fix(core): optimistic current time update on seek to prevent slider snap-back

[mihar-22]

Closes #792

Summary

Clicking the time slider caused the thumb to snap back to the old position before jumping to the target because the store's currentTime only updated after the browser's async seeking/seeked events fired.

Changes

• Optimistically patch currentTime and seeking in the seek() action before setting media.currentTime, so the slider reflects the target position immediately
• Add tests verifying the optimistic update and its correction by the seeked event

Testing

pnpm -F @videojs/core test src/dom/store/features/tests/time.test.ts

Manual: open sandbox (pnpm dev:sandbox), play a video, click ahead on the time slider — thumb should not snap back.

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[github-actions]

📦 Bundle Size Report

🎨 @videojs/html

(no changes)

Presets (7)

Entry	Size
/video (default)	21.98 kB
/video (default + hls)	152.49 kB
/video (minimal)	21.85 kB
/video (minimal + hls)	152.39 kB
/audio (default)	20.37 kB
/audio (minimal)	20.34 kB
/background	6.36 kB

Media (4)

Entry	Size
/media/background-video	652 B
/media/container	1.86 kB
/media/hls-video	131.32 kB
/media/simple-hls-video	11.33 kB

Players (3)

Entry	Size
/video/player	6.22 kB
/audio/player	6.21 kB
/background/player	6.21 kB

Skins (14)

Entry	Type	Size
/video/minimal-skin.css	css	2.65 kB
/video/skin.css	css	2.69 kB
/video/minimal-skin	js	21.27 kB
/video/minimal-skin.tailwind	js	20.40 kB
/video/skin	js	21.38 kB
/video/skin.tailwind	js	20.51 kB
/audio/minimal-skin.css	css	2.13 kB
/audio/skin.css	css	2.16 kB
/audio/minimal-skin	js	19.80 kB
/audio/minimal-skin.tailwind	js	18.84 kB
/audio/skin	js	19.88 kB
/audio/skin.tailwind	js	19.04 kB
/background/skin.css	css	124 B
/background/skin	js	1009 B

UI Components (21)

Entry	Size
/ui/alert-dialog	2.02 kB
/ui/alert-dialog-close	1.20 kB
/ui/alert-dialog-description	1.13 kB
/ui/alert-dialog-title	1.15 kB
/ui/buffering-indicator	1.72 kB
/ui/captions-button	1.76 kB
/ui/controls	1.75 kB
/ui/fullscreen-button	1.74 kB
/ui/mute-button	1.74 kB
/ui/pip-button	1.74 kB
/ui/play-button	1.74 kB
/ui/playback-rate-button	1.77 kB
/ui/popover	3.02 kB
/ui/poster	1.64 kB
/ui/seek-button	1.75 kB
/ui/slider	2.21 kB
/ui/thumbnail	2.04 kB
/ui/time	1.85 kB
/ui/time-slider	2.93 kB
/ui/tooltip	2.42 kB
/ui/volume-slider	2.15 kB

Sizes are marginal over the root entry point.

⚛️ @videojs/react

(no changes)

Presets (7)

Entry	Size
/video (default)	15.83 kB
/video (default + hls)	146.51 kB
/video (minimal)	15.83 kB
/video (minimal + hls)	146.66 kB
/audio (default)	13.58 kB
/audio (minimal)	13.61 kB
/background	3.14 kB

Media (3)

Entry	Size
/media/background-video	539 B
/media/hls-video	131.60 kB
/media/simple-hls-video	11.74 kB

Skins (14)

Entry	Type	Size
/video/minimal-skin.css	css	2.65 kB
/video/skin.css	css	2.69 kB
/video/minimal-skin	js	15.73 kB
/video/minimal-skin.tailwind	js	18.21 kB
/video/skin	js	15.72 kB
/video/skin.tailwind	js	18.29 kB
/audio/minimal-skin.css	css	2.13 kB
/audio/skin.css	css	2.16 kB
/audio/minimal-skin	js	13.53 kB
/audio/minimal-skin.tailwind	js	15.25 kB
/audio/skin	js	13.44 kB
/audio/skin.tailwind	js	15.46 kB
/background/skin.css	css	90 B
/background/skin	js	272 B

UI Components (17)

Entry	Size
/ui/alert-dialog	2.71 kB
/ui/buffering-indicator	2.20 kB
/ui/captions-button	2.26 kB
/ui/controls	2.23 kB
/ui/fullscreen-button	2.26 kB
/ui/mute-button	2.25 kB
/ui/pip-button	2.21 kB
/ui/play-button	2.25 kB
/ui/playback-rate-button	2.26 kB
/ui/popover	3.08 kB
/ui/poster	2.02 kB
/ui/seek-button	2.24 kB
/ui/slider	3.09 kB
/ui/time	2.39 kB
/ui/time-slider	3.24 kB
/ui/tooltip	3.22 kB
/ui/volume-slider	3.08 kB

Sizes are marginal over the root entry point.

🧩 @videojs/core

(no changes)

Entries (5)

Entry	Size
.	4.78 kB
/dom	8.01 kB
/dom/media/custom-media-element	1.77 kB
/dom/media/hls	131.18 kB
/dom/media/simple-hls	11.28 kB

🏷️ @videojs/element

(no changes)

Entries (2)

Entry	Size
.	999 B
/context	936 B

📦 @videojs/store

(no changes)

Entries (3)

Entry	Size
.	1.32 kB
/html	700 B
/react	360 B

🔧 @videojs/utils

(no changes)

Entries (10)

Entry	Size
/array	104 B
/dom	1003 B
/events	227 B
/function	261 B
/object	119 B
/predicate	265 B
/string	148 B
/style	190 B
/time	478 B
/number	158 B

📦 @videojs/spf

(no changes)

Entries (3)

Entry	Size
.	40 B
/dom	9.48 kB
/playback-engine	9.37 kB

---

ℹ️ How to interpret

All sizes are standalone totals (minified + brotli).

Icon	Meaning
✅	No change
🔺	Increased ≤ 10%
🔴	Increased > 10%
🔽	Decreased
🆕	New (no baseline)

Run pnpm size locally to check current sizes.

[github-actions]

CI Failure Diagnosis

• Run: https://github.com/videojs/v10/actions/runs/22884541139
• Commit: fb01134e4af1448cc80a9b660309d9bb63bbad83

File	Type	What failed
packages/core/src/core/ui/types.ts	lint	noBannedTypes: {} used as default type parameter (lines 6, 13) — use object or Record<string, never>.
packages/spf/src/core/state/create-state.ts:154	lint	suppressions/unused: biome-ignore comment suppresses a rule that no longer triggers — remove it.
packages/spf/src/dom/features/end-of-stream.ts:208	lint	noBannedTypes: {} used as type annotation — use object or Record<string, never>.