Typescript interface specifically designed for an array of objects containing nested objects

My current array of objects looks like this:

export const EXAMPLE_CONFIG: IExampleConfig = [
 {
  urlPath: '/test/test',
  page: 'test',
  fields: {
   fullName: 'a',
   mobilePhoneNumber: 'b',
   emailAddress: 'c',
   .......
  }
 },
 {
  ... same as above
 },
]

I've defined an interface as follows:

export interface IExampleConfig {
  path: string;
  pageTitle: string;
  fields: { [key: string]: string };
}

An error is being returned: Type '({ path: string; pageTitle: string; fields: { fullName: string; mobilePhoneNumber: string; emailAddress: string; emailIsOwn: string; mediasource: string; }; } | { path: string; pageTitle: string; fields: { ...; }; } | ... 7 more ... | { ...; })[]' is missing the following properties from type 'IExampleConfig': path, pageTitle, fields.

Answer №1

Instead of using the following syntax:

export interface IExampleConfig {
  path: string;
  pageTitle: string;
  fields: { [key: string]: string };
}

consider trying out this approach:

export interface IExampleConfig {
  path?: string;
  pageTitle?: string;
  fields?: { [key: string]?: string };
}

In TypeScript, ? indicates that an attribute in the interface is optional.

Answer №2

It appears that you may have the wrong type.

To rectify this, follow these steps:

export const EXAMPLE_CONFIG: IExampleConfig[]

instead of:

export const EXAMPLE_CONFIG: IExampleConfig

Also, if you wish to make the interface optional without turning the entire interface optional, consider using the Typescript utility type - Partial. This allows you to create an optional interface based on usage.

Interface Declaration:

export interface IExampleConfig {
  path: string;
  pageTitle: string;
  fields: { [key: string]: string };
}

Example Usage:

let example: Partial<IExampleConfig> = { path: 'path/to/file' }

For more information, refer to: [https://www.typescriptlang.org/docs/handbook/utility-types.html#partialt][1]

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