Deciphering the TypeScript type in question - tips and tricks

One of my abstract classes includes a static property with various properties, where default is consistently named while the others may have random names.

  public static data = {
    default: { //only this one always have 'dafault' name
      name: 'someName',
      category: ['cat 1','cat2','catN'],
      urls: ['url1', 'url2']
    },
    property1: { //can have any random name 'property3' 'xyz'
      name: 'property1',
      category: ['cat 3','cat4','cat1'],
      urls: ['url3', 'url5']
    },
    anotherThing: { //can have any random name 'oneMoreThing' 'abc'
      name: 'anotherThing',
      category: ['cat 2','catN','cat5'],
      urls: ['url5', 'url2']
    }
  };

I am looking to enforce strict typing for this property in order to improve error validation. How would you define this structure using a TypeScript interface?

typescripttypes

Answer №1

If you're looking to use the same name for a property and its corresponding subproperty's value, unfortunately that might not be possible...

However, if you simply want to assign names to properties, it can be done quite easily:

type MyType = {
  default: {
    name: string;
    category: string[];
    urls: string[]
  }
  [key: string]: {
    name: string;
    category: string[];
    urls: string[];
  }
};

To enhance readability or if the structure is needed elsewhere, consider adding a subtype like this:

type MySubType = {
  name: string;
  category: string[];
  urls: string[];
};

type MyType = {
  default: MySubType;
  [key: string]: MySubType;
};

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