export declare type VolumeParameterChangedEvent = (newValue: any, oldValue: any, parameter: VolumeParameter) => void;
export declare type VolumeParameterValueProcessor = (value: any) => any;
export declare class VolumeParameter {
    readonly isVolumeParameter = true;
    constructor(value?: any);
    private _isInitialized;
    get isInitialized(): boolean;
    initialize(value?: any): void;
    get overrideState(): boolean;
    set overrideState(val: boolean);
    private _active;
    get value(): any;
    set value(val: any);
    private _value;
    private _valueRaw?;
    set defaultValue(val: any);
    private _defaultValue;
    /** enforce the value to be set and onValueChanged to be called if assigned */
    __init(): void;
    /** called to modify a changing value before it is saved */
    valueProcessor: VolumeParameterValueProcessor | undefined;
    /** called when a value has changed (with the final value) */
    onValueChanged: VolumeParameterChangedEvent | undefined;
    private processValue;
    private testIfValueChanged;
}