How should I use hook_cache_flush() or hook_rebuild() in a custom module to execute code when the cache is cleared?

I’m trying to create a module that executes some JavaScript code when the cache is flushed (via administrator menu or otherwise). I believe I can implement either hook_cache_flush() or hook_rebuild(), but I’m not quite sure how. I’m not necessarily looking for this to be done for me, but if I could be given a starting point and direction to head in, that’d be great.

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How should I use hook_cache_flush() or hook_rebuild() in a custom module to execute code when the cache is cleared?

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