Watcher

Definitions

1. A process or library that subscribes to filesystem change notifications (via inotify on Linux, FSEvents on macOS, or ReadDirectoryChangesW on Windows) and triggers callbacks when files or directories are created, modified, or deleted.

   In plain English: A background process that watches your files and automatically does something whenever one of them changes.

   Example: "The file watcher detected a change in the SCSS directory and triggered the CSS rebuild."

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