ai/src/generate-text/reasoning.ts

AI SDK by Vercel - The AI Toolkit for TypeScript and JavaScript

import { ReasoningPart } from '@ai-sdk/provider-utils';

export function asReasoningText(
  reasoningParts: Array<ReasoningPart>,
): string | undefined {
  const reasoningText = reasoningParts.map(part => part.text).join('');
  return reasoningText.length > 0 ? reasoningText : undefined;
}