/**
 * Strategy for changing the component's @Input() variable.
 */
export declare enum EChangesStrategy {
    /**
     * Called on every change.
     */
    Each = 0,
    /**
     * Called only on the first change.
     */
    First = 1,
    /**
     * Called on every change except the first.
     */
    NonFirst = 2
}
export interface TrackChangesOptions {
    /**
     * Change strategy.
     * @default EChangesStrategy.Each
     */
    strategy?: EChangesStrategy;
    /**
     * Compare the previous value with the current one
     * and execute the method only if the values differ.
     *
     * Values must be immutable, as values are compared by reference.
     * @default false
     */
    compare?: boolean;
}
/**
 * Decorator of lifecycle hook ngOnChanges, that call specified method when changes prop (@Input) value.
 * -------
 *
 * Method decorator.
 *
 * @param prop Variable name of Input, that will be call method when changes.
 * @param methodName The name of the method that will be called when the variable changes.
 * @param options Options.
 */
export declare function TrackChanges<T>(prop: string, methodName: string, options?: TrackChangesOptions): MethodDecorator;