import { UntypedFormControl, ValidationErrors, Validator } from '@angular/forms';
import * as i0 from "@angular/core";
export declare class NumberDirective implements Validator {
    private regex;
    constructor();
    onKeyDown($event: any): void;
    handleNegativeNumber($event: any): boolean;
    validate(c: UntypedFormControl): ValidationErrors;
    static ɵfac: i0.ɵɵFactoryDeclaration<NumberDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<NumberDirective, "[number][ngModel],[number][formControl],[number][formControlName]", never, {}, {}, never, never, false, never>;
}
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