NicholasBly/youtube-webos 0.7.2 on GitHub

Summary

Implemented emojis into YouTube app via twemoji for legacy webOS - #42
Implemented fix for mathematical symbols/characters
Text/emoji fixes only run on webOS 3 - 5 and is excluded from modern build
Removed font-fix.css and applied new rules injected via style ID legacy-webos-font-fix in emoji-font.ts

Handle sending URLs to TV via luna/ssap - #52
Bypasses login screen in guest mode and normal mode - checks whether you are in guest mode or logged in to properly select the right login screen element
Hides login screen until it is successfully bypassed, allowing clean load right into video

Fixed SponsorBlock segments not appearing on progress bar for 5 seconds on video load if Return YouTube Dislike was disabled
Fixed segment sleep timer continuing if video was paused (timer now syncs with YouTube play/pause events to track time)

Fix first config menu open key press sometimes not working on fresh app load
Changed "Upgrade Thumbnail Quality" to "Max Thumbnail Quality" text in config UI
Exclude Google Cast Block from running on webOS 25 simulator
Resolved "This document requires TrustedHTML assignment" error + crash

Fast Forward / Rewind Burst: Only set video time after 200ms, so quick key presses don't trigger video seek events multiple times, causing lag

CPU Hot Path Optimization (handleStateChange):

Config Caching: Replaced the expensive configRead call in every state change with a cached _shouldForce boolean that updates via listener
Static Constants: Moved WebOSVersion() check to a top-level constant IS_WEBOS_25 to avoid function call overhead on every check
Execution Guard: Added a kickstartInProgress guard to ensurePlaybackStarts to prevent multiple concurrent recursive loops/promises from spawning during rapid state changes

Memory & Allocation:

Object Reuse: Cached the localStorage qualityObj structure to reduce garbage collection pressure
Reduced Parsing: Optimized setLocalStorageQuality to avoid unnecessary JSON parsing if the cache is already valid

Algorithmic Improvements:

Fail-Fast Logic: Reordered checks in hot functions to exit immediately (e.g., checking isDestroyed or !_shouldForce before doing any work)
Event Loop Efficiency: Used requestAnimationFrame for DOM updates to align with the browser's refresh rate and prevent layout thrashing

Code Updates:

Combined variable declarations
Utilized short-circuit evaluation for logging (DEBUG && console.log) to prevent argument evaluation in production

O(1) Operations: Replaced multiple sequential if checks with a constant-time array iteration over predefined keys. This scales better and improves cache locality
Dead Code Removal: Removed the enable logic inside disableWhosWatching since it's never called
Performance: Replaced Date object instantiation and manipulation (which involves overhead) with direct integer arithmetic using Date.now()
Code Reduction: Reduced lines by ~50% while maintaining readability and original functionality
Consistency: Standardized variable naming and error handling

After no segments are found on the server, run destroy() to clean up SponsorBlock so no observers are running unnecessarily
Tighten sleep timer thresholds (5s -> 3s before segment and 2s -> 1s buffer)
Prioritize nextSegmentIndex instead of handleTimeUpdate to check the predicted segment index first (O(1)) before binary search (O(log N))
Move additional config keys to the top of the file and map them along with existing CONFIG_MAPPING
checkForProgressBar() -> Cache successful selector for progress bar and try that first when called
Remove duplicated logic in play and seeked events which is already handled in executeChainSkip
handleTimeUpdate() additional early exit optimization