export declare class SimpleChange<T> {
    previousValue: T;
    currentValue: T;
    firstChange: boolean;
    constructor(previousValue: any, currentValue: any, firstChange: boolean);
    /**
     * Check whether the new value is the first value assigned.
     */
    isFirstChange(): boolean;
}
export type SimpleChanges<T> = {
    [key in keyof T]?: SimpleChange<T[key]>;
};