a path that has production in it and for some reason Workbox replaces "prod" with "dev", resulting in "devuction", which obviously doesn't exist, and fails. The origin seems to be here.

The error looks like that:

 95% emitting GenerateSWError: One or more of the Workbox libraries could not be copied over to the destination directory: Error: ENOENT: no such file or directory, lstat '/var/www/website/devuction/v2.0.0/node_modules/workbox-background-sync/build/workbox-background-sync.prod.js'
    at _callee$ (/var/www/website/production/v2.0.0/node_modules/workbox-build/build/lib/copy-workbox-libraries.js:227:19)
    at tryCatch (/var/www/website/production/v2.0.0/node_modules/regenerator-runtime/runtime.js:62:40)
    at Generator.invoke [as _invoke] (/var/www/website/production/v2.0.0/node_modules/regenerator-runtime/runtime.js:296:22)
    at Generator.prototype.(anonymous function) [as throw] (/var/www/website/production/v2.0.0/node_modules/regenerator-runtime/runtime.js:114:21)
    at step (/var/www/website/production/v2.0.0/node_modules/babel-runtime/helpers/asyncToGenerator.js:17:30)
    at /var/www/website/production/v2.0.0/node_modules/babel-runtime/helpers/asyncToGenerator.js:30:13
    at <anonymous>

Renaming the production directory to something else solves it, or, even uglier, creating a devuction symlink pointing to production. Looking at the code there doesn't seem to be a way to disable that behavior.

Note that this is probably due to the importWorkboxFrom: 'local' option I'm using, so I suppose using the CDN would also resolve the issue, but I haven't tested that.

Any suggestions appreciated.

[jeffposnick]

Thanks for pointing this out—the code that handles this translation is pretty brittle, unfortunately. I'll file a PR and add some tests to at least help with this scenario.

[freezy]

Thanks guys, you're awesome!