The types 'X' and 'string' do not intersect

I have a situation where I am using the following type:

export type AutocompleteChangeReason =
 | 'createOption'
 | 'selectOption'
 | 'removeOption'
 | 'clear'
 | 'blur';

But when I try to compress the code below, it gives me an error.

(reason: AutocompleteChangeReason) => {
   const s: AutocompleteChangeReason = 'selectOption';
   if (reason === s) {

   }
}

I have considered converting them to strings by using String.

String(a) === String(b)

What is the best practice in this case?

The error message reads:
This comparison appears to be unintentional because the types 'ControlledOptionsType' and 'string' have no overlap.ts(2367)

javascripttypescriptmaterial-ui

Answer №1

Consider utilizing an enum instead of a type

export enum AutocompleteChangeReason {
 createOption = 'createOption'
 selectOption = 'selectOption'
}

and so on...

When comparing a string like

const something = AutocompleteChangeReason.createOption // this will have the correct type

you can then compare it like:

if(something === AutocompleteChangeReason.selectOption)

edit: if you wish to explicitly define a string that you know fits a certain type use casting like so

const whatever ='createOption' as AutocompleteChangeReason

Answer №2

When utilizing the strict equality operator ===, it takes into account the types as well. In this scenario, the controlledOptionsType may contain additional properties that are not present in the AutocompleteChangeReason, which could lead to an error. However, calling reason.toString should resolve this issue.

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