Migrate file api ops to ts

app/src/types/fileApi.ts

@@ -0,0 +1,73 @@
+export interface LookupResponse {
+  paths: string[];
+}
+
+export function isLookupResponse(obj: unknown): obj is LookupResponse {
+  return (
+    typeof obj === 'object' &&
+    obj !== null &&
+    'paths' in obj &&
+    Array.isArray((obj as LookupResponse).paths) &&
+    (obj as LookupResponse).paths.every((path) => typeof path === 'string')
+  );
+}
+
+export interface SaveFileResponse {
+  filePath: string;
+  size: number;
+  updatedAt: string; // ISO 8601 string representation of the date
+}
+
+export function isSaveFileResponse(obj: unknown): obj is SaveFileResponse {
+  return (
+    typeof obj === 'object' &&
+    obj !== null &&
+    'filePath' in obj &&
+    typeof (obj as SaveFileResponse).filePath === 'string' &&
+    'size' in obj &&
+    typeof (obj as SaveFileResponse).size === 'number' &&
+    'updatedAt' in obj &&
+    typeof (obj as SaveFileResponse).updatedAt === 'string'
+  );
+}
+
+export interface LastOpenedFileResponse {
+  lastOpenedFilePath: string;
+}
+
+export function isLastOpenedFileResponse(
+  obj: unknown
+): obj is LastOpenedFileResponse {
+  return (
+    typeof obj === 'object' &&
+    obj !== null &&
+    'lastOpenedFilePath' in obj &&
+    typeof (obj as LastOpenedFileResponse).lastOpenedFilePath === 'string'
+  );
+}
+
+export interface UpdateLastOpenedFileRequest {
+  filePath: string;
+}
+
+export interface FileNode {
+  id: string;
+  name: string;
+  path: string;
+  children: FileNode[];
+}
+
+export function isFileNode(obj: unknown): obj is FileNode {
+  return (
+    typeof obj === 'object' &&
+    obj !== null &&
+    'id' in obj &&
+    typeof (obj as FileNode).id === 'string' &&
+    'name' in obj &&
+    typeof (obj as FileNode).name === 'string' &&
+    'path' in obj &&
+    typeof (obj as FileNode).path === 'string' &&
+    'children' in obj &&
+    Array.isArray((obj as FileNode).children)
+  );
+}