How can I calculate BPM accurately from an audio file using JavaScript?

I’m working on a small web-based music tool and I’m interested in detecting the BPM of an audio file automatically.
What approaches are commonly used to calculate BPM programmatically? I’ve seen methods based on beat detection, onset detection, and analyzing the audio waveform, but I’m not sure which approach works best in a browser environment.
For a JavaScript-based application, would it be better to implement BPM detection with the Web Audio API, use an existing library, or process the audio on a backend?
I’d also like to understand how these approaches handle songs with live drumming, tempo changes, or less consistent timing.