import { InjectionToken, Provider } from '@angular/core';
import { VudYearMonthStruct } from './year-month-picker.model';
import * as i0 from "@angular/core";
export declare function VUD_YEAR_MONTH_PICKER_PARSER_FORMATTER_FACTORY(): VudYearMonthParserFormatterDefault;
/**
 * Converts between the internal `VudYearMonthStruct` model presentation and a `string` that is displayed in the
 * input element.
 *
 * When user types something in the input this service attempts to parse it into a `VudYearMonthStruct` object.
 * And vice versa, when users selects a month in the year month picker with the mouse, it must be displayed as a `string`
 * in the input.
 *
 * Default implementation uses the ISO 8601 format, but you can provide another implementation via DI
 * to use an alternative string format or a custom parsing logic.
 */
export declare abstract class VudYearMonthParserFormatter {
    /**
     * Parses the given `string` to an `VudYearMonthStruct`.
     *
     * Implementations should try their best to provide a result, even
     * partial. They must return `null` if the value can't be parsed.
     */
    abstract parse(value: string): VudYearMonthStruct | null;
    /**
     * Formats the given `VudYearMonthStruct` to a `string`.
     *
     * Implementations should return an empty string if the given date is `null`,
     * and try their best to provide a partial result if the given date is incomplete or invalid.
     */
    abstract format(date: VudYearMonthStruct | null): string;
    static ɵfac: i0.ɵɵFactoryDeclaration<VudYearMonthParserFormatter, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<VudYearMonthParserFormatter>;
}
export type VudYearMonthPickerFormats = {
    [locale: string]: {
        input: string[];
        output: string;
    };
};
export declare const VUD_DEFAULT_YEAR_MONTH_PICKER_FORMATS: VudYearMonthPickerFormats;
export declare const VUD_YEAR_MONTH_PARSER_FORMATTER_CONFIG: InjectionToken<VudYearMonthPickerFormats>;
export declare function extendVudYearMonthParserFormatter(formats: VudYearMonthPickerFormats): Provider;
export declare class VudYearMonthParserFormatterDefault extends VudYearMonthParserFormatter {
    /** @ignore */
    private readonly locale;
    /** @ignore */
    private readonly formats;
    parse(value: string): VudYearMonthStruct | null;
    format(date: VudYearMonthStruct): string;
    private dateFormatToRegexp;
    private addYearPadding;
    private printUnkownLocaleWarning;
    static ɵfac: i0.ɵɵFactoryDeclaration<VudYearMonthParserFormatterDefault, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<VudYearMonthParserFormatterDefault>;
}