--watch option for CLI

[bennypowers]

Library Affected:
workbox-cli

Browser & Platform:
All Browsers - development on Linux, Windows, Mac, Haiku ;)

Issue or Feature Request Description:
Please consider adding a --watch flag to workbox-cli which would rebuild the service worker when watched files change.

[jeffposnick]

Just to clarify here: you'd like a rebuild triggered when any of the files that match the specified glob patterns change, right?

What if there's an additional file that's added after --watch has been invoked and which matches the pattern—should that also trigger a rebuild? (And if it didn't trigger a rebuild, would you consider that a bug?)

[jeffposnick]

https://github.com/gulpjs/glob-watcher has pretty much drop-in support for what's currently being configured in globPatterns/globDirectory/globIgnore, so I'm going to assume that the expected behavior is just to pass those in and do whatever you'd get by default.

[bennypowers]

@jeffposnick Thanks for visiting this issue. Yes, I'm happy to defer semantics to whichever popular package. Chokidar or watchman are other options.