perf(@angular/build): replace watchpack with @parcel/watcher and chokidar#33656
Draft
clydin wants to merge 4 commits into
Draft
perf(@angular/build): replace watchpack with @parcel/watcher and chokidar#33656clydin wants to merge 4 commits into
clydin wants to merge 4 commits into
Conversation
angular-robot
Bot
added
area: performance
clydin
force-pushed
the
feat/replace-watchpack
branch
2 times, most recently
from
July 24, 2026 19:27
114d723 to
b989632
Compare
…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.
clydin
force-pushed
the
feat/replace-watchpack
branch
from
July 25, 2026 03:43
d8f6b10 to
b085b59
Compare
…t closed state When running Karma tests or when stream consumers (such as Architect test harness `executeOnce`) cancel the builder output stream early, both `ProgressNotifierReporter.onRunComplete` and `karma.Server` exit callbacks can attempt to enqueue results or close the `ReadableStreamController`. Under WHATWG Streams specification rules, calling `.enqueue()` or `.close()` on a controller whose `desiredSize` is `null` (closed or cancelled) throws `TypeError [ERR_INVALID_STATE]: Invalid state: Controller is already closed`. This change checks `controller.desiredSize !== null` and wraps enqueue/close calls in a try-catch block to gracefully handle closed controllers.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
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.