import type { Either } from 'fp-ts/Either';
import type { IO } from 'fp-ts/IO';
import type { Option } from 'fp-ts/Option';
import type { DocData, DocKey } from '../..';
export type Provider = {
    readonly code: 'Provider';
    readonly value: unknown;
};
export type Forbidden = {
    readonly code: 'Forbidden';
};
export type Error = Forbidden | Provider;
export type DocState = Either<Error, Option<DocData>>;
export type OnChangedCallback = (docState: DocState) => IO<undefined | void>;
export type Param = {
    readonly onChanged: OnChangedCallback;
    readonly key: DocKey;
};
export type Unsubscribe = IO<void>;
export type Fn = (p: Param) => IO<Unsubscribe>;
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