feat(app): add new session manager

src/lib/session.ts

@@ -0,0 +1,45 @@
+import { EventEmitter } from 'stream';
+/* todo implement history saving and better artifact typing and handling */
+class SessionManager {
+  private static sessions = new Map<string, SessionManager>();
+  readonly id: string;
+  private artifacts = new Map<string, Artifact>();
+  private emitter = new EventEmitter();
+
+  constructor() {
+    this.id = crypto.randomUUID();
+  }
+
+  static getSession(id: string): SessionManager | undefined {
+    return this.sessions.get(id);
+  }
+
+  static getAllSessions(): SessionManager[] {
+    return Array.from(this.sessions.values());
+  }
+
+  emit(event: string, data: any) {
+    this.emitter.emit(event, data);
+  }
+
+  emitArtifact(artifact: Artifact) {
+    this.artifacts.set(artifact.id, artifact);
+    this.emitter.emit('addArtifact', artifact);
+  }
+
+  appendToArtifact(artifactId: string, data: any) {
+    const artifact = this.artifacts.get(artifactId);
+    if (artifact) {
+      if (typeof artifact.data === 'string') {
+        artifact.data += data;
+      } else if (Array.isArray(artifact.data)) {
+        artifact.data.push(data);
+      } else if (typeof artifact.data === 'object') {
+        Object.assign(artifact.data, data);
+      }
+      this.emitter.emit('updateArtifact', artifact);
+    }
+  }
+}
+
+export default SessionManager;

src/lib/types.ts

@@ -7,3 +7,9 @@ type Chunk = {
   content: string;
   metadata: Record<string, any>;
 };
+
+type Artifact = {
+  id: string;
+  type: string;
+  data: any;
+};