Improve simulation of key presses in macOS

lib/helpers/macos/applescript.js

@@ -52,18 +52,24 @@ const INDENT = '    ';
  */
 exports.renderScript = function (command) {
   validateCommand(command);
+  // Key presses must be scripted as a nested series of "key down"/"key up"
+  // commands rather than a linear sequence of "key code" commands because
+  // VoiceOver does not recognize key combinations using the latter API (e.g.
+  // `key code {123, 124}`).
   const renderedKeyCodeLines = command.keyCodes
-    .map(code => {
-      const renderedKeyCode = KeyCode[code].toString();
-      const renderedModifiers = renderModifiers(command);
-      return `
-${INDENT}${INDENT}key code ${renderedKeyCode}${renderedModifiers}`;
-    })
-    .join('');
+    .reverse()
+    .map((code) => KeyCode[code].toString())
+    .reduce((accum, next) => `key down ${next}\n${accum}\nkey up ${next}`, '')
+    .split('\n')
+    .map((line) => `${INDENT}${INDENT}${line}`)
+    .join('\n');
+
   const script = `with timeout of ${APPLESCRIPT_TIMEOUT} seconds
-${INDENT}tell application "System Events"${renderedKeyCodeLines}
+${INDENT}tell application "System Events"
+${renderedKeyCodeLines}
 ${INDENT}end tell
 end timeout`;
+
   return applescript(script);
 
   /**