Documentation and deletion of config files

Deleted the yarn lock file and added documentation for our implementation of the Firebase Checkpoint Saver

libs/checkpoint-firebase/README.md

@@ -0,0 +1,109 @@
+# @langchain/langgraph-checkpoint-firebase
+
+Implementation of a [LangGraph.js](https://github.com/langchain-ai/langgraphjs) CheckpointSaver that uses a FireBase instance.
+
+The `FirebaseSaver` class is an implementation of the `BaseCheckpointSaver` interface that uses Firebase Realtime Database for persistence. It is part of the `@langchain/langgraph-checkpoint` library and provides scalable, real-time management of checkpoints in LangGraph.js.
+
+---
+
+## Features
+
+- **Firebase Persistence**: Leverages Firebase's real-time capabilities to store checkpoints and metadata.
+- **Thread Management**: Isolates states using thread-based checkpointing for multi-tenant or parallel use cases.
+- **Pending Writes**: Handles intermediate writes for partially executed graph nodes.
+- **Real-Time Updates**: Takes advantage of Firebase's dynamic data updates for live applications.
+
+---
+
+## Installation
+
+### Prerequisites
+- Firebase Realtime Database instance
+- Node.js with TypeScript
+
+### Install Dependencies
+```bash
+npm install @langchain/langgraph-checkpoint firebase
+
+### Usage
+
+```ts
+import { initializeApp } from "firebase/app";
+import { getDatabase } from "firebase/database";
+import { FirebaseSaver } from "@langchain/langgraph-checkpoint-firebase";
+
+const writeConfig = {
+  configurable: {
+    thread_id: "1",
+    checkpoint_ns: ""
+  }
+};
+const readConfig = {
+  configurable: {
+    thread_id: "1"
+  }
+};
+
+const writeConfig = {
+  configurable: {
+    thread_id: "1",
+    checkpoint_ns: ""
+  }
+};
+const readConfig = {
+  configurable: {
+    thread_id: "1"
+  }
+};
+
+const firebaseConfig = {
+      apiKey: "REPLACE-WITH-YOUR-API-KEY",
+      authDomain: "REPLACE-WITH-YOUR-localhost",
+      projectId: "REPLACE-WITH-YOUR-TEST-PROJECT",
+      databaseURL: process.env.FIREBASEURL || "http://localhost:9000", // Use emulator URL
+    };
+    process.env.FIREBASE_URL = process.env.FIREBASEURL || "http://localhost:9000"
+    const app = initializeApp(firebaseConfig);
+
+    database = getDatabase(app);
+
+const checkpoint = {
+  v: 1,
+  ts: "2024-07-31T20:14:19.804150+00:00",
+  id: "1ef4f797-8335-6428-8001-8a1503f9b875",
+  channel_values: {
+    my_key: "meow",
+    node: "node"
+  },
+  channel_versions: {
+    __start__: 2,
+    my_key: 3,
+    start:node: 3,
+    node: 3
+  },
+  versions_seen: {
+    __input__: {},
+    __start__: {
+      __start__: 1
+    },
+    node: {
+      start:node: 2
+    }
+  },
+  pending_sends: [],
+}
+
+// store checkpoint
+await checkpointer.put(writeConfig, checkpoint, {}, {});
+
+// load checkpoint
+await checkpointer.get(readConfig);
+
+// list checkpoints
+for await (const checkpoint of checkpointer.list(readConfig)) {
+  console.log(checkpoint);
+}
+
+await client.close();
+```
+

libs/checkpoint-firebase/src/index.ts

@@ -9,8 +9,6 @@ import {
   type SerializerProtocol,
   type PendingWrite,
   type CheckpointMetadata,
-  //type ChannelVersions,
-  //WRITES_IDX_MAP,
   copyCheckpoint,
   CheckpointPendingWrite,
 } from "@langchain/langgraph-checkpoint";