import { FormControl } from '@angular/forms';
/**
 *
 * @example
 *
 *  form = new FormGroup({
 *    image: new FormControl(null, [Validators.required, allowedFileTypes(['png', 'jpeg'])])
 *  });
 */
export declare function allowedFileTypes(types: string[]): (control: FormControl) => {
    invalidFileType: {
        extension: string;
    };
};
/**
 *
 * @example
 *
 *  form = new FormGroup({
 *    image: new FormControl(null, [Validators.required, maxFileSize(3)])
 *  });
 */
export declare function maxFileSize(size: number): (control: FormControl) => {
    invalidSize: {
        currentSize: number;
        expected: number;
    };
};