How about you can pass true to include it, or (optionally) you can pass an object or a function, which gets used as the argument to workbox.googleAnalytics.initialize()?

It's historically been messy when converting from an workbox-build option that might have non-primitive values (like options set to a function) into the equivalent string representation.

#1598 just took care of that for one case, when folks might end up setting runtimeCaching.options.plugins to a function value. I guess we could follow that model and support usage like:

offlineGoogleAnalytics: {
  hitFilter: (params) => {
    const queueTimeInSeconds = Math.round(params.get('qt') / 1000);
    params.set('cm1', queueTimeInSeconds);
  },
},

Do you feel like enough folks end up needing custom configs that the (slight) extra complexity is worthwhile? Might as well?

I think it's worth it, if it's possible.

When not using any customization options, users have no way of knowing if their offline analytics are working, so I'd like to encourage more usage of the customization options wherever possible.

Okay, I've used the technique from #1598 and passing in a full range of config options, including functions, seems to work.

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