import { PropType } from 'vue';
import { RGBA } from 'seemly';
declare const _default: import("vue").DefineComponent<{
    clsPrefix: {
        type: StringConstructor;
        required: true;
    };
    rgba: {
        type: PropType<RGBA | null>;
        default: null;
    };
    alpha: {
        type: NumberConstructor;
        default: number;
    };
    onUpdateAlpha: {
        type: PropType<(value: number) => void>;
        required: true;
    };
    onComplete: PropType<() => void>;
}, {
    railRef: import("vue").Ref<HTMLElement | null>;
    railBackgroundImage: import("vue").ComputedRef<string>;
    handleMouseDown: (e: MouseEvent) => void;
}, unknown, {}, {}, import("vue").ComponentOptionsMixin, import("vue").ComponentOptionsMixin, Record<string, any>, string, import("vue").VNodeProps & import("vue").AllowedComponentProps & import("vue").ComponentCustomProps, Readonly<{
    clsPrefix?: unknown;
    rgba?: unknown;
    alpha?: unknown;
    onUpdateAlpha?: unknown;
    onComplete?: unknown;
} & {
    alpha: number;
    clsPrefix: string;
    rgba: RGBA | null;
    onUpdateAlpha: (value: number) => void;
} & {
    onComplete?: (() => void) | undefined;
}>, {
    alpha: number;
    rgba: RGBA | null;
}>;
export default _default;