arkts-skills/arkts-development/SKILL.md

name, description

name

description

arkts-development

HarmonyOS ArkTS application development with ArkUI declarative UI framework. Use when building HarmonyOS/OpenHarmony apps, creating ArkUI components, implementing state management with decorators (@State, @Prop, @Link), migrating from TypeScript to ArkTS, or working with HarmonyOS-specific APIs (router, http, preferences). Covers component lifecycle, layout patterns, and ArkTS language constraints.

ArkTS Development

Build HarmonyOS applications using ArkTS and the ArkUI declarative UI framework.

Quick Start

Create a basic component:

@Entry
@Component
struct HelloWorld {
  @State message: string = 'Hello, ArkTS!';

  build() {
    Column() {
      Text(this.message)
        .fontSize(30)
        .fontWeight(FontWeight.Bold)
      Button('Click Me')
        .onClick(() => { this.message = 'Button Clicked!'; })
    }
    .width('100%')
    .height('100%')
    .justifyContent(FlexAlign.Center)
  }
}

State Management Decorators

Decorator	Usage	Description
@State	@State count: number = 0	Component internal state
@Prop	@Prop title: string	Parent → Child (one-way)
@Link	@Link value: number	Parent ↔ Child (two-way, use $varName)
@Provide/@Consume	Cross-level	Ancestor → Descendant
@Observed/@ObjectLink	Nested objects	Deep object observation

Common Layouts

// Vertical
Column({ space: 10 }) { Text('A'); Text('B'); }
  .alignItems(HorizontalAlign.Center)

// Horizontal
Row({ space: 10 }) { Text('A'); Text('B'); }
  .justifyContent(FlexAlign.SpaceBetween)

// Stack (overlay)
Stack({ alignContent: Alignment.Center }) {
  Image($r('app.media.bg'))
  Text('Overlay')
}

// List with ForEach
List({ space: 10 }) {
  ForEach(this.items, (item: string) => {
    ListItem() { Text(item) }
  }, (item: string) => item)
}

Component Lifecycle

@Entry
@Component
struct Page {
  aboutToAppear() { /* Init data */ }
  onPageShow() { /* Page visible */ }
  onPageHide() { /* Page hidden */ }
  aboutToDisappear() { /* Cleanup */ }
  build() { Column() { Text('Page') } }
}

Navigation

import { router } from '@kit.ArkUI';

// Push
router.pushUrl({ url: 'pages/Detail', params: { id: 123 } });

// Replace
router.replaceUrl({ url: 'pages/New' });

// Back
router.back();

// Get params
const params = router.getParams() as Record<string, Object>;

Network Request

import { http } from '@kit.NetworkKit';

const req = http.createHttp();
const res = await req.request('https://api.example.com/data', {
  method: http.RequestMethod.GET,
  header: { 'Content-Type': 'application/json' }
});
if (res.responseCode === 200) {
  const data = JSON.parse(res.result as string);
}
req.destroy();

Local Storage

import { preferences } from '@kit.ArkData';

const prefs = await preferences.getPreferences(this.context, 'store');
await prefs.put('key', 'value');
await prefs.flush();
const val = await prefs.get('key', 'default');

ArkTS Language Constraints

ArkTS enforces stricter rules than TypeScript for performance and safety:

Prohibited	Use Instead
any, unknown	Explicit types, interfaces
var	let, const
Dynamic property access obj['key']	Fixed object structure
for...in, delete, with	for...of, array methods
#privateField	private keyword
Structural typing	Explicit implements/extends

See references/migration-guide.md for complete TypeScript → ArkTS migration details.

Reference Files

• Migration Guide: references/migration-guide.md - Complete TypeScript to ArkTS migration rules and examples
• Component Patterns: references/component-patterns.md - Advanced component patterns and best practices
• API Reference: references/api-reference.md - Common HarmonyOS APIs

Development Environment

• IDE: DevEco Studio
• SDK: HarmonyOS SDK
• Simulator: Built-in DevEco Studio emulator