Understanding and Resolving the ‘Property ‘profileStore’ is missing’ Error in TypeScript with MobX React
If you’re working with MobX React in TypeScript, you may encounter an error message like:
Property 'profileStore' is missing in type '{}' but required in type 'Readonly<AppProps>'.ts(2741)
MainNote.tsx(9, 3): 'profileStore' is declared here.
This error occurs when the profileStore prop is missing from the AppProps type, but it’s actually required in the Readonly<AppProps> type.
Why does the error occur?
MobX injects the profileStore prop automatically, but TypeScript needs to know about it in order to ensure type-safety. By default, TypeScript assumes props are optional, hence the error message.
Solution 1: Make profileStore props mandatory
To resolve the error, you can make the profileStore prop mandatory by changing the AppProps interface declaration:
interface AppProps {
profileStore: IProfileStore;
}
This change communicates to TypeScript that the profileStore prop is required.
Solution 2: Set default props
If you don’t want to pass the prop explicitly, you can set it as a default prop in the component:
static defaultProps = { profileStore: {} };
This allows the component to function even if the prop is not explicitly provided.
Solution 3: Curly braces import issue
In some cases, this error can occur when using withStyles and incorrectly importing the class. Ensure you import the default export without curly braces:
import MainNote from './MainNote';
If you use curly braces, you will import the class itself without applying the styles, resulting in missing classes.
By following these solutions, you should be able to resolve the ‘Property ‘profileStore’ is missing’ error in your MobX React TypeScript application.
Did you find this troubleshooting guide helpful? Let us know in the comments below!
