Function readString

packages/ai-grok/src/realtime/adapter.ts:25–31

* Runtime-checked field readers for untyped server events. Replace the * drive-by `event.X as string` / `event.X as Record ` casts * with readers that return `undefined` when the shape doesn't match, so a * malformed frame can't throw a TypeError inside `handleServerEvent`.

(
  obj: Record<string, unknown>,
  key: string,
)

 * malformed frame can't throw a TypeError inside `handleServerEvent`.
 */
function readString(
  obj: Record<string, unknown>,
  key: string,
): string | undefined {
  const value = obj[key]
  return typeof value === 'string' ? value : undefined
}

function readObject(
  obj: Record<string, unknown>,