diff --git a/docs/assets/ts/artplayer-plugin-dash-control.d.ts b/docs/assets/ts/artplayer-plugin-dash-control.d.ts
index 4aaa0fcf7..98bba5c2a 100644
--- a/docs/assets/ts/artplayer-plugin-dash-control.d.ts
+++ b/docs/assets/ts/artplayer-plugin-dash-control.d.ts
@@ -10,9 +10,9 @@ declare namespace artplayerPluginDashControlDefinitions {
     bitrateInKbit?: number
   }
   export interface AudioTrack {
-    id?: string | number
-    index?: number
-    lang?: string
+    id?: string | number | null
+    index?: number | null
+    lang?: string | null
   }
   export interface Config<Item extends object = object> {
     control?: boolean
diff --git a/packages/artplayer-plugin-dash-control/ARCHITECTURE.md b/packages/artplayer-plugin-dash-control/ARCHITECTURE.md
index d2a37291b..dda76932d 100644
--- a/packages/artplayer-plugin-dash-control/ARCHITECTURE.md
+++ b/packages/artplayer-plugin-dash-control/ARCHITECTURE.md
@@ -73,6 +73,9 @@ the controlled error/identity tests. Changes to SDK capability detection belong
 `sdk.ts`, not in a global `any` or ambient module escape.
 
 Public `Config`, `Option`, `QualityLevel`, `AudioTrack`, and `Result` are named types.
+AudioTrack id/index/lang include null as declared by both actual SDK generations;
+internal AudioFields aliases that public shape. Nullable default labels preserve
+runtime behavior, while caller formatters must still return strings.
 Default callbacks infer known SDK fields; explicit generic parameters or callback
 annotations accept a caller's more detailed SDK interfaces. Original object-based
 formatters remain valid. The optional overload supports omitted/undefined options;
@@ -126,5 +129,9 @@ It also includes a native SDK control without an ArtPlayer instance. Early SDK 4
 paused-seek stalls remain open; later passes do not resolve them. Unsupported MSE is
 recorded as a playback capability gap, not acceptance. This plugin currently refreshes
 on ready/restart/explicit update, not automatically on external SDK events.
+`refactor/scripts/dash-sdk-types.test.mjs` compares actual SDK-only and plugin
+consumers across ten compiler/module configurations, retaining upstream-only
+Node10/old DOM diagnostics. The exact peer dependency closure is hash-pinned in
+`refactor/baselines/dash-type-dependencies.json`; no type shim or paths mapping is used.
 See [refactor validation](../../refactor/dash-validation.md) for baseline failures
 and [task plan](../../refactor/plan.md) for remaining type and release work.
diff --git a/packages/artplayer-plugin-dash-control/README.md b/packages/artplayer-plugin-dash-control/README.md
index 48f8175cb..e90104cd2 100644
--- a/packages/artplayer-plugin-dash-control/README.md
+++ b/packages/artplayer-plugin-dash-control/README.md
@@ -6,6 +6,27 @@ Accepts a caller-owned dash.js instance at `art.dash`. Quality selection adapts
 dash.js 4.x quality methods or 5.x representation methods. Version 5 selection uses
 representation IDs so bitrate filtering does not change the selected quality.
 
+## TypeScript
+
+The formatter receives the original SDK object. For dash.js 5.2.1 types:
+
+```ts
+import type { MediaInfo, Representation } from 'dashjs'
+import dashControl from 'artplayer-plugin-dash-control'
+
+dashControl<Representation, MediaInfo>({
+  quality: { getName: level => `${level.height}p` },
+  audio: { getName: track => track.lang || String(track.id) },
+})
+```
+
+dash.js 4.5.2 uses `BitrateInfo` for quality instead of `Representation`. Audio
+metadata `id`, `index`, and `lang` may be null; custom formatters must return strings.
+The original object-based formatters and synchronous `update()` remain supported.
+Actual 5.2.1 SDK types resolve with TypeScript 5.9.3 NodeNext/Bundler in our matrix;
+Node10 resolution and TypeScript 4.3.5 have upstream SDK declaration limitations.
+See the [tested type matrix](../../refactor/changes/2026-09-12-PKG-DASH-05-sdk-types.md).
+
 ## Demo
 
 [https://artplayer.org](https://artplayer.org/?libs=https://cdnjs.cloudflare.com/ajax/libs/dashjs/5.2.1/modern/umd/dash.all.min.js%0A./uncompiled/artplayer-plugin-dash-control/index.js&example=dash.control)
diff --git a/packages/artplayer-plugin-dash-control/src/types.ts b/packages/artplayer-plugin-dash-control/src/types.ts
index 7e73ec882..76aef92a7 100644
--- a/packages/artplayer-plugin-dash-control/src/types.ts
+++ b/packages/artplayer-plugin-dash-control/src/types.ts
@@ -1,6 +1,6 @@
-import type { Config } from '../types/artplayer-plugin-dash-control'
+import type { AudioTrack, Config } from '../types/artplayer-plugin-dash-control'
 
-export type Label = string | number | undefined
+export type Label = string | number | null | undefined
 export type Identifier = string | number
 export type Valid = () => boolean
 export type Cleanup = () => void
@@ -12,11 +12,7 @@ export interface QualityFields {
   qualityIndex?: number
 }
 
-export interface AudioFields {
-  id?: Identifier
-  index?: number
-  lang?: string
-}
+export type AudioFields = AudioTrack
 
 export interface Dash<Level extends object = object, Track extends object = object> {
   getVideoElement: () => object | null
diff --git a/packages/artplayer-plugin-dash-control/types/artplayer-plugin-dash-control.d.ts b/packages/artplayer-plugin-dash-control/types/artplayer-plugin-dash-control.d.ts
index 832a1b35a..d17c250cf 100644
--- a/packages/artplayer-plugin-dash-control/types/artplayer-plugin-dash-control.d.ts
+++ b/packages/artplayer-plugin-dash-control/types/artplayer-plugin-dash-control.d.ts
@@ -10,9 +10,9 @@ export interface QualityLevel {
 }
 
 export interface AudioTrack {
-  id?: string | number
-  index?: number
-  lang?: string
+  id?: string | number | null
+  index?: number | null
+  lang?: string | null
 }
 
 export interface Config<Item extends object = object> {
diff --git a/refactor/baselines/dash-sdk-type-diagnostics.json b/refactor/baselines/dash-sdk-type-diagnostics.json
new file mode 100644
index 000000000..ed54b6b7c
--- /dev/null
+++ b/refactor/baselines/dash-sdk-type-diagnostics.json
@@ -0,0 +1,149 @@
+{
+  "schemaVersion": 1,
+  "task": "PKG-DASH-05",
+  "note": "Reviewed SDK-only baseline, not a waiver of declaration errors. Modern SDK 5 consumers require export-aware resolution; TS 4.3 also lacks FontFace. Plugin consumers must add no diagnostics; invalid usages must add the expected two.",
+  "matrix": [
+    {
+      "sdk": "4.5.2",
+      "compiler": "5.9.3",
+      "mode": "node10-commonjs",
+      "sdkOnly": {
+        "diagnostics": [],
+        "files": [
+          "node_modules/dashjs/index.d.ts"
+        ]
+      }
+    },
+    {
+      "sdk": "4.5.2",
+      "compiler": "5.9.3",
+      "mode": "nodenext-cjs",
+      "sdkOnly": {
+        "diagnostics": [],
+        "files": [
+          "node_modules/dashjs/index.d.ts"
+        ]
+      }
+    },
+    {
+      "sdk": "4.5.2",
+      "compiler": "5.9.3",
+      "mode": "nodenext-esm",
+      "sdkOnly": {
+        "diagnostics": [],
+        "files": [
+          "node_modules/dashjs/index.d.ts"
+        ]
+      }
+    },
+    {
+      "sdk": "4.5.2",
+      "compiler": "5.9.3",
+      "mode": "bundler-esm",
+      "sdkOnly": {
+        "diagnostics": [],
+        "files": [
+          "node_modules/dashjs/index.d.ts"
+        ]
+      }
+    },
+    {
+      "sdk": "4.5.2",
+      "compiler": "4.3.5",
+      "mode": "node10-commonjs",
+      "sdkOnly": {
+        "diagnostics": [],
+        "files": [
+          "node_modules/dashjs/index.d.ts"
+        ]
+      }
+    },
+    {
+      "sdk": "5.2.1",
+      "compiler": "5.9.3",
+      "mode": "node10-commonjs",
+      "sdkOnly": {
+        "diagnostics": [
+          {
+            "file": "node_modules/dashjs/index.d.ts",
+            "code": 2307,
+            "line": 6,
+            "message": "Cannot find module '@svta/cml-request' or its corresponding type declarations.\n  There are types at '<consumer>/node_modules/@svta/cml-request/dist/index.d.ts', but this result could not be resolved under your current 'moduleResolution' setting. Consider updating to 'node16', 'nodenext', or 'bundler'."
+          }
+        ],
+        "files": [
+          "node_modules/dashjs/index.d.ts"
+        ]
+      }
+    },
+    {
+      "sdk": "5.2.1",
+      "compiler": "5.9.3",
+      "mode": "nodenext-cjs",
+      "sdkOnly": {
+        "diagnostics": [],
+        "files": [
+          "node_modules/@svta/cml-utils/dist/index.d.ts",
+          "node_modules/@svta/cml-structured-field-values/dist/index.d.ts",
+          "node_modules/@svta/cml-cmcd/dist/index.d.ts",
+          "node_modules/@svta/cml-request/dist/index.d.ts",
+          "node_modules/dashjs/index.d.ts"
+        ]
+      }
+    },
+    {
+      "sdk": "5.2.1",
+      "compiler": "5.9.3",
+      "mode": "nodenext-esm",
+      "sdkOnly": {
+        "diagnostics": [],
+        "files": [
+          "node_modules/@svta/cml-utils/dist/index.d.ts",
+          "node_modules/@svta/cml-structured-field-values/dist/index.d.ts",
+          "node_modules/@svta/cml-cmcd/dist/index.d.ts",
+          "node_modules/@svta/cml-request/dist/index.d.ts",
+          "node_modules/dashjs/index.d.ts"
+        ]
+      }
+    },
+    {
+      "sdk": "5.2.1",
+      "compiler": "5.9.3",
+      "mode": "bundler-esm",
+      "sdkOnly": {
+        "diagnostics": [],
+        "files": [
+          "node_modules/@svta/cml-utils/dist/index.d.ts",
+          "node_modules/@svta/cml-structured-field-values/dist/index.d.ts",
+          "node_modules/@svta/cml-cmcd/dist/index.d.ts",
+          "node_modules/@svta/cml-request/dist/index.d.ts",
+          "node_modules/dashjs/index.d.ts"
+        ]
+      }
+    },
+    {
+      "sdk": "5.2.1",
+      "compiler": "4.3.5",
+      "mode": "node10-commonjs",
+      "sdkOnly": {
+        "diagnostics": [
+          {
+            "file": "node_modules/dashjs/index.d.ts",
+            "code": 2307,
+            "line": 6,
+            "message": "Cannot find module '@svta/cml-request' or its corresponding type declarations."
+          },
+          {
+            "file": "node_modules/dashjs/index.d.ts",
+            "code": 2304,
+            "line": 5067,
+            "message": "Cannot find name 'FontFace'."
+          }
+        ],
+        "files": [
+          "node_modules/dashjs/index.d.ts"
+        ]
+      }
+    }
+  ]
+}
diff --git a/refactor/baselines/dash-sdk-types-validation.json b/refactor/baselines/dash-sdk-types-validation.json
new file mode 100644
index 000000000..527393f13
--- /dev/null
+++ b/refactor/baselines/dash-sdk-types-validation.json
@@ -0,0 +1,685 @@
+{
+  "schemaVersion": 1,
+  "task": "PKG-DASH-05",
+  "sourceCommit": "c4b5f5f4",
+  "status": "doing",
+  "scope": "Actual SDK declaration projection, nullable metadata, source/artifact regression, generated Monaco types and isolated plugin tarball types. No new runtime media acceptance.",
+  "inputs": [
+    {
+      "file": "packages/artplayer-plugin-dash-control/src/types.ts",
+      "sha256LF": "4a2c6b17159a01b674fb9bd7b55f27695156918be7e19d6c71b30ea16232d2a4"
+    },
+    {
+      "file": "packages/artplayer-plugin-dash-control/types/artplayer-plugin-dash-control.d.ts",
+      "sha256LF": "ca279baa3c3020b570c76f3060fb591d3b7822c603ebb872ccd99a30af8a6a72"
+    },
+    {
+      "file": "docs/assets/ts/artplayer-plugin-dash-control.d.ts",
+      "sha256LF": "c7e3c83f3377b615e503a270af12915dcc82fe3f2cfabdae396632855a27f73f"
+    },
+    {
+      "file": "test/types/dash-control.ts",
+      "sha256LF": "4046e5b2b40d15c4a75c53730c38570e0f7dee08a932a22c60a0dc1aa1f603a7"
+    },
+    {
+      "file": "test/dash-lifecycle.test.js",
+      "sha256LF": "bc65b93b6a5a2f5e5ad9ffd7a467914bdc891af528dd135a96545b1cd6fc2bcb"
+    },
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+      "sha256LF": "6a71ce1c1d0569347b5ac212ccccf14ae7eabce64ec6de3e75dc4d30d8c151a0"
+    },
+    {
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+      "sha256LF": "85a500ba1cbba1ec8c12d83c1bed66f08a86f8e23f2a06faabe982f81323c8bb"
+    },
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+    },
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+    },
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+    },
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+    }
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+          "invalid": [
+            {
+              "code": 2322,
+              "message": "Type 'void' is not assignable to type 'Promise<void>'."
+            },
+            {
+              "code": 2554,
+              "message": "Expected 0 arguments, but got 1."
+            },
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+              "message": "Type '\"dash\"' is not assignable to type '\"artplayerPluginDashControl\"'."
+            },
+            {
+              "code": 2769,
+              "message": "No overload matches this call.\n  Overload 1 of 2, '(option?: Option<QualityLevel, AudioTrack> | undefined): (art: Artplayer) => Result', gave the following error.\n    Type '(value: QualityLevel, index: number) => string' is not assignable to type '(item: QualityLevel) => string'.\n      Target signature provides too few arguments. Expected 2 or more, but got 1.\n  Overload 2 of 2, '(option: Option<QualityLevel, AudioTrack>): (art: Artplayer) => Result', gave the following error.\n    Type '(value: QualityLevel, index: number) => string' is not assignable to type '(item: QualityLevel) => string'.\n      Target signature provides too few arguments. Expected 2 or more, but got 1."
+            },
+            {
+              "code": 2769,
+              "message": "No overload matches this call.\n  Overload 1 of 2, '(option?: Option<QualityLevel, AudioTrack> | undefined): (art: Artplayer) => Result', gave the following error.\n    Type '() => number' is not assignable to type '(item: AudioTrack) => string'.\n      Type 'number' is not assignable to type 'string'.\n  Overload 2 of 2, '(option: Option<QualityLevel, AudioTrack>): (art: Artplayer) => Result', gave the following error.\n    Type '() => number' is not assignable to type '(item: AudioTrack) => string'.\n      Type 'number' is not assignable to type 'string'."
+            },
+            {
+              "code": 2769,
+              "message": "No overload matches this call.\n  Overload 1 of 2, '(option?: Option<QualityLevel, AudioTrack> | undefined): (art: Artplayer) => Result', gave the following error.\n    Type 'string' is not assignable to type 'boolean | undefined'.\n  Overload 2 of 2, '(option: Option<QualityLevel, AudioTrack>): (art: Artplayer) => Result', gave the following error.\n    Type 'string' is not assignable to type 'boolean | undefined'."
+            },
+            {
+              "code": 2769,
+              "message": "No overload matches this call.\n  Overload 1 of 2, '(option?: Option<QualityLevel, AudioTrack> | undefined): (art: Artplayer) => Result', gave the following error.\n    Argument of type 'null' is not assignable to parameter of type 'Option<QualityLevel, AudioTrack> | undefined'.\n  Overload 2 of 2, '(option: Option<QualityLevel, AudioTrack>): (art: Artplayer) => Result', gave the following error.\n    Argument of type 'null' is not assignable to parameter of type 'Option<QualityLevel, AudioTrack>'."
+            },
+            {
+              "code": 2339,
+              "message": "Property 'unknownProperty' does not exist on type 'QualityLevel'."
+            }
+          ]
+        },
+        {
+          "compiler": "5.9.3",
+          "mode": "nodenext-cjs",
+          "diagnostics": [],
+          "invalid": [
+            {
+              "code": 2322,
+              "message": "Type 'void' is not assignable to type 'Promise<void>'."
+            },
+            {
+              "code": 2554,
+              "message": "Expected 0 arguments, but got 1."
+            },
+            {
+              "code": 2322,
+              "message": "Type '\"dash\"' is not assignable to type '\"artplayerPluginDashControl\"'."
+            },
+            {
+              "code": 2769,
+              "message": "No overload matches this call.\n  Overload 1 of 2, '(option?: Option<QualityLevel, AudioTrack> | undefined): (art: Artplayer) => Result', gave the following error.\n    Type '(value: QualityLevel, index: number) => string' is not assignable to type '(item: QualityLevel) => string'.\n      Target signature provides too few arguments. Expected 2 or more, but got 1.\n  Overload 2 of 2, '(option: Option<QualityLevel, AudioTrack>): (art: Artplayer) => Result', gave the following error.\n    Type '(value: QualityLevel, index: number) => string' is not assignable to type '(item: QualityLevel) => string'.\n      Target signature provides too few arguments. Expected 2 or more, but got 1."
+            },
+            {
+              "code": 2769,
+              "message": "No overload matches this call.\n  Overload 1 of 2, '(option?: Option<QualityLevel, AudioTrack> | undefined): (art: Artplayer) => Result', gave the following error.\n    Type '() => number' is not assignable to type '(item: AudioTrack) => string'.\n      Type 'number' is not assignable to type 'string'.\n  Overload 2 of 2, '(option: Option<QualityLevel, AudioTrack>): (art: Artplayer) => Result', gave the following error.\n    Type '() => number' is not assignable to type '(item: AudioTrack) => string'.\n      Type 'number' is not assignable to type 'string'."
+            },
+            {
+              "code": 2769,
+              "message": "No overload matches this call.\n  Overload 1 of 2, '(option?: Option<QualityLevel, AudioTrack> | undefined): (art: Artplayer) => Result', gave the following error.\n    Type 'string' is not assignable to type 'boolean | undefined'.\n  Overload 2 of 2, '(option: Option<QualityLevel, AudioTrack>): (art: Artplayer) => Result', gave the following error.\n    Type 'string' is not assignable to type 'boolean | undefined'."
+            },
+            {
+              "code": 2769,
+              "message": "No overload matches this call.\n  Overload 1 of 2, '(option?: Option<QualityLevel, AudioTrack> | undefined): (art: Artplayer) => Result', gave the following error.\n    Argument of type 'null' is not assignable to parameter of type 'Option<QualityLevel, AudioTrack> | undefined'.\n  Overload 2 of 2, '(option: Option<QualityLevel, AudioTrack>): (art: Artplayer) => Result', gave the following error.\n    Argument of type 'null' is not assignable to parameter of type 'Option<QualityLevel, AudioTrack>'."
+            },
+            {
+              "code": 2339,
+              "message": "Property 'unknownProperty' does not exist on type 'QualityLevel'."
+            }
+          ]
+        },
+        {
+          "compiler": "5.9.3",
+          "mode": "nodenext-esm",
+          "diagnostics": [],
+          "invalid": [
+            {
+              "code": 2322,
+              "message": "Type 'void' is not assignable to type 'Promise<void>'."
+            },
+            {
+              "code": 2554,
+              "message": "Expected 0 arguments, but got 1."
+            },
+            {
+              "code": 2322,
+              "message": "Type '\"dash\"' is not assignable to type '\"artplayerPluginDashControl\"'."
+            },
+            {
+              "code": 2769,
+              "message": "No overload matches this call.\n  Overload 1 of 2, '(option?: Option<QualityLevel, AudioTrack> | undefined): (art: Artplayer) => Result', gave the following error.\n    Type '(value: QualityLevel, index: number) => string' is not assignable to type '(item: QualityLevel) => string'.\n      Target signature provides too few arguments. Expected 2 or more, but got 1.\n  Overload 2 of 2, '(option: Option<QualityLevel, AudioTrack>): (art: Artplayer) => Result', gave the following error.\n    Type '(value: QualityLevel, index: number) => string' is not assignable to type '(item: QualityLevel) => string'.\n      Target signature provides too few arguments. Expected 2 or more, but got 1."
+            },
+            {
+              "code": 2769,
+              "message": "No overload matches this call.\n  Overload 1 of 2, '(option?: Option<QualityLevel, AudioTrack> | undefined): (art: Artplayer) => Result', gave the following error.\n    Type '() => number' is not assignable to type '(item: AudioTrack) => string'.\n      Type 'number' is not assignable to type 'string'.\n  Overload 2 of 2, '(option: Option<QualityLevel, AudioTrack>): (art: Artplayer) => Result', gave the following error.\n    Type '() => number' is not assignable to type '(item: AudioTrack) => string'.\n      Type 'number' is not assignable to type 'string'."
+            },
+            {
+              "code": 2769,
+              "message": "No overload matches this call.\n  Overload 1 of 2, '(option?: Option<QualityLevel, AudioTrack> | undefined): (art: Artplayer) => Result', gave the following error.\n    Type 'string' is not assignable to type 'boolean | undefined'.\n  Overload 2 of 2, '(option: Option<QualityLevel, AudioTrack>): (art: Artplayer) => Result', gave the following error.\n    Type 'string' is not assignable to type 'boolean | undefined'."
+            },
+            {
+              "code": 2769,
+              "message": "No overload matches this call.\n  Overload 1 of 2, '(option?: Option<QualityLevel, AudioTrack> | undefined): (art: Artplayer) => Result', gave the following error.\n    Argument of type 'null' is not assignable to parameter of type 'Option<QualityLevel, AudioTrack> | undefined'.\n  Overload 2 of 2, '(option: Option<QualityLevel, AudioTrack>): (art: Artplayer) => Result', gave the following error.\n    Argument of type 'null' is not assignable to parameter of type 'Option<QualityLevel, AudioTrack>'."
+            },
+            {
+              "code": 2339,
+              "message": "Property 'unknownProperty' does not exist on type 'QualityLevel'."
+            }
+          ]
+        },
+        {
+          "compiler": "5.9.3",
+          "mode": "bundler-esm",
+          "diagnostics": [],
+          "invalid": [
+            {
+              "code": 2322,
+              "message": "Type 'void' is not assignable to type 'Promise<void>'."
+            },
+            {
+              "code": 2554,
+              "message": "Expected 0 arguments, but got 1."
+            },
+            {
+              "code": 2322,
+              "message": "Type '\"dash\"' is not assignable to type '\"artplayerPluginDashControl\"'."
+            },
+            {
+              "code": 2769,
+              "message": "No overload matches this call.\n  Overload 1 of 2, '(option?: Option<QualityLevel, AudioTrack> | undefined): (art: Artplayer) => Result', gave the following error.\n    Type '(value: QualityLevel, index: number) => string' is not assignable to type '(item: QualityLevel) => string'.\n      Target signature provides too few arguments. Expected 2 or more, but got 1.\n  Overload 2 of 2, '(option: Option<QualityLevel, AudioTrack>): (art: Artplayer) => Result', gave the following error.\n    Type '(value: QualityLevel, index: number) => string' is not assignable to type '(item: QualityLevel) => string'.\n      Target signature provides too few arguments. Expected 2 or more, but got 1."
+            },
+            {
+              "code": 2769,
+              "message": "No overload matches this call.\n  Overload 1 of 2, '(option?: Option<QualityLevel, AudioTrack> | undefined): (art: Artplayer) => Result', gave the following error.\n    Type '() => number' is not assignable to type '(item: AudioTrack) => string'.\n      Type 'number' is not assignable to type 'string'.\n  Overload 2 of 2, '(option: Option<QualityLevel, AudioTrack>): (art: Artplayer) => Result', gave the following error.\n    Type '() => number' is not assignable to type '(item: AudioTrack) => string'.\n      Type 'number' is not assignable to type 'string'."
+            },
+            {
+              "code": 2769,
+              "message": "No overload matches this call.\n  Overload 1 of 2, '(option?: Option<QualityLevel, AudioTrack> | undefined): (art: Artplayer) => Result', gave the following error.\n    Type 'string' is not assignable to type 'boolean | undefined'.\n  Overload 2 of 2, '(option: Option<QualityLevel, AudioTrack>): (art: Artplayer) => Result', gave the following error.\n    Type 'string' is not assignable to type 'boolean | undefined'."
+            },
+            {
+              "code": 2769,
+              "message": "No overload matches this call.\n  Overload 1 of 2, '(option?: Option<QualityLevel, AudioTrack> | undefined): (art: Artplayer) => Result', gave the following error.\n    Argument of type 'null' is not assignable to parameter of type 'Option<QualityLevel, AudioTrack> | undefined'.\n  Overload 2 of 2, '(option: Option<QualityLevel, AudioTrack>): (art: Artplayer) => Result', gave the following error.\n    Argument of type 'null' is not assignable to parameter of type 'Option<QualityLevel, AudioTrack>'."
+            },
+            {
+              "code": 2339,
+              "message": "Property 'unknownProperty' does not exist on type 'QualityLevel'."
+            }
+          ]
+        },
+        {
+          "compiler": "4.3.5",
+          "mode": "node10-commonjs",
+          "diagnostics": [],
+          "invalid": [
+            {
+              "code": 2322,
+              "message": "Type 'void' is not assignable to type 'Promise<void>'."
+            },
+            {
+              "code": 2554,
+              "message": "Expected 0 arguments, but got 1."
+            },
+            {
+              "code": 2322,
+              "message": "Type '\"dash\"' is not assignable to type '\"artplayerPluginDashControl\"'."
+            },
+            {
+              "code": 2769,
+              "message": "No overload matches this call.\n  Overload 1 of 2, '(option?: Option<QualityLevel, AudioTrack> | undefined): (art: Artplayer) => Result', gave the following error.\n    Type '(value: QualityLevel, index: number) => string' is not assignable to type '(item: QualityLevel) => string'.\n  Overload 2 of 2, '(option: Option<QualityLevel, AudioTrack>): (art: Artplayer) => Result', gave the following error.\n    Type '(value: QualityLevel, index: number) => string' is not assignable to type '(item: QualityLevel) => string'."
+            },
+            {
+              "code": 2769,
+              "message": "No overload matches this call.\n  Overload 1 of 2, '(option?: Option<QualityLevel, AudioTrack> | undefined): (art: Artplayer) => Result', gave the following error.\n    Type '() => number' is not assignable to type '(item: AudioTrack) => string'.\n      Type 'number' is not assignable to type 'string'.\n  Overload 2 of 2, '(option: Option<QualityLevel, AudioTrack>): (art: Artplayer) => Result', gave the following error.\n    Type '() => number' is not assignable to type '(item: AudioTrack) => string'."
+            },
+            {
+              "code": 2769,
+              "message": "No overload matches this call.\n  Overload 1 of 2, '(option?: Option<QualityLevel, AudioTrack> | undefined): (art: Artplayer) => Result', gave the following error.\n    Type 'string' is not assignable to type 'boolean | undefined'.\n  Overload 2 of 2, '(option: Option<QualityLevel, AudioTrack>): (art: Artplayer) => Result', gave the following error.\n    Type 'string' is not assignable to type 'boolean | undefined'."
+            },
+            {
+              "code": 2769,
+              "message": "No overload matches this call.\n  Overload 1 of 2, '(option?: Option<QualityLevel, AudioTrack> | undefined): (art: Artplayer) => Result', gave the following error.\n    Argument of type 'null' is not assignable to parameter of type 'Option<QualityLevel, AudioTrack> | undefined'.\n  Overload 2 of 2, '(option: Option<QualityLevel, AudioTrack>): (art: Artplayer) => Result', gave the following error.\n    Argument of type 'null' is not assignable to parameter of type 'Option<QualityLevel, AudioTrack>'."
+            },
+            {
+              "code": 2339,
+              "message": "Property 'unknownProperty' does not exist on type 'QualityLevel'."
+            }
+          ]
+        }
+      ]
+    },
+    "files": [
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+        "file": "D:/github/ArtPlayer/refactor/.cache/dash-package-types-3hk1W5/artplayer-pack.log",
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+        "bytes": 1173
+      }
+    ]
+  },
+  "ci": {
+    "command": "yarn ci:check",
+    "exitCode": 0,
+    "tests": 720,
+    "unit": 663,
+    "engineering": 14,
+    "baseline": 43,
+    "strictProductionTS": 261,
+    "evidence": {
+      "file": "refactor/.cache/dash05-nullable-ci.log",
+      "sha256": "e0ba98c0d7813b05ed84962826f958dc13bc7ffca41626a048c54213f97d7fca",
+      "bytes": 75456
+    },
+    "scope": "Node/engineering/type gates, not the open real-media browser matrix",
+    "followUp": "Only fixture import order and SDK-only projection/identity guard changed after the full CI; scoped lint and all ten SDK type combinations passed again in dash05-sdk-types-test-final.log."
+  }
+}
diff --git a/refactor/baselines/dash-type-dependencies.json b/refactor/baselines/dash-type-dependencies.json
new file mode 100644
index 000000000..c0e7d8643
--- /dev/null
+++ b/refactor/baselines/dash-type-dependencies.json
@@ -0,0 +1,93 @@
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+  "task": "PKG-DASH-05",
+  "sdk": "dashjs@5.2.1",
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+  "releases": [
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+    },
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+      "name": "@svta/cml-cmcd",
+      "version": "2.3.2",
+      "tarball": "https://registry.npmjs.org/@svta/cml-cmcd/-/cml-cmcd-2.3.2.tgz",
+      "integrity": "sha512-SKBBjLmci0WK8HMjuv+36tVIMktonoOoxsXblOFZmB+ePPV2zjRMTD+2ZmE/1VEPJkKHENyhSjSHgJyeOlvZ1A==",
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+      }
+    },
+    {
+      "name": "@svta/cml-xml",
+      "version": "1.1.4",
+      "tarball": "https://registry.npmjs.org/@svta/cml-xml/-/cml-xml-1.1.4.tgz",
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+      }
+    },
+    {
+      "name": "@svta/cml-structured-field-values",
+      "version": "1.1.3",
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+        "package/dist/index.js.map": "d362481ef0cd65f8f8baaea1f1fe4f035475daf62b4d305aced026f44126c34d",
+        "package/dist/tsdoc-metadata.json": "12c1f31364a22600ae0cb9acb5e3a91ca3e3959e8f1d572dc772764f0b10e53d",
+        "package/package.json": "cf83f2aedb4e7a3cef6e8eeb31974cd6dc96197f964b39f8ff1e3716f3a8d367"
+      }
+    }
+  ],
+  "note": "Test-only actual SDK declaration dependency. Preserve the actual package manifest and exports when resolving; no production dependency or declaration shim."
+}
diff --git a/refactor/changes/2026-09-12-PKG-DASH-05-sdk-types.md b/refactor/changes/2026-09-12-PKG-DASH-05-sdk-types.md
new file mode 100644
index 000000000..7143bfce1
--- /dev/null
+++ b/refactor/changes/2026-09-12-PKG-DASH-05-sdk-types.md
@@ -0,0 +1,65 @@
+# PKG-DASH-05：真实 SDK 声明与 nullable 音轨修正
+
+起点 `c4b5f5f4`。本步推进实际 dash.js 类型消费者；媒体 seek 风险、SDK 自动刷新与设备
+验收保持独立，DASH-05 仍 doing。没有修改运行行为、增加生产依赖或改变版本。
+
+## 发现与修正
+
+真实 npm dash.js 4.5.2/5.2.1 的 MediaInfo 均声明 id、index、lang 可为 null。04 新增的
+AudioTrack 只表达 undefined，实际 SDK 的轨道无法赋给该类型。已先保存十组消费者的
+TS2322 失败，再补齐公开字段的 null。内部 AudioFields 直接复用 AudioTrack，Label
+表达现有默认格式化器可能返回 null 的行为，避免公开与内部类型再次漂移。
+
+新增 nullable 轨道运行回归：保留 null label、原轨道对象身份与同步选择，不把缺失标签
+改成新显示策略。既有 npm 发布类型使用 object 回调，没有这些新字段；旧 object 用法、
+Parameters 配置提取、同步 update、模块入口仍通过原有兼容测试。新自定义 formatter
+依然必须返回 string，实际 SDK 的 nullable lang 应通过 fallback 转为字符串。
+
+首次集成夹具直接返回 track.lang，正确触发了 string|null 到 string 的错误；先修正这条
+消费者写法，再单独加入 MediaInfo 到默认 AudioTrack 的赋值复现真正类型缺陷。
+两批失败诊断分别保留，未把消费者错误当成生产缺陷或放宽 formatter 返回类型。
+
+## 实际类型依赖与解析
+
+dash.js 5.2.1 声明引用 @svta/cml-request 1.0.12。按实际 manifest 中固定的 peer 版本，
+补齐 cml-utils 1.5.0、cml-cmcd 2.3.2、cml-xml 1.1.4、cml-structured-field-values 1.1.3。
+五个归档全部校验 npm SHA512 integrity/SHA256、完整文件成员与许可证来源；保留原始
+package.json/exports，没有添加类型 shim、paths 映射、环境类型或 skipLibCheck。
+
+归档工具现在支持合法 scoped npm 包，缓存文件名将 scope 分隔符转换为加号，仍限制
+名称/版本，保持原无 scope 缓存路径。补充路径穿越、反斜杠、伪 scope 与缓存别名负例。
+
+`dash-sdk-types.mjs` 将实际 SDK 声明与 manifest、上述完整小型依赖包放进临时 node_modules，
+用工作区候选公开声明编译 SDK-only、正例、非法用法三种消费者。它是声明投影测试，
+不是完整安装 SDK 的运行时验收；独立 Yarn tarball 类型测试仍负责插件的隔离分发。
+
+| SDK / 编译器与模式 | SDK-only | 加入候选插件 |
+| --- | --- | --- |
+| 4.5.2 / TS 5.9.3 四种模式、TS 4.3.5 Node10 | 0 诊断 | 0 诊断 |
+| 5.2.1 / TS 5.9.3 NodeNext CJS、NodeNext ESM、Bundler | 0 诊断 | 0 诊断 |
+| 5.2.1 / TS 5.9.3 Node10 | 1：无法解析仅通过 exports 暴露的 cml-request 类型 | 完全相同 |
+| 5.2.1 / TS 4.3.5 Node10 | 2：上述模块解析问题、旧 DOM 库无 FontFace | 完全相同 |
+
+每组移除 expect-error 后恰好新增错误返回类型和不存在的 SDK 属性两个诊断。预期值
+冻结的是经审查的 SDK-only 诊断和实际加载文件；插件必须增加零诊断。不能把两组上游
+不兼容配置表述为零错误编译，也不以冻结上游诊断免除后续 SDK 升级复核。
+
+## 验证和后续
+
+来源见 [类型依赖](../baselines/dash-type-dependencies.json)，上游边界见
+[诊断矩阵](../baselines/dash-sdk-type-diagnostics.json)，执行与产物证据见
+[本步记录](../baselines/dash-sdk-types-validation.json)。
+
+标准 build:ts 生成编辑器声明，标准 package build 运行后 JS 三格式字节保持原样。
+源码 Node 118 项、三格式 Node 274 项通过；真实 Monaco 三引擎 3 项通过，无重试/跳过。
+工作区外 Yarn tarball 安装/冻结重装后的五种类型模式通过，每种八条非法用法仍拒绝。
+隔离类型脚本的报告改为标识可复用 suite 和 introducedBy，避免后续执行被误读成 04 当时的
+结果。初次证据整理误把 docs/compiled 的平铺结构写成子目录，导致证据未生成并触发计划
+链接检查失败；已按实际构建器 cpy(flat:true) 修正记录脚本，保留失败日志。
+完整工程检查 720 项通过（663 单元、14 工程、43 基线），261 个生产 TS 文件严格检查通过。
+随后仅整理夹具 import 顺序、SDK-only 抽取与身份校验，局部 lint 和全部十组类型矩阵再次
+通过；详见机器证据。不将类型测试替代仍有开放失败的真实 DASH 播放验收。
+
+当前仍为 217 项：74 done、4 doing、139 todo。接续 DASH-SEEK-01、SDK 驱动刷新/错误、
+legacy 实际 SDK 媒体、有效设备和 06 的示例/完整分发。此次为独立本地检查点，不推送发布。
+回退本步应一起恢复公开/内部/生成声明及消费者测试，但保留前一检查点媒体失败证据。
diff --git a/refactor/dash-validation.md b/refactor/dash-validation.md
index d47c9af39..7b267d5a6 100644
--- a/refactor/dash-validation.md
+++ b/refactor/dash-validation.md
@@ -7,7 +7,7 @@
 
 ## 可重跑的测试
 
-- `yarn test:dash-control`：原有 5 项过滤/稳定 ID 回归、80 项行为/历史观察、31 项候选生命周期，共 116 项。
+- `yarn test:dash-control`：原有 5 项过滤/稳定 ID 回归、80 项行为/历史观察、33 项候选生命周期，共 118 项。
   该脚本和 `test:unit` 都保留旧测试，完整 CI 自动执行。
 - `yarn test:browser test/browser/dash-control.spec.js --trace on`：84 项，两个核心、发布插件 SDK 4/
   候选插件 SDK 4/5、两类菜单、两种选择及候选清理、Chromium/Firefox/WebKit。
@@ -26,10 +26,14 @@
 - `node --test refactor/scripts/dash-sdk.test.mjs`：SDK 归档/成员/许可证来源、媒体指纹与拓扑。
   如需重新合成诊断媒体，用 `node scripts/generate-dash-fixture.mjs refactor/.cache/new-dash-media`，
   输出目录必须不存在；可通过 `ARTPLAYER_FFMPEG` 指定 FFmpeg，不覆盖已冻结输入。
+- `node --test refactor/scripts/dash-sdk-types.test.mjs`：实际 SDK 和固定类型依赖，十组编译器/
+  模块配置；插件正例不得增加 SDK-only 诊断，两条非法用法均拒绝。旧解析/DOM 库的上游
+  边界详见 [类型矩阵](changes/2026-09-12-PKG-DASH-05-sdk-types.md)。CLI
+  `node refactor/scripts/dash-sdk-types.mjs` 只生成诊断报告，验收应运行上述 test 命令。
 
 Node helper 分别加载当前源码、固定 Git 提交的旧工作区 UMD、实际 npm main/legacy/module。
 Git 内容以 LF 指纹核对，发布归档与成员以原始字节指纹核对。`ARTPLAYER_TEST_DASH` 可指定
-待测产物，以系统路径分隔符连接；同时指定 main/legacy/module 时共 266 项，包含两代 SDK 的
+待测产物，以系统路径分隔符连接；同时指定 main/legacy/module 时共 274 项，包含两代 SDK 的
 行为与生命周期。未设置时不会把源码测试冒充三种候选产物验证。
 
 `test/helpers/dash-control.js` 只提供可控 SDK 方法和组件注册表，检查 this、类型参数、
diff --git a/refactor/fixtures/consumers/dash-sdk-v4.ts b/refactor/fixtures/consumers/dash-sdk-v4.ts
new file mode 100644
index 000000000..d0fd36150
--- /dev/null
+++ b/refactor/fixtures/consumers/dash-sdk-v4.ts
@@ -0,0 +1,27 @@
+import type Artplayer from 'artplayer'
+import type { AudioTrack, Option, QualityLevel, Result } from 'artplayer-plugin-dash-control'
+import type { BitrateInfo, MediaInfo, MediaPlayerClass } from 'dashjs'
+import dash from 'artplayer-plugin-dash-control'
+
+export type SDKInputs = [BitrateInfo, MediaInfo, MediaPlayerClass]
+declare const sdk: MediaPlayerClass
+export const levels = sdk.getBitrateInfoListFor('video')
+export const tracks = sdk.getTracksFor('audio')
+
+// Candidate plugin consumer.
+declare const art: Artplayer
+const option: Option<BitrateInfo, MediaInfo> = {
+  quality: { getName: level => `${level.qualityIndex}:${level.height}` },
+  audio: { getName: track => `${track.lang}:${track.index}` },
+}
+const result: Result = dash(option)(art)
+const synchronous: void = result.update()
+dash({ quality: { getName: (level: BitrateInfo) => String(level.bitrate) }, audio: { getName: (track: MediaInfo) => track.lang || String(track.id) } })
+const defaultTrack: AudioTrack = tracks[0]!
+const defaultLevel: QualityLevel = levels[0]!
+const legacy: Parameters<typeof dash>[0]['quality'] = { getName: (level: object) => String(level) }
+// @ts-expect-error SDK quality formatters must return strings.
+dash<BitrateInfo, MediaInfo>({ quality: { getName: level => level.height } })
+// @ts-expect-error Actual SDK fields must not become any.
+dash<BitrateInfo, MediaInfo>({ audio: { getName: track => track.nonexistentArtplayerField } })
+void [synchronous, legacy, defaultTrack, defaultLevel]
diff --git a/refactor/fixtures/consumers/dash-sdk-v5.ts b/refactor/fixtures/consumers/dash-sdk-v5.ts
new file mode 100644
index 000000000..357898a97
--- /dev/null
+++ b/refactor/fixtures/consumers/dash-sdk-v5.ts
@@ -0,0 +1,27 @@
+import type Artplayer from 'artplayer'
+import type { AudioTrack, Option, QualityLevel, Result } from 'artplayer-plugin-dash-control'
+import type { MediaInfo, MediaPlayerClass, Representation } from 'dashjs'
+import dash from 'artplayer-plugin-dash-control'
+
+export type SDKInputs = [Representation, MediaInfo, MediaPlayerClass]
+declare const sdk: MediaPlayerClass
+export const levels = sdk.getRepresentationsByType('video')
+export const tracks = sdk.getTracksFor('audio')
+
+// Candidate plugin consumer.
+declare const art: Artplayer
+const option: Option<Representation, MediaInfo> = {
+  quality: { getName: level => `${level.id}:${level.height}` },
+  audio: { getName: track => `${track.lang}:${track.index}` },
+}
+const result: Result = dash(option)(art)
+const synchronous: void = result.update()
+dash({ quality: { getName: (level: Representation) => String(level.bandwidth) }, audio: { getName: (track: MediaInfo) => track.lang || String(track.id) } })
+const defaultTrack: AudioTrack = tracks[0]!
+const defaultLevel: QualityLevel = levels[0]!
+const legacy: Parameters<typeof dash>[0]['quality'] = { getName: (level: object) => String(level) }
+// @ts-expect-error SDK quality formatters must return strings.
+dash<Representation, MediaInfo>({ quality: { getName: level => level.height } })
+// @ts-expect-error Actual SDK fields must not become any.
+dash<Representation, MediaInfo>({ audio: { getName: track => track.nonexistentArtplayerField } })
+void [synchronous, legacy, defaultTrack, defaultLevel]
diff --git a/refactor/plan.md b/refactor/plan.md
index 9d9592e08..ad97accb9 100644
--- a/refactor/plan.md
+++ b/refactor/plan.md
@@ -483,4 +483,4 @@
 - PKG-DASH-02: [记录](changes/2026-09-12-PKG-DASH-02-tests.md) [记录](dash-validation.md) [记录](baselines/dash-validation.json)
 - PKG-DASH-03: [记录](changes/2026-09-12-PKG-DASH-03-runtime.md) [记录](baselines/dash-runtime.json) [记录](dash-validation.md)
 - PKG-DASH-04: [记录](changes/2026-09-12-PKG-DASH-04-types.md) [记录](baselines/dash-types-validation.json) [记录](dash-validation.md)
-- PKG-DASH-05: [记录](changes/2026-09-12-PKG-DASH-05-sdk-checkpoint.md) [记录](baselines/dash-sdk.json) [记录](baselines/dash-sdk-checkpoint.json) [记录](dash-validation.md)
+- PKG-DASH-05: [记录](changes/2026-09-12-PKG-DASH-05-sdk-checkpoint.md) [记录](baselines/dash-sdk.json) [记录](baselines/dash-sdk-checkpoint.json) [记录](dash-validation.md) [记录](changes/2026-09-12-PKG-DASH-05-sdk-types.md) [记录](baselines/dash-sdk-types-validation.json)
diff --git a/refactor/progress.md b/refactor/progress.md
index 73445b85a..69e66faaf 100644
--- a/refactor/progress.md
+++ b/refactor/progress.md
@@ -1,5 +1,20 @@
 # 进度与证据
 
+## 当前实施：DASH-05 实际 SDK 类型与 nullable 元数据
+
+实际 dash.js 4.5.2/5.2.1 类型消费者已接入，固定五个 @svta 类型依赖及原始 exports。
+发现并修正两代 SDK 的 nullable id/index/lang 无法赋给新 AudioTrack 的问题；内部类型
+直接复用公开形状，运行逻辑不变，重新构建的三份 JS 与 04 指纹逐字节一致。
+
+十组 SDK/编译器/模块配置中八组零诊断，两组 SDK 5/旧解析方式保留 SDK 自身诊断；
+候选插件均增加零诊断，两条非法用法均拒绝。源码 Node 118、三格式 274、Monaco 三引擎
+3 项通过；隔离 Yarn tarball 的五种类型模式和每组八条非法用法通过。
+完整工程 CI 720 项通过、261 个生产 TS 文件严格检查通过；最后的夹具整理已单独重跑十组类型矩阵。
+
+任务仍为 74 done、4 doing、139 todo。DASH-SEEK-01、SDK 自动状态刷新、legacy 真实媒体、
+有效设备和完整分发仍未完成。详见 [本步说明](changes/2026-09-12-PKG-DASH-05-sdk-types.md)
+与 [执行记录](baselines/dash-sdk-types-validation.json)。以下为各检查点当时的状态。
+
 ## 当前实施：DASH-05 真实 SDK 与 MPD 检查点
 
 已固定 npm dash.js 4.5.2/5.2.1 归档/成员/许可证指纹，新增本地双画质双音轨 DASH、
diff --git a/refactor/risks.json b/refactor/risks.json
index 72c39d78d..5ae785051 100644
--- a/refactor/risks.json
+++ b/refactor/risks.json
@@ -2931,7 +2931,9 @@
         "refactor/baselines/dash-types-validation.json",
         "refactor/changes/2026-09-12-PKG-DASH-04-types.md",
         "test/types/dash-control.ts",
-        "refactor/scripts/dash-package-types.mjs"
+        "refactor/scripts/dash-package-types.mjs",
+        "refactor/changes/2026-09-12-PKG-DASH-05-sdk-types.md",
+        "refactor/baselines/dash-sdk-types-validation.json"
       ],
       "resolutionRationale": "五个自有 TS 模块严格检查通过，真实旧 npm 声明/候选消费者在 TS 4.3/5.9 兼容，五种模块模式及非法用法验证、真实 Monaco、工作区外 Yarn tarball 安装与类型检查通过。只关闭插件自身声明和格式解析问题，实际 SDK 类型/媒体矩阵仍由 05 接续。"
     },
diff --git a/refactor/scripts/dash-package-types.mjs b/refactor/scripts/dash-package-types.mjs
index 61a5dd5c1..0517c246b 100644
--- a/refactor/scripts/dash-package-types.mjs
+++ b/refactor/scripts/dash-package-types.mjs
@@ -70,7 +70,7 @@ const option: dash.Option = { quality: { getName: level => String(level.height)
       assert.equal(invalid.length, 8, 'Installed package must reject all invalid uses')
       matrix.push({ compiler: compiler.version, mode, diagnostics, invalid })
     }
-    const report = { task: 'PKG-DASH-04', scope: 'Packed current core and DASH, offline Yarn install and frozen reinstall outside workspace; isolated public type acceptance only, not complete package runtime/SDK/media release validation.', packages, matrix }
+    const report = { suite: 'dash-isolated-package-types', introducedBy: 'PKG-DASH-04', scope: 'Packed current core and DASH, offline Yarn install and frozen reinstall outside workspace; isolated public type acceptance only, not complete package runtime/SDK/media release validation.', packages, matrix }
     writeJson(path.join(output, 'report.json'), report)
     console.log(`DASH installed type matrix passed: ${matrix.length} modes, eight invalid uses rejected in each; ${output}`)
   }
diff --git a/refactor/scripts/dash-sdk-types.mjs b/refactor/scripts/dash-sdk-types.mjs
new file mode 100644
index 000000000..097346bae
--- /dev/null
+++ b/refactor/scripts/dash-sdk-types.mjs
@@ -0,0 +1,93 @@
+import assert from 'node:assert/strict'
+import fs from 'node:fs'
+import path from 'node:path'
+import process from 'node:process'
+import { fileURLToPath } from 'node:url'
+import ts from 'typescript'
+import compat from 'typescript-compat'
+import { archiveFiles, ensureArchive, hash, readMember, refactorDir } from './releases.mjs'
+
+const root = path.resolve(refactorDir, '..')
+const modes = [[ts, 'node10-commonjs'], [ts, 'nodenext-cjs'], [ts, 'nodenext-esm'], [ts, 'bundler-esm'], [compat, 'node10-commonjs']]
+
+async function copyRelease(release, directory, members) {
+  const archive = await ensureArchive(release)
+  if (!members)
+    assert.deepEqual(archiveFiles(archive), Object.keys(release.files).sort())
+  for (const member of members || Object.keys(release.files)) {
+    const bytes = readMember(archive, member)
+    assert.equal(hash(bytes), release.files[member], member)
+    const destination = path.resolve(directory, 'node_modules', release.name, member.slice('package/'.length))
+    assert(destination.startsWith(path.resolve(directory, 'node_modules') + path.sep))
+    fs.mkdirSync(path.dirname(destination), { recursive: true })
+    fs.writeFileSync(destination, bytes)
+  }
+}
+
+export async function checkDashSDKTypes() {
+  const sdkInputs = JSON.parse(fs.readFileSync(path.join(refactorDir, 'baselines/dash-sdk.json')))
+  const dependencies = JSON.parse(fs.readFileSync(path.join(refactorDir, 'baselines/dash-type-dependencies.json')))
+  const directory = fs.mkdtempSync(path.join(refactorDir, '.cache/dash-sdk-types-'))
+  const results = []
+  try {
+    for (const { release } of sdkInputs.sdks) {
+      const workspace = path.join(directory, release.version)
+      await copyRelease(release, workspace, ['package/package.json', 'package/index.d.ts'])
+      if (release.version === '5.2.1') {
+        for (const dependency of dependencies.releases)
+          await copyRelease(dependency, workspace)
+        const manifest = JSON.parse(fs.readFileSync(path.join(workspace, 'node_modules/dashjs/package.json')))
+        assert.equal(manifest.dependencies['@svta/cml-request'], '1.0.12')
+        for (const dependency of dependencies.releases) {
+          const metadata = JSON.parse(fs.readFileSync(path.join(workspace, 'node_modules', dependency.name, 'package.json')))
+          for (const [name, version] of Object.entries(metadata.peerDependencies || {}))
+            assert(dependencies.releases.some(peer => peer.name === name && peer.version === version), `Missing exact peer ${name}@${version}`)
+        }
+      }
+      const fixture = path.join(refactorDir, `fixtures/consumers/dash-sdk-v${release.version[0]}.ts`)
+      const source = fs.readFileSync(fixture, 'utf8')
+      assert(source.includes('// Candidate plugin consumer.'))
+      for (const [compiler, mode] of modes) {
+        const next = mode.startsWith('nodenext')
+        const filename = path.join(workspace, `consumer.${next ? mode.endsWith('-cjs') ? 'cts' : 'mts' : 'ts'}`)
+        const options = { strict: true, noEmit: true, skipLibCheck: false, types: [], esModuleInterop: true, target: compiler.ScriptTarget.ES2020, lib: ['lib.es2020.d.ts', 'lib.dom.d.ts'], module: next ? compiler.ModuleKind.NodeNext : mode === 'bundler-esm' ? compiler.ModuleKind.ESNext : compiler.ModuleKind.CommonJS, moduleResolution: next ? compiler.ModuleResolutionKind.NodeNext : mode === 'bundler-esm' ? compiler.ModuleResolutionKind.Bundler : compiler.ModuleResolutionKind.NodeJs }
+        function compile(code) {
+          fs.writeFileSync(filename, code)
+          const program = compiler.createProgram([filename], options)
+          const files = program.getSourceFiles().map(file => path.resolve(file.fileName))
+          assert(files.includes(path.join(workspace, 'node_modules/dashjs/index.d.ts')), 'Actual SDK declaration was not loaded')
+          const hasPlugin = files.some(file => fs.realpathSync(file) === fs.realpathSync(path.join(root, 'packages/artplayer-plugin-dash-control/types/artplayer-plugin-dash-control.d.ts')))
+          assert.equal(hasPlugin, code.includes('// Candidate plugin consumer.'), 'Only plugin consumers must load the candidate declaration')
+          const diagnostics = compiler.getPreEmitDiagnostics(program).map(item => ({
+            file: item.file ? path.relative(workspace, item.file.fileName).replaceAll('\\', '/').replace(/^consumer\.[cm]?ts$/, 'consumer.ts') : null,
+            code: item.code,
+            line: item.file && item.start !== undefined ? item.file.getLineAndCharacterOfPosition(item.start).line + 1 : null,
+            message: compiler.flattenDiagnosticMessageText(item.messageText, '\n').replaceAll(workspace.replaceAll('\\', '/'), '<consumer>').replaceAll(root.replaceAll('\\', '/'), '<workspace>'),
+          }))
+          return { diagnostics, files: files.filter(file => file.startsWith(path.join(workspace, 'node_modules'))).map(file => path.relative(workspace, file).replaceAll('\\', '/')) }
+        }
+        const sdkSource = source.split('// Candidate plugin consumer.')[0]
+          .replace(/^import .+ from '(?:artplayer|artplayer-plugin-dash-control)'\r?\n/gm, '')
+        const sdkOnly = compile(sdkSource)
+        const candidate = compile(source)
+        const invalid = compile(source.replaceAll(/\/\/ @ts-expect-error[^\n]*\n/g, ''))
+        results.push({ sdk: release.version, compiler: compiler.version, mode, sdkOnly, candidate, invalid })
+      }
+    }
+    return results
+  }
+  finally {
+    const resolved = fs.realpathSync(directory)
+    assert.equal(path.dirname(resolved), fs.realpathSync(path.join(refactorDir, '.cache')))
+    assert(path.basename(resolved).startsWith('dash-sdk-types-'))
+    fs.rmSync(resolved, { recursive: true, force: true })
+  }
+}
+
+if (process.argv[1] && path.resolve(process.argv[1]) === fileURLToPath(import.meta.url)) {
+  const results = await checkDashSDKTypes()
+  const report = path.join(refactorDir, '.cache/dash-sdk-type-diagnostics.json')
+  fs.writeFileSync(report, `${JSON.stringify(results, null, 2)}\n`)
+  console.log(results.map(row => ({ sdk: row.sdk, compiler: row.compiler, mode: row.mode, sdkOnly: row.sdkOnly.diagnostics.length, candidate: row.candidate.diagnostics.length, invalid: row.invalid.diagnostics.length })))
+  console.log(report)
+}
diff --git a/refactor/scripts/dash-sdk-types.test.mjs b/refactor/scripts/dash-sdk-types.test.mjs
new file mode 100644
index 000000000..d23ff12ea
--- /dev/null
+++ b/refactor/scripts/dash-sdk-types.test.mjs
@@ -0,0 +1,23 @@
+import assert from 'node:assert/strict'
+import fs from 'node:fs'
+import path from 'node:path'
+// eslint-disable-next-line test/no-import-node-test -- Compare exact actual SDK compiler diagnostics.
+import test from 'node:test'
+import { checkDashSDKTypes } from './dash-sdk-types.mjs'
+import { refactorDir } from './releases.mjs'
+
+test('actual DASH SDK types retain upstream diagnostics while candidate options add none', async () => {
+  const baseline = JSON.parse(fs.readFileSync(path.join(refactorDir, 'baselines/dash-sdk-type-diagnostics.json')))
+  const results = await checkDashSDKTypes()
+  assert.equal(results.length, 10)
+  assert.equal(baseline.matrix.length, results.length)
+  for (const row of results) {
+    const expected = baseline.matrix.find(item => item.sdk === row.sdk && item.compiler === row.compiler && item.mode === row.mode)
+    assert(expected, `Missing frozen SDK row ${row.sdk}/${row.compiler}/${row.mode}`)
+    assert.deepEqual(row.sdkOnly, expected.sdkOnly, 'Upstream SDK declaration diagnostics or resolved files changed')
+    assert.deepEqual(row.candidate, row.sdkOnly, 'Candidate plugin added errors to an actual SDK consumer')
+    const errors = row.invalid.diagnostics.filter(item => item.file === 'consumer.ts')
+    assert.deepEqual(errors.map(item => item.code), [2769, 2339], 'Invalid formatter return and missing SDK field must both be rejected')
+    assert.deepEqual(row.invalid.diagnostics.filter(item => item.file !== 'consumer.ts'), row.sdkOnly.diagnostics)
+  }
+})
diff --git a/refactor/scripts/releases.mjs b/refactor/scripts/releases.mjs
index 5cf8409ec..02d93285d 100644
--- a/refactor/scripts/releases.mjs
+++ b/refactor/scripts/releases.mjs
@@ -30,8 +30,8 @@ export function readMember(archive, member) {
 }
 
 export async function ensureArchive(release) {
-  assert(/^[a-z0-9]+(?:[.-][a-z0-9]+)*$/.test(release.name) && /^\d+\.\d+\.\d+$/.test(release.version), 'Invalid release identifier')
-  const archive = path.join(cacheDir, `${release.name}-${release.version}.tgz`)
+  assert(/^(?:@[a-z0-9]+(?:[.-][a-z0-9]+)*\/)?[a-z0-9]+(?:[.-][a-z0-9]+)*$/.test(release.name) && /^\d+\.\d+\.\d+$/.test(release.version), 'Invalid release identifier')
+  const archive = path.join(cacheDir, `${release.name.replace('/', '+')}-${release.version}.tgz`)
   if (!fs.existsSync(archive)) {
     const url = new URL(release.tarball)
     assert.equal(url.origin, 'https://registry.npmjs.org', 'Unexpected registry')
diff --git a/refactor/scripts/releases.test.mjs b/refactor/scripts/releases.test.mjs
index ec6edb8da..506131679 100644
--- a/refactor/scripts/releases.test.mjs
+++ b/refactor/scripts/releases.test.mjs
@@ -11,7 +11,7 @@ test('release integrity rejects corrupted bytes and inconsistent frozen digests'
 })
 
 test('release cache rejects unsafe package and version path identifiers before I/O', async () => {
-  for (const name of ['../hls.js', '.hls', 'hls..js', 'hls/js', 'hls\\js', 'hls.js/evil', '-hls'])
+  for (const name of ['../hls.js', '.hls', 'hls..js', 'hls/js', 'hls\\js', 'hls.js/evil', '-hls', '@svta/../outside', '@../outside', '@svta/cml/request', '@svta\\cml-request', '@svta+cml-request', '@svta/', '@svta/.hidden'])
     await assert.rejects(ensureArchive({ name, version: '1.5.17' }), /Invalid release identifier/)
   for (const version of ['../1.5.17', '1.5.17/evil', 'latest'])
     await assert.rejects(ensureArchive({ name: 'hls.js', version }), /Invalid release identifier/)
diff --git a/refactor/tasks.json b/refactor/tasks.json
index 7356f7f18..adfb00790 100644
--- a/refactor/tasks.json
+++ b/refactor/tasks.json
@@ -2066,7 +2066,9 @@
         "changes/2026-09-12-PKG-DASH-05-sdk-checkpoint.md",
         "baselines/dash-sdk.json",
         "baselines/dash-sdk-checkpoint.json",
-        "dash-validation.md"
+        "dash-validation.md",
+        "changes/2026-09-12-PKG-DASH-05-sdk-types.md",
+        "baselines/dash-sdk-types-validation.json"
       ]
     },
     {
diff --git a/refactor/third-party.json b/refactor/third-party.json
index 925c7a126..51d480750 100644
--- a/refactor/third-party.json
+++ b/refactor/third-party.json
@@ -1049,10 +1049,12 @@
         "packages/artplayer-plugin-dash-control/src/index.ts",
         "docs/assets/example/dash.control.js",
         "refactor/baselines/dash-sdk.json",
-        "test/browser/dash-sdk.spec.js"
+        "test/browser/dash-sdk.spec.js",
+        "refactor/baselines/dash-type-dependencies.json",
+        "refactor/scripts/dash-sdk-types.test.mjs"
       ],
       "contract": "Caller owns art.dash. Candidate adapts the released 4.x quality method surface and workspace 5.x stable representation ID surface. Controlled contracts and DOM validation pass; actual pinned 4.5.2/5.2.1 SDK media remains PKG-DASH-05.",
-      "validationStatus": "Pinned real npm 4.5.2/5.2.1, generated MPD decoding, explicit update and source replacement now exercised. DASH-SEEK-01 remains open; Windows WebKit has no MSE. SDK declarations, automatic state refresh, full formats/devices/distribution remain incomplete.",
+      "validationStatus": "Pinned real npm SDK 4.5.2/5.2.1 media exercised; DASH-SEEK-01 and Windows WebKit MSE gap remain. Actual SDK declarations and exact peer closure now tested across ten compiler/module configurations, with no added plugin errors and upstream-only Node10/old DOM limitations. Automatic state refresh, full formats/devices/distribution remain incomplete.",
       "demoPathsSource": "refactor/baselines/demo-inventory.json"
     },
     {
diff --git a/test/browser/dash-editor-types.spec.js b/test/browser/dash-editor-types.spec.js
index 13f44fdc7..40a7a110a 100644
--- a/test/browser/dash-editor-types.spec.js
+++ b/test/browser/dash-editor-types.spec.js
@@ -34,6 +34,7 @@ const dashOption: artplayerPluginDashControl.Option = {
 const oldQuality: NonNullable<Parameters<typeof artplayerPluginDashControl>[0]['quality']> = { getName: (value: object) => String(value) }
 const typedFactory: (art: Artplayer) => artplayerPluginDashControl.Result = artplayerPluginDashControl(dashOption)
 const defaultFactory = artplayerPluginDashControl()
+const unknownTrack: artplayerPluginDashControl.AudioTrack = { id: null, index: null, lang: null }
 `, 'typescript', api.Uri.parse('file:///dash-consumer.ts'))
     const invalid = api.editor.createModel('artplayerPluginDashControl({ quality: { getName: level => level.height } })', 'typescript', api.Uri.parse('file:///dash-invalid.ts'))
     try {
diff --git a/test/dash-lifecycle.test.js b/test/dash-lifecycle.test.js
index a25669340..944439def 100644
--- a/test/dash-lifecycle.test.js
+++ b/test/dash-lifecycle.test.js
@@ -6,6 +6,23 @@ import { bothMenus, dashHost, dashImplementations } from './helpers/dash-control
 const candidates = (await dashImplementations()).filter(item => item.name.startsWith('source') || item.name.startsWith('artifact'))
 const { factory } = candidates[0]
 for (const { sdk, name, factory } of candidates) {
+  test(`DASH ${sdk} (${name}): nullable SDK audio metadata retains labels and original track identity`, () => {
+    const host = dashHost(sdk)
+    const track = { id: null, index: null, lang: null }
+    host.state.tracks = [track]
+    host.state.currentTrack = track
+    factory(bothMenus())(host.art).update()
+    const menu = host.controls.get('dash-audio')
+    assert.equal(menu.html, null)
+    assert.equal(menu.selector[0].default, true)
+    assert.equal(menu.selector[0].value, track)
+    host.calls.length = 0
+    assert.equal(menu.onSelect(menu.selector[0]), null)
+    assert.equal(host.calls[0][0], 'setCurrentTrack')
+    assert.equal(host.calls[0][1], track)
+    assert.equal(host.state.currentTrack, track)
+  })
+
   test(`DASH ${sdk} (${name}): supports the original SDK method generation and stable selection keys`, () => {
     const host = dashHost(sdk)
     factory(bothMenus())(host.art).update()
diff --git a/test/types/dash-control.ts b/test/types/dash-control.ts
index 6855895e4..e465709c7 100644
--- a/test/types/dash-control.ts
+++ b/test/types/dash-control.ts
@@ -18,6 +18,7 @@ const objectConfig: Config = { getName: (item: object) => String(item) }
 dashControl({ quality: objectConfig, audio: objectConfig })
 const level: QualityLevel = { height: 720, id: 0 }
 const track: AudioTrack = { id: 'en', lang: 'en' }
+const unknownTrack: AudioTrack = { id: null, index: null, lang: null }
 
 interface CustomLevel { height: number, bandwidth: number }
 interface CustomTrack { id: number, lang: string, roles: string[] }
@@ -40,4 +41,4 @@ legacy({ quality: { control: 'yes' } })
 dashControl(null)
 // @ts-expect-error Default SDK fields cannot silently become any.
 dashControl({ quality: { getName: level => level.unknownProperty } })
-void [done, level, track, promise, invalidName]
+void [done, level, track, unknownTrack, promise, invalidName]