arkts-error-fixes

# Harmony 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 | ## 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](./reference/notification_errors.md) - [Code Example](./assets/NotificationError.ets) ### Window API Type Errors - [Window Type Inference Error](./reference/window_type_errors.md) - [Code Example](./assets/WindowTypeError.ets) ### AppStorage Type Errors - [AppStorage Type Error](./reference/appstorage_errors.md) - [Code Example](./assets/AppStorageError.ets) ### Object Spread Type Errors - [Object Spread Type Error](./reference/object_spread_errors.md) - [Code Example](./assets/ObjectSpreadError.ets) ### @StorageLink Default Value Errors - [@StorageLink Default Value Error](./reference/storage_link_default_errors.md) - [Code Example](./assets/StorageLinkDefaultError.ets) ### Object Literal Interface Errors - [Object Literal Interface Error](./reference/object_literal_interface_errors.md) - [Code Example](./assets/ObjectLiteralInterfaceError.ets) ### Object Literal Type Errors - [Object Literal Type Error](./reference/object_literal_type_errors.md) - [Code Example](./assets/ObjectLiteralTypeError.ets) ### Function Return Type Errors - [Function Return Type Error](./reference/function_return_type_errors.md) - [Code Example](./assets/FunctionReturnTypeError.ets) ### Arrow Function Conversion Errors - [Arrow Function Conversion Error](./reference/arrow_function_conversion_errors.md) - [Code Example](./assets/ArrowFunctionConversionError.ets) ### Color Property Errors - [Color Property Error](./reference/color_property_errors.md) - [Code Example](./assets/ColorPropertyError.ets) ### Interface Method Signature Errors - [Interface Method Signature Error](./reference/interface_method_signature_errors.md) - [Code Example](./assets/InterfaceMethodSignatureError.ets) ### AvoidArea Type Errors - [AvoidArea Type Error](./reference/avoid_area_type_errors.md) - [Code Example](./assets/AvoidAreaTypeError.ets) ### Standalone Function `this` Errors - [Standalone Function `this` Error](./reference/standalone_function_errors.md) - [Code Example](./assets/StandaloneFunctionError.ets) ### TitleButtonRect Type Errors - [TitleButtonRect Type Error](./reference/title_button_rect_type_errors.md) - [Code Example](./assets/TitleButtonRectTypeError.ets) ### Catch Clause Type Errors - [Catch Clause Type Error](./reference/catch_clause_type_errors.md) - [Code Example](./assets/CatchClauseTypeError.ets) ### ESObject Type Errors - [ESObject Type Error](./reference/esobject_type_errors.md) - [Code Example](./assets/ESObjectTypeError.ets) ### Resource Conversion Errors - [Resource Conversion Error](./reference/resource_conversion_errors.md) - [Code Example](./assets/ResourceConversionError.ets) ### Unused Variable Warnings - [Unused Variable Warning](./reference/unused_variable_warnings.md) - [Code Example](./assets/UnusedVariableWarning.ets) ### IDataSource Type Errors - [IDataSource Type Error](./reference/idata_source_errors.md) - [Code Example](./assets/IDataSourceError.ets) ### Duplicate Entry Errors - [Duplicate Entry Error](./reference/duplicate_entry_errors.md) - [Code Example](./assets/DuplicateEntryError.ets) ### Possibly Null Errors - [Possibly Null Error](./reference/possibly_null_errors.md) - [Code Example](./assets/PossiblyNullError.ets) ### Window Rect/Size Type Errors - [Window Rect/Size Type Error](./reference/window_rect_size_errors.md) - [Code Example](./assets/WindowRectSizeError.ets)