langchain.js
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    Class InMemoryStore<T>

    In-memory implementation of the BaseStore using a dictionary. Used for storing key-value pairs in memory.

    const store = new InMemoryStore<BaseMessage>();
    await store.mset(
      Array.from({ length: 5 }).map((_, index) => [
        `message:id:${index}`,
        index % 2 === 0
          ? new AIMessage("ai stuff...")
          : new HumanMessage("human stuff..."),
      ]),
    );

    const retrievedMessages = await store.mget(["message:id:0", "message:id:1"]);
    await store.mdelete(await store.yieldKeys("message:id:").toArray());

    Type Parameters

    • T = any

    Hierarchy (View Summary)

    Index

    Constructors

    constructor

    Properties

    lc_kwargs lc_namespace lc_serializable store

    Accessors

    lc_aliases lc_attributes lc_id lc_secrets lc_serializable_keys

    Methods

    mdelete mget mset toJSON toJSONNotImplemented yieldKeys lc_name

    Constructors

    • Type Parameters

      • T = any

      Parameters

      • Optionalkwargs: SerializedFields
      • ..._args: never[]

      Returns InMemoryStore<T>

    Properties

    lc_kwargs: SerializedFields
    lc_namespace: string[] = ...

    A path to the module that contains the class, eg. ["langchain", "llms"] Usually should be the same as the entrypoint the class is exported from.

    lc_serializable: boolean = false
    store: Record<string, T> = {}

    Accessors

    • get lc_aliases(): undefined | { [key: string]: string }

      A map of aliases for constructor args. Keys are the attribute names, e.g. "foo". Values are the alias that will replace the key in serialization. This is used to eg. make argument names match Python.

      Returns undefined | { [key: string]: string }

    • get lc_attributes(): undefined | SerializedFields

      A map of additional attributes to merge with constructor args. Keys are the attribute names, e.g. "foo". Values are the attribute values, which will be serialized. These attributes need to be accepted by the constructor as arguments.

      Returns undefined | SerializedFields

    • get lc_id(): string[]

      The final serialized identifier for the module.

      Returns string[]

    • get lc_secrets(): undefined | { [key: string]: string }

      A map of secrets, which will be omitted from serialization. Keys are paths to the secret in constructor args, e.g. "foo.bar.baz". Values are the secret ids, which will be used when deserializing.

      Returns undefined | { [key: string]: string }

    • get lc_serializable_keys(): undefined | string[]

      A manual list of keys that should be serialized. If not overridden, all fields passed into the constructor will be serialized.

      Returns undefined | string[]

    Methods

    • Deletes the given keys and their associated values from the store.

      Parameters

      • keys: string[]

        Keys to delete from the store.

      Returns Promise<void>

      Promise that resolves when all keys have been deleted.

    • Retrieves the values associated with the given keys from the store.

      Parameters

      • keys: string[]

        Keys to retrieve values for.

      Returns Promise<T[]>

      Array of values associated with the given keys.

    • Sets the values for the given keys in the store.

      Parameters

      • keyValuePairs: [string, T][]

        Array of key-value pairs to set in the store.

      Returns Promise<void>

      Promise that resolves when all key-value pairs have been set.

    • Asynchronous generator that yields keys from the store. If a prefix is provided, it only yields keys that start with the prefix.

      Parameters

      • Optionalprefix: string

        Optional prefix to filter keys.

      Returns AsyncGenerator<string>

      AsyncGenerator that yields keys from the store.

    • The name of the serializable. Override to provide an alias or to preserve the serialized module name in minified environments.

      Implemented as a static method to support loading logic.

      Returns string

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