diff --git a/apps/core/src/components/affine/create-workspace-modal/index.tsx b/apps/core/src/components/affine/create-workspace-modal/index.tsx
index 34712ec244..e9eb1803ae 100644
--- a/apps/core/src/components/affine/create-workspace-modal/index.tsx
+++ b/apps/core/src/components/affine/create-workspace-modal/index.tsx
@@ -139,7 +139,6 @@ const SetDBLocationContent = ({
       if (result?.filePath) {
         onConfirmLocation(result.filePath);
       } else if (result?.error) {
-        // @ts-expect-error: result.error is dynamic so the type is unknown
         toast(t[result.error]());
       }
     })().catch(err => {
@@ -273,7 +272,6 @@ export const CreateWorkspaceModal = ({
           setStep('set-syncing-mode');
         } else if (result.error || result.canceled) {
           if (result.error) {
-            // @ts-expect-error: result.error is dynamic so the type is unknown
             toast(t[result.error]());
           }
           onClose();
diff --git a/apps/core/src/components/affine/new-workspace-setting-detail/export.tsx b/apps/core/src/components/affine/new-workspace-setting-detail/export.tsx
index fa31d40832..7ee0c63e31 100644
--- a/apps/core/src/components/affine/new-workspace-setting-detail/export.tsx
+++ b/apps/core/src/components/affine/new-workspace-setting-detail/export.tsx
@@ -36,7 +36,6 @@ export const ExportPanel: FC<{
     await syncBlobsToSqliteDb(workspace);
     const result = await window.apis?.dialog.saveDBFileAs(workspaceId);
     if (result?.error) {
-      // @ts-expect-error: result.error is dynamic
       toast(t[result.error]());
     } else if (!result?.canceled) {
       toast(t['Export success']());
diff --git a/apps/core/src/components/affine/new-workspace-setting-detail/storage.tsx b/apps/core/src/components/affine/new-workspace-setting-detail/storage.tsx
index 0a819e71cc..269dee42d2 100644
--- a/apps/core/src/components/affine/new-workspace-setting-detail/storage.tsx
+++ b/apps/core/src/components/affine/new-workspace-setting-detail/storage.tsx
@@ -55,7 +55,6 @@ export const StoragePanel: FC<{
         if (!result?.error && !result?.canceled) {
           toast(t['Move folder success']());
         } else if (result?.error) {
-          // @ts-expect-error: result.error is dynamic
           toast(t[result.error]());
         }
       })
diff --git a/apps/electron/src/helper/dialog/dialog.ts b/apps/electron/src/helper/dialog/dialog.ts
index d9f9add1c9..a304a4c1d0 100644
--- a/apps/electron/src/helper/dialog/dialog.ts
+++ b/apps/electron/src/helper/dialog/dialog.ts
@@ -1,6 +1,13 @@
 import path from 'node:path';
 
 import { ValidationResult } from '@affine/native';
+import type {
+  FakeDialogResult,
+  LoadDBFileResult,
+  MoveDBFileResult,
+  SaveDBFileResult,
+  SelectDBFileLocationResult,
+} from '@toeverything/infra/type';
 import fs from 'fs-extra';
 import { nanoid } from 'nanoid';
 
@@ -28,13 +35,6 @@ export async function revealDBFile(workspaceId: string) {
   await mainRPC.showItemInFolder(meta.secondaryDBPath ?? meta.mainDBPath);
 }
 
-// provide a backdoor to set dialog path for testing in playwright
-export interface FakeDialogResult {
-  canceled?: boolean;
-  filePath?: string;
-  filePaths?: string[];
-}
-
 // result will be used in the next call to showOpenDialog
 // if it is being read once, it will be reset to undefined
 let fakeDialogResult: FakeDialogResult | undefined = undefined;
@@ -53,23 +53,6 @@ export function setFakeDialogResult(result: FakeDialogResult | undefined) {
   }
 }
 
-const ErrorMessages = [
-  'DB_FILE_ALREADY_LOADED',
-  'DB_FILE_PATH_INVALID',
-  'DB_FILE_INVALID',
-  'DB_FILE_MIGRATION_FAILED',
-  'FILE_ALREADY_EXISTS',
-  'UNKNOWN_ERROR',
-] as const;
-
-type ErrorMessage = (typeof ErrorMessages)[number];
-
-export interface SaveDBFileResult {
-  filePath?: string;
-  canceled?: boolean;
-  error?: ErrorMessage;
-}
-
 const extension = 'affine';
 
 function getDefaultDBFileName(name: string, id: string) {
@@ -125,12 +108,6 @@ export async function saveDBFileAs(
   }
 }
 
-export interface SelectDBFileLocationResult {
-  filePath?: string;
-  error?: ErrorMessage;
-  canceled?: boolean;
-}
-
 export async function selectDBFileLocation(): Promise<SelectDBFileLocationResult> {
   try {
     const ret =
@@ -157,12 +134,6 @@ export async function selectDBFileLocation(): Promise<SelectDBFileLocationResult
   }
 }
 
-export interface LoadDBFileResult {
-  workspaceId?: string;
-  error?: ErrorMessage;
-  canceled?: boolean;
-}
-
 /**
  * This function is called when the user clicks the "Load" button in the "Load Workspace" dialog.
  *
@@ -255,12 +226,6 @@ export async function loadDBFile(): Promise<LoadDBFileResult> {
   }
 }
 
-export interface MoveDBFileResult {
-  filePath?: string;
-  error?: ErrorMessage;
-  canceled?: boolean;
-}
-
 /**
  * This function is called when the user clicks the "Move" button in the "Move Workspace Storage" setting.
  *
diff --git a/packages/infra/src/type.ts b/packages/infra/src/type.ts
index a3334da36a..d4ee55b1f1 100644
--- a/packages/infra/src/type.ts
+++ b/packages/infra/src/type.ts
@@ -105,9 +105,9 @@ export type DBHandlers = {
     key: string,
     data: Uint8Array
   ) => Promise<void>;
-  getBlob: (workspaceId: string, key: string) => Promise<any>;
+  getBlob: (workspaceId: string, key: string) => Promise<Buffer | null>;
   deleteBlob: (workspaceId: string, key: string) => Promise<void>;
-  getBlobKeys: (workspaceId: string) => Promise<any>;
+  getBlobKeys: (workspaceId: string) => Promise<string[]>;
   getDefaultStorageLocation: () => Promise<string>;
 };
 
@@ -116,13 +116,55 @@ export type DebugHandlers = {
   logFilePath: () => Promise<string>;
 };
 
+export type ErrorMessage =
+  | 'DB_FILE_ALREADY_LOADED'
+  | 'DB_FILE_PATH_INVALID'
+  | 'DB_FILE_INVALID'
+  | 'DB_FILE_MIGRATION_FAILED'
+  | 'FILE_ALREADY_EXISTS'
+  | 'UNKNOWN_ERROR';
+
+export interface LoadDBFileResult {
+  workspaceId?: string;
+  error?: ErrorMessage;
+  canceled?: boolean;
+}
+
+export interface SaveDBFileResult {
+  filePath?: string;
+  canceled?: boolean;
+  error?: ErrorMessage;
+}
+
+export interface SelectDBFileLocationResult {
+  filePath?: string;
+  error?: ErrorMessage;
+  canceled?: boolean;
+}
+
+export interface MoveDBFileResult {
+  filePath?: string;
+  error?: ErrorMessage;
+  canceled?: boolean;
+}
+
+// provide a backdoor to set dialog path for testing in playwright
+export interface FakeDialogResult {
+  canceled?: boolean;
+  filePath?: string;
+  filePaths?: string[];
+}
+
 export type DialogHandlers = {
-  revealDBFile: (workspaceId: string) => Promise<any>;
-  loadDBFile: () => Promise<any>;
-  saveDBFileAs: (workspaceId: string) => Promise<any>;
-  moveDBFile: (workspaceId: string, dbFileLocation?: string) => Promise<any>;
-  selectDBFileLocation: () => Promise<any>;
-  setFakeDialogResult: (result: any) => Promise<any>;
+  revealDBFile: (workspaceId: string) => Promise<void>;
+  loadDBFile: () => Promise<LoadDBFileResult>;
+  saveDBFileAs: (workspaceId: string) => Promise<SaveDBFileResult>;
+  moveDBFile: (
+    workspaceId: string,
+    dbFileLocation?: string
+  ) => Promise<MoveDBFileResult>;
+  selectDBFileLocation: () => Promise<SelectDBFileLocationResult>;
+  setFakeDialogResult: (result: any) => Promise<FakeDialogResult>;
 };
 
 export type UIHandlers = {