import { Maybe } from "./maybe.js";
export type Declaration<T> = {
    readonly value: () => T;
};
export type DeclarationFromOptions<T, O extends Options<unknown>> = Declaration<Value<T, O>>;
export type Value<T, O extends Options<unknown>> = O["default"] extends undefined ? T | undefined : T;
export type Options<T> = {
    readonly default?: T;
    readonly isSensitive?: boolean;
};
export type ExactOptions<O, Expected> = O extends Expected ? Exclude<keyof O, keyof Expected> extends never ? O : never : never;
export declare function defaultFromOptions<T>(options: Options<T>): Maybe<T | undefined>;