import type { TemplateResult } from 'lit';
import { nothing } from 'lit';
export type PlaygroundControlType = 'text' | 'textarea' | 'boolean' | 'select';
export interface PlaygroundControl {
    key: string;
    label: string;
    type: PlaygroundControlType;
    section: string;
    placeholder?: string;
    rows?: number;
    fullWidth?: boolean;
    options?: {
        value: string;
        label: string;
    }[];
}
export type PlaygroundProps = Record<string, string | boolean>;
export interface PlaygroundPreviewHandlers {
    onPropChange: (key: string, value: string | boolean) => void;
}
export interface PlaygroundDefinition {
    tag: string;
    label: string;
    description?: string;
    defaults: PlaygroundProps;
    controls: PlaygroundControl[];
    formatUsage: (props: PlaygroundProps) => string;
    renderPreview: (props: PlaygroundProps, handlers?: PlaygroundPreviewHandlers) => TemplateResult | HTMLElement;
    onPropChange?: (key: string, value: string | boolean, props: PlaygroundProps) => Partial<Record<string, string | boolean | undefined>> | undefined;
    getPreviewClass?: (props: PlaygroundProps) => string;
}
export interface ThemeChangeDetail {
    palette: 'nuxt' | 'next';
    mode: 'light' | 'dark';
}
export interface PropChangeDetail {
    key: string;
    value: string | boolean;
}
export declare function groupControlsBySection(controls: PlaygroundControl[]): Map<string, PlaygroundControl[]>;
/** Omit empty string attributes from Lit templates. */
export declare function whenString(value: unknown): typeof nothing | string;
/** Omit false boolean attributes from Lit templates. */
export declare function whenBoolean(value: unknown): typeof nothing | true;
/** Omit string attributes equal to a default value. */
export declare function whenStringNotDefault(value: unknown, defaultValue: unknown): typeof nothing | string;
export declare function formatUsageFromDefaults(tag: string, props: PlaygroundProps, defaults: PlaygroundProps, attributeNames?: Record<string, string>): string;
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