type BinaryValue = boolean | "on" | "off";
type PromiseLikeBinaryValue = PromiseLike<BinaryValue>;
type UnaryFunction<T> = () => T;
type FlagValue = BinaryValue | UnaryFunction<BinaryValue> | UnaryFunction<PromiseLikeBinaryValue>;
/**
 * @example
 * ```ts
 * Flag({
 *    USER_PROFILE_V2: 'on',
 *    USER_PROFILE_V3: () => 'on',
 *    USER_PROFILE_V4: () => Promise.resolve('on'),
 * })
 * ```
 */
type PluginOption = Record<string, FlagValue>;

export type { PluginOption as P };