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YouTube Helper API.
These are versions of this script where the code was updated. Show all versions.
Added a 5th logging level.
Tweaked logging level for a few messages.
fix typo
New Debug System: Added api.debug with 4 logging levels (minimal, typical, detailed, all). Logs point to the caller's line number. New Helpers: Added reloadToCurrentProgress() and exposed gmCapabilities. Internal Improvements: Library now uses the new debug system for cleaner console output and better error handling.
api.debug
minimal
typical
detailed
all
reloadToCurrentProgress()
gmCapabilities
Moved 'use strict' to global scope. Added added a shim for Greasemonkey API functions. This should catch missing GM or permission not granted errors without crashing.
'use strict'
Fixed video playback language updates not being detected correctly.
Update comments and logging.
Switched to an isolated library pattern.
Updated to be a global singleton. (again) Updated to inject into the newer/broader globalThis instead of window.
globalThis
window
Made language track detection more robust. Added logic to determine if the video is auto dubbed with its own appState value.
Updated API logic to match YouTube's new audio track format.
Fixed an issue that caused the script to notify itself being ready before the data has finished populating.
Fixed a bug that caused the script process videos before all video data has loaded into the video player.
Fixed a bug that caused the video html element to become stale after reloading throw YouTube's API. This seems to be new YouTube behavior introduced by the New Delhi (2025) UI update.
Fixed a race condition where ad states and video states can update in random order depending on loading conditions.
Fixed a bug that caused player updates to be handled event when video data does not exist. Fixed a race condition bug that caused the API to return incorrect data.
fix type
Excluded certain urls from being early processed.
Updated to track if the current video has been streamed or premiered. (basically any format that could have a chat log would return true)
Updated the API to directly reference read-only proxy objects for better performance. Updated page type to use the current page URL as fallback when YouTube's native API fails to return a proper response.
Updated how the player api fallback working when running in iframes. Updated the listener player update event.
storageApi
page
reloadVideo
_
timeupdate
WeakMap
GM
Added a fuction to reload the current video.
Added distinction between content that is live or was live (VOD), and content that is currently live exclusively.
Added a private event target so we don't fire event into the document directly. Global event handshake may eventually be added.
Use a singleton pattern for initiation to avoid duplicate events firing.
Fixed tracked playback progress not updating when loading a new video.
Updated all public storage functions to eager sync between script storage and local storage. Updated page type updating to listen for different events. Should now update earlier and more consistently. Fix time specified video detection. YouTube player response object turns out to be unreliable for this.
No longer exposing storageApi. Added public delete and list functions for synced storage.
Added support for time specified video detection. Added support for playlist id detection. Exposed storagedApi to publicApi.
storagedApi
publicApi
Fixed ad detection and tracking.
Updated player selector for mobile.
Updated how premium bitrate options are determined.
minor update. no functional change.
Updated saving and loading logic to try to use both GM and localStorage in parallel.
Let consumer scripts to grant handling.
minor bug fix.
Testing if GM functions can be extracted to a helper api.
Implemented a custom video playback progress tracking function that avoids tracking ad playback progresses. Implemented a custom ad state tracking function. Implemented a custom function to reload the current playing video to the current tracked playback progress. Removed inline comments. Code is just updating too much to maintain comments at this point.
-
Added inline documentations. Added save/load functions for settings.
Delay initial player update check with the pageshow event listener.
pageshow
Added a proxy for YouTube's API
Changed page type finding logic. Could be reverted.
test loading order.
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