Add remote fs API

Summary: Changelog: Expose Flipper Server FS access to Flipper plugins

Reviewed By: lblasa

Differential Revision: D32883144

fbshipit-source-id: 47637b61849ef60a2d8fe91a0a28d2a358e0b8c4

desktop/flipper-server-core/src/FlipperServerImpl.tsx

@@ -44,6 +44,7 @@ import {
   internGraphPOSTAPIRequest,
 } from './fb-stubs/internRequests';
 import {commandNodeApiExec} from './commands/NodeApiExec';
+import {access, copyFile, mkdir, unlink} from 'fs/promises';
 
 export const SERVICE_FLIPPER = 'flipper.oAuthToken';
 
@@ -215,6 +216,18 @@ export class FlipperServerImpl implements FlipperServer {
 
   private commandHandler: FlipperServerCommands = {
     'node-api-exec': commandNodeApiExec,
+    'node-api-fs-access': access,
+    'node-api-fs-pathExists': async (path, mode) => {
+      try {
+        await access(path, mode);
+        return true;
+      } catch {
+        return false;
+      }
+    },
+    'node-api-fs-unlink': unlink,
+    'node-api-fs-mkdir': mkdir,
+    'node-api-fs-copyFile': copyFile,
     'get-config': async () => this.config,
     'get-changelog': getChangelog,
     'device-list': async () => {