Encountering a type error when attempting to assign an interface to a property

In my Angular project, I am working with typescript and trying to assign the IInfoPage interface to some data.

    export interface IInfoPage {
      href: string;
      icon: string;
      routing: boolean;
      order: number;
      styleType: string;
    }

    public pageData: IInfoPage;


    this.configService.PageData.subscribe((res) => {
        this.pageData = res.SubMenu.find(data => location.pathname.includes('path'));
    })

However, when I try to access this.pageData, it alerts me with an error message:

Type 'ISubMenuType | undefined' is not assignable to type 'IInfoPageSubData'.   Type 'undefined' is not assignable to type 'IInfoPageSubData'.

Does anyone have any ideas on how to resolve this issue?

javascriptangulartypescript

Answer №1

The Array.find() method has the ability to potentially return undefined. It is important to always verify if find has indeed found a result.

To ensure that we handle this properly, we can use the following code snippet:

const result = res.SubMenu.find(data => location.pathname.includes('path'));

if(result)
  this.pageData = result;

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