Function emitReasoningPart

packages/ai/openrouter/src/OpenRouterLanguageModel.ts:768–793

(delta: string, metadata: OpenRouterReasoningInfo | undefined = undefined)

        // Reasoning Parts

        const emitReasoningPart = (delta: string, metadata: OpenRouterReasoningInfo | undefined = undefined) => {
          // End in-progress text part if present before starting reasoning
          if (Predicate.isNotUndefined(activeTextId)) {
            parts.push({
              type: "text-end",
              id: activeTextId
            })
            activeTextId = undefined
          }
          // Start a new reasoning part if necessary
          if (Predicate.isUndefined(activeReasoningId)) {
            activeReasoningId = (idCounter++).toString()
            parts.push({
              type: "reasoning-start",
              id: activeReasoningId,
              metadata: { openrouter: metadata }
            })
          }
          // Emit the reasoning delta
          parts.push({
            type: "reasoning-delta",
            id: activeReasoningId,
            delta,
            metadata: { openrouter: metadata }
          })
        }

        if (Predicate.isNotNullable(delta?.reasoning_details) && delta.reasoning_details.length > 0) {
          for (const detail of delta.reasoning_details) {