Validate package lifecycle in CI

The web player carried a Shaka Player integration plus the scaffolding
built up around it while debugging: an ActionQueue that serialized every
play/pause/seek/volume call behind a 2s timeout, a shallowEqual source
comparison, and a large amount of debug logging. All of it existed to
work around Shaka's async attach/load lifecycle.

Every source this fork's consumer plays is HLS, and the only thing Shaka
was providing is HLS playback in browsers without native support. hls.js
does that in a fraction of the code, so drive the video element directly:
set `src` when the browser plays HLS natively (Safari/WebKit) or the
source isn't HLS at all, and attach hls.js otherwise.

Dropping the queue restores the original direct play/pause/seek/volume
implementations. `resume()` now swallows play() rejections, which the
queue used to absorb -- these are routine when play() lands before the
manifest is parsed or when autoplay is denied.

The source effect keys on the URI string rather than the source object.
Consumers pass `source={{uri}}` as a fresh object literal every render,
which is what shallowEqual was defending against.

Carried forward from the Shaka implementation: the onSeekComplete event
and objectFit: 'fill'. Also resolves `poster` to a URL string instead of
suppressing the type error with @ts-ignore.

Dropped: web-side cropStart/cropEnd handling, which was implemented with
Shaka's playRangeStart/playRangeEnd. No consumer passes those props, and
neither upstream's web player nor this file before Shaka supported them.

.gitea/workflows/check-js.yaml

@@ -0,0 +1,38 @@
+name: Check JS
+
+on:
+  pull_request:
+  push:
+    branches:
+      - railbird-v6
+
+jobs:
+  typescript:
+    name: Check TS (tsc)
+    runs-on: nixos-x86_64-linux
+    defaults:
+      run:
+        shell: nix shell nixpkgs#nodejs_22 nixpkgs#yarn -c bash -e {0}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install node_modules and build package
+        run: yarn install --immutable
+      - name: Check TypeScript
+        run: yarn tsc
+      - name: Test web HLS
+        run: yarn test:web
+
+  lint:
+    name: Lint JS (eslint, prettier)
+    runs-on: nixos-x86_64-linux
+    defaults:
+      run:
+        shell: nix shell nixpkgs#nodejs_22 nixpkgs#yarn -c bash -e {0}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install node_modules and build package
+        run: yarn install --immutable
+      - name: Run ESLint
+        run: yarn lint
+      - name: Verify auto-fix produces no changes
+        run: yarn lint --fix && git diff --exit-code HEAD

package.json

@@ -31,11 +31,11 @@
         "react": "18.2.0",
         "react-native": "0.73.2",
         "react-native-windows": "^0.61.0-0",
-        "release-it": "^16.2.1",
+        "release-it": "^16.2.1"
-        "typescript": "5.1.6"
     },
     "dependencies": {
-        "hls.js": "^1.6.16"
+        "hls.js": "^1.6.16",
+        "typescript": "5.6.3"
     },
     "peerDependencies": {
         "react": "*",
@@ -50,6 +50,7 @@
         "docs": "yarn --cwd docs build",
         "release": "release-it",
         "test": "echo no test available",
+        "test:web": "yarn tsc -p test/tsconfig.json && node --test test/web-hls.test.js",
         "check-ios": "scripts/swift-format.sh && scripts/swift-lint.sh && scripts/clang-format.sh",
         "check-android": "scripts/kotlin-lint.sh",
         "check-all": "yarn check-android; yarn check-ios; yarn lint",

src/Video.tsx

@@ -475,7 +475,7 @@ const Video = forwardRef<VideoRef, ReactVideoProps>(
       (e: NativeSyntheticEvent<OnSeekCompleteData>) => {
         onSeekComplete?.(e.nativeEvent);
       },
-      [onSeekComplete]
+      [onSeekComplete],
     );
 
     const onVideoPlaybackStateChanged = useCallback(
@@ -733,10 +733,10 @@ const Video = forwardRef<VideoRef, ReactVideoProps>(
       }
 
       // poster style
-      const baseStyle: StyleProp<ImageStyle> = {
+      const baseStyle: StyleProp<ImageStyle> = [
-        ...StyleSheet.absoluteFill,
+        StyleSheet.absoluteFill,
-        resizeMode: _posterResizeMode,
+        {resizeMode: _posterResizeMode},
-      };
+      ];
 
       let posterStyle: StyleProp<ImageStyle> = baseStyle;
 
@@ -786,10 +786,10 @@ const Video = forwardRef<VideoRef, ReactVideoProps>(
     ]);
 
     const _style: StyleProp<ViewStyle> = useMemo(
-      () => ({
+      () => [
-        ...StyleSheet.absoluteFill,
+        StyleSheet.absoluteFill,
-        ...(showPoster ? {display: 'none'} : {}),
+        showPoster ? {display: 'none'} : undefined,
-      }),
+      ],
       [showPoster],
     );
 

src/Video.web.tsx

@@ -8,11 +8,17 @@ import React, {
 } from 'react';
 import Hls from 'hls.js';
 import type {VideoRef, ReactVideoProps, VideoMetadata} from './types';
+import {
+  createWebPlaybackErrorReporter,
+  describeHlsError,
+  describeMediaError,
+  isAppleWebKit,
+  selectWebHlsPlaybackMode,
+  type WebHlsPlaybackMode,
+} from './webHls';
 
 const HLS_MIME = 'application/vnd.apple.mpegurl';
 
-const isHlsSource = (uri: string) => /\.m3u8(\?|#|$)/i.test(uri);
-
 // `poster` is either a (deprecated) plain URI string or a poster object whose
 // `source` follows the RN image-source shape. The DOM only takes a URL string.
 const resolvePosterUri = (
@@ -127,21 +133,31 @@ const Video = forwardRef<VideoRef, ReactVideoProps>(
         autorotate ??= fsPrefs.current.fullscreenAutorotate;
 
         const run = async () => {
+          const browserOrientation = screen.orientation as
+            | {
+                lock?: (orientation: 'landscape' | 'portrait') => Promise<void>;
+                unlock?: () => void;
+              }
+            | undefined;
           try {
             if (newVal) {
               await nativeRef.current?.requestFullscreen({
                 navigationUI: 'hide',
               });
               if (orientation === 'all' || !orientation || autorotate) {
-                screen.orientation.unlock();
+                if (typeof browserOrientation?.unlock === 'function') {
-              } else {
+                  browserOrientation.unlock();
-                await screen.orientation.lock(orientation);
+                }
+              } else if (typeof browserOrientation?.lock === 'function') {
+                await browserOrientation.lock(orientation);
               }
             } else {
               if (document.fullscreenElement) {
                 await document.exitFullscreen();
               }
-              screen.orientation.unlock();
+              if (typeof browserOrientation?.unlock === 'function') {
+                browserOrientation.unlock();
+              }
             }
           } catch (e) {
             // Changing fullscreen status without a button click is not allowed so it throws.
@@ -252,8 +268,20 @@ const Video = forwardRef<VideoRef, ReactVideoProps>(
     // on anything object-shaped would tear down and reload the stream constantly.
     const onErrorRef = useRef(onError);
     onErrorRef.current = onError;
+    const playbackErrorReporterRef =
+      useRef<ReturnType<typeof createWebPlaybackErrorReporter>>();
+    if (!playbackErrorReporterRef.current) {
+      playbackErrorReporterRef.current = createWebPlaybackErrorReporter(
+        (error) => onErrorRef.current?.({error}),
+      );
+    }
+    const playbackDiagnosticsRef = useRef<{
+      mode: WebHlsPlaybackMode;
+      nativeHlsSupport: string;
+    }>();
 
     const uri = source?.uri as string | undefined;
+    const sourceType = source?.type;
 
     useEffect(() => {
       const video = nativeRef.current;
@@ -261,14 +289,19 @@ const Video = forwardRef<VideoRef, ReactVideoProps>(
         return;
       }
 
-      // Safari (and iOS WebKit) plays HLS natively; everywhere else the browser
+      playbackErrorReporterRef.current?.reset();
-      // has no HLS support at all, so an .m3u8 has to go through hls.js.
+      const nativeHlsSupport = video.canPlayType(HLS_MIME);
-      const needsMse =
+      const mode = selectWebHlsPlaybackMode(uri, sourceType, {
-        isHlsSource(uri) && !video.canPlayType(HLS_MIME) && Hls.isSupported();
+        hlsJsSupported: Hls.isSupported(),
+        nativeHlsSupport,
+        preferNativeHls: isAppleWebKit(navigator.userAgent, navigator.vendor),
+      });
+      playbackDiagnosticsRef.current = {mode, nativeHlsSupport};
 
-      if (!needsMse) {
+      if (mode === 'native') {
         video.src = uri;
         return () => {
+          playbackErrorReporterRef.current?.reset();
           video.removeAttribute('src');
           video.load();
         };
@@ -281,19 +314,22 @@ const Video = forwardRef<VideoRef, ReactVideoProps>(
         if (!data.fatal) {
           return;
         }
-        onErrorRef.current?.({
+        const errorString = `${describeHlsError(
-          error: {
+          data,
-            errorString: `${data.type}: ${data.details}`,
+        )}; mode=hls.js; nativeHlsSupport=${nativeHlsSupport || 'none'}`;
-          },
+        playbackErrorReporterRef.current?.addHls(
-        });
+          errorString,
+          `hls.js/${data.type}`,
+        );
       });
       hls.loadSource(uri);
       hls.attachMedia(video);
 
       return () => {
+        playbackErrorReporterRef.current?.reset();
         hls.destroy();
       };
-    }, [uri]);
+    }, [sourceType, uri]);
 
     useMediaSession(source?.metadata, nativeRef, showNotificationControls);
 
@@ -349,15 +385,23 @@ const Video = forwardRef<VideoRef, ReactVideoProps>(
         }}
         onLoadedData={() => onReadyForDisplay?.()}
         onError={() => {
-          if (!nativeRef.current?.error) {
+          const video = nativeRef.current;
+          if (!video?.error) {
             return;
           }
-          onError?.({
+          const diagnostics = playbackDiagnosticsRef.current;
-            error: {
+          const mediaError = describeMediaError({
-              errorString: nativeRef.current.error.message ?? 'Unknown error',
+            currentSrc: video.currentSrc,
-              code: nativeRef.current.error.code,
+            networkState: video.networkState,
-            },
+            readyState: video.readyState,
+            error: video.error,
+            playbackMode: diagnostics?.mode,
+            nativeHlsSupport: diagnostics?.nativeHlsSupport,
           });
+          playbackErrorReporterRef.current?.addMedia(
+            mediaError,
+            video.error.code,
+          );
         }}
         onLoadedMetadata={() => {
           if (source?.startPosition) {
@@ -414,7 +458,7 @@ const useMediaSession = (
   nativeRef: RefObject<HTMLVideoElement>,
   showNotification: boolean,
 ) => {
-  const isPlaying = !nativeRef.current?.paused ?? false;
+  const isPlaying = nativeRef.current ? !nativeRef.current.paused : false;
   const progress = nativeRef.current?.currentTime ?? 0;
   const duration = Number.isFinite(nativeRef.current?.duration)
     ? nativeRef.current?.duration

src/webHls.ts

@@ -0,0 +1,248 @@
+export type WebHlsPlaybackMode = 'hls.js' | 'native';
+
+export interface WebHlsPlaybackCapabilities {
+  hlsJsSupported: boolean;
+  nativeHlsSupport: string;
+  preferNativeHls: boolean;
+}
+
+export interface HlsErrorDetails {
+  type: string;
+  details: string;
+  reason?: string;
+  error?: {message?: string};
+  response?: {
+    code?: number;
+    text?: string;
+    url?: string;
+    data?: unknown;
+  };
+  url?: string;
+}
+
+export interface MediaElementDiagnostics {
+  currentSrc: string;
+  networkState: number;
+  readyState: number;
+  error: {code: number; message?: string} | null;
+  playbackMode?: WebHlsPlaybackMode;
+  nativeHlsSupport?: string;
+}
+
+export interface WebVideoError {
+  errorString: string;
+  code?: number;
+  domain: string;
+}
+
+const HLS_SOURCE_PATTERN = /\.m3u8(\?|#|$)/i;
+const HLS_SOURCE_TYPES = new Set([
+  'application/vnd.apple.mpegurl',
+  'application/x-mpegurl',
+  'hls',
+  'm3u8',
+]);
+
+const MEDIA_ERROR_NAMES: Record<number, string> = {
+  1: 'MEDIA_ERR_ABORTED',
+  2: 'MEDIA_ERR_NETWORK',
+  3: 'MEDIA_ERR_DECODE',
+  4: 'MEDIA_ERR_SRC_NOT_SUPPORTED',
+};
+
+export const isHlsSource = (uri: string, sourceType?: string): boolean => {
+  const normalizedType = sourceType?.split(';', 1)[0]?.trim().toLowerCase();
+  return (
+    HLS_SOURCE_PATTERN.test(uri) ||
+    (normalizedType !== undefined && HLS_SOURCE_TYPES.has(normalizedType))
+  );
+};
+
+export const isAppleWebKit = (userAgent: string, vendor: string): boolean =>
+  /AppleWebKit/i.test(userAgent) && /Apple/i.test(vendor);
+
+export const selectWebHlsPlaybackMode = (
+  uri: string,
+  sourceType: string | undefined,
+  {
+    hlsJsSupported,
+    nativeHlsSupport,
+    preferNativeHls,
+  }: WebHlsPlaybackCapabilities,
+): WebHlsPlaybackMode => {
+  if (!isHlsSource(uri, sourceType)) {
+    return 'native';
+  }
+
+  if (preferNativeHls && nativeHlsSupport) {
+    return 'native';
+  }
+
+  return hlsJsSupported ? 'hls.js' : 'native';
+};
+
+const compactText = (value: string): string =>
+  value.replace(/\s+/g, ' ').trim();
+
+const limitedText = (value: string, maxLength = 160): string => {
+  const compact = compactText(value);
+  return compact.length > maxLength
+    ? `${compact.slice(0, maxLength)}…`
+    : compact;
+};
+
+const SAFE_RESPONSE_MESSAGES = new Set([
+  'Playlist does not exist',
+  'Video stream not found',
+]);
+
+export const sanitizeDiagnosticUrl = (value: string): string => {
+  try {
+    const url = new URL(value);
+    url.username = '';
+    url.password = '';
+    url.search = url.search ? '?<redacted>' : '';
+    url.hash = url.hash ? '#<redacted>' : '';
+    return url.toString().replaceAll('%3Credacted%3E', '<redacted>');
+  } catch {
+    return value.replace(/[?#].*$/, '?<redacted>');
+  }
+};
+
+const sanitizeHlsText = (value: string, data: HlsErrorDetails): string => {
+  let sanitized = value;
+  for (const url of [data.response?.url, data.url]) {
+    if (url) {
+      sanitized = sanitized.replaceAll(url, sanitizeDiagnosticUrl(url));
+    }
+  }
+  return limitedText(sanitized);
+};
+
+export const describeHlsError = (data: HlsErrorDetails): string => {
+  const parts = [`hls.js fatal ${data.type}: ${data.details}`];
+
+  if (data.reason && data.reason !== data.details) {
+    parts.push(`reason=${sanitizeHlsText(data.reason, data)}`);
+  }
+
+  if (data.error?.message && data.error.message !== data.reason) {
+    parts.push(`message=${sanitizeHlsText(data.error.message, data)}`);
+  }
+
+  const response = data.response;
+  if (response) {
+    if (response.code !== undefined) {
+      const statusText = response.text ? ` ${limitedText(response.text)}` : '';
+      parts.push(`HTTP ${response.code}${statusText}`);
+    }
+    if (typeof response.data === 'string' && response.data.trim()) {
+      const responseBody = compactText(response.data);
+      if (SAFE_RESPONSE_MESSAGES.has(responseBody)) {
+        parts.push(`response=${responseBody}`);
+      } else {
+        parts.push(`responseBodyLength=${response.data.length}`);
+      }
+    }
+    if (response.url) {
+      parts.push(`url=${sanitizeDiagnosticUrl(response.url)}`);
+    }
+  } else if (data.url) {
+    parts.push(`url=${sanitizeDiagnosticUrl(data.url)}`);
+  }
+
+  return parts.join('; ');
+};
+
+export const createWebPlaybackErrorReporter = (
+  report: (error: WebVideoError) => void,
+  debounceMs = 50,
+) => {
+  let hlsError: string | undefined;
+  let hlsDomain: string | undefined;
+  let mediaError: string | undefined;
+  let mediaCode: number | undefined;
+  let timeout: ReturnType<typeof setTimeout> | undefined;
+  let reported = false;
+
+  const clearTimer = () => {
+    if (timeout !== undefined) {
+      clearTimeout(timeout);
+      timeout = undefined;
+    }
+  };
+
+  const schedule = () => {
+    if (reported) {
+      return;
+    }
+    clearTimer();
+    timeout = setTimeout(() => {
+      timeout = undefined;
+      reported = true;
+      const errorString = [hlsError, mediaError].filter(Boolean).join('; ');
+      report({
+        errorString,
+        code: mediaCode,
+        domain: hlsError
+          ? mediaError
+            ? 'hls.js/HTMLMediaElement'
+            : hlsDomain || 'hls.js'
+          : 'HTMLMediaElement',
+      });
+    }, debounceMs);
+  };
+
+  const reset = () => {
+    clearTimer();
+    hlsError = undefined;
+    hlsDomain = undefined;
+    mediaError = undefined;
+    mediaCode = undefined;
+    reported = false;
+  };
+
+  return {
+    addHls(errorString: string, domain: string) {
+      if (reported) {
+        return;
+      }
+      hlsError = errorString;
+      hlsDomain = domain;
+      schedule();
+    },
+    addMedia(errorString: string, code: number) {
+      if (reported) {
+        return;
+      }
+      mediaError = errorString;
+      mediaCode = code;
+      schedule();
+    },
+    reset,
+  };
+};
+
+export const describeMediaError = (media: MediaElementDiagnostics): string => {
+  const code = media.error?.code ?? 0;
+  const errorName = MEDIA_ERROR_NAMES[code] ?? 'MEDIA_ERR_UNKNOWN';
+  const parts = [`HTMLMediaElement ${errorName} (${code})`];
+  const message = media.error?.message?.trim();
+
+  if (message) {
+    parts.push(`message=${limitedText(message)}`);
+  }
+  if (media.playbackMode) {
+    parts.push(`mode=${media.playbackMode}`);
+  }
+  if (media.nativeHlsSupport !== undefined) {
+    parts.push(`nativeHlsSupport=${media.nativeHlsSupport || 'none'}`);
+  }
+  if (media.currentSrc) {
+    parts.push(`src=${sanitizeDiagnosticUrl(media.currentSrc)}`);
+  }
+  parts.push(`networkState=${media.networkState}`);
+  parts.push(`readyState=${media.readyState}`);
+
+  return parts.join('; ');
+};

test/.gitignore

@@ -0,0 +1 @@
+lib/

test/tsconfig.json

@@ -0,0 +1,9 @@
+{
+  "extends": "../tsconfig.json",
+  "compilerOptions": {
+    "composite": false,
+    "rootDir": "../src",
+    "outDir": "./lib"
+  },
+  "include": ["../src/webHls.ts"]
+}

test/web-hls.test.js

@@ -0,0 +1,228 @@
+/* eslint-disable @typescript-eslint/no-var-requires */
+const assert = require('node:assert/strict');
+const test = require('node:test');
+
+const {
+  createWebPlaybackErrorReporter,
+  describeHlsError,
+  describeMediaError,
+  isAppleWebKit,
+  isHlsSource,
+  sanitizeDiagnosticUrl,
+  selectWebHlsPlaybackMode,
+} = require('./lib/webHls');
+
+test('recognizes HLS playlist URLs with query strings', () => {
+  assert.equal(isHlsSource('https://api.example/playlist/42.m3u8?vod=1'), true);
+  assert.equal(isHlsSource('https://cdn.example/video.mp4'), false);
+  assert.equal(
+    isHlsSource('https://api.example/playlist/42', 'application/x-mpegURL'),
+    true,
+  );
+});
+
+test('uses hls.js in Chromium even when native HLS support reports maybe', () => {
+  const userAgent =
+    'Mozilla/5.0 Chrome/146.0.0.0 Safari/537.36 AppleWebKit/537.36';
+  assert.equal(isAppleWebKit(userAgent, 'Google Inc.'), false);
+  assert.equal(
+    selectWebHlsPlaybackMode(
+      'https://api.example/playlist/42.m3u8',
+      undefined,
+      {
+        hlsJsSupported: true,
+        nativeHlsSupport: 'maybe',
+        preferNativeHls: isAppleWebKit(userAgent, 'Google Inc.'),
+      },
+    ),
+    'hls.js',
+  );
+});
+
+test('uses hls.js for an extensionless HLS source with an explicit type', () => {
+  assert.equal(
+    selectWebHlsPlaybackMode(
+      'https://api.example/playlist/42',
+      'application/vnd.apple.mpegurl; charset=utf-8',
+      {
+        hlsJsSupported: true,
+        nativeHlsSupport: '',
+        preferNativeHls: false,
+      },
+    ),
+    'hls.js',
+  );
+});
+
+test('preserves native HLS in Apple WebKit browsers', () => {
+  const userAgent =
+    'Mozilla/5.0 Version/18.6 Safari/605.1.15 AppleWebKit/605.1.15';
+  assert.equal(isAppleWebKit(userAgent, 'Apple Computer, Inc.'), true);
+  assert.equal(
+    selectWebHlsPlaybackMode(
+      'https://api.example/playlist/42.m3u8',
+      undefined,
+      {
+        hlsJsSupported: true,
+        nativeHlsSupport: 'maybe',
+        preferNativeHls: isAppleWebKit(userAgent, 'Apple Computer, Inc.'),
+      },
+    ),
+    'native',
+  );
+});
+
+test('falls back to native playback when hls.js is unavailable', () => {
+  assert.equal(
+    selectWebHlsPlaybackMode(
+      'https://api.example/playlist/42.m3u8',
+      undefined,
+      {
+        hlsJsSupported: false,
+        nativeHlsSupport: 'probably',
+        preferNativeHls: false,
+      },
+    ),
+    'native',
+  );
+  assert.equal(
+    selectWebHlsPlaybackMode('https://cdn.example/video.mp4', undefined, {
+      hlsJsSupported: true,
+      nativeHlsSupport: '',
+      preferNativeHls: false,
+    }),
+    'native',
+  );
+});
+
+test('includes fatal HLS network and response details', () => {
+  assert.equal(
+    describeHlsError({
+      type: 'networkError',
+      details: 'manifestParsingError',
+      reason: 'no EXTM3U delimiter',
+      error: {message: 'manifest parsing failed'},
+      response: {
+        code: 200,
+        text: 'OK',
+        data: 'Playlist does not exist',
+        url: 'https://api.example/playlist/42.m3u8',
+      },
+    }),
+    'hls.js fatal networkError: manifestParsingError; ' +
+      'reason=no EXTM3U delimiter; message=manifest parsing failed; HTTP 200 OK; ' +
+      'response=Playlist does not exist; ' +
+      'url=https://api.example/playlist/42.m3u8',
+  );
+});
+
+test('redacts URL credentials, query values, and unknown response bodies', () => {
+  assert.equal(
+    sanitizeDiagnosticUrl(
+      'https://user:password@cdn.example/42.m3u8?token=secret#private',
+    ),
+    'https://cdn.example/42.m3u8?<redacted>#<redacted>',
+  );
+  assert.equal(
+    describeHlsError({
+      type: 'networkError',
+      details: 'manifestLoadError',
+      response: {
+        code: 403,
+        data: 'internal credential: secret',
+        url: 'https://cdn.example/42.m3u8?token=secret',
+      },
+    }),
+    'hls.js fatal networkError: manifestLoadError; HTTP 403; ' +
+      'responseBodyLength=27; url=https://cdn.example/42.m3u8?<redacted>',
+  );
+  assert.equal(
+    describeHlsError({
+      type: 'keySystemError',
+      details: 'licenseRequestFailed',
+      error: {
+        message:
+          'License request failed (https://license.example/key?token=secret)',
+      },
+      url: 'https://license.example/key?token=secret',
+    }),
+    'hls.js fatal keySystemError: licenseRequestFailed; ' +
+      'message=License request failed (https://license.example/key?<redacted>); ' +
+      'url=https://license.example/key?<redacted>',
+  );
+});
+
+const wait = (milliseconds) =>
+  new Promise((resolve) => setTimeout(resolve, milliseconds));
+
+for (const order of ['hls-first', 'media-first']) {
+  test(`combines HLS and media errors once when ${order}`, async () => {
+    const reports = [];
+    const reporter = createWebPlaybackErrorReporter(
+      (error) => reports.push(error),
+      5,
+    );
+    const addHls = () =>
+      reporter.addHls(
+        'hls.js fatal mediaError: bufferAppendError',
+        'hls.js/mediaError',
+      );
+    const addMedia = () =>
+      reporter.addMedia('HTMLMediaElement MEDIA_ERR_DECODE (3)', 3);
+
+    if (order === 'hls-first') {
+      addHls();
+      addMedia();
+    } else {
+      addMedia();
+      addHls();
+    }
+    await wait(15);
+
+    assert.deepEqual(reports, [
+      {
+        errorString:
+          'hls.js fatal mediaError: bufferAppendError; ' +
+          'HTMLMediaElement MEDIA_ERR_DECODE (3)',
+        code: 3,
+        domain: 'hls.js/HTMLMediaElement',
+      },
+    ]);
+  });
+}
+
+test('reset cancels a pending source error and permits the next source', async () => {
+  const reports = [];
+  const reporter = createWebPlaybackErrorReporter(
+    (error) => reports.push(error),
+    5,
+  );
+  reporter.addHls('stale source failure', 'hls.js/networkError');
+  reporter.reset();
+  reporter.addMedia('current source failure', 4);
+  await wait(15);
+
+  assert.deepEqual(reports, [
+    {
+      errorString: 'current source failure',
+      code: 4,
+      domain: 'HTMLMediaElement',
+    },
+  ]);
+});
+
+test('names media error code 4 and records the selected playback path', () => {
+  assert.equal(
+    describeMediaError({
+      currentSrc: 'https://api.example/playlist/42.m3u8',
+      networkState: 3,
+      readyState: 0,
+      error: {code: 4},
+      playbackMode: 'native',
+      nativeHlsSupport: 'maybe',
+    }),
+    'HTMLMediaElement MEDIA_ERR_SRC_NOT_SUPPORTED (4); mode=native; ' +
+      'nativeHlsSupport=maybe; src=https://api.example/playlist/42.m3u8; ' +
+      'networkState=3; readyState=0',
+  );
+});