diff --git a/apps/backend/src/services/session/session-proof-html.js b/apps/backend/src/services/session/session-proof-html.ts
similarity index 93%
rename from apps/backend/src/services/session/session-proof-html.js
rename to apps/backend/src/services/session/session-proof-html.ts
index afe0eb3a..31f5d32b 100644
--- a/apps/backend/src/services/session/session-proof-html.js
+++ b/apps/backend/src/services/session/session-proof-html.ts
@@ -1,4 +1,16 @@
-export function buildProofHtml({ redeemImageBase64, timeImageBase64, redeemMessage, timePageUrl }) {
+export type ProofHtmlInput = {
+  redeemImageBase64: string
+  timeImageBase64: string
+  redeemMessage?: string
+  timePageUrl: string
+}
+
+export function buildProofHtml({
+  redeemImageBase64,
+  timeImageBase64,
+  redeemMessage,
+  timePageUrl,
+}: ProofHtmlInput): string {
   const capturedAt = new Date().toLocaleString('zh-CN', {
     hour12: false,
     timeZone: 'Asia/Shanghai',
@@ -159,7 +171,7 @@ export function buildProofHtml({ redeemImageBase64, timeImageBase64, redeemMessa
 </html>`
 }
 
-export function escapeHtml(value) {
+export function escapeHtml(value: unknown): string {
   return String(value || '')
     .replaceAll('&', '&amp;')
     .replaceAll('<', '&lt;')
diff --git a/apps/backend/src/services/session/session-proof-renderer.js b/apps/backend/src/services/session/session-proof-renderer.ts
similarity index 75%
rename from apps/backend/src/services/session/session-proof-renderer.js
rename to apps/backend/src/services/session/session-proof-renderer.ts
index 97a88f49..891d5735 100644
--- a/apps/backend/src/services/session/session-proof-renderer.js
+++ b/apps/backend/src/services/session/session-proof-renderer.ts
@@ -1,14 +1,37 @@
-// @ts-nocheck
+/// <reference lib="dom" />
 
 import fs from 'node:fs/promises'
 
 import { buildProofHtml } from './session-proof-html.js'
 
-export async function showResultDialog(page, message) {
+type BrowserPageLike = {
+  evaluate: <T = unknown>(callback: any, arg?: unknown) => Promise<T>
+  waitForTimeout: (milliseconds: number) => Promise<void>
+  setViewportSize: (viewport: { width: number; height: number }) => Promise<void>
+  setContent: (html: string, options?: { waitUntil?: string }) => Promise<unknown>
+  screenshot: (options: { path: string; fullPage?: boolean }) => Promise<unknown>
+  close: () => Promise<void>
+}
+
+type BrowserContextLike = {
+  newPage: () => Promise<BrowserPageLike>
+}
+
+type ComposeProofScreenshotOptions = {
+  outputPath: string
+  redeemImagePath: string
+  timeImagePath: string
+  redeemMessage?: string
+  timePageUrl: string
+}
+
+export async function showResultDialog(page: BrowserPageLike, message: string): Promise<void> {
   await page.evaluate((text) => {
     document.querySelectorAll('iframe').forEach((element) => element.remove())
     document.querySelectorAll('.pop').forEach((element) => {
-      element.style.display = 'none'
+      if (element instanceof HTMLElement) {
+        element.style.display = 'none'
+      }
     })
 
     let card = document.getElementById('codex-redeem-result')
@@ -80,9 +103,9 @@ export async function showResultDialog(page, message) {
 }
 
 export async function composeProofScreenshot(
-  browserContext,
-  { outputPath, redeemImagePath, timeImagePath, redeemMessage, timePageUrl },
-) {
+  browserContext: BrowserContextLike,
+  { outputPath, redeemImagePath, timeImagePath, redeemMessage, timePageUrl }: ComposeProofScreenshotOptions,
+): Promise<void> {
   const [redeemImageBase64, timeImageBase64] = await Promise.all([
     fs.readFile(redeemImagePath, 'base64'),
     fs.readFile(timeImagePath, 'base64'),
diff --git a/apps/backend/src/services/session/session-proof-result-writer.js b/apps/backend/src/services/session/session-proof-result-writer.ts
similarity index 58%
rename from apps/backend/src/services/session/session-proof-result-writer.js
rename to apps/backend/src/services/session/session-proof-result-writer.ts
index e259334a..2910933e 100644
--- a/apps/backend/src/services/session/session-proof-result-writer.js
+++ b/apps/backend/src/services/session/session-proof-result-writer.ts
@@ -1,11 +1,29 @@
-// @ts-nocheck
-
 import fs from 'node:fs/promises'
 
-import { BAIDU_BEIJING_TIME_URL } from './session-proof-constants.js'
+import { BAIDU_BEIJING_TIME_URL, type RedeemProofMode } from './session-proof-constants.js'
+
+type RedeemResultFilePayload = {
+  proofMode: RedeemProofMode
+  sessionId?: string
+  activityUrl: string
+  code: string
+  finalResult?: {
+    role?: {
+      area?: string
+    }
+    [key: string]: unknown
+  } | null
+  attempts?: unknown[]
+  screenshotPath: string
+  htmlPath?: string
+  redeemPageScreenshotPath?: string
+  beijingTimeScreenshotPath?: string
+  beijingTimePageUrl?: string
+  beijingTimeError?: string
+}
 
 export async function writeRedeemResultFile(
-  resultPath,
+  resultPath: string,
   {
     proofMode,
     sessionId,
@@ -19,8 +37,8 @@ export async function writeRedeemResultFile(
     beijingTimeScreenshotPath = '',
     beijingTimePageUrl = BAIDU_BEIJING_TIME_URL,
     beijingTimeError = '',
-  },
-) {
+  }: RedeemResultFilePayload,
+): Promise<void> {
   await fs.writeFile(
     resultPath,
     JSON.stringify(
diff --git a/docs/backend-typescript-migration-plan.md b/docs/backend-typescript-migration-plan.md
index af2a2f05..5b2f5c47 100644
--- a/docs/backend-typescript-migration-plan.md
+++ b/docs/backend-typescript-migration-plan.md
@@ -408,6 +408,16 @@
     - `npm run typecheck`
     - `npm run build`
     - `npm test` 共 139 个用例通过
+77. 腾讯浏览器会话 proof 渲染 / 结果写入模块迁移到 `.ts`：
+    - `src/services/session/session-proof-html.ts`
+    - `src/services/session/session-proof-renderer.ts`
+    - `src/services/session/session-proof-result-writer.ts`
+78. 凭证 HTML 输入、结果 JSON payload、浏览器截图合成上下文、页面弹窗渲染已显式类型化
+79. Docker 内验证通过：
+    - `src/services/session/session-proof.test.js` 共 4 个用例通过
+    - `npm run typecheck`
+    - `npm run build`
+    - `npm test` 共 139 个用例通过
 
 ## 下一步建议