Implement fs.stat and fs.readlink

Summary: Fixes issue for the stackTraceMapper

Reviewed By: aigoncharov

Differential Revision: D32987161

fbshipit-source-id: 660f49a1bdf61b2fd2963874ef23dfd284f71128

desktop/flipper-common/src/server-types.tsx

@@ -132,6 +132,21 @@ export type IOSDeviceParams = {
   state?: string;
 };
 
+// Serializable subset of StatsBase from fs.d.ts
+export interface FSStatsLike {
+  isFile: boolean;
+  isDirectory: boolean;
+  isSymbolicLink: boolean;
+  mode: number;
+  uid: number;
+  gid: number;
+  size: number;
+  atimeMs: number;
+  mtimeMs: number;
+  ctimeMs: number;
+  birthtimeMs: number;
+}
+
 export type FlipperServerCommands = {
   'node-api-fs-access': (path: string, mode?: number) => Promise<void>;
   'node-api-fs-pathExists': (path: string, mode?: number) => Promise<boolean>;
@@ -146,6 +161,8 @@ export type FlipperServerCommands = {
     dest: string,
     flags?: number,
   ) => Promise<void>;
+  'node-api-fs-stat': (path: string) => Promise<FSStatsLike>;
+  'node-api-fs-readlink': (path: string) => Promise<string>;
   /**
    * @throws ExecError
    */