import { ElementRef, OnDestroy } from '@angular/core';
import { Subject } from 'rxjs/Subject';
export declare type GhThemeVariant = 'light' | 'dark' | null;
export declare function getGhThemeNotValidError(name: string): Error;
export declare class GhTheme implements OnDestroy {
    private _elementRef;
    private _parentTheme;
    /**
     * Theme name and the variant.
     * could be:
     * - royalblue
     * - royalblue:light
     * - royalblue:dark
     * - :light
     * - :dark
     */
    ghTheme: string;
    /** Name of the specified theme (royalblue, ...) */
    readonly name: string | null;
    /** Whether the theme is the light or dark variant */
    readonly variant: GhThemeVariant;
    /** @internal The level of depth */
    readonly _depthLevel: number;
    /** @internal Emits on state change */
    readonly _stateChanges: Subject<void>;
    private _name;
    private _variant;
    private _parentSub;
    constructor(_elementRef: ElementRef, _parentTheme: GhTheme);
    ngOnDestroy(): void;
    /** Generates the theme class names for the currently defined name and variant */
    private _genClassNames();
    /** Replaces classes on the host element */
    private _replaceHostClasses(newClasses?, oldClasses?);
    /** Notify developers if max depth level has been exceeded */
    private _warnIfDepthExceeded();
}