export type InputOrigin = 'none' | 'default' | 'user';
export interface ProcessorArg<Input> {
    input: Input | undefined;
    inputOrigin: InputOrigin;
}
export interface UserPropertySpec<Input, Output> {
    getDefaultInput?(): Input;
    transform?(arg: ProcessorArg<Input>): Output;
}
export interface PropertyCache<Type> {
    value: Type | undefined;
    invalid: boolean;
}
export declare class UserProperty<Input, Output = Input> {
    private _spec;
    private _userInputIsSet;
    private _userInput;
    private _inputCache;
    private _outputCache;
    constructor(_spec?: UserPropertySpec<Input, Output>);
    set(value: Input): void;
    unset(): void;
    get inputAndOrigin(): ProcessorArg<Input>;
    get userInputIsSet(): boolean;
    get userInput(): Input | undefined;
    get hasDefaultInput(): boolean;
    get defaultInput(): Input | undefined;
    get input(): Input | undefined;
    get inputOrigin(): InputOrigin;
    resetInputCache(): void;
    get output(): Output;
    resetOutputCache(): void;
}