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Useful scala classes in typescript

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TypeScript

export interface Mappable<C> { map(f: (item: C) => B): Mappable; flatMap(f: (item: C) => Mappable): Mappable; mapPromise(f: (v: C) => Promise): Promise<Mappable>; flatMapPromise(f: (item: C) => Promise<Mappable>): Promise<Mappable>; }