open-deveco/arkts_error_fixes

ArkTS Error Fixes

This skill provides solutions for common ArkTS compilation errors and type mismatches encountered during HarmonyOS development.

Error Categories

| Category | Description | |-----------|-------------| | Notification API Type Errors | ContentType type incompatibility | | Window API Type Errors | Type inference issues with window.getLastWindow | | AppStorage Type Errors | Type inference errors with AppStorage.get() | | Object Spread Type Errors | Type inference issues with object spread | | @StorageLink Default Value Errors | Missing default values for @StorageLink properties | | Object Literal Interface Errors | Object literals without explicit interfaces | | Object Literal Type Errors | Using object literal types in return type annotations | | Function Return Type Errors | Limited return type inference | | Arrow Function Conversion Errors | Using function expressions instead of arrow functions | | Color Property Errors | Non-existent Color properties | | Interface Method Signature Errors | Method signature mismatches in object literals | | AvoidArea Type Errors | Missing visible property in AvoidArea type | | Standalone Function this Errors | Using this in standalone functions | | TitleButtonRect Type Errors | Incorrect return type for getTitleButtonRect; accessing non-existent properties (left, top) | | Catch Clause Type Errors | Type annotations in catch clauses | | ESObject Type Errors | Restricted usage of ESObject type | | Resource Conversion Errors | Resource to string/number conversion errors | | Unused Variable Warnings | Declared but never used variables | | IDataSource Type Errors | LazyForEach requires IDataSource implementation | | Duplicate Entry Errors | Multiple @Entry decorators in same file | | Possibly Null Errors | Object possibly null when accessing properties | | Cannot Find Module & Override Modifier Conflict | Module import failure and override modifier conflict|

Quick Reference

| Error Type | Solution | |------------|-----------| | Notification type error | Cast to number type | | Window type error | Use callback pattern for getLastWindow | | AppStorage type error | Use @StorageLink with LocalStorage or AppStorage.setAndLink (avoid setOrCreate) | | Object spread error | Explicitly type objects | | @StorageLink default value error | Add = undefined or specific default value | | Object literal interface error | Define interface before using object literal | | Object literal type error | Define interface and use it as return type | | Function return type error | Add explicit return type annotation | | Arrow function conversion error | Convert function to arrow function => | | Color property error | Use hex color values instead of non-existent Color properties | | Interface method signature error | Use property syntax method: () => {} instead of method syntax | | AvoidArea type error | Add visible: false property to AvoidArea object | | Standalone function this error | Pass context as parameter: function foo(context: Context) | | TitleButtonRect type error | Use window.TitleButtonRect instead of window.Rect; only width and height properties available | | Catch clause type error | Remove type annotation or use any/unknown | | ESObject type error | Use ESModule or specific types instead of ESObject | | Resource conversion error | Use Resource directly in UI components or use ResourceManager | | Unused variable warning | Use console.info/hilog or delete unused variable | | IDataSource type error | Implement IDataSource interface for LazyForEach | | Duplicate Entry error | Remove extra @Entry, use @Component for child components | | Possibly Null error | Use !== null check or optional chaining |

Detailed Error Solutions

Notification API Type Errors

• Notification Type Error
• Code Example

Window API Type Errors

• Window Type Inference Error
• Code Example

AppStorage Type Errors

• AppStorage Type Error
• Code Example

Object Spread Type Errors

• Object Spread Type Error
• Code Example

@StorageLink Default Value Errors

• @StorageLink Default Value Error
• Code Example

Object Literal Interface Errors

• Object Literal Interface Error
• Code Example

Object Literal Type Errors

• Object Literal Type Error
• Code Example

Function Return Type Errors

• Function Return Type Error
• Code Example

Arrow Function Conversion Errors

• Arrow Function Conversion Error
• Code Example

Color Property Errors

• Color Property Error
• Code Example

Interface Method Signature Errors

• Interface Method Signature Error
• Code Example

AvoidArea Type Errors

• AvoidArea Type Error
• Code Example

Standalone Function this Errors

• Standalone Function this Error
• Code Example

TitleButtonRect Type Errors

• TitleButtonRect Type Error
• Code Example

Catch Clause Type Errors

• Catch Clause Type Error
• Code Example

ESObject Type Errors

• ESObject Type Error
• Code Example

Resource Conversion Errors

• Resource Conversion Error
• Code Example

Unused Variable Warnings

• Unused Variable Warning
• Code Example

IDataSource Type Errors

• IDataSource Type Error
• Code Example

Duplicate Entry Errors

• Duplicate Entry Error
• Code Example

Possibly Null Errors

• Possibly Null Error
• Code Example

Window Rect/Size Type Errors

• Window Rect/Size Type Error
• Code Example

Cannot Find Module & Override Modifier Conflict

• Cannot Find Module & Override Modifier Conflict

Related Resources

• Deprecated API Solutions
• UI Context Migration Guide
• System Capabilities Migration Guide