fix: harden performance survey xlsx downloads

lib/__tests__/performance-survey-dashboard-export.test.ts

@@ -2,7 +2,9 @@ import ExcelJS from 'exceljs'
 import {
   buildPerformanceSurveyDashboardWorkbook,
   buildPerformanceSurveyExportTable,
+  choosePerformanceSurveyExportDestination,
   sanitizePerformanceSurveyExportFileName,
+  savePerformanceSurveyDashboardWorkbook,
   type PerformanceSurveyDashboardExportData,
 } from '@/lib/performance-survey-dashboard-export'
 
@@ -85,4 +87,44 @@ describe('performance survey dashboard xlsx export', () => {
     expect(sanitizePerformanceSurveyExportFileName('考核:品牌/设计*主管'))
       .toBe('考核_品牌_设计_主管.xlsx')
   })
+
+  test('keeps the browser context when opening the native save picker', async () => {
+    const handle = { createWritable: jest.fn() }
+    const picker = jest.fn(function (this: unknown) {
+      expect(this).toBe(window)
+      return Promise.resolve(handle)
+    })
+    Object.defineProperty(window, 'showSaveFilePicker', {
+      configurable: true,
+      value: picker,
+    })
+
+    await expect(choosePerformanceSurveyExportDestination('考核调研.xlsx'))
+      .resolves.toEqual({ kind: 'file-system', handle })
+    expect(picker).toHaveBeenCalledWith(expect.objectContaining({
+      suggestedName: '考核调研.xlsx',
+    }))
+
+    delete (window as typeof window & { showSaveFilePicker?: unknown }).showSaveFilePicker
+  })
+
+  test('uses a native blob download when the save picker is unavailable', async () => {
+    const createObjectURL = jest.fn(() => 'blob:performance-survey-export')
+    const revokeObjectURL = jest.fn()
+    Object.defineProperty(URL, 'createObjectURL', { configurable: true, value: createObjectURL })
+    Object.defineProperty(URL, 'revokeObjectURL', { configurable: true, value: revokeObjectURL })
+    const click = jest.spyOn(HTMLAnchorElement.prototype, 'click').mockImplementation(() => {})
+
+    await savePerformanceSurveyDashboardWorkbook(
+      exportData,
+      '考核调研_品牌创意主管_2026-07.xlsx',
+      { kind: 'download' },
+    )
+
+    expect(createObjectURL).toHaveBeenCalledWith(expect.any(Blob))
+    expect(click).toHaveBeenCalledTimes(1)
+    await new Promise((resolve) => window.setTimeout(resolve, 0))
+    expect(revokeObjectURL).toHaveBeenCalledWith('blob:performance-survey-export')
+    click.mockRestore()
+  })
 })

lib/performance-survey-dashboard-export.ts

@@ -211,7 +211,7 @@ export async function choosePerformanceSurveyExportDestination(
   if (!picker) return { kind: 'download' }
 
   try {
-    const handle = await picker({
+    const handle = await picker.call(window, {
       suggestedName,
       types: [{
         description: 'WPS/Excel 工作簿',
@@ -243,6 +243,26 @@ export async function savePerformanceSurveyDashboardWorkbook(
     return
   }
 
-  const { saveAs } = await import('file-saver')
-  saveAs(blob, fileName)
+  if (
+    typeof document === 'undefined'
+    || typeof URL === 'undefined'
+    || typeof URL.createObjectURL !== 'function'
+  ) {
+    throw new Error('当前浏览器无法创建下载文件，请更换 Chrome 或 Edge 后重试。')
+  }
+
+  const objectUrl = URL.createObjectURL(blob)
+  const anchor = document.createElement('a')
+  anchor.href = objectUrl
+  anchor.download = fileName
+  anchor.rel = 'noopener'
+  anchor.style.display = 'none'
+  document.body.appendChild(anchor)
+
+  try {
+    anchor.click()
+  } finally {
+    anchor.remove()
+    window.setTimeout(() => URL.revokeObjectURL(objectUrl), 0)
+  }
 }