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Bash
Watch a File for Changes (no inotify dep)
inotifywait is great when available, but on systems without inotify-tools you can poll mtime. Cheap enough to use in dev/CI workflows.
@admin
JavaScript
Long Polling Helper
Implements a long-polling loop that repeatedly calls a fetch endpoint and invokes a callback with the result. Backs off exponentially on errors and stops cleanly when cancelled via the returned stop function. A simple alternative to WebSockets for low-frequency server-push events without SSE support.