ignorePattern doesn't seem to be working

[mansona]

Howdy 👋

Just trying to stop this gzipping my sourcemaps and I've been trying to add an ignorePattern that doesn't seem to be working 😕

I've tried ignorePattern: '**.map' and ignorePattern: '*.map' but they both still gzipped my sourcemaps. I even tried ignorePattern: '\*\*/\*.map', which I lifted from the default filePattern 😂

I ended up working around this by just using filePattern with map removed as an option, but I figured I should open an issue to see if there is anything I can do to help. I would love to add a failing test if someone could at least point me in the right direction.

[jrjohnson]

I have it as ignorePattern: '**/index.json' maybe ignorePattern: '**/*.map' would work for you?