import { PropertyValues } from 'lit';
import { SpectrumElement } from '../../element/index.js';
import { LINEAR_PROGRESS_VALID_SIZES } from '../../mixins/index.js';
import { MeterVariant } from './Meter.types.js';
declare const MeterBase_base: typeof SpectrumElement & {
    new (...args: any[]): import('../../mixins/index.js').SizedElementInterface;
    prototype: import('../../mixins/index.js').SizedElementInterface;
} & import('../../mixins/index.js').SizedElementConstructor & {
    new (...args: any[]): import('../../mixins/index.js').LinearProgressInterface;
    prototype: import('../../mixins/index.js').LinearProgressInterface;
};
/**
 * A non-focusable, read-only bar that shows a value inside a fixed range.
 * Implements the WAI-ARIA `meter` role on the shadow `.swc-Meter` element
 * (the host carries no ARIA).
 *
 * @attribute {ElementSize} size - The size of the meter.
 */
export declare abstract class MeterBase extends MeterBase_base {
    /**
     * The size of the meter.
     *
     * @default m
     */
    size: (typeof LINEAR_PROGRESS_VALID_SIZES)[number];
    /**
     * @internal
     *
     * A readonly array of all valid variants for the meter. Concrete
     * subclasses re-declare with their own valid set so validation logic
     * resolves against `(this.constructor as typeof MeterBase).VARIANTS`.
     */
    static readonly VARIANTS: readonly string[];
    /**
     * The variant of the meter. Drives the bar fill color.
     */
    variant: MeterVariant;
    protected willUpdate(changes: PropertyValues): void;
}
export {};