/** A constructor. */
export interface Ctor<T> {
    new (...args: any[]): T;
}
/** A record key. */
export declare type RecordKey = string | symbol;
/** Decorator for a function. */
export declare type FunctionDecorator = (trg: Object, key: RecordKey, desc: PropertyDescriptor) => void;
/** Decorator for a property accessor of a given type. */
export declare type TypedAccessorDecorator<P> = <K extends RecordKey, T extends Partial<Record<K, P>>>(target: T, key: K, desc: TypedPropertyDescriptor<P>) => void;
/** Decorator for a property or field of a given type. */
export declare type TypedPropertyDecorator<P> = <K extends RecordKey, T extends Partial<Record<K, P>>>(target: T, key: K) => void;
/** Decorator for a function argument of a given type. */
export declare type TypedArgumentDecorator<P> = <K extends RecordKey, T extends Partial<Record<K, P>>>(target: T, key: K, idx: number) => void;
/**
 * Whether a value is considered as having been provided.
 * Certain 'falsy' values pass, including 0, 0n, NaN.
 */
export declare const isProvided: (v: unknown) => boolean;
/**
 * Custom validator function. The value is supplied, along with the object and
 * prototype information (to best retrieve other metadata if required).
 */
export declare type CustomValidator = (val: unknown, obj: Object, proto: any) => string | boolean;
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