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[native] Add "Clear media cache" button to dev menu

Authored by bartek on May 24 2023, 11:25 AM.
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I use this locally to clear the media cache when I'm testing encrypted multimedia.
This is related to ENG-2745 - I just found another use case for the custom menu buttons.

This should be run as a side effect in global scope. Subsequent calls override the previous one.

Docs on this feature:

Test Plan

Run the app and open dev menu (shake / press the m key while in metro console). The button should appear.

Simulator Screen Shot - iPhone 14 Pro - 2023-05-24 at 20.22.34.png (2×1 px, 279 KB)

When clicked, the button should clear the media cache and show a toast.

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Event Timeline

ashoat added inline comments.
16 ↗(On Diff #27012)

This isn't mentioned in the link above – wondering, how does alert work in Expo / React Native? Is this an alias for react-native's Alert component, or is it something specific to expo-dev-menu / registerDevMenuItems? (I figure the latter since you mentioned a "toast")

This revision is now accepted and ready to land.May 24 2023, 11:47 AM
16 ↗(On Diff #27012)

This display system native message box. The same kind of alert pops up massively when logging in/out saying that redux/database was cleared/hydrated etc.
Importing Alert from react-native seems to be optional.

Explicitly imported Alert from react-native to avoid further confusion.