import { EventEmitter, OnChanges, SimpleChanges, ElementRef } from '@angular/core';
import { DomSanitizer } from '@angular/platform-browser';
import { HighlightJS } from './highlight.service';
import { HighlightOptions, HighlightAutoResult } from './highlight.model';
import * as i0 from "@angular/core";
export declare class Highlight implements OnChanges {
    private _hljs;
    private _sanitizer;
    private _options;
    private readonly _nativeElement;
    private _lineNumbersObs;
    code: string | null;
    languages: string[];
    lineNumbers: boolean;
    highlighted: EventEmitter<HighlightAutoResult>;
    constructor(el: ElementRef, _hljs: HighlightJS, _sanitizer: DomSanitizer, _options: HighlightOptions);
    ngOnChanges(changes: SimpleChanges): void;
    /**
     * Highlighting with language detection and fix markup.
     * @param code Accepts a string with the code to highlight
     * @param languages An optional array of language names and aliases restricting detection to only those languages.
     * The subset can also be set with configure, but the local parameter overrides the option if set.
     */
    highlightElement(code: string, languages: string[]): void;
    private addLineNumbers;
    private destroyLineNumbersObserver;
    private setTextContent;
    private setInnerHTML;
    static ɵfac: i0.ɵɵFactoryDeclaration<Highlight, [null, null, null, { optional: true; }]>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<Highlight, "[highlight]", never, { "code": "highlight"; "languages": "languages"; "lineNumbers": "lineNumbers"; }, { "highlighted": "highlighted"; }, never, never, false>;
}