Agent-Skills.md

Agent Skills: ArcGIS Starter App

Scaffold ArcGIS Maps SDK applications with TypeScript and Vite. Includes both a minimal quick-start setup and a production-ready configuration with ESLint, Prettier, git hooks, and GitHub Actions CI/CD.

UncategorizedID: SaschaBrunnerCH/arcgis-maps-sdk-js-ai-context/arcgis-starter-app

Repository

SaschaBrunnerCH/arcgis-maps-sdk-js-ai-context
SaschaBrunnerCHLicense: MIT
51

Install this agent skill to your local

pnpm dlx add-skill https://github.com/SaschaBrunnerCH/arcgis-maps-sdk-js-ai-context/tree/HEAD/contexts/5.0/skills/arcgis-starter-app

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contexts/5.0/skills/arcgis-starter-app/SKILL.md

Skill Metadata

Name
arcgis-starter-app
Description
Scaffold ArcGIS Maps SDK applications with TypeScript and Vite. Includes both a minimal quick-start setup and a production-ready configuration with ESLint, Prettier, git hooks, and GitHub Actions CI/CD.

ArcGIS Starter App

Use this skill to create ArcGIS Maps SDK for JavaScript applications with TypeScript and Vite. Choose between a minimal setup for quick prototyping or a production-ready configuration with full tooling.

Prerequisites

  • ArcGIS account: An ArcGIS Location Platform, ArcGIS Online, or ArcGIS Enterprise account is required to access content and services.
  • Access token: Create an access token through your portal with appropriate privileges (basemaps, geocoding, routing, etc.) and configure allowed referrers for production use.
  • Node.js: LTS version (20+) with npm or pnpm.

Note: CSS for Map Components loads automatically when using npm — no manual CSS import for @arcgis/map-components is needed. The @arcgis/core CSS import is only required when using Core API widgets directly.

Framework Integration

React 19

Map Components are web components (custom elements). In React 19, use them directly and attach event listeners with the on prefix:

import "@arcgis/map-components/dist/components/arcgis-map";
import "@arcgis/map-components/dist/components/arcgis-zoom";

function App() {
  return (
    <arcgis-map
      basemap="topo-vector"
      center="-118.24,34.05"
      zoom={12}
      onarcgisViewReadyChange={(e: CustomEvent) => {
        const { view } = e.detail;
        console.log("View ready:", view);
      }}
    >
      <arcgis-zoom slot="top-left"></arcgis-zoom>
    </arcgis-map>
  );
}

Important: Use event listeners (e.g., onarcgisViewReadyChange) rather than calling methods directly on the element ref, since the component may not be defined yet at render time.

Angular

Add CUSTOM_ELEMENTS_SCHEMA to your module or standalone component so Angular recognizes non-Angular elements:

import { CUSTOM_ELEMENTS_SCHEMA, Component } from "@angular/core";

@Component({
  selector: "app-map",
  standalone: true,
  schemas: [CUSTOM_ELEMENTS_SCHEMA],
  template: `
    <arcgis-map basemap="topo-vector" center="-118.24,34.05" [zoom]="12">
      <arcgis-zoom slot="top-left"></arcgis-zoom>
    </arcgis-map>
  `,
})
export class MapComponent {}

Import the Map Components CSS explicitly in your root stylesheet:

/* styles.css */
@import "@arcgis/map-components/dist/components/arcgis-map/arcgis-map.css";

TypeScript Configuration

Set moduleResolution to "node16" or "bundler" in tsconfig.json to properly resolve @arcgis/map-components package exports:

{
  "compilerOptions": {
    "moduleResolution": "bundler"
  }
}

Minimal Setup

Project Structure

my-arcgis-app/
├── src/
│   ├── main.ts
│   └── style.css
├── index.html
├── package.json
├── tsconfig.json
├── vite.config.ts
├── .gitignore
└── README.md

package.json

{
  "name": "my-arcgis-app",
  "private": true,
  "version": "0.0.1",
  "type": "module",
  "scripts": {
    "dev": "vite",
    "build": "tsc && vite build",
    "preview": "vite preview"
  },
  "devDependencies": {
    "typescript": "~5.9.3",
    "vite": "^7.2.7"
  },
  "dependencies": {
    "@arcgis/map-components": "^5.0.0",
    "@esri/calcite-components": "^3.3.3"
  }
}

index.html (2D Map)

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
    <title>ArcGIS Map App</title>
    <link rel="stylesheet" href="/src/style.css" />
  </head>
  <body>
    <calcite-shell content-behind>
      <arcgis-map item-id="YOUR_WEBMAP_ID">
        <arcgis-zoom slot="top-left"></arcgis-zoom>
        <arcgis-legend slot="bottom-left"></arcgis-legend>
      </arcgis-map>
    </calcite-shell>
    <script type="module" src="/src/main.ts"></script>
  </body>
</html>

index.html (3D Scene)

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
    <title>ArcGIS Scene App</title>
    <link rel="stylesheet" href="/src/style.css" />
  </head>
  <body>
    <calcite-shell content-behind>
      <arcgis-scene item-id="YOUR_WEBSCENE_ID">
        <arcgis-zoom slot="top-left"></arcgis-zoom>
        <arcgis-navigation-toggle slot="top-left"></arcgis-navigation-toggle>
        <arcgis-compass slot="top-left"></arcgis-compass>
      </arcgis-scene>
    </calcite-shell>
    <script type="module" src="/src/main.ts"></script>
  </body>
</html>

src/main.ts (Map Components)

import "@arcgis/map-components/dist/components/arcgis-map";
import "@arcgis/map-components/dist/components/arcgis-zoom";
import "@arcgis/map-components/dist/components/arcgis-legend";
// For 3D scenes, also import:
// import "@arcgis/map-components/dist/components/arcgis-scene";
// import "@arcgis/map-components/dist/components/arcgis-navigation-toggle";
// import "@arcgis/map-components/dist/components/arcgis-compass";

import "@esri/calcite-components/dist/components/calcite-shell";

import { setAssetPath as setCalciteAssetPath } from "@esri/calcite-components/dist/components";

// Set Calcite assets path
setCalciteAssetPath("https://js.arcgis.com/calcite-components/3.3.3/assets");

// Configure ArcGIS API key
import esriConfig from "@arcgis/core/config";
esriConfig.apiKey = "YOUR_API_KEY";

// Wait for map to be ready
const arcgisMap = document.querySelector("arcgis-map");
arcgisMap?.addEventListener("arcgisViewReadyChange", (event) => {
  const { view } = (event as CustomEvent).detail;
  console.log("Map view ready:", view);
});

src/main.ts (Core API - Programmatic)

import "@esri/calcite-components/dist/components/calcite-shell";
import { setAssetPath as setCalciteAssetPath } from "@esri/calcite-components/dist/components";

import Map from "@arcgis/core/Map.js";
import MapView from "@arcgis/core/views/MapView.js";

// Set Calcite assets path
setCalciteAssetPath("https://js.arcgis.com/calcite-components/3.3.3/assets");

const map = new Map({ basemap: "topo-vector" });

// Create view
const view = new MapView({
  container: "viewDiv",
  map: map,
  center: [-118.805, 34.027],
  zoom: 13,
});

src/style.css

@import "@arcgis/core/assets/esri/themes/light/main.css";

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  font-family: "Avenir Next", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

calcite-shell { width: 100%; height: 100%; }
arcgis-map, arcgis-scene, #viewDiv { width: 100%; height: 100%; }

tsconfig.json

{
  "compilerOptions": {
    "target": "ES2020",
    "useDefineForClassFields": true,
    "module": "ESNext",
    "lib": ["ES2020", "DOM", "DOM.Iterable"],
    "skipLibCheck": true,
    "moduleResolution": "bundler",
    "allowImportingTsExtensions": true,
    "isolatedModules": true,
    "moduleDetection": "force",
    "noEmit": true,
    "strict": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noFallthroughCasesInSwitch": true,
    "noUncheckedSideEffectImports": true
  },
  "include": ["src"]
}

vite.config.ts

import { defineConfig } from "vite";

export default defineConfig({
  build: { target: "esnext" }
});

.gitignore

node_modules/
dist/
.env
.env.local

Quick Start

npm install @arcgis/map-components @esri/calcite-components
npm install -D typescript vite
npm run dev

Common Widgets

// Import additional components as needed
import "@arcgis/map-components/dist/components/arcgis-search";
import "@arcgis/map-components/dist/components/arcgis-basemap-gallery";
import "@arcgis/map-components/dist/components/arcgis-layer-list";

<arcgis-map item-id="YOUR_MAP_ID">
  <arcgis-search slot="top-right"></arcgis-search>
  <arcgis-basemap-gallery slot="top-right"></arcgis-basemap-gallery>
</arcgis-map>

Production Setup

Project Structure

my-arcgis-app/
├── .github/
│   └── workflows/
│       ├── test.yml
│       └── deploy.yml
├── src/
│   ├── main.ts
│   └── style.css
├── index.html
├── package.json
├── tsconfig.json
├── vite.config.ts
├── eslint.config.js
├── .prettierrc
├── .prettierignore
├── .editorconfig
├── .gitattributes
├── .gitignore
├── .env.example
└── README.md

package.json

{
  "name": "my-arcgis-app",
  "version": "0.0.1",
  "type": "module",
  "scripts": {
    "dev": "vite",
    "build": "tsc && vite build",
    "preview": "vite preview",
    "lint": "eslint .",
    "format:check": "prettier --check .",
    "format": "prettier --write .",
    "prepare": "simple-git-hooks"
  },
  "devDependencies": {
    "@eslint/js": "^9.39.1",
    "eslint": "^9.39.1",
    "eslint-config-prettier": "^9.1.0",
    "eslint-plugin-import": "^2.29.1",
    "eslint-plugin-unicorn": "^55.0.0",
    "globals": "^16.5.0",
    "prettier": "^3.7.4",
    "lint-staged": "^16.2.7",
    "simple-git-hooks": "^2.13.1",
    "typescript": "~5.9.3",
    "typescript-eslint": "^8.49.0",
    "vite": "^7.2.7"
  },
  "dependencies": {
    "@arcgis/core": "5.0.0",
    "@arcgis/map-components": "^5.0.0",
    "@esri/calcite-components": "^3.3.3"
  },
  "simple-git-hooks": {
    "pre-commit": "pnpm exec lint-staged",
    "pre-push": "pnpm exec tsc --noEmit"
  },
  "lint-staged": {
    "*.{ts,tsx}": ["eslint --fix", "prettier --write"],
    "*.{js,json,css,md,yml,yaml}": ["prettier --write"]
  }
}

eslint.config.js

import eslint from "@eslint/js";
import configPrettier from "eslint-config-prettier";
import importPlugin from "eslint-plugin-import";
import unicornPlugin from "eslint-plugin-unicorn";
import globals from "globals";
import tseslint from "typescript-eslint";

export default tseslint.config(
  eslint.configs.recommended,
  ...tseslint.configs.recommended,
  // Enable type-aware linting for TypeScript files
  {
    files: ["**/*.ts", "**/*.tsx"],
    languageOptions: {
      ecmaVersion: "latest",
      sourceType: "module",
      parserOptions: {
        projectService: true,
        allowDefaultProject: ["vite.config.ts"],
      },
    },
  },
  // Scope type-checked recommendations strictly to TS files
  ...tseslint.configs.recommendedTypeChecked.map((cfg) => ({
    ...cfg,
    files: ["**/*.ts", "**/*.tsx", "**/*.mts", "**/*.cts"],
  })),
  {
    languageOptions: {
      ecmaVersion: "latest",
      sourceType: "module",
      globals: {
        ...globals.browser,
      },
    },
  },
  {
    ignores: ["dist/**", "node_modules/**"],
  },
  {
    ignores: ["vite.config.ts"],
  },
  {
    plugins: {
      import: importPlugin,
      unicorn: unicornPlugin,
    },
    rules: {
      // import hygiene
      "import/no-duplicates": "error",
      "import/no-useless-path-segments": "error",
      "import/no-extraneous-dependencies": [
        "error",
        {
          devDependencies: [
            "**/eslint.config.*",
            "**/vite.config.*",
            "**/*.config.*",
            "**/scripts/**",
            "**/*.test.*",
            "**/*.spec.*",
            ".github/**",
          ],
          optionalDependencies: false,
          peerDependencies: true,
        },
      ],
      "import/order": [
        "warn",
        {
          groups: [
            "builtin",
            "external",
            "internal",
            "parent",
            "sibling",
            "index",
            "object",
            "type",
          ],
          "newlines-between": "always",
          alphabetize: { order: "asc", caseInsensitive: true },
        },
      ],

      // unused vars/imports
      "no-unused-vars": "off",
      "@typescript-eslint/no-unused-vars": [
        "warn",
        {
          argsIgnorePattern: "^_",
          varsIgnorePattern: "^_",
          caughtErrorsIgnorePattern: "^_",
        },
      ],

      // code quality
      eqeqeq: ["error", "always"],
      "no-console": ["warn", { allow: ["warn", "error"] }],
      "@typescript-eslint/no-explicit-any": "warn",

      // unicorn essentials
      "unicorn/prefer-node-protocol": "error",
      "unicorn/prefer-string-starts-ends-with": "error",
      "unicorn/prefer-array-find": "error",
      "unicorn/throw-new-error": "error",

      // typescript consistency
      "@typescript-eslint/consistent-type-imports": "warn",
      "@typescript-eslint/explicit-function-return-type": "off",
      "@typescript-eslint/no-require-imports": "error",
    },
  },
  // Node environment for config and build scripts
  {
    files: ["eslint.config.js", "vite.config.*", "*.config.*", "scripts/**"],
    languageOptions: {
      globals: {
        ...globals.node,
      },
    },
  },
  // Declarations: relax strictness for ambient types
  {
    files: ["**/*.d.ts"],
    rules: {
      "@typescript-eslint/no-redundant-type-constituents": "off",
      "@typescript-eslint/no-unsafe-member-access": "off",
    },
  },
  // TS-only: enable balanced type-aware rules
  {
    files: ["**/*.ts", "**/*.tsx", "**/*.mts", "**/*.cts"],
    rules: {
      "@typescript-eslint/no-floating-promises": "error",
      "@typescript-eslint/no-misused-promises": [
        "error",
        { checksVoidReturn: false },
      ],
      "@typescript-eslint/await-thenable": "warn",

      "@typescript-eslint/no-unsafe-assignment": "off",
      "@typescript-eslint/no-unsafe-call": "off",
      "@typescript-eslint/no-unsafe-member-access": "off",
      "@typescript-eslint/no-unsafe-return": "off",
      "@typescript-eslint/no-unsafe-argument": "off",

      "@typescript-eslint/require-await": "off",
      "@typescript-eslint/no-unnecessary-type-assertion": "warn",
      "@typescript-eslint/no-redundant-type-constituents": "off",
    },
  },
  // Disable ESLint rules that would conflict with Prettier formatting
  configPrettier
);

.prettierrc

{
  "arrowParens": "always",
  "bracketSameLine": false,
  "bracketSpacing": true,
  "endOfLine": "lf",
  "jsxSingleQuote": false,
  "printWidth": 120,
  "quoteProps": "consistent",
  "semi": true,
  "singleQuote": true,
  "tabWidth": 2,
  "trailingComma": "all",
  "useTabs": false,
  "proseWrap": "preserve",
  "htmlWhitespaceSensitivity": "css"
}

.prettierignore

dist/
node_modules/
*.min.js
package-lock.json
pnpm-lock.yaml

.editorconfig

root = true

[*]
charset = utf-8
end_of_line = lf
insert_final_newline = true
indent_style = space
indent_size = 2
trim_trailing_whitespace = true

[*.md]
trim_trailing_whitespace = false

.gitattributes

* text=auto eol=lf

.gitignore

node_modules/
dist/
.env
.env.local
.env.*.local
*.log
.DS_Store
*.tsbuildinfo

.env.example

# ArcGIS API Key
# Get your API key from https://developers.arcgis.com/
VITE_ARCGIS_API_KEY=your_arcgis_api_key_here

.github/workflows/test.yml

name: Test

on:
  pull_request:
    branches:
      - main

permissions:
  contents: read
  issues: write

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Setup pnpm
        uses: pnpm/action-setup@v4
        with:
          version: 10

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: "24"
          cache: "pnpm"

      - name: Install dependencies
        run: pnpm install --frozen-lockfile

      - name: Security audit
        run: pnpm audit --audit-level=high

      - name: ESLint
        run: pnpm run lint

      - name: Prettier check
        run: pnpm run format:check

      - name: Annotate formatting issues
        if: failure()
        uses: actions/github-script@v7
        with:
          script: |
            const runUrl = `${context.serverUrl}/${context.repo.owner}/${context.repo.repo}/actions/runs/${context.runId}`;
            const body = [
              'Prettier check failed. Please run `pnpm run format` locally to fix formatting.',
              '',
              `Workflow run: ${runUrl}`,
            ].join('\n');
            if (context.payload.pull_request) {
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.payload.pull_request.number,
                body,
              });
            } else {
              core.summary.addHeading('Prettier check failed');
              core.summary.addRaw(body);
              await core.summary.write();
            }

      - name: Type check
        run: pnpm exec tsc --noEmit

      - name: Build
        run: pnpm run build
        env:
          NODE_OPTIONS: "--max-old-space-size=4096"
          VITE_ARCGIS_API_KEY: ${{ secrets.VITE_ARCGIS_API_KEY }}

.github/workflows/deploy.yml

name: Build & Deploy to GitHub Pages

on:
  push:
    branches:
      - main
  workflow_dispatch:

permissions:
  contents: read
  pages: write
  id-token: write

concurrency:
  group: pages
  cancel-in-progress: false

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Setup pnpm
        uses: pnpm/action-setup@v4
        with:
          version: 10

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: "24"
          cache: "pnpm"

      - name: Install dependencies
        run: pnpm install --frozen-lockfile

      - name: Build
        run: pnpm run build
        env:
          NODE_OPTIONS: "--max-old-space-size=4096"
          VITE_ARCGIS_API_KEY: ${{ secrets.VITE_ARCGIS_API_KEY }}

      - name: Setup Pages
        uses: actions/configure-pages@v4

      - name: Upload artifact
        uses: actions/upload-pages-artifact@v3
        with:
          path: "./dist"

  deploy:
    environment:
      name: github-pages
      url: ${{ steps.deployment.outputs.page_url }}
    runs-on: ubuntu-latest
    needs: build
    steps:
      - name: Deploy to GitHub Pages
        id: deployment
        uses: actions/deploy-pages@v4

Production src/main.ts

import "@arcgis/map-components/dist/components/arcgis-scene";
import "@arcgis/map-components/dist/components/arcgis-zoom";
import "@arcgis/map-components/dist/components/arcgis-navigation-toggle";
import "@arcgis/map-components/dist/components/arcgis-compass";

import { setAssetPath as setCalciteAssetPath } from "@esri/calcite-components/dist/components";

import esriConfig from "@arcgis/core/config";

// Set Calcite assets path
setCalciteAssetPath("https://js.arcgis.com/calcite-components/3.3.3/assets");

// Configure ArcGIS API key from environment variable
esriConfig.apiKey = import.meta.env.VITE_ARCGIS_API_KEY as string;

// Wait for map to be ready
const arcgisScene = document.querySelector("arcgis-scene");
arcgisScene?.addEventListener("arcgisViewReadyChange", (event) => {
  const { view } = (event as CustomEvent).detail;
  console.warn("Scene view ready:", view);
});

Quick Start (Production)

pnpm create vite my-arcgis-app --template vanilla-ts
cd my-arcgis-app
pnpm add @arcgis/map-components @arcgis/core @esri/calcite-components
pnpm add -D eslint @eslint/js typescript-eslint eslint-config-prettier eslint-plugin-import eslint-plugin-unicorn globals prettier simple-git-hooks lint-staged
pnpm run prepare
pnpm dev

Related Skills

  • See arcgis-core-maps for map and view configuration.
  • See arcgis-layers for adding data layers to the map.
  • See arcgis-widgets-ui for adding widgets and UI components.

Reference Samples

  • intro-mapview - Step-by-step guide to creating a basic 2D map
  • intro-map-components - Getting started with web components
  • intro-sceneview - Create a 3D scene for your app
  • intro-graphics - Add graphics and drawing to maps
  • intro-popup - Add popups to display feature information

Common Pitfalls

  1. API key not configured: The app references an environment variable that does not exist or is empty.

    // Anti-pattern: referencing env var without creating .env file
import esriConfig from "@arcgis/core/config";
esriConfig.apiKey = import.meta.env.VITE_ARCGIS_API_KEY as string;
// .env file is missing or VITE_ARCGIS_API_KEY is empty

    // Correct: create .env file with a valid API key
// .env
// VITE_ARCGIS_API_KEY=AAPTxy...your_actual_key_here

import esriConfig from "@arcgis/core/config";
esriConfig.apiKey = import.meta.env.VITE_ARCGIS_API_KEY as string;

    Impact: Without a valid API key, basemap tiles and location services (geocoding, routing) fail to load. The map renders as a grey or blank canvas with no visible error in the UI.

  2. Wrong moduleResolution in tsconfig: Using "node" instead of "node16" or "bundler" prevents TypeScript from resolving package exports.

    // Anti-pattern: moduleResolution "node" cannot resolve package exports
{
  "compilerOptions": {
    "moduleResolution": "node"
  }
}

    // Correct: use "node16" or "bundler" for package exports support
{
  "compilerOptions": {
    "moduleResolution": "bundler"
  }
}

    Impact: TypeScript cannot resolve @arcgis/map-components subpath exports (e.g., @arcgis/map-components/dist/components/arcgis-map). The build fails with "Cannot find module" errors at compile time.

  3. Calcite assets not configured: Calcite icons and components require the asset path to be set at runtime.

    // Anti-pattern: importing Calcite components without setting asset path
import "@esri/calcite-components/dist/components/calcite-shell";
// No setAssetPath call - icons and internal assets fail to load

    // Correct: set the Calcite asset path before using components
import "@esri/calcite-components/dist/components/calcite-shell";
import { setAssetPath as setCalciteAssetPath } from "@esri/calcite-components/dist/components";

setCalciteAssetPath("https://js.arcgis.com/calcite-components/3.3.3/assets");

    Impact: Calcite icons render as empty boxes, action buttons show no icons, and some components (like calcite-shell) may not lay out correctly because their internal assets cannot be fetched.