@bitty/maybe/types/Maybe.d.ts

Maybe

import type None from './None.js';
import type Some from './Some.js';
type Maybe<T> = None<T> | Some<T>;
export type MaybePattern<T, T2> = {
    none: () => T2;
    some: (value: T) => T2;
};
export interface MaybeMethods<T> {
    alt(fn: () => Maybe<T>): Maybe<T>;
    map<T2>(fn: (value: T) => T2): Maybe<T2>;
    then<T2>(fn: (value: T) => T2 | Maybe<T2>): Maybe<T2>;
    chain<T2>(fn: (value: T) => Maybe<T2>): Maybe<T2>;
    isNone(): this is None<unknown>;
    isSome(): this is Some<unknown>;
    match<T2>(pattern: MaybePattern<T, T2>): T2;
    fold<T2>(onLeft: () => T2, onRight: (value: T) => T2): T2;
    getOrElse(onLeft: () => T): T;
    unwrap(): T | null;
}
export default Maybe;
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