LangChain Reference home pageLangChain ReferenceLangChain Reference
  • GitHub
  • Main Docs
Deep Agents
LangChain
LangGraph
Integrations
LangSmith
LangGraph
  • Web
  • Channels
  • Pregel
  • Prebuilt
  • Remote
React SDK
Vue SDK
Svelte SDK
Angular SDK
LangGraph SDK
  • Ui
  • Client
  • Auth
  • React
  • Logging
  • React Ui
  • Utils
  • Server
LangGraph Checkpoint
LangGraph Checkpoint MongoDB
LangGraph Checkpoint Postgres
  • Store
LangGraph Checkpoint Redis
  • Shallow
  • Store
LangGraph Checkpoint SQLite
LangGraph Checkpoint Validation
  • Cli
LangGraph API
LangGraph CLI
LangGraph CUA
  • Utils
LangGraph Supervisor
LangGraph Swarm
⌘I

LangChain Assistant

Ask a question to get started

Enter to send•Shift+Enter new line

Menu

LangGraph
WebChannelsPregelPrebuiltRemote
React SDK
Vue SDK
Svelte SDK
Angular SDK
LangGraph SDK
UiClientAuthReactLoggingReact UiUtilsServer
LangGraph Checkpoint
LangGraph Checkpoint MongoDB
LangGraph Checkpoint Postgres
Store
LangGraph Checkpoint Redis
ShallowStore
LangGraph Checkpoint SQLite
LangGraph Checkpoint Validation
Cli
LangGraph API
LangGraph CLI
LangGraph CUA
Utils
LangGraph Supervisor
LangGraph Swarm
Language
Theme
JavaScript@langchain/angularStreamService
Classā—Since v0.1

StreamService

Injectable Angular service that wraps injectStream.

Extend this class with your own @Injectable() service and call super(options) in the constructor:

\@Injectable({ providedIn: 'root' })
export class ChatService extends StreamService {
  constructor() {
    super({ assistantId: 'agent', apiUrl: '...' });
  }
}

The service exposes the same signals and methods as injectStream (e.g. values, messages, isLoading, submit, stop).

Must be created within an Angular injection context (via DI or runInInjectionContext).

Copy
class StreamService

Constructors

constructor
constructor→ StreamService<T, Bag>

Properties

property
activeSubagents: SubagentStreamInterface<Record<string, unknown>, DefaultToolCall, string>[]
property
assistantId: string
property
branch: WritableSignal<string>
property
client: Client
property
error: Signal<unknown>
property
experimental_branchTree: Signal<unknown>
property
history: Signal<unknown>
property
interrupt: Signal<Interrupt<GetInterruptType<Bag>> | undefined>
property
interrupts: Signal<Interrupt<GetInterruptType<Bag>>[]>
property
isLoading: WritableSignal<boolean>
property
isThreadLoading: Signal<boolean>
property
messages: Signal<BaseMessage<MessageStructure<MessageToolSet>, MessageType>[]>
property
queue: __type
property
subagents: Map<string, SubagentStreamInterface<Record<string, unknown>, DefaultToolCall, string>>
property
toolCalls: Signal<ToolCallWithResult<DefaultToolCall>[]>
property
values: Signal<T>

Methods

method
getMessagesMetadata→ MessageMetadata<T extends Record<string, unknown> ? T<T> : Record<string, unknown>> | undefined
method
getSubagent→ SubagentStreamInterface<Record<string, unknown>, DefaultToolCall, string> | undefined
method
getSubagentsByMessage→ SubagentStreamInterface<Record<string, unknown>, DefaultToolCall, string>[]
method
getSubagentsByType→ SubagentStreamInterface<Record<string, unknown>, DefaultToolCall, string>[]
method
getToolCalls→ ToolCallWithResult<DefaultToolCall>[]
method
joinStream→ Promise<void>
method
setBranch
method
stop→ Promise<void>
method
submit→ Promise<void>
method
switchThread
View source on GitHub