import { SimpleChange } from '@angular/core';
/**
 * This interface extends `SimpleChange` for type checking
 * in `ngOnChanges` method
 *
 * @template T The type of component
 */
export interface ComponentChange<T, P extends keyof T> extends SimpleChange {
    /**
     * The previous value for component property
     */
    previousValue: T[P];
    /**
     * The current value for component property
     */
    currentValue: T[P];
}
/**
 * This type describes the keys of component to be checked on compilation
 * to prevent using unexisting properties in `ngOnChanges` method
 */
export declare type ComponentChanges<T> = {
    [P in keyof T]: ComponentChange<T, P>;
};