I encountered an issue in my TypeScript code:
error message: 'Type 'TransitionStyles' cannot be used as an index type.'
I'm wondering if there's a way to modify my interface so that it can be used as an index type as well:
export interface TransitionStyles {
entering: Object
entered: Object
exiting: Object
exited: Object
[key: string]: Object
}
or do I need to switch to a different interface like this:
export type TransitionState = 'entering' | 'entered' | 'exiting' | 'exited'
It seems like you're looking for something along these lines:
export interface TransitionStyles {
entrance: object;
existing: object;
exit: object;
gone: object;
}
export type TransitionPhase = keyof TransitionStyles;
export type PromisedTransitionStyles = {
[P in TransitionPhase]: Promise<TransitionStyles[P]>
};
Keep in mind that by adding the string index signature back with [key: string]: TransitionPhase, the key type TransitionPhase will default to simply being string as the broader type takes precedence over the specific components of the union in string | "specific".
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