import { Strategy, Transformed } from '../Strategy';
import { ValueTransformerOptions } from '../ValueTransformerOptions';
/**
 * Applied in case a primitive type was given through TypeScript type system.
 * Note: if the value is `undefined`, this always returns `undefined`.
 *
 * For example:
 * [+] property: string;
 * [+] property?: string;
 *
 * Not applied either on these union type ones or array.
 * [-] property: string | number;
 * [-] property: string[];
 */
export declare class PrimitiveStrategy extends Strategy {
    protected transform(opts: ValueTransformerOptions): Transformed | undefined;
    static normalizeNumber(value: unknown): number;
    static normalizeString(value: unknown): string;
    static normalizeBoolean(value: unknown): boolean;
}