Solving the TypeScript error: "Element implicitly has an 'any' type because an expression of type 'string' cannot be used to index type"

I'm having difficulty properly declaring a variable in my code.

Here is the code snippet I am working with:

ngOnInit(): void {
this.activatedRoute.fragment.subscribe(numberOfTab => {
if (numberOfTab) {
this.tabs[numberOfTab].active = true;
} else {...}

The issue is that I'm seeing an error message stating 'Element implicitly has an 'any' type because expression of type 'string' can't be used to index type 'landingPage: { id: 'landingPage', heading: 'shop.landingPage', active: false, loaded: true }'.

I am unsure why this error is happening and how I can resolve it.

If anyone can provide some insight, I would greatly appreciate it! Thank you.

angulartypescript

Answer №1

Develop a user-friendly interface for organizing tabs and specify each tab as a unique attribute, then link this attribute to the tabs variable

interface TabsInfo {
  [key: string]: {
    id: string;
    title: string;
    isActive: boolean;
    isLoaded: boolean;
  };
}

tabsData: TabsInfo = {
  homeTab: {
    id: 'homeTab',
    title: 'Home',
    isActive: true,
    isLoaded: false,
  },
};

Answer №2

As far as I know, Typescript does not have insight into the value of activatedRoute.fragment. Because of this, numberOfTab is assigned a type of any. When attempting to access the object in tabs[numberOfTab], it essentially means "tabs[anything]". The result is unpredictable for Typescript. In this scenario, you are trying to modify the "active" property of that unknown value.

Typescript is simply cautioning you: It cannot determine the content of tabs[numberOfTab].

To address this, you can explicitly define the type of each element. For instance, (numberOfTab: number) could be specified. Alternatively, you can continue with the any type, such as (this.tabs[numberOfTab] as any).active = true

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