perf(@angular/build): replace watchpack with @parcel/watcher and chokidar - #33656
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…idar This change replaces the watchpack file watching dependency in @angular/build with @parcel/watcher as the primary native file watcher, while falling back to chokidar (v4) for polling or unsupported environments. By leveraging @parcel/watcher's native C++ bindings (FSEvents, ReadDirectoryChangesW, inotify), file system watching is offloaded directly to OS kernel APIs, significantly reducing CPU and memory footprint during watch mode. Additionally, external directory watches are dynamically subsumed to minimize active native file handles, while early path filtering and event coalescing prevent redundant incremental rebuild triggers.
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This change replaces the watchpack file watching dependency in @angular/build with @parcel/watcher as the primary native file watcher, while falling back to chokidar (v4) for polling or unsupported environments.
By leveraging @parcel/watcher's native C++ bindings (FSEvents, ReadDirectoryChangesW, inotify), file system watching is offloaded directly to OS kernel APIs, significantly reducing CPU and memory footprint during watch mode. Additionally, external directory watches are dynamically subsumed to minimize active native file handles, while early path filtering and event coalescing prevent redundant incremental rebuild triggers.