feat(sdk): add vue, svelte, angular implementation of useStream hook

examples/ui-angular/.gitignore

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+# See https://docs.github.com/get-started/getting-started-with-git/ignoring-files for more about ignoring files.
+
+# Compiled output
+/dist
+/tmp
+/out-tsc
+/bazel-out
+
+# Node
+/node_modules
+npm-debug.log
+yarn-error.log
+
+# IDEs and editors
+.idea/
+.project
+.classpath
+.c9/
+*.launch
+.settings/
+*.sublime-workspace
+
+# Visual Studio Code
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+.history/*
+
+# Miscellaneous
+/.angular/cache
+.sass-cache/
+/connect.lock
+/coverage
+/libpeerconnection.log
+testem.log
+/typings
+__screenshots__/
+
+# System files
+.DS_Store
+Thumbs.db
+
+# LangGraph API
+.langgraph_api

examples/ui-angular/angular.json

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+{
+  "$schema": "../../node_modules/@angular/cli/lib/config/schema.json",
+  "version": 1,
+  "newProjectRoot": "projects",
+  "projects": {
+    "example-angular": {
+      "projectType": "application",
+      "schematics": {},
+      "root": "",
+      "sourceRoot": "src",
+      "prefix": "app",
+      "architect": {
+        "build": {
+          "builder": "@angular/build:application",
+          "options": {
+            "browser": "src/main.ts",
+            "polyfills": [
+              "zone.js"
+            ],
+            "tsConfig": "tsconfig.app.json",
+            "assets": [
+              {
+                "glob": "**/*",
+                "input": "public"
+              }
+            ],
+            "styles": [
+              "src/styles.css"
+            ]
+          },
+          "configurations": {
+            "production": {
+              "budgets": [
+                {
+                  "type": "initial",
+                  "maximumWarning": "500kB",
+                  "maximumError": "1MB"
+                },
+                {
+                  "type": "anyComponentStyle",
+                  "maximumWarning": "4kB",
+                  "maximumError": "8kB"
+                }
+              ],
+              "outputHashing": "all"
+            },
+            "development": {
+              "optimization": false,
+              "extractLicenses": false,
+              "sourceMap": true
+            }
+          },
+          "defaultConfiguration": "production"
+        },
+        "serve": {
+          "builder": "@angular/build:dev-server",
+          "configurations": {
+            "production": {
+              "buildTarget": "example-angular:build:production"
+            },
+            "development": {
+              "buildTarget": "example-angular:build:development"
+            }
+          },
+          "defaultConfiguration": "development"
+        },
+        "extract-i18n": {
+          "builder": "@angular/build:extract-i18n"
+        },
+        "test": {
+          "builder": "@angular/build:karma",
+          "options": {
+            "polyfills": [
+              "zone.js",
+              "zone.js/testing"
+            ],
+            "tsConfig": "tsconfig.spec.json",
+            "assets": [
+              {
+                "glob": "**/*",
+                "input": "public"
+              }
+            ],
+            "styles": [
+              "src/styles.css"
+            ]
+          }
+        }
+      }
+    }
+  },
+  "cli": {
+    "cache": {
+      "enabled": false
+    }
+  }
+}

examples/ui-angular/langgraph.json

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+{
+  "node_version": "22",
+  "graphs": {
+    "agent": "./src/agent.mts:graph"
+  },
+  "env": ".env"
+}

examples/ui-angular/package.json

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+{
+  "name": "@examples/ui-angular",
+  "version": "0.0.0",
+  "scripts": {
+    "dev": "turbo dev:client dev:server",
+    "dev:client": "ng serve",
+    "dev:server": "langgraphjs dev --no-browser",
+    "ng": "ng",
+    "start": "ng serve",
+    "build": "ng build",
+    "watch": "ng build --watch --configuration development",
+    "format": "prettier --write src",
+    "lint": "prettier --check src"
+  },
+  "prettier": {
+    "printWidth": 100,
+    "singleQuote": true,
+    "overrides": [
+      {
+        "files": "*.html",
+        "options": {
+          "parser": "angular"
+        }
+      }
+    ]
+  },
+  "private": true,
+  "dependencies": {
+    "@angular/common": "^20.3.0",
+    "@angular/compiler": "^20.3.0",
+    "@angular/core": "^20.3.0",
+    "@angular/forms": "^20.3.0",
+    "@angular/platform-browser": "^20.3.0",
+    "@angular/router": "^20.3.0",
+    "@langchain/angular": "workspace:*",
+    "@langchain/core": "^1.0.1",
+    "@langchain/langgraph": "workspace:*",
+    "@langchain/langgraph-sdk": "workspace:*",
+    "@langchain/openai": "^1.0.0",
+    "rxjs": "~7.8.0",
+    "tslib": "^2.3.0",
+    "zod": "^3.23.8",
+    "zone.js": "~0.15.0"
+  },
+  "devDependencies": {
+    "@angular/build": "^20.3.9",
+    "@angular/cli": "^20.3.9",
+    "@angular/compiler-cli": "^20.3.0",
+    "typescript": "~5.9.2"
+  }
+}

examples/ui-angular/src/agent.mts

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+import type { BaseMessage } from "@langchain/core/messages";
+import { StateGraph, MessagesZodMeta, START } from "@langchain/langgraph";
+import { registry } from "@langchain/langgraph/zod";
+import { ChatOpenAI } from "@langchain/openai";
+import { z } from "zod/v4";
+
+const llm = new ChatOpenAI({ model: "gpt-4o-mini" });
+
+const schema = z.object({
+  messages: z.custom<BaseMessage[]>().register(registry, MessagesZodMeta),
+});
+
+export const graph = new StateGraph(schema)
+  .addNode("agent", async ({ messages }) => ({
+    messages: await llm.invoke(messages),
+  }))
+  .addEdge(START, "agent")
+  .compile();

examples/ui-angular/src/app.ts

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+import { Component, signal } from '@angular/core';
+import { useStream } from '@langchain/angular';
+import { FormsModule } from '@angular/forms';
+import type { Message } from '@langchain/langgraph-sdk';
+
+@Component({
+  selector: 'app-root',
+  imports: [FormsModule],
+  template: `
+    <main class="main">
+      <div>
+        @for (message of stream.messages(); track message.id) {
+        <div>{{ message.content }}</div>
+        }
+      </div>
+
+      <form (ngSubmit)="onSubmit()">
+        <input type="text" [(ngModel)]="message" name="message" />
+        <button type="submit">Submit</button>
+      </form>
+    </main>
+  `,
+})
+export class App {
+  protected message = signal('');
+
+  protected stream = useStream({
+    assistantId: 'agent',
+    apiUrl: 'http://localhost:2024',
+  });
+
+  protected onSubmit() {
+    const newMessage = { content: this.message(), type: 'human' };
+    this.stream.submit(
+      { messages: [newMessage] },
+      {
+        optimisticValues: (prev) => ({
+          ...prev,
+          messages: [...((prev['messages'] ?? []) as Message[]), newMessage],
+        }),
+      }
+    );
+
+    // reset form
+    this.message.set('');
+  }
+}

examples/ui-angular/src/index.html

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+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <title>ExampleAngular</title>
+  <base href="/">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="icon" type="image/x-icon" href="favicon.ico">
+</head>
+<body>
+  <app-root></app-root>
+</body>
+</html>

examples/ui-angular/src/main.ts

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+import { bootstrapApplication } from '@angular/platform-browser';
+import { provideBrowserGlobalErrorListeners, provideZoneChangeDetection } from '@angular/core';
+import { App } from './app';
+
+bootstrapApplication(App, {
+  providers: [
+    provideBrowserGlobalErrorListeners(),
+    provideZoneChangeDetection({ eventCoalescing: true }),
+  ],
+}).catch((err) => console.error(err));

examples/ui-angular/src/styles.css

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+/* You can add global styles to this file, and also import other style files */

examples/ui-angular/tsconfig.app.json

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+/* To learn more about Typescript configuration file: https://www.typescriptlang.org/docs/handbook/tsconfig-json.html. */
+/* To learn more about Angular compiler options: https://angular.dev/reference/configs/angular-compiler-options. */
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "./out-tsc/app",
+    "types": []
+  },
+  "include": [
+    "src/**/*.ts"
+  ],
+  "exclude": [
+    "src/**/*.spec.ts"
+  ]
+}

examples/ui-angular/tsconfig.json

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+/* To learn more about Typescript configuration file: https://www.typescriptlang.org/docs/handbook/tsconfig-json.html. */
+/* To learn more about Angular compiler options: https://angular.dev/reference/configs/angular-compiler-options. */
+{
+  "compileOnSave": false,
+  "compilerOptions": {
+    "strict": true,
+    "noImplicitOverride": true,
+    "noPropertyAccessFromIndexSignature": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true,
+    "skipLibCheck": true,
+    "isolatedModules": true,
+    "experimentalDecorators": true,
+    "importHelpers": true,
+    "target": "ES2022",
+    "module": "preserve"
+  },
+  "angularCompilerOptions": {
+    "enableI18nLegacyMessageIdFormat": false,
+    "strictInjectionParameters": true,
+    "strictInputAccessModifiers": true,
+    "typeCheckHostBindings": true,
+    "strictTemplates": true
+  },
+  "files": [],
+  "references": [
+    {
+      "path": "./tsconfig.app.json"
+    },
+    {
+      "path": "./tsconfig.spec.json"
+    }
+  ]
+}

examples/ui-angular/tsconfig.spec.json

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+/* To learn more about Typescript configuration file: https://www.typescriptlang.org/docs/handbook/tsconfig-json.html. */
+/* To learn more about Angular compiler options: https://angular.dev/reference/configs/angular-compiler-options. */
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "./out-tsc/spec",
+    "types": [
+      "jasmine"
+    ]
+  },
+  "include": [
+    "src/**/*.ts"
+  ]
+}

examples/ui-angular/turbo.json

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+{
+  "extends": [
+    "//"
+  ],
+  "tasks": {
+    "build": {
+      "outputs": [
+        "**/dist/**"
+      ]
+    },
+    "build:internal": {
+      "dependsOn": [
+        "^build:internal"
+      ],
+      "outputs": [
+        "**/dist/**"
+      ]
+    },
+    "dev:client": {
+      "cache": false,
+      "persistent": true
+    },
+    "dev:server": {
+      "cache": false,
+      "persistent": true
+    }
+  }
+}

examples/ui-svelte/.gitignore

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+
+# LangGraph API
+.langgraph_api