import { ElementRef } from '@angular/core';
import { ThemeBaseDirective } from './theme-base.directive';
import { TopLevelThemeRef } from './top-level-theme-ref.service';
import { BooleanInput } from '@angular/cdk/coercion';
import * as i0 from "@angular/core";
export type ThemeVariant = 'secondary' | 'tertiary' | 'contrast';
/**
 * Provides the design tokens in the DOM subtree. Useful ro rendering theme
 * variants or wrapping the content in portals.
 * Also renders the necessary background surface for the theme's components to
 * be rendered on.
 */
export declare class ThemeRootComponent {
    private elementRef;
    private themeRef;
    private parentTheme;
    /**
     * The theme variant to render inside this element.
     * When set, the corresponding modifier class is applied to the host element
     * (e.g. `sapphire-theme--contrast`), overriding the inherited token values.
     */
    variant?: ThemeVariant;
    /**
     * When `true`, the `sapphire-surface` background class is not applied to the
     * host element.
     * @default false
     */
    noSurface: BooleanInput;
    constructor(elementRef: ElementRef, themeRef: TopLevelThemeRef, parentTheme: ThemeBaseDirective);
    ngAfterViewInit(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<ThemeRootComponent, [null, null, { optional: true; skipSelf: true; }]>;
    static ɵcmp: i0.ɵɵComponentDeclaration<ThemeRootComponent, "sp-theme-root, [sp-theme-root]", never, { "variant": "variant"; "noSurface": "noSurface"; }, {}, never, ["*"], true, never>;
}