refactor(auto-thumbnail): [PKG-AUTO-THUMB-03] type internal extraction contracts

docs/compiled/artplayer-plugin-auto-thumbnail.js

@@ -4,4 +4,4 @@
  * (c) 2017-2026 Harvey Zhao
  * Released under the MIT License.
  */
-!function(e,t){"object"===typeof exports&&"undefined"!==typeof module?module.exports=t():"function"==typeof define&&define.amd?(e.artplayerPluginAutoThumbnail=t(),define(function(){return e.artplayerPluginAutoThumbnail})):(e="undefined"!==typeof globalThis?globalThis:e||self).artplayerPluginAutoThumbnail=t()}(this,function(){"use strict";function e(e){let t,n=!1;for(const r of e)try{r()}catch(i){n||(n=!0,t=i)}return{failed:n,failure:t}}function t(t,n){const i="function"===typeof n.requestVideoFrameCallback&&"function"===typeof n.cancelVideoFrameCallback;let r;function o(){const t=r;if(r=void 0,n.onloadeddata=null,n.onseeked=null,!t)return;const i=e([()=>clearTimeout(t.timer),()=>{null!==t.frame&&n.cancelVideoFrameCallback(t.frame)}]);if(i.failed)throw i.failure}return t.own(o),(e,a)=>{if(o(),!t.active())return;const u={frame:null,timer:null,sought:!1,presented:!i,retries:0,sequence:0,started:!1};r=u;const d=()=>t.active()&&r===u,s=t.guard(()=>{d()&&u.sought&&u.presented&&(o(),t.active()&&a())}),c=()=>{u.sought=!1,(()=>{if(!i)return;const e=++u.sequence;u.presented=!1;const r=u.frame;if(u.frame=null,null!==r&&n.cancelVideoFrameCallback(r),!d())return;let o=!1;const a=n.requestVideoFrameCallback(t.guard(()=>{d()&&e===u.sequence&&!o&&(o=!0,u.frame=null,u.presented=!0,s())}));d()&&e===u.sequence&&!o?u.frame=a:n.cancelVideoFrameCallback(a)})(),d()&&(n.currentTime=e)},l=t.guard(()=>{d()&&!u.started&&(u.started=!0,n.onloadeddata=null,n.onseeked=t.guard(()=>{if(!d()||n.seeking)return;const t=n.currentTime;if(d())if(!Number.isFinite(t)||Math.abs(t-e)>.05){if(++u.retries>3)throw new Error("Auto-thumbnail seek did not reach the requested time");c()}else u.sought=!0,s()}),c())});if(u.timer=setTimeout(t.guard(()=>{if(d())throw new Error("Auto-thumbnail frame readiness timed out")}),3e4),!d())return void clearTimeout(u.timer);const f=!i||n.readyState>=2;d()&&(f?l():n.onloadeddata=l)}}function n(e,n){const i=function(e){const t=document.createElement("video");e.own(()=>t.remove()),e.own(()=>t.load()),e.own(()=>t.removeAttribute("src")),e.own(()=>t.pause());for(const n of["onloadedmetadata","onloadeddata","onseeked","onerror"])e.own(()=>{t[n]=null});return e.active()?(t.crossOrigin="anonymous",t.muted=!0,t.playsInline=!0,t.tabIndex=-1,t.setAttribute("aria-hidden","true"),t.style.cssText="position:fixed;left:0;top:0;visibility:hidden;pointer-events:none;display:block;width:auto;height:auto;max-width:none;max-height:none",document.documentElement.appendChild(t),e.active()||t.remove(),t):t}(e);e.active()&&(i.onerror=e.guard(()=>{throw i.error||new Error("Auto-thumbnail media failed to load")}),i.onloadedmetadata=e.guard(()=>{i.onloadedmetadata=null;const r=i.duration,o=i.videoHeight,a=i.videoWidth,{height:u,canvasWidth:d,canvasHeight:s}=function(e,t){if(!Number.isFinite(t.duration)||t.duration<=0||!Number.isFinite(t.videoWidth)||t.videoWidth<=0||!Number.isFinite(t.videoHeight)||t.videoHeight<=0)throw new TypeError("Auto-thumbnail requires finite media duration and dimensions");const n=Math.floor(e.width*t.videoHeight/t.videoWidth),i=Math.trunc(10*e.width),r=Math.trunc(n*Math.ceil(e.number/10));if(![n,i,r].every(e=>Number.isSafeInteger(e)&&e>0&&e<=4294967295))throw new RangeError("Auto-thumbnail canvas dimensions are invalid");return{height:n,canvasWidth:i,canvasHeight:r}}(n,{duration:r,videoHeight:o,videoWidth:a});if(!e.active())return;i.width=a,i.height=o,i.style.width=`${a}px`,i.style.height=`${o}px`;const c=document.createElement("canvas");if(!e.active())return;c.width=d,c.height=s;const l=c.getContext("2d");if(!l)throw new Error("Auto-thumbnail canvas context is unavailable");if(!e.active())return;const f=t(e,i);let h=0;const m=e.guard(()=>{h>=n.number?e.dispose():f(r*h/n.number,e.guard(()=>{if(l.drawImage(i,h%10*n.width,Math.floor(h/10)*u,n.width,u),!e.active())return;let t=!1;c.toBlob(e.guard(i=>{t||(t=!0,e.publish(i,{height:u,column:10,number:n.number,width:n.width,scale:n.scale}),e.active()&&(h+=1,m()))}),"image/jpeg")}))});m()}),e.active()&&(i.src=n.url))}return function(t){return async i=>{const r=e=>console.warn("ArtPlayer auto-thumbnail failed:",e),o=function(t,n){let i,r,o=!1;const a=new Set;function u(e){a.delete(e)&&URL.revokeObjectURL(e)}function d(){const e=i;i=void 0,e?.dispose()}return{start:function(){if(o)return;const d=i,s=[];let c=!1;const l={active:()=>!o&&!c&&i===l,own(t){if(c){const i=e([t]);i.failed&&n(i.failure)}else s.push(t)},dispose(){if(c)return;c=!0,i===l&&(i=void 0);const t=e(s.splice(0).reverse());t.failed&&n(t.failure)},fail(e){l.active()&&(l.dispose(),n(e))},guard:e=>(...t)=>{if(l.active())try{return e(...t)}catch(n){l.fail(n)}},publish(i,o){if(!l.active())return;if(!i)throw new Error("Auto-thumbnail encoding returned no Blob");const d=URL.createObjectURL(i);if(a.add(d),!l.active())return void u(d);const s=r;r=d;try{t({url:d,...o})}catch(c){r===d&&(r=a.has(s)?s:void 0);const t=e([()=>u(d)]);throw t.failed&&n(t.failure),c}u(s)}};return i=l,d?.dispose(),l},cancel:d,destroy:function(){if(o)rLine truncated
+!function(e,t){"object"===typeof exports&&"undefined"!==typeof module?module.exports=t():"function"==typeof define&&define.amd?(e.artplayerPluginAutoThumbnail=t(),define(function(){return e.artplayerPluginAutoThumbnail})):(e="undefined"!==typeof globalThis?globalThis:e||self).artplayerPluginAutoThumbnail=t()}(this,function(){"use strict";function e(e){let t,n=!1;for(const r of e)try{r()}catch(i){n||(n=!0,t=i)}return{failed:n,failure:t}}function t(t,n){const i="function"===typeof n.requestVideoFrameCallback&&"function"===typeof n.cancelVideoFrameCallback;let r;function o(){const t=r;if(r=void 0,n.onloadeddata=null,n.onseeked=null,!t)return;const i=e([()=>{null!==t.timer&&clearTimeout(t.timer)},()=>{null!==t.frame&&n.cancelVideoFrameCallback(t.frame)}]);if(i.failed)throw i.failure}return t.own(o),(e,a)=>{if(o(),!t.active())return;const u={frame:null,timer:null,sought:!1,presented:!i,retries:0,sequence:0,started:!1};r=u;const d=()=>t.active()&&r===u,s=t.guard(()=>{d()&&u.sought&&u.presented&&(o(),t.active()&&a())}),c=()=>{u.sought=!1,(()=>{if(!i)return;const e=++u.sequence;u.presented=!1;const r=u.frame;if(u.frame=null,null!==r&&n.cancelVideoFrameCallback(r),!d())return;let o=!1;const a=n.requestVideoFrameCallback(t.guard(()=>{d()&&e===u.sequence&&!o&&(o=!0,u.frame=null,u.presented=!0,s())}));d()&&e===u.sequence&&!o?u.frame=a:n.cancelVideoFrameCallback(a)})(),d()&&(n.currentTime=e)},l=t.guard(()=>{d()&&!u.started&&(u.started=!0,n.onloadeddata=null,n.onseeked=t.guard(()=>{if(!d()||n.seeking)return;const t=n.currentTime;if(d())if(!Number.isFinite(t)||Math.abs(t-e)>.05){if(++u.retries>3)throw new Error("Auto-thumbnail seek did not reach the requested time");c()}else u.sought=!0,s()}),c())});if(u.timer=setTimeout(t.guard(()=>{if(d())throw new Error("Auto-thumbnail frame readiness timed out")}),3e4),!d())return void clearTimeout(u.timer);const f=!i||n.readyState>=2;d()&&(f?l():n.onloadeddata=l)}}function n(e,n){const i=function(e){const t=document.createElement("video");e.own(()=>t.remove()),e.own(()=>t.load()),e.own(()=>t.removeAttribute("src")),e.own(()=>t.pause());for(const n of["onloadedmetadata","onloadeddata","onseeked","onerror"])e.own(()=>{t[n]=null});return e.active()?(t.crossOrigin="anonymous",t.muted=!0,t.playsInline=!0,t.tabIndex=-1,t.setAttribute("aria-hidden","true"),t.style.cssText="position:fixed;left:0;top:0;visibility:hidden;pointer-events:none;display:block;width:auto;height:auto;max-width:none;max-height:none",document.documentElement.appendChild(t),e.active()||t.remove(),t):t}(e);e.active()&&(i.onerror=e.guard(()=>{throw i.error||new Error("Auto-thumbnail media failed to load")}),i.onloadedmetadata=e.guard(()=>{i.onloadedmetadata=null;const r=i.duration,o=i.videoHeight,a=i.videoWidth,{height:u,canvasWidth:d,canvasHeight:s}=function(e,t){if(!Number.isFinite(t.duration)||t.duration<=0||!Number.isFinite(t.videoWidth)||t.videoWidth<=0||!Number.isFinite(t.videoHeight)||t.videoHeight<=0)throw new TypeError("Auto-thumbnail requires finite media duration and dimensions");const n=Math.floor(e.width*t.videoHeight/t.videoWidth),i=Math.trunc(10*e.width),r=Math.trunc(n*Math.ceil(e.number/10));if(![n,i,r].every(e=>Number.isSafeInteger(e)&&e>0&&e<=4294967295))throw new RangeError("Auto-thumbnail canvas dimensions are invalid");return{height:n,canvasWidth:i,canvasHeight:r}}(n,{duration:r,videoHeight:o,videoWidth:a});if(!e.active())return;i.width=a,i.height=o,i.style.width=`${a}px`,i.style.height=`${o}px`;const c=document.createElement("canvas");if(!e.active())return;c.width=d,c.height=s;const l=c.getContext("2d");if(!l)throw new Error("Auto-thumbnail canvas context is unavailable");if(!e.active())return;const f=t(e,i);let h=0;const m=e.guard(()=>{h>=n.number?e.dispose():f(r*h/n.number,e.guard(()=>{if(l.drawImage(i,h%10*n.width,Math.floor(h/10)*u,n.width,u),!e.active())return;let t=!1;c.toBlob(e.guard(i=>{t||(t=!0,e.publish(i,{height:u,column:10,number:n.number,width:n.width,scale:n.scale}),e.active()&&(h+=1,m()))}),"image/jpeg")}))});m()}),e.active()&&(i.src=n.url))}return function(t){return async i=>{const r=e=>console.warn("ArtPlayer auto-thumbnail failed:",e),o=function(t,n){let i,r,o=!1;const a=new Set;function u(e){void 0!==e&&a.delete(e)&&URL.revokeObjectURL(e)}function d(){const e=i;i=void 0,e?.dispose()}return{start:function(){if(o)return;const d=i,s=[];let c=!1;const l={active:()=>!o&&!c&&i===l,own(t){if(c){const i=e([t]);i.failed&&n(i.failure)}else s.push(t)},dispose(){if(c)return;c=!0,i===l&&(i=void 0);const t=e(s.splice(0).reverse());t.failed&&n(t.failure)},fail(e){l.active()&&(l.dispose(),n(e))},guard:e=>(...t)=>{if(l.active())try{return e(...t)}catch(n){l.fail(n)}},publish(i,o){if(!l.active())return;if(!i)throw new Error("Auto-thumbnail encoding returned no Blob");const d=URL.createObjectURL(i);if(a.add(d),!l.active())return void u(d);const s=r;r=d;try{t({url:d,...o})}catch(c){r===d&&(r=void 0!==s&&a.has(s)?s:void 0);const t=e([()=>u(d)]);throw t.failed&&n(t.failure),c}u(s)}};return i=l,d?.dispoLine truncated

docs/compiled/artplayer-plugin-auto-thumbnail.legacy.js

@@ -4,4 +4,4 @@
  * (c) 2017-2026 Harvey Zhao
  * Released under the MIT License.
  */
-!function(e,t){"object"===typeof exports&&"undefined"!==typeof module?module.exports=t():"function"==typeof define&&define.amd?(e.artplayerPluginAutoThumbnail=t(),define(function(){return e.artplayerPluginAutoThumbnail})):(e="undefined"!==typeof globalThis?globalThis:e||self).artplayerPluginAutoThumbnail=t()}(this,function(){"use strict";var e=Object.defineProperty,t=Object.getOwnPropertySymbols,n=Object.prototype.hasOwnProperty,r=Object.prototype.propertyIsEnumerable,i=(t,n,r)=>n in t?e(t,n,{enumerable:!0,configurable:!0,writable:!0,value:r}):t[n]=r;function o(e){let t,n=!1;for(const i of e)try{i()}catch(r){n||(n=!0,t=r)}return{failed:n,failure:t}}function a(e,a){let u,d,l=!1;const c=new Set;function s(e){c.delete(e)&&URL.revokeObjectURL(e)}function f(){const e=u;u=void 0,null==e||e.dispose()}return{start:function(){if(l)return;const f=u,h=[];let m=!1;const b={active:()=>!l&&!m&&u===b,own(e){if(m){const t=o([e]);t.failed&&a(t.failure)}else h.push(e)},dispose(){if(m)return;m=!0,u===b&&(u=void 0);const e=o(h.splice(0).reverse());e.failed&&a(e.failure)},fail(e){b.active()&&(b.dispose(),a(e))},guard:e=>(...t)=>{if(b.active())try{return e(...t)}catch(n){b.fail(n)}},publish(u,l){if(!b.active())return;if(!u)throw new Error("Auto-thumbnail encoding returned no Blob");const f=URL.createObjectURL(u);if(c.add(f),!b.active())return void s(f);const h=d;d=f;try{e(((e,o)=>{for(var a in o||(o={}))n.call(o,a)&&i(e,a,o[a]);if(t)for(var a of t(o))r.call(o,a)&&i(e,a,o[a]);return e})({url:f},l))}catch(m){d===f&&(d=c.has(h)?h:void 0);const e=o([()=>s(f)]);throw e.failed&&a(e.failure),m}s(h)}};return u=b,null==f||f.dispose(),b},cancel:f,destroy:function(){if(l)return;l=!0;const e=o([f,...[...c].map(e=>()=>s(e))]);d=void 0,e.failed&&a(e.failure)},get closed(){return l}}}function u(e,t){const n="function"===typeof t.requestVideoFrameCallback&&"function"===typeof t.cancelVideoFrameCallback;let r;function i(){const e=r;if(r=void 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Error("Auto-thumbnail seek did not reach the requested time");c()}else u.sought=!0,l()}),c())});if(u.timer=setTimeout(e.guard(()=>{if(d())throw new Error("Auto-thumbnail frame readiness timed out")}),3e4),!d())return void clearTimeout(u.timer);const f=!n||t.readyState>=2;d()&&(f?s():t.onloadeddata=s)}}function d(e,t){const n=function(e){const t=document.createElement("video");e.own(()=>t.remove()),e.own(()=>t.load()),e.own(()=>t.removeAttribute("src")),e.own(()=>t.pause());for(const n of["onloadedmetadata","onloadeddata","onseeked","onerror"])e.own(()=>{t[n]=null});return e.active()?(t.crossOrigin="anonymous",t.muted=!0,t.playsInline=!0,t.tabIndex=-1,t.setAttribute("aria-hidden","true"),t.style.cssText="position:fixed;left:0;top:0;visibility:hidden;pointer-events:none;display:block;width:auto;height:auto;max-width:none;max-height:none",document.documentElement.appendChild(t),e.active()||t.remove(),t):t}(e);e.active()&&(n.onerror=e.guard(()=>{throw n.error||new Error("Auto-thumbnail media failed to load")}),n.onloadedmetadata=e.guard(()=>{n.onloadedmetadata=null;const r=n.duration,i=n.videoHeight,o=n.videoWidth,{height:a,canvasWidth:d,canvasHeight:l}=function(e,t){if(!Number.isFinite(t.duration)||t.duration<=0||!Number.isFinite(t.videoWidth)||t.videoWidth<=0||!Number.isFinite(t.videoHeight)||t.videoHeight<=0)throw new TypeError("Auto-thumbnail requires finite media duration and dimensions");const n=Math.floor(e.width*t.videoHeight/t.videoWidth),r=Math.trunc(10*e.width),i=Math.trunc(n*Math.ceil(e.number/10));if(![n,r,i].every(e=>Number.isSafeInteger(e)&&e>0&&e<=4294967295))throw new RangeError("Auto-thumbnail canvas dimensions are invalid");return{height:n,canvasWidth:r,canvasHeight:i}}(t,{duration:r,videoHeight:i,videoWidth:o});if(!e.active())return;n.width=o,n.height=i,n.style.width=`${o}px`,n.style.height=`${i}px`;const c=document.createElement("canvas");if(!e.active())return;c.width=d,c.height=l;const s=c.getContext("2d");if(!s)throw new Error("Auto-thumbnail canvas context is unavailable");if(!e.active())return;const f=u(eLine truncated
+!function(e,t){"object"===typeof exports&&"undefined"!==typeof module?module.exports=t():"function"==typeof define&&define.amd?(e.artplayerPluginAutoThumbnail=t(),define(function(){return e.artplayerPluginAutoThumbnail})):(e="undefined"!==typeof globalThis?globalThis:e||self).artplayerPluginAutoThumbnail=t()}(this,function(){"use strict";var e=Object.defineProperty,t=Object.getOwnPropertySymbols,n=Object.prototype.hasOwnProperty,r=Object.prototype.propertyIsEnumerable,i=(t,n,r)=>n in t?e(t,n,{enumerable:!0,configurable:!0,writable:!0,value:r}):t[n]=r;function o(e){let t,n=!1;for(const i of e)try{i()}catch(r){n||(n=!0,t=r)}return{failed:n,failure:t}}function a(e,a){let u,d,l=!1;const c=new Set;function s(e){void 0!==e&&c.delete(e)&&URL.revokeObjectURL(e)}function f(){const e=u;u=void 0,null==e||e.dispose()}return{start:function(){if(l)return;const f=u,h=[];let m=!1;const v={active:()=>!l&&!m&&u===v,own(e){if(m){const t=o([e]);t.failed&&a(t.failure)}else 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e=t.currentTime;if(d())if(!Number.isFinite(e)||Math.abs(e-o)>.05){if(++u.retries>3)throw new Error("Auto-thumbnail seek did not reach the requested time");c()}else u.sought=!0,l()}),c())});if(u.timer=setTimeout(e.guard(()=>{if(d())throw new Error("Auto-thumbnail frame readiness timed out")}),3e4),!d())return void clearTimeout(u.timer);const f=!n||t.readyState>=2;d()&&(f?s():t.onloadeddata=s)}}function d(e,t){const n=function(e){const t=document.createElement("video");e.own(()=>t.remove()),e.own(()=>t.load()),e.own(()=>t.removeAttribute("src")),e.own(()=>t.pause());for(const n of["onloadedmetadata","onloadeddata","onseeked","onerror"])e.own(()=>{t[n]=null});return e.active()?(t.crossOrigin="anonymous",t.muted=!0,t.playsInline=!0,t.tabIndex=-1,t.setAttribute("aria-hidden","true"),t.style.cssText="position:fixed;left:0;top:0;visibility:hidden;pointer-events:none;display:block;width:auto;height:auto;max-width:none;max-height:none",document.documentElement.appendChild(t),e.active()||t.remove(),t):t}(e);e.active()&&(n.onerror=e.guard(()=>{throw n.error||new Error("Auto-thumbnail media failed to load")}),n.onloadedmetadata=e.guard(()=>{n.onloadedmetadata=null;const r=n.duration,i=n.videoHeight,o=n.videoWidth,{height:a,canvasWidth:d,canvasHeight:l}=function(e,t){if(!Number.isFinite(t.duration)||t.duration<=0||!Number.isFinite(t.videoWidth)||t.videoWidth<=0||!Number.isFinite(t.videoHeight)||t.videoHeight<=0)throw new TypeError("Auto-thumbnail requires finite media duration and dimensions");const n=Math.floor(e.width*t.videoHeight/t.videoWidth),r=Math.trunc(10*e.width),i=Math.trunc(n*Math.ceil(e.number/10));if(![n,r,i].every(e=>Number.isSafeInteger(e)&&e>0&&e<=4294967295))throw new RangeError("Auto-thumbnail canvas dimensions are invalid");return{height:n,canvasWidth:r,canvasHeight:i}}(t,{duration:r,videoHeight:i,videoWidth:o});if(!e.active())return;n.width=o,n.height=i,n.style.width=`${o}px`,n.style.height=`${i}px`;const c=document.createElement("canvas");if(!e.active())return;c.width=d,c.height=l;const s=c.getContext("2d");if(!s)throw new Error("Auto-thumbnail canvas context is unavaLine truncated

docs/compiled/artplayer-plugin-auto-thumbnail.mjs

@@ -25,7 +25,7 @@ function createSession(publish, report) {
   let lastUrl;
   const urls = /* @__PURE__ */ new Set();
   function release(url) {
-    if (urls.delete(url))
+    if (url !== void 0 && urls.delete(url))
       URL.revokeObjectURL(url);
   }
   function cancel() {
@@ -103,7 +103,7 @@ function createSession(publish, report) {
           publish({ url, ...config });
         } catch (error) {
           if (lastUrl === url)
-            lastUrl = urls.has(previousUrl) ? previousUrl : void 0;
+            lastUrl = previousUrl !== void 0 && urls.has(previousUrl) ? previousUrl : void 0;
           const result = cleanupAll([() => release(url)]);
           if (result.failed)
             report(result.failure);
@@ -136,7 +136,10 @@ function createFrameReader(job, video) {
     if (!previous)
       return;
     const result = cleanupAll([
-      () => clearTimeout(previous.timer),
+      () => {
+        if (previous.timer !== null)
+          clearTimeout(previous.timer);
+      },
       () => {
         if (previous.frame !== null)
           video.cancelVideoFrameCallback(previous.frame);
@@ -360,7 +363,8 @@ function artplayerPluginAutoThumbnail(option) {
         report(result.failure);
     };
     try {
-      for (const [name, callback] of [["destroy", onDestroy], ["restart", session.cancel], ["video:loadedmetadata", onMetadata]]) {
+      const events = [["destroy", onDestroy], ["restart", session.cancel], ["video:loadedmetadata", onMetadata]];
+      for (const [name, callback] of events) {
         if (session.closed)
           break;
         subscriptions.push(() => art.off(name, callback));

packages/artplayer-plugin-auto-thumbnail/.npmignore

@@ -2,4 +2,5 @@ node_modules
 .DS_Store
 yarn.lock
 package-lock.json
-src
+src
+tsconfig.json

packages/artplayer-plugin-auto-thumbnail/ARCHITECTURE.md

@@ -7,39 +7,42 @@ for video processing.
 
 ## Modules and ownership
 
-- `src/index.js` owns ArtPlayer subscriptions and the public factory. Options are
+- `src/index.ts` owns ArtPlayer subscriptions and the public factory. Options are
   read at each `video:loadedmetadata` event, including subsequent changes to the
   original options object. `restart` cancels the old decoder immediately. `destroy`
   closes the session and removes subscriptions. Partial registration is rolled back.
-- `src/options.js` preserves truthy defaults and computes the ten-column layout.
+- `src/options.ts` preserves truthy defaults and computes the ten-column layout.
   Coercible numeric JS inputs and fractional frame counts retain their previous
   behavior; raw option values are forwarded to the thumbnail configuration.
   Invalid/nonfinite dimensions fail before canvas allocation. Canvas dimensions
   are checked against integer/IDL bounds, not a universal memory budget.
-- `src/session.js` owns one active extraction job and the generated object URLs.
+- `src/session.ts` owns one active extraction job and the generated object URLs.
   Guards prevent obsolete callbacks from publishing or scheduling another frame.
   Cleanup runs all registered actions even if one fails. Installing a replacement
   before cleaning up its predecessor makes synchronous host reentry observable.
-- `src/extraction.js` owns the private video and canvas, metadata/seek/error
+- `src/extraction.ts` owns the private video and canvas, metadata/seek/error
   handlers, and the frame/encode sequence. Each valid draw is encoded before the
   next seek. The final decoder is paused, cleared and reset; the final sheet URL
   remains owned by the session until another usable sheet replaces it or destroy.
-- `src/video.js` creates and owns the hidden media element. It is attached to the
+- `src/video.ts` creates and owns the hidden media element. It is attached to the
   document root because detached media loses drawable pixels on Windows WebKit.
   `visibility:hidden` preserves its rendered box; `display:none` and a 1px box do
   not. Metadata locks the box to intrinsic dimensions, overriding ordinary global
   video sizing rules. It is silent, excluded from focus/accessibility, and never
   played by this implementation. Cleanup also removes the element if insertion,
   cancellation, pause or decoder reset fails.
-- `src/frames.js` owns one pending sample, its seek/data handlers, deadline and
+- `src/frames.ts` owns one pending sample, its seek/data handlers, deadline and
   native presentation callback. When request/cancel frame callbacks are both
   available it waits for loaded data, then requires both seek completion and frame
   presentation before drawing. Callback identities are invalidated on retry and
   replacement; late/duplicate delivery cannot complete a newer sample. One job
   cleanup handles every frame without accumulating per-frame cleanup closures.
+- `src/types.ts` defines internal configuration, sheet data, the minimal host and
+  guarded extraction-job callbacks. `guard` retains argument/result types and the
+  inactive undefined result. No public declarations are generated from this file.
 
 Only the entry module receives ArtPlayer. Extraction receives a guarded job and a
-  configuration snapshot. These internal modules do not add public player fields,
+configuration snapshot. These internal modules do not add public player fields,
 plugin methods, or a dependency on a particular core implementation.
 
 ## Compatibility and intentional fixes
@@ -80,6 +83,7 @@ Use the root Yarn toolchain:
 
 ```sh
 yarn test:auto-thumbnail
+yarn exec tsc -p packages/artplayer-plugin-auto-thumbnail/tsconfig.json --noEmit
 yarn test:browser test/browser/auto-thumbnail-lifecycle.spec.js
 yarn test:browser test/browser/auto-thumbnail-pixels.spec.js
 yarn build artplayer-plugin-auto-thumbnail
@@ -109,9 +113,18 @@ red, black, blue and yellow sections. Its command and fingerprint are in
 directory with `ARTPLAYER_FFMPEG` and `node scripts/generate-auto-thumbnail-fixture.mjs
 <new-directory>`; never silently replace the committed fixture.
 
-Task04 converts these modules to strict TypeScript and resolves historical public
-declaration/CommonJS differences. Task05 verifies old/final cores and actual
+Task03's internal-type checkpoint has converted the six runtime modules to strict
+TypeScript. Numeric annotations describe the nominal options; no runtime casts or
+normalization were added, so historical coercible JS inputs retain the same
+validation/arithmetic and raw values. Missing options retain the existing behavior.
+Task04 still resolves public declarations, implementation-to-consumer contracts and
+historical CommonJS differences. Task05 verifies old/final cores and actual
 devices; task06 covers installed package entries and the real demo/editor. The
 types and package version are unchanged at this checkpoint. Use
 `refactor/baselines/auto-thumbnail-contract.md` and `auto-thumbnail-failures.md` as
 the historical evidence map; do not regenerate those baselines from this source.
+
+The internal type checkpoint and its core-host assignment fixture are recorded in
+`refactor/changes/2026-09-13-PKG-AUTO-THUMB-03-internal-types.md`. A core host can
+hold partial user thumbnail options; extraction publishes a complete sheet. Do not
+require the host's existing getter to have every generated-sheet field.

packages/artplayer-plugin-auto-thumbnail/dist/artplayer-plugin-auto-thumbnail.js

@@ -4,4 +4,4 @@
  * (c) 2017-2026 Harvey Zhao
  * Released under the MIT License.
  */
-!function(e,t){"object"===typeof exports&&"undefined"!==typeof module?module.exports=t():"function"==typeof define&&define.amd?(e.artplayerPluginAutoThumbnail=t(),define(function(){return e.artplayerPluginAutoThumbnail})):(e="undefined"!==typeof globalThis?globalThis:e||self).artplayerPluginAutoThumbnail=t()}(this,function(){"use strict";function e(e){let t,n=!1;for(const r of e)try{r()}catch(i){n||(n=!0,t=i)}return{failed:n,failure:t}}function t(t,n){const i="function"===typeof n.requestVideoFrameCallback&&"function"===typeof n.cancelVideoFrameCallback;let r;function o(){const t=r;if(r=void 0,n.onloadeddata=null,n.onseeked=null,!t)return;const i=e([()=>clearTimeout(t.timer),()=>{null!==t.frame&&n.cancelVideoFrameCallback(t.frame)}]);if(i.failed)throw i.failure}return t.own(o),(e,a)=>{if(o(),!t.active())return;const u={frame:null,timer:null,sought:!1,presented:!i,retries:0,sequence:0,started:!1};r=u;const d=()=>t.active()&&r===u,s=t.guard(()=>{d()&&u.sought&&u.presented&&(o(),t.active()&&a())}),c=()=>{u.sought=!1,(()=>{if(!i)return;const e=++u.sequence;u.presented=!1;const r=u.frame;if(u.frame=null,null!==r&&n.cancelVideoFrameCallback(r),!d())return;let o=!1;const a=n.requestVideoFrameCallback(t.guard(()=>{d()&&e===u.sequence&&!o&&(o=!0,u.frame=null,u.presented=!0,s())}));d()&&e===u.sequence&&!o?u.frame=a:n.cancelVideoFrameCallback(a)})(),d()&&(n.currentTime=e)},l=t.guard(()=>{d()&&!u.started&&(u.started=!0,n.onloadeddata=null,n.onseeked=t.guard(()=>{if(!d()||n.seeking)return;const t=n.currentTime;if(d())if(!Number.isFinite(t)||Math.abs(t-e)>.05){if(++u.retries>3)throw new Error("Auto-thumbnail seek did not reach the requested time");c()}else u.sought=!0,s()}),c())});if(u.timer=setTimeout(t.guard(()=>{if(d())throw new Error("Auto-thumbnail frame readiness timed out")}),3e4),!d())return void clearTimeout(u.timer);const f=!i||n.readyState>=2;d()&&(f?l():n.onloadeddata=l)}}function n(e,n){const i=function(e){const t=document.createElement("video");e.own(()=>t.remove()),e.own(()=>t.load()),e.own(()=>t.removeAttribute("src")),e.own(()=>t.pause());for(const n of["onloadedmetadata","onloadeddata","onseeked","onerror"])e.own(()=>{t[n]=null});return e.active()?(t.crossOrigin="anonymous",t.muted=!0,t.playsInline=!0,t.tabIndex=-1,t.setAttribute("aria-hidden","true"),t.style.cssText="position:fixed;left:0;top:0;visibility:hidden;pointer-events:none;display:block;width:auto;height:auto;max-width:none;max-height:none",document.documentElement.appendChild(t),e.active()||t.remove(),t):t}(e);e.active()&&(i.onerror=e.guard(()=>{throw i.error||new Error("Auto-thumbnail media failed to load")}),i.onloadedmetadata=e.guard(()=>{i.onloadedmetadata=null;const r=i.duration,o=i.videoHeight,a=i.videoWidth,{height:u,canvasWidth:d,canvasHeight:s}=function(e,t){if(!Number.isFinite(t.duration)||t.duration<=0||!Number.isFinite(t.videoWidth)||t.videoWidth<=0||!Number.isFinite(t.videoHeight)||t.videoHeight<=0)throw new TypeError("Auto-thumbnail requires finite media duration and dimensions");const n=Math.floor(e.width*t.videoHeight/t.videoWidth),i=Math.trunc(10*e.width),r=Math.trunc(n*Math.ceil(e.number/10));if(![n,i,r].every(e=>Number.isSafeInteger(e)&&e>0&&e<=4294967295))throw new RangeError("Auto-thumbnail canvas dimensions are invalid");return{height:n,canvasWidth:i,canvasHeight:r}}(n,{duration:r,videoHeight:o,videoWidth:a});if(!e.active())return;i.width=a,i.height=o,i.style.width=`${a}px`,i.style.height=`${o}px`;const c=document.createElement("canvas");if(!e.active())return;c.width=d,c.height=s;const l=c.getContext("2d");if(!l)throw new Error("Auto-thumbnail canvas context is unavailable");if(!e.active())return;const f=t(e,i);let h=0;const m=e.guard(()=>{h>=n.number?e.dispose():f(r*h/n.number,e.guard(()=>{if(l.drawImage(i,h%10*n.width,Math.floor(h/10)*u,n.width,u),!e.active())return;let t=!1;c.toBlob(e.guard(i=>{t||(t=!0,e.publish(i,{height:u,column:10,number:n.number,width:n.width,scale:n.scale}),e.active()&&(h+=1,m()))}),"image/jpeg")}))});m()}),e.active()&&(i.src=n.url))}return function(t){return async i=>{const r=e=>console.warn("ArtPlayer auto-thumbnail failed:",e),o=function(t,n){let i,r,o=!1;const a=new Set;function u(e){a.delete(e)&&URL.revokeObjectURL(e)}function d(){const e=i;i=void 0,e?.dispose()}return{start:function(){if(o)return;const d=i,s=[];let c=!1;const l={active:()=>!o&&!c&&i===l,own(t){if(c){const i=e([t]);i.failed&&n(i.failure)}else s.push(t)},dispose(){if(c)return;c=!0,i===l&&(i=void 0);const t=e(s.splice(0).reverse());t.failed&&n(t.failure)},fail(e){l.active()&&(l.dispose(),n(e))},guard:e=>(...t)=>{if(l.active())try{return e(...t)}catch(n){l.fail(n)}},publish(i,o){if(!l.active())return;if(!i)throw new Error("Auto-thumbnail encoding returned no Blob");const d=URL.createObjectURL(i);if(a.add(d),!l.active())return void u(d);const s=r;r=d;try{t({url:d,...o})}catch(c){r===d&&(r=a.has(s)?s:void 0);const t=e([()=>u(d)]);throw t.failed&&n(t.failure),c}u(s)}};return i=l,d?.dispose(),l},cancel:d,destroy:function(){if(o)rLine truncated
+!function(e,t){"object"===typeof exports&&"undefined"!==typeof module?module.exports=t():"function"==typeof define&&define.amd?(e.artplayerPluginAutoThumbnail=t(),define(function(){return e.artplayerPluginAutoThumbnail})):(e="undefined"!==typeof globalThis?globalThis:e||self).artplayerPluginAutoThumbnail=t()}(this,function(){"use strict";function e(e){let t,n=!1;for(const r of e)try{r()}catch(i){n||(n=!0,t=i)}return{failed:n,failure:t}}function t(t,n){const i="function"===typeof n.requestVideoFrameCallback&&"function"===typeof n.cancelVideoFrameCallback;let r;function o(){const t=r;if(r=void 0,n.onloadeddata=null,n.onseeked=null,!t)return;const i=e([()=>{null!==t.timer&&clearTimeout(t.timer)},()=>{null!==t.frame&&n.cancelVideoFrameCallback(t.frame)}]);if(i.failed)throw i.failure}return t.own(o),(e,a)=>{if(o(),!t.active())return;const u={frame:null,timer:null,sought:!1,presented:!i,retries:0,sequence:0,started:!1};r=u;const d=()=>t.active()&&r===u,s=t.guard(()=>{d()&&u.sought&&u.presented&&(o(),t.active()&&a())}),c=()=>{u.sought=!1,(()=>{if(!i)return;const e=++u.sequence;u.presented=!1;const r=u.frame;if(u.frame=null,null!==r&&n.cancelVideoFrameCallback(r),!d())return;let o=!1;const a=n.requestVideoFrameCallback(t.guard(()=>{d()&&e===u.sequence&&!o&&(o=!0,u.frame=null,u.presented=!0,s())}));d()&&e===u.sequence&&!o?u.frame=a:n.cancelVideoFrameCallback(a)})(),d()&&(n.currentTime=e)},l=t.guard(()=>{d()&&!u.started&&(u.started=!0,n.onloadeddata=null,n.onseeked=t.guard(()=>{if(!d()||n.seeking)return;const t=n.currentTime;if(d())if(!Number.isFinite(t)||Math.abs(t-e)>.05){if(++u.retries>3)throw new Error("Auto-thumbnail seek did not reach the requested time");c()}else u.sought=!0,s()}),c())});if(u.timer=setTimeout(t.guard(()=>{if(d())throw new Error("Auto-thumbnail frame readiness timed out")}),3e4),!d())return void clearTimeout(u.timer);const f=!i||n.readyState>=2;d()&&(f?l():n.onloadeddata=l)}}function n(e,n){const i=function(e){const t=document.createElement("video");e.own(()=>t.remove()),e.own(()=>t.load()),e.own(()=>t.removeAttribute("src")),e.own(()=>t.pause());for(const n of["onloadedmetadata","onloadeddata","onseeked","onerror"])e.own(()=>{t[n]=null});return e.active()?(t.crossOrigin="anonymous",t.muted=!0,t.playsInline=!0,t.tabIndex=-1,t.setAttribute("aria-hidden","true"),t.style.cssText="position:fixed;left:0;top:0;visibility:hidden;pointer-events:none;display:block;width:auto;height:auto;max-width:none;max-height:none",document.documentElement.appendChild(t),e.active()||t.remove(),t):t}(e);e.active()&&(i.onerror=e.guard(()=>{throw i.error||new Error("Auto-thumbnail media failed to load")}),i.onloadedmetadata=e.guard(()=>{i.onloadedmetadata=null;const r=i.duration,o=i.videoHeight,a=i.videoWidth,{height:u,canvasWidth:d,canvasHeight:s}=function(e,t){if(!Number.isFinite(t.duration)||t.duration<=0||!Number.isFinite(t.videoWidth)||t.videoWidth<=0||!Number.isFinite(t.videoHeight)||t.videoHeight<=0)throw new TypeError("Auto-thumbnail requires finite media duration and dimensions");const n=Math.floor(e.width*t.videoHeight/t.videoWidth),i=Math.trunc(10*e.width),r=Math.trunc(n*Math.ceil(e.number/10));if(![n,i,r].every(e=>Number.isSafeInteger(e)&&e>0&&e<=4294967295))throw new RangeError("Auto-thumbnail canvas dimensions are invalid");return{height:n,canvasWidth:i,canvasHeight:r}}(n,{duration:r,videoHeight:o,videoWidth:a});if(!e.active())return;i.width=a,i.height=o,i.style.width=`${a}px`,i.style.height=`${o}px`;const c=document.createElement("canvas");if(!e.active())return;c.width=d,c.height=s;const l=c.getContext("2d");if(!l)throw new Error("Auto-thumbnail canvas context is unavailable");if(!e.active())return;const f=t(e,i);let h=0;const m=e.guard(()=>{h>=n.number?e.dispose():f(r*h/n.number,e.guard(()=>{if(l.drawImage(i,h%10*n.width,Math.floor(h/10)*u,n.width,u),!e.active())return;let t=!1;c.toBlob(e.guard(i=>{t||(t=!0,e.publish(i,{height:u,column:10,number:n.number,width:n.width,scale:n.scale}),e.active()&&(h+=1,m()))}),"image/jpeg")}))});m()}),e.active()&&(i.src=n.url))}return function(t){return async i=>{const r=e=>console.warn("ArtPlayer auto-thumbnail failed:",e),o=function(t,n){let i,r,o=!1;const a=new Set;function u(e){void 0!==e&&a.delete(e)&&URL.revokeObjectURL(e)}function d(){const e=i;i=void 0,e?.dispose()}return{start:function(){if(o)return;const d=i,s=[];let c=!1;const l={active:()=>!o&&!c&&i===l,own(t){if(c){const i=e([t]);i.failed&&n(i.failure)}else s.push(t)},dispose(){if(c)return;c=!0,i===l&&(i=void 0);const t=e(s.splice(0).reverse());t.failed&&n(t.failure)},fail(e){l.active()&&(l.dispose(),n(e))},guard:e=>(...t)=>{if(l.active())try{return e(...t)}catch(n){l.fail(n)}},publish(i,o){if(!l.active())return;if(!i)throw new Error("Auto-thumbnail encoding returned no Blob");const d=URL.createObjectURL(i);if(a.add(d),!l.active())return void u(d);const s=r;r=d;try{t({url:d,...o})}catch(c){r===d&&(r=void 0!==s&&a.has(s)?s:void 0);const t=e([()=>u(d)]);throw t.failed&&n(t.failure),c}u(s)}};return i=l,d?.dispoLine truncated

packages/artplayer-plugin-auto-thumbnail/dist/artplayer-plugin-auto-thumbnail.legacy.js

@@ -4,4 +4,4 @@
  * (c) 2017-2026 Harvey Zhao
  * Released under the MIT License.
  */
-!function(e,t){"object"===typeof exports&&"undefined"!==typeof module?module.exports=t():"function"==typeof define&&define.amd?(e.artplayerPluginAutoThumbnail=t(),define(function(){return e.artplayerPluginAutoThumbnail})):(e="undefined"!==typeof globalThis?globalThis:e||self).artplayerPluginAutoThumbnail=t()}(this,function(){"use strict";var e=Object.defineProperty,t=Object.getOwnPropertySymbols,n=Object.prototype.hasOwnProperty,r=Object.prototype.propertyIsEnumerable,i=(t,n,r)=>n in t?e(t,n,{enumerable:!0,configurable:!0,writable:!0,value:r}):t[n]=r;function o(e){let t,n=!1;for(const i of e)try{i()}catch(r){n||(n=!0,t=r)}return{failed:n,failure:t}}function a(e,a){let u,d,l=!1;const c=new Set;function s(e){c.delete(e)&&URL.revokeObjectURL(e)}function f(){const e=u;u=void 0,null==e||e.dispose()}return{start:function(){if(l)return;const f=u,h=[];let m=!1;const b={active:()=>!l&&!m&&u===b,own(e){if(m){const t=o([e]);t.failed&&a(t.failure)}else h.push(e)},dispose(){if(m)return;m=!0,u===b&&(u=void 0);const e=o(h.splice(0).reverse());e.failed&&a(e.failure)},fail(e){b.active()&&(b.dispose(),a(e))},guard:e=>(...t)=>{if(b.active())try{return e(...t)}catch(n){b.fail(n)}},publish(u,l){if(!b.active())return;if(!u)throw new Error("Auto-thumbnail encoding returned no Blob");const f=URL.createObjectURL(u);if(c.add(f),!b.active())return void s(f);const h=d;d=f;try{e(((e,o)=>{for(var a in o||(o={}))n.call(o,a)&&i(e,a,o[a]);if(t)for(var a of t(o))r.call(o,a)&&i(e,a,o[a]);return e})({url:f},l))}catch(m){d===f&&(d=c.has(h)?h:void 0);const e=o([()=>s(f)]);throw e.failed&&a(e.failure),m}s(h)}};return u=b,null==f||f.dispose(),b},cancel:f,destroy:function(){if(l)return;l=!0;const e=o([f,...[...c].map(e=>()=>s(e))]);d=void 0,e.failed&&a(e.failure)},get closed(){return l}}}function u(e,t){const n="function"===typeof t.requestVideoFrameCallback&&"function"===typeof t.cancelVideoFrameCallback;let r;function i(){const e=r;if(r=void 0,t.onloadeddata=null,t.onseeked=null,!e)return;const n=o([()=>clearTimeout(e.timer),()=>{null!==e.frame&&t.cancelVideoFrameCallback(e.frame)}]);if(n.failed)throw n.failure}return e.own(i),(o,a)=>{if(i(),!e.active())return;const u={frame:null,timer:null,sought:!1,presented:!n,retries:0,sequence:0,started:!1};r=u;const d=()=>e.active()&&r===u,l=e.guard(()=>{d()&&u.sought&&u.presented&&(i(),e.active()&&a())}),c=()=>{u.sought=!1,(()=>{if(!n)return;const r=++u.sequence;u.presented=!1;const i=u.frame;if(u.frame=null,null!==i&&t.cancelVideoFrameCallback(i),!d())return;let o=!1;const a=t.requestVideoFrameCallback(e.guard(()=>{d()&&r===u.sequence&&!o&&(o=!0,u.frame=null,u.presented=!0,l())}));d()&&r===u.sequence&&!o?u.frame=a:t.cancelVideoFrameCallback(a)})(),d()&&(t.currentTime=o)},s=e.guard(()=>{d()&&!u.started&&(u.started=!0,t.onloadeddata=null,t.onseeked=e.guard(()=>{if(!d()||t.seeking)return;const e=t.currentTime;if(d())if(!Number.isFinite(e)||Math.abs(e-o)>.05){if(++u.retries>3)throw new Error("Auto-thumbnail seek did not reach the requested time");c()}else u.sought=!0,l()}),c())});if(u.timer=setTimeout(e.guard(()=>{if(d())throw new Error("Auto-thumbnail frame readiness timed out")}),3e4),!d())return void clearTimeout(u.timer);const f=!n||t.readyState>=2;d()&&(f?s():t.onloadeddata=s)}}function d(e,t){const n=function(e){const t=document.createElement("video");e.own(()=>t.remove()),e.own(()=>t.load()),e.own(()=>t.removeAttribute("src")),e.own(()=>t.pause());for(const n of["onloadedmetadata","onloadeddata","onseeked","onerror"])e.own(()=>{t[n]=null});return e.active()?(t.crossOrigin="anonymous",t.muted=!0,t.playsInline=!0,t.tabIndex=-1,t.setAttribute("aria-hidden","true"),t.style.cssText="position:fixed;left:0;top:0;visibility:hidden;pointer-events:none;display:block;width:auto;height:auto;max-width:none;max-height:none",document.documentElement.appendChild(t),e.active()||t.remove(),t):t}(e);e.active()&&(n.onerror=e.guard(()=>{throw n.error||new Error("Auto-thumbnail media failed to load")}),n.onloadedmetadata=e.guard(()=>{n.onloadedmetadata=null;const r=n.duration,i=n.videoHeight,o=n.videoWidth,{height:a,canvasWidth:d,canvasHeight:l}=function(e,t){if(!Number.isFinite(t.duration)||t.duration<=0||!Number.isFinite(t.videoWidth)||t.videoWidth<=0||!Number.isFinite(t.videoHeight)||t.videoHeight<=0)throw new TypeError("Auto-thumbnail requires finite media duration and dimensions");const n=Math.floor(e.width*t.videoHeight/t.videoWidth),r=Math.trunc(10*e.width),i=Math.trunc(n*Math.ceil(e.number/10));if(![n,r,i].every(e=>Number.isSafeInteger(e)&&e>0&&e<=4294967295))throw new RangeError("Auto-thumbnail canvas dimensions are invalid");return{height:n,canvasWidth:r,canvasHeight:i}}(t,{duration:r,videoHeight:i,videoWidth:o});if(!e.active())return;n.width=o,n.height=i,n.style.width=`${o}px`,n.style.height=`${i}px`;const c=document.createElement("canvas");if(!e.active())return;c.width=d,c.height=l;const s=c.getContext("2d");if(!s)throw new Error("Auto-thumbnail canvas context is unavailable");if(!e.active())return;const f=u(eLine truncated
+!function(e,t){"object"===typeof exports&&"undefined"!==typeof module?module.exports=t():"function"==typeof define&&define.amd?(e.artplayerPluginAutoThumbnail=t(),define(function(){return e.artplayerPluginAutoThumbnail})):(e="undefined"!==typeof globalThis?globalThis:e||self).artplayerPluginAutoThumbnail=t()}(this,function(){"use strict";var e=Object.defineProperty,t=Object.getOwnPropertySymbols,n=Object.prototype.hasOwnProperty,r=Object.prototype.propertyIsEnumerable,i=(t,n,r)=>n in t?e(t,n,{enumerable:!0,configurable:!0,writable:!0,value:r}):t[n]=r;function o(e){let t,n=!1;for(const i of e)try{i()}catch(r){n||(n=!0,t=r)}return{failed:n,failure:t}}function a(e,a){let u,d,l=!1;const c=new Set;function s(e){void 0!==e&&c.delete(e)&&URL.revokeObjectURL(e)}function f(){const e=u;u=void 0,null==e||e.dispose()}return{start:function(){if(l)return;const f=u,h=[];let m=!1;const v={active:()=>!l&&!m&&u===v,own(e){if(m){const t=o([e]);t.failed&&a(t.failure)}else h.push(e)},dispose(){if(m)return;m=!0,u===v&&(u=void 0);const e=o(h.splice(0).reverse());e.failed&&a(e.failure)},fail(e){v.active()&&(v.dispose(),a(e))},guard:e=>(...t)=>{if(v.active())try{return e(...t)}catch(n){v.fail(n)}},publish(u,l){if(!v.active())return;if(!u)throw new Error("Auto-thumbnail encoding returned no Blob");const f=URL.createObjectURL(u);if(c.add(f),!v.active())return void s(f);const h=d;d=f;try{e(((e,o)=>{for(var a in o||(o={}))n.call(o,a)&&i(e,a,o[a]);if(t)for(var a of t(o))r.call(o,a)&&i(e,a,o[a]);return e})({url:f},l))}catch(m){d===f&&(d=void 0!==h&&c.has(h)?h:void 0);const e=o([()=>s(f)]);throw e.failed&&a(e.failure),m}s(h)}};return u=v,null==f||f.dispose(),v},cancel:f,destroy:function(){if(l)return;l=!0;const e=o([f,...[...c].map(e=>()=>s(e))]);d=void 0,e.failed&&a(e.failure)},get closed(){return l}}}function u(e,t){const n="function"===typeof t.requestVideoFrameCallback&&"function"===typeof t.cancelVideoFrameCallback;let r;function i(){const e=r;if(r=void 0,t.onloadeddata=null,t.onseeked=null,!e)return;const n=o([()=>{null!==e.timer&&clearTimeout(e.timer)},()=>{null!==e.frame&&t.cancelVideoFrameCallback(e.frame)}]);if(n.failed)throw n.failure}return e.own(i),(o,a)=>{if(i(),!e.active())return;const u={frame:null,timer:null,sought:!1,presented:!n,retries:0,sequence:0,started:!1};r=u;const d=()=>e.active()&&r===u,l=e.guard(()=>{d()&&u.sought&&u.presented&&(i(),e.active()&&a())}),c=()=>{u.sought=!1,(()=>{if(!n)return;const r=++u.sequence;u.presented=!1;const i=u.frame;if(u.frame=null,null!==i&&t.cancelVideoFrameCallback(i),!d())return;let o=!1;const a=t.requestVideoFrameCallback(e.guard(()=>{d()&&r===u.sequence&&!o&&(o=!0,u.frame=null,u.presented=!0,l())}));d()&&r===u.sequence&&!o?u.frame=a:t.cancelVideoFrameCallback(a)})(),d()&&(t.currentTime=o)},s=e.guard(()=>{d()&&!u.started&&(u.started=!0,t.onloadeddata=null,t.onseeked=e.guard(()=>{if(!d()||t.seeking)return;const e=t.currentTime;if(d())if(!Number.isFinite(e)||Math.abs(e-o)>.05){if(++u.retries>3)throw new Error("Auto-thumbnail seek did not reach the requested time");c()}else u.sought=!0,l()}),c())});if(u.timer=setTimeout(e.guard(()=>{if(d())throw new Error("Auto-thumbnail frame readiness timed out")}),3e4),!d())return void clearTimeout(u.timer);const f=!n||t.readyState>=2;d()&&(f?s():t.onloadeddata=s)}}function d(e,t){const n=function(e){const t=document.createElement("video");e.own(()=>t.remove()),e.own(()=>t.load()),e.own(()=>t.removeAttribute("src")),e.own(()=>t.pause());for(const n of["onloadedmetadata","onloadeddata","onseeked","onerror"])e.own(()=>{t[n]=null});return e.active()?(t.crossOrigin="anonymous",t.muted=!0,t.playsInline=!0,t.tabIndex=-1,t.setAttribute("aria-hidden","true"),t.style.cssText="position:fixed;left:0;top:0;visibility:hidden;pointer-events:none;display:block;width:auto;height:auto;max-width:none;max-height:none",document.documentElement.appendChild(t),e.active()||t.remove(),t):t}(e);e.active()&&(n.onerror=e.guard(()=>{throw n.error||new Error("Auto-thumbnail media failed to load")}),n.onloadedmetadata=e.guard(()=>{n.onloadedmetadata=null;const r=n.duration,i=n.videoHeight,o=n.videoWidth,{height:a,canvasWidth:d,canvasHeight:l}=function(e,t){if(!Number.isFinite(t.duration)||t.duration<=0||!Number.isFinite(t.videoWidth)||t.videoWidth<=0||!Number.isFinite(t.videoHeight)||t.videoHeight<=0)throw new TypeError("Auto-thumbnail requires finite media duration and dimensions");const n=Math.floor(e.width*t.videoHeight/t.videoWidth),r=Math.trunc(10*e.width),i=Math.trunc(n*Math.ceil(e.number/10));if(![n,r,i].every(e=>Number.isSafeInteger(e)&&e>0&&e<=4294967295))throw new RangeError("Auto-thumbnail canvas dimensions are invalid");return{height:n,canvasWidth:r,canvasHeight:i}}(t,{duration:r,videoHeight:i,videoWidth:o});if(!e.active())return;n.width=o,n.height=i,n.style.width=`${o}px`,n.style.height=`${i}px`;const c=document.createElement("canvas");if(!e.active())return;c.width=d,c.height=l;const s=c.getContext("2d");if(!s)throw new Error("Auto-thumbnail canvas context is unavaLine truncated

packages/artplayer-plugin-auto-thumbnail/dist/artplayer-plugin-auto-thumbnail.mjs

@@ -25,7 +25,7 @@ function createSession(publish, report) {
   let lastUrl;
   const urls = /* @__PURE__ */ new Set();
   function release(url) {
-    if (urls.delete(url))
+    if (url !== void 0 && urls.delete(url))
       URL.revokeObjectURL(url);
   }
   function cancel() {
@@ -103,7 +103,7 @@ function createSession(publish, report) {
           publish({ url, ...config });
         } catch (error) {
           if (lastUrl === url)
-            lastUrl = urls.has(previousUrl) ? previousUrl : void 0;
+            lastUrl = previousUrl !== void 0 && urls.has(previousUrl) ? previousUrl : void 0;
           const result = cleanupAll([() => release(url)]);
           if (result.failed)
             report(result.failure);
@@ -136,7 +136,10 @@ function createFrameReader(job, video) {
     if (!previous)
       return;
     const result = cleanupAll([
-      () => clearTimeout(previous.timer),
+      () => {
+        if (previous.timer !== null)
+          clearTimeout(previous.timer);
+      },
       () => {
         if (previous.frame !== null)
           video.cancelVideoFrameCallback(previous.frame);
@@ -360,7 +363,8 @@ function artplayerPluginAutoThumbnail(option) {
         report(result.failure);
     };
     try {
-      for (const [name, callback] of [["destroy", onDestroy], ["restart", session.cancel], ["video:loadedmetadata", onMetadata]]) {
+      const events = [["destroy", onDestroy], ["restart", session.cancel], ["video:loadedmetadata", onMetadata]];
+      for (const [name, callback] of events) {
         if (session.closed)
           break;
         subscriptions.push(() => art.off(name, callback));

packages/artplayer-plugin-auto-thumbnail/src/extraction.ts

@@ -1,8 +1,9 @@
+import type { ExtractionConfig, ExtractionJob } from './types'
 import createFrameReader from './frames'
 import { sheetSize } from './options'
 import createVideo from './video'
 
-export default function extract(job, config) {
+export default function extract(job: ExtractionJob, config: ExtractionConfig) {
   const video = createVideo(job)
   if (!job.active())
     return

packages/artplayer-plugin-auto-thumbnail/src/frames.ts

@@ -1,9 +1,20 @@
+import type { ExtractionJob } from './types'
 import { cleanupAll } from './session'
 
-export default function createFrameReader(job, video) {
+interface PendingFrame {
+  frame: number | null
+  timer: ReturnType<typeof setTimeout> | null
+  sought: boolean
+  presented: boolean
+  retries: number
+  sequence: number
+  started: boolean
+}
+
+export default function createFrameReader(job: ExtractionJob, video: HTMLVideoElement) {
   const presentedFrames = typeof video.requestVideoFrameCallback === 'function'
     && typeof video.cancelVideoFrameCallback === 'function'
-  let pending
+  let pending: PendingFrame | undefined
 
   function clear() {
     const previous = pending
@@ -13,7 +24,10 @@ export default function createFrameReader(job, video) {
     if (!previous)
       return
     const result = cleanupAll([
-      () => clearTimeout(previous.timer),
+      () => {
+        if (previous.timer !== null)
+          clearTimeout(previous.timer)
+      },
       () => {
         if (previous.frame !== null)
           video.cancelVideoFrameCallback(previous.frame)
@@ -24,11 +38,11 @@ export default function createFrameReader(job, video) {
   }
   job.own(clear)
 
-  return (target, draw) => {
+  return (target: number, draw: () => void) => {
     clear()
     if (!job.active())
       return
-    const current = { frame: null, timer: null, sought: false, presented: !presentedFrames, retries: 0, sequence: 0, started: false }
+    const current: PendingFrame = { frame: null, timer: null, sought: false, presented: !presentedFrames, retries: 0, sequence: 0, started: false }
     pending = current
     const active = () => job.active() && pending === current
     const finish = job.guard(() => {

packages/artplayer-plugin-auto-thumbnail/src/index.ts

@@ -1,14 +1,15 @@
+import type { Cleanup, ThumbnailHost, ThumbnailOptions } from './types'
 import extract from './extraction'
 import { readOptions } from './options'
 import createSession, { cleanupAll } from './session'
 
-export default function artplayerPluginAutoThumbnail(option) {
-  return async (art) => {
-    const report = error => console.warn('ArtPlayer auto-thumbnail failed:', error)
+export default function artplayerPluginAutoThumbnail(option: ThumbnailOptions) {
+  return async (art: ThumbnailHost) => {
+    const report = (error: unknown) => console.warn('ArtPlayer auto-thumbnail failed:', error)
     const session = createSession((config) => {
       art.thumbnails = config
     }, report)
-    const subscriptions = []
+    const subscriptions: Cleanup[] = []
     const onMetadata = () => {
       const job = session.start()
       if (job) {
@@ -26,7 +27,8 @@ export default function artplayerPluginAutoThumbnail(option) {
         report(result.failure)
     }
     try {
-      for (const [name, callback] of [['destroy', onDestroy], ['restart', session.cancel], ['video:loadedmetadata', onMetadata]]) {
+      const events: [string, Cleanup][] = [['destroy', onDestroy], ['restart', session.cancel], ['video:loadedmetadata', onMetadata]]
+      for (const [name, callback] of events) {
         if (session.closed)
           break
         subscriptions.push(() => art.off(name, callback))

packages/artplayer-plugin-auto-thumbnail/src/options.ts

@@ -1,4 +1,6 @@
-export function readOptions(option, getFallbackUrl) {
+import type { ExtractionConfig, ThumbnailOptions } from './types'
+
+export function readOptions(option: ThumbnailOptions, getFallbackUrl: () => string): ExtractionConfig {
   const config = {
     url: option.url || getFallbackUrl(),
     width: option.width || 160,
@@ -10,7 +12,7 @@ export function readOptions(option, getFallbackUrl) {
   return config
 }
 
-export function sheetSize(config, video) {
+export function sheetSize(config: ExtractionConfig, video: Pick<HTMLVideoElement, 'duration' | 'videoWidth' | 'videoHeight'>) {
   if (!Number.isFinite(video.duration) || video.duration <= 0 || !Number.isFinite(video.videoWidth) || video.videoWidth <= 0 || !Number.isFinite(video.videoHeight) || video.videoHeight <= 0)
     throw new TypeError('Auto-thumbnail requires finite media duration and dimensions')
   const height = Math.floor(config.width * video.videoHeight / video.videoWidth)

packages/artplayer-plugin-auto-thumbnail/src/session.ts

@@ -1,5 +1,7 @@
-export function cleanupAll(actions) {
-  let failure
+import type { Cleanup, ExtractionJob, ThumbnailSheet } from './types'
+
+export function cleanupAll(actions: Cleanup[]) {
+  let failure: unknown
   let failed = false
   for (const action of actions) {
     try {
@@ -15,14 +17,14 @@ export function cleanupAll(actions) {
   return { failed, failure }
 }
 
-export default function createSession(publish, report) {
+export default function createSession(publish: (sheet: ThumbnailSheet) => void, report: (error: unknown) => void) {
   let closed = false
-  let current
-  let lastUrl
-  const urls = new Set()
+  let current: ExtractionJob | undefined
+  let lastUrl: string | undefined
+  const urls = new Set<string>()
 
-  function release(url) {
-    if (urls.delete(url))
+  function release(url: string | undefined) {
+    if (url !== undefined && urls.delete(url))
       URL.revokeObjectURL(url)
   }
 
@@ -47,9 +49,9 @@ export default function createSession(publish, report) {
       return
     // Install the replacement before cleanup, which can reenter through host APIs.
     const previous = current
-    const actions = []
+    const actions: Cleanup[] = []
     let disposed = false
-    const job = {
+    const job: ExtractionJob = {
       active: () => !closed && !disposed && current === job,
       own(action) {
         if (disposed) {
@@ -107,7 +109,7 @@ export default function createSession(publish, report) {
         }
         catch (error) {
           if (lastUrl === url)
-            lastUrl = urls.has(previousUrl) ? previousUrl : undefined
+            lastUrl = previousUrl !== undefined && urls.has(previousUrl) ? previousUrl : undefined
           const result = cleanupAll([() => release(url)])
           if (result.failed)
             report(result.failure)

packages/artplayer-plugin-auto-thumbnail/src/types.ts

@@ -0,0 +1,43 @@
+// Internal contracts only. Public declarations retain their historical entrypoint.
+export interface ThumbnailOptions {
+  url?: string
+  width?: number
+  number?: number
+  scale?: number
+  height?: number
+}
+
+export interface ExtractionConfig {
+  url: string
+  width: number
+  number: number
+  scale: number
+}
+
+export interface SheetConfig {
+  height: number
+  column: number
+  number: number
+  width: number
+  scale: number
+}
+
+export interface ThumbnailSheet extends SheetConfig { url: string }
+export type Cleanup = () => void
+
+export interface ExtractionJob {
+  active: () => boolean
+  own: (action: Cleanup) => void
+  dispose: Cleanup
+  fail: (error: unknown) => void
+  guard: <Args extends unknown[], Result>(callback: (...args: Args) => Result) => (...args: Args) => Result | undefined
+  publish: (blob: Blob | null, config: SheetConfig) => void
+}
+
+export interface ThumbnailHost {
+  option: { url: string }
+  // A host may already hold a partial user configuration; generated sheets are complete.
+  thumbnails: { url: string } & Partial<SheetConfig>
+  on: (event: string, callback: Cleanup) => unknown
+  off: (event: string, callback: Cleanup) => unknown
+}

packages/artplayer-plugin-auto-thumbnail/src/video.ts

@@ -1,10 +1,12 @@
-export default function createVideo(job) {
+import type { ExtractionJob } from './types'
+
+export default function createVideo(job: ExtractionJob) {
   const video = document.createElement('video')
   job.own(() => video.remove())
   job.own(() => video.load())
   job.own(() => video.removeAttribute('src'))
   job.own(() => video.pause())
-  for (const property of ['onloadedmetadata', 'onloadeddata', 'onseeked', 'onerror'])
+  for (const property of ['onloadedmetadata', 'onloadeddata', 'onseeked', 'onerror'] as const)
     job.own(() => { video[property] = null })
   if (!job.active())
     return video

packages/artplayer-plugin-auto-thumbnail/tsconfig.json

@@ -0,0 +1,5 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": { "allowJs": false },
+  "include": ["src/**/*.ts", "../../refactor/fixtures/implementation/auto-thumbnail.ts"]
+}

refactor/changes/2026-09-13-PKG-AUTO-THUMB-03-internal-types.md

@@ -0,0 +1,42 @@
+# PKG-AUTO-THUMB-03 内部严格TS检查点
+
+本检查点推进内部代码维护，03仍doing；公开声明和类型分发仍属04。没有降低
+首帧像素要求，也没有将WebKit的早期帧诊断计入完整像素验收。
+
+## 改动
+
+原有六个职责模块index/options/session/extraction/video/frames迁为TS，新增types.ts
+集中描述任务所有权、guard参数/返回、完整图集配置和最小宿主。新增分包严格配置，
+不启用allowJs/skipLibCheck，不引入any兜底；沿用现有构建的JS/TS共存能力。
+公开types/、入口/版本/依赖不变，注册仍为异步Promise，抽帧在后续metadata进行。
+分包tsconfig仅用于仓库实施检查，加入.npmignore，避免发布引用仓库外fixture的配置。
+
+数字字段只作名义类型标注，没有加入运行时归一化、转换或额外getter读取；旧JS
+可转换字符串/小数输入、原始width/number/scale向宿主转交及读取时序继续由既有
+用例保护。URL集合不接受undefined，timer清理排除尚未取得的null句柄；有效0
+句柄和取消中重入保持原有行为。
+
+新增真正使用核心公开Artplayer类型的源码接入fixture。最初最小宿主错误要求
+已存在的thumbnails配置所有字段必填，编译报TS2345（height可为undefined）。
+修正为宿主允许既有部分配置，而job.publish产出的ThumbnailSheet仍完整必填；
+最终分包严格检查包含该fixture并通过。没有修改核心或插件公开声明来迁就内部类型。
+
+## 验证与限制
+
+源码联合154项通过，其中52项当前生命周期/帧读取、102项历史契约与缺陷记录；
+main/legacy各52项候选单测通过。源码/main/legacy各21共63项浏览器通过，0重试/
+跳过；有原生帧回调时五格像素严格断言，无回调路径的前两格仍是诊断，不关闭
+AUTO-THUMB-PIXEL-01。三格式正常构建和docs副本一致。新源码lint及分包严格TS通过。
+Yarn实际pack的七个文件通过分发入口检查，无src或tsconfig泄漏；此检查不替代安装消费验收。
+全仓类型流程通过398个生产TS及旧/新编译器消费者；其后新增的最终宿主接入fixture
+又由分包严格检查单独验证。完整插件公开声明/安装包兼容仍待04及后续分发任务。
+
+重跑：`yarn test:auto-thumbnail`、
+`yarn exec tsc -p packages/artplayer-plugin-auto-thumbnail/tsconfig.json --noEmit`、
+`yarn build artplayer-plugin-auto-thumbnail`；浏览器运行
+`yarn test:browser test/browser/auto-thumbnail-lifecycle.spec.js test/browser/auto-thumbnail-pixels.spec.js --workers=2`。
+以ARTPLAYER_AUTO_THUMBNAIL_ARTIFACT逐个选择main/legacy，必须等待终态并归档报告。
+机器结果见[内部TS证据](../baselines/auto-thumbnail-internal-types.json)。
+
+03继续处理缺少原生帧回调时的首帧和其余资源边界；Mask03同时进行但文件和提交
+独立。本检查点可回退六个模块和新增类型/config/fixture，再正常构建；不推送或发布。

refactor/fixtures/implementation/auto-thumbnail.ts

@@ -0,0 +1,6 @@
+import type Artplayer from 'artplayer'
+import factory from '../../../packages/artplayer-plugin-auto-thumbnail/src'
+
+declare const art: Artplayer
+const registration: Promise<{ name: string }> = factory({ width: 80, number: 5 })(art)
+export { registration }

refactor/progress.md

@@ -1,5 +1,14 @@
 # 进度与证据
 
+## PKG-AUTO-THUMB-03 内部TS检查点（仍doing）
+
+六个抽帧/会话/资源运行模块迁到严格TS，内部类型和实际核心宿主接入fixture齐备。
+源码154项（52候选、102历史）、产物各52项、三格式浏览器各21共63项通过；
+严格分包及全仓398生产TS流程通过，最终宿主兼容修正另经分包fixture验证。
+仅当前实现内部契约；公开声明04、WebKit无帧回调的前两格像素与资源边界仍待完成。
+详见[检查点](changes/2026-09-13-PKG-AUTO-THUMB-03-internal-types.md)；不增加done数，
+不关闭像素风险。该检查点单独本地提交，Mask源码与状态不纳入同一提交。
+
 ## PKG-DANMUKU-07 弹幕稳定性阶段验收完成
 
 12后的源码在三引擎完成新旧插件两档负载对照，每例三轮42秒原生播放；候选