Property 'displayName' does not exist on type

Property ‘displayName’ does not exist on type

If you are working with TypeScript and encounter the error “Property ‘displayName’ does not exist on type”, don’t worry, you’re not alone. This error usually occurs when you are trying to access the ‘displayName’ property on a variable, but TypeScript is unable to find it in the type definition.
There are a few solutions to this problem, depending on the context and the structure of your code. Let’s explore them:

Solution 1: Add ‘displayName’ to the type definition

If the ‘displayName’ property is missing from the type definition, you can simply add it. This is the easiest and most straightforward solution.


interface MyComponentProps {
    displayName: string;
    // Other properties...
}

By adding the ‘displayName’ property to the type definition, TypeScript will no longer throw an error when you try to access it.

Solution 2: Use type assertion

If you are certain that the variable you are working with has the ‘displayName’ property, but TypeScript is unable to infer it, you can use type assertion to tell TypeScript that the variable should be treated as having the ‘displayName’ property.


const myComponent = {
    name: 'My Component',
    displayName: 'MyComponent',
    // Other properties...
};

const displayName = (myComponent as any).displayName;

By using the ‘as’ keyword and specifying ‘any’ as the type, TypeScript will no longer throw an error and you will be able to access the ‘displayName’ property.

Solution 3: Use optional chaining

If you are unsure whether the variable you are working with has the ‘displayName’ property, you can use optional chaining to safely access it without causing an error.


const myComponent = {
    name: 'My Component',
    // Other properties...
};

const displayName = myComponent.displayName?.toUpperCase();

By using the ‘?’ operator after the ‘displayName’ property, TypeScript will only attempt to access it if it exists. If the property is missing, the expression will evaluate to ‘undefined’ instead of throwing an error.

Conclusion

The “Property ‘displayName’ does not exist on type” error in TypeScript can be resolved by either adding the ‘displayName’ property to the type definition, using type assertion, or using optional chaining. Choose the solution that best fits your code and context.

Property ‘displayName’ does not exist on type