Utilizing Partial Types in TypeScript Getter and Setter Functions

Question

Utilizing Partial Types in TypeScript Getter and Setter Functions

Within the Angular framework, I have implemented a component input that allows for setting options, specifically of type IOptions. The setter function does not require complete options as it will be merged with default options. Therefore, it is typed as Partial<IOptions>.

const DEFAULT_OPTIONS = { prop1: false, prop2: 123 };

export class MyComponent {
  _options: IOptions;

  get options(): IOptions {
    return this._options;
  }

  @Input('config')
  set options(userOptions: Partial<IOptions>) {
    this._options = { ...DEFAULT_OPTIONS, ...userOptions };
  }
}

However, the getter is expected to always return a complete object of type IOptions, leading to a compiler error regarding the mismatch between getter and setter types. How can this issue be resolved?

angular typescript getter-setter

Answer 1

Answer №1

In Typescript, it is not possible to have getters and setters of different types. One workaround is to change all properties to Partial<IOptions>. Alternatively,

You can create a class for your options with optional properties and default values as shown below:

export class MyComponentOption {
   prop1?: boolean = false;
   prop2?: number = 123;

   constructor(params: MyComponentOption ) {
     Object.assign(this, params)
   }
}

Then, you can use this class in your component like this:

export class MyComponent {
  @Input('config') options : MyComponentOption;
}

Finally, initialize the options with specific parameters like this:

config:MyComponentOption = new MyComponentOption({prop1:true});

Answer 2

In Typescript, it is not possible to have getters and setters of different types. One workaround is to change all properties to Partial<IOptions>. Alternatively,

You can create a class for your options with optional properties and default values as shown below:

export class MyComponentOption {
   prop1?: boolean = false;
   prop2?: number = 123;

   constructor(params: MyComponentOption ) {
     Object.assign(this, params)
   }
}

Then, you can use this class in your component like this:

export class MyComponent {
  @Input('config') options : MyComponentOption;
}

Finally, initialize the options with specific parameters like this:

config:MyComponentOption = new MyComponentOption({prop1:true});

Utilizing Partial Types in TypeScript Getter and Setter Functions

Answer №1

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