import { InjectionToken, Provider } from '@angular/core';
import type { HLJSApi, LanguageFn } from 'highlight.js';
import { KbqCodeBlockFile } from './types';
import * as i0 from "@angular/core";
/** `highlight.js` configuration */
export type KbqCodeBlockHighlightJsConfig = Partial<{
    /** Lazy loader for highlight.js core (no bundled languages). When omitted, the full bundle is loaded. */
    core: () => Promise<{
        default: HLJSApi;
    }>;
    /** Map of language name to lazy loader for that language's LanguageFn. */
    languages: Record<string, () => Promise<{
        default: LanguageFn;
    }>>;
}>;
/**
 * Injection token for configuring `KbqCodeBlockHighlightJsConfig`.
 */
export declare const KBQ_CODE_BLOCK_HIGHLIGHT_JS_CONFIG: InjectionToken<Partial<{
    /** Lazy loader for highlight.js core (no bundled languages). When omitted, the full bundle is loaded. */
    core: () => Promise<{
        default: HLJSApi;
    }>;
    /** Map of language name to lazy loader for that language's LanguageFn. */
    languages: Record<string, () => Promise<{
        default: LanguageFn;
    }>>;
}>>;
/**
 * Utility provider for `KBQ_CODE_BLOCK_HIGHLIGHT_JS_CONFIG`.
 *
 * @example
 * ```ts
 * providers: [
 *   kbqCodeBlockHighlightJsConfigProvider({
 *     core: () => import('highlight.js/lib/core'),
 *     languages: {
 *       typescript: () => import('highlight.js/lib/languages/typescript'),
 *       css: () => import('highlight.js/lib/languages/css'),
 *       html: () => import('highlight.js/lib/languages/xml')
 *     }
 *   })
 * ]
 * ```
 */
export declare const kbqCodeBlockHighlightJsConfigProvider: (options: KbqCodeBlockHighlightJsConfig) => Provider;
/**
 * Fallback language for code block if language is not supported/specified.
 *
 * List of supported languages:
 * @link https://highlightjs.readthedocs.io/en/stable/supported-languages.html
 */
export declare const KBQ_CODE_BLOCK_FALLBACK_FILE_LANGUAGE: InjectionToken<string>;
/** Utility provider for `KBQ_CODE_BLOCK_FALLBACK_FILE_LANGUAGE`. */
export declare const kbqCodeBlockFallbackFileLanguageProvider: (language: string) => Provider;
/**
 * Directive which applies syntax highlighting to the code block content.
 *
 * @docs-private
 */
export declare class KbqCodeBlockHighlight {
    private readonly nativeElement;
    private readonly document;
    private readonly renderer;
    private readonly domSanitizer;
    private readonly fallbackFileLanguage;
    private readonly window;
    private readonly config;
    private hljs;
    private readonly _pending;
    /**
     * Whether syntax highlighting is pending.
     *
     * @docs-private
     */
    readonly pending: import("@angular/core").Signal<boolean>;
    /** The code file. */
    set file(file: KbqCodeBlockFile);
    /** The starting line number. */
    startFrom: number;
    /** Whether to display line numbers for single line code block. */
    singleLine: boolean;
    private load;
    private highlight;
    private warn;
    /** Initialize the HighlightJS line numbers plugin after the hljs instance is available. */
    private initLineNumbersPlugin;
    /**
     * This method is not intended for editing.
     * Changes may lead to unpredictable behavior.
     * Source code: https://github.com/wcoder/highlightjs-line-numbers.js/blob/v2.9.0/src/highlightjs-line-numbers.js
     */
    private highlightJSLineNumbersPlugin;
    static ɵfac: i0.ɵɵFactoryDeclaration<KbqCodeBlockHighlight, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<KbqCodeBlockHighlight, "code[kbqCodeBlockHighlight]", ["kbqCodeBlockHighlight"], { "file": { "alias": "file"; "required": true; }; "startFrom": { "alias": "startFrom"; "required": false; }; "singleLine": { "alias": "singleLine"; "required": false; }; }, {}, never, never, true, never>;
    static ngAcceptInputType_startFrom: unknown;
    static ngAcceptInputType_singleLine: unknown;
}