Server side changes to render diff view

Summary: Adding server side changes to support rendering diff view from VS-ISL

Reviewed By: evangrayk

Differential Revision: D75636068

fbshipit-source-id: 82584e991d287c8decd396d9c801a4a3a93d066a

Author: ViniGupta08

addons/isl/src/platform/visualStudioPlatform.ts

@@ -5,6 +5,8 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+import * as pathModule from 'path';
+import type {Comparison} from '../../../shared/Comparison';
 import type {Platform} from '../platform';
 import type {OneIndexedLineNumber, RepoRelativePath} from '../types';
 
@@ -14,6 +16,7 @@ declare global {
   interface Window {
     __vsIdeBridge: {
       openFileInVisualStudio: (path: string, line?: number, col?: number) => void;
+      openDiffInVisualStudio: (path: string, comparison: Comparison) => void;
     };
   }
 }
@@ -48,6 +51,16 @@ const visualStudioPlatform: Platform = {
       }
     }
   },
+  openDiff: async (path: RepoRelativePath, comparison: Comparison) => {
+    if (window.__vsIdeBridge && window.__vsIdeBridge.openDiffInVisualStudio) {
+      const helpers = await import('./platformHelpers');
+      const repoRoot = helpers.getRepoRoot();
+      if (repoRoot) {
+        const fullPath = pathModule.join(repoRoot, path);
+        window.__vsIdeBridge.openDiffInVisualStudio(fullPath, comparison);
+      }
+    }
+  },
   canCustomizeFileOpener: false,
   upsellExternalMergeTool: false,