Retrieve VoiceOver version (via macOS version)

lib/modules/macos/session.js

@@ -2,18 +2,38 @@
 
 'use strict';
 
+const child_process = require('child_process');
+
 const { v4: uuid } = require('uuid');
 
+/**
+ * @returns {Promise<string>}
+ */
+const getMacOSVersion = async () => {
+  return new Promise((resolve, reject) => {
+    child_process.exec('sw_vers -productVersion', (error, stdout, stderr) => {
+      if (error) {
+        reject(new Error(stderr));
+        return;
+      }
+      resolve(stdout.trim());
+    });
+  });
+};
+
 const newSession = /** @type {ATDriverModules.SessionNewSession} */ (
-  (websocket, params) => {
+  async (websocket, params) => {
     // TODO: match requested capabilities
     // const { capabilities } = params;
     websocket.sessionId = uuid();
+
     return {
       sessionId: websocket.sessionId,
       capabilities: {
         atName: 'Voiceover',
-        atVersion: 'TODO',
+        // The ARIA-AT Community Group considers the MacOS version identifier
+        // to be an accurate identifier for the VoiceOver screen reader.
+        atVersion: await getMacOSVersion(),
         platformName: 'macos',
       },
     };