@harmoniclabs/plu-ts-onchain/dist/utils/IsSingleKey.d.ts

An embedded DSL for Cardano smart contracts creation coupled with a library for Cardano transactions, all in Typescript

type SingleKeyObj<K extends string | number | symbol, V = any> = {
    [Prop in K]: (Record<Prop, V> & Record<Exclude<K, Prop>, never>) extends infer O ? {
        [Q in keyof O]: O[Q];
    } : never;
}[K];
export default SingleKeyObj;
export type IsSingleKey<Obj extends object> = Obj extends SingleKeyObj<keyof Obj> ? true : false;