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The main stream object returned by chat model streaming.
Implements AsyncIterable<ChatModelStreamEvent> for raw event access and PromiseLike<AIMessage> for simple await usage.
AsyncIterable<ChatModelStreamEvent>
PromiseLike<AIMessage>
await
Typed stream for reasoning content (chain-of-thought). Same interface as TextContentStream but for reasoning blocks.
Typed stream for text content.
.full
Typed stream for tool calls.
ToolCall
Typed stream for usage metadata.
Typed stream classes for chat model streaming.
import { ... } from "@langchain/core/language_models/stream";