import { Type, TypedValue } from "./types";
/**
 * An optional is an algebraic type. It holds zero or one values.
 */
export declare class OptionalType extends Type {
    static ClassName: string;
    constructor(typeParameter: Type);
    getClassName(): string;
    isAssignableFrom(type: Type): boolean;
}
export declare class OptionalValue extends TypedValue {
    static ClassName: string;
    private readonly value;
    constructor(type: OptionalType, value?: TypedValue | null);
    getClassName(): string;
    /**
     * Creates an OptionalValue, as not provided (missing).
     */
    static newMissing(): OptionalValue;
    isSet(): boolean;
    getTypedValue(): TypedValue;
    valueOf(): any;
    equals(other: OptionalValue): boolean;
}