import { HttpClient } from '@angular/common/http';
import { ErrorHandler, OnDestroy } from '@angular/core';
import { DomSanitizer, SafeHtml, SafeResourceUrl } from '@angular/platform-browser';
import { Observable } from 'rxjs';
import * as i0 from "@angular/core";
/**
 * Returns an exception to be thrown in the case when attempting to
 * load an icon with a name that cannot be found.
 * @docs-private
 */
export declare function getDashIconNameNotFoundError(iconName: string): Error;
/**
 * Returns an exception to be thrown when the consumer attempts to use
 * `<dash-icon>` without including @angular/common/http.
 * @docs-private
 */
export declare function getDashIconNoHttpProviderError(): Error;
/**
 * Returns an exception to be thrown when a URL couldn't be sanitized.
 * @param url URL that was attempted to be sanitized.
 * @docs-private
 */
export declare function getDashIconFailedToSanitizeUrlError(url: SafeResourceUrl): Error;
/**
 * Returns an exception to be thrown when a HTML string couldn't be sanitized.
 * @param literal HTML that was attempted to be sanitized.
 * @docs-private
 */
export declare function getDashIconFailedToSanitizeLiteralError(literal: SafeHtml): Error;
/** Options that can be used to configure how an icon or the icons in an icon set are presented. */
export interface IconOptions {
    /** View box to set on the icon. */
    viewBox?: string;
    /** Whether or not to fetch the icon or icon set using HTTP credentials. */
    withCredentials?: boolean;
}
/**
 * Function that will be invoked by the icon registry when trying to resolve the
 * URL from which to fetch an icon. The returned URL will be used to make a request for the icon.
 */
export declare type IconResolver = (name: string, namespace: string) => SafeResourceUrl | SafeResourceUrlWithIconOptions | null;
/** Object that specifies a URL from which to fetch an icon and the options to use for it. */
export interface SafeResourceUrlWithIconOptions {
    url: SafeResourceUrl;
    options: IconOptions;
}
/**
 * Service to register and display icons used by the `<dash-icon>` component.
 * - Registers icon URLs by namespace and name.
 * - Registers icon set URLs by namespace.
 * - Registers aliases for CSS classes, for use with icon fonts.
 * - Loads icons from URLs and extracts individual icons from icon sets.
 */
export declare class DashIconRegistry implements OnDestroy {
    private _httpClient;
    private _sanitizer;
    private readonly _errorHandler;
    private _document;
    /**
     * URLs and cached SVG elements for individual icons. Keys are of the format "[namespace]:[icon]".
     */
    private _svgIconConfigs;
    /**
     * SvgIconConfig objects and cached SVG elements for icon sets, keyed by namespace.
     * Multiple icon sets can be registered under the same namespace.
     */
    private _iconSetConfigs;
    /** Cache for icons loaded by direct URLs. */
    private _cachedIconsByUrl;
    /** In-progress icon fetches. Used to coalesce multiple requests to the same URL. */
    private _inProgressUrlFetches;
    /** Map from font identifiers to their CSS class names. Used for icon fonts. */
    /** Registered icon resolver functions. */
    private _resolvers;
    /**
     * The CSS classes to apply when an `<dash-icon>` component has no icon name, url, or font
     * specified. The default 'material-icons' value assumes that the material icon font has been
     */
    private _defaultFontSetClass;
    constructor(_httpClient: HttpClient, _sanitizer: DomSanitizer, document: any, _errorHandler: ErrorHandler);
    /**
     * Registers an icon by URL in the default namespace.
     * @param iconName Name under which the icon should be registered.
     * @param url
     */
    addSvgIcon(iconName: string, url: SafeResourceUrl, options?: IconOptions): this;
    /**
     * Registers an icon by URL in the specified namespace.
     * @param namespace Namespace in which the icon should be registered.
     * @param iconName Name under which the icon should be registered.
     * @param url
     */
    addSvgIconInNamespace(namespace: string, iconName: string, url: SafeResourceUrl, options?: IconOptions): this;
    /**
     * Sets the CSS classes to be used for icon fonts when an `<dash-icon>` component does not
     * have a fontSet input value, and is not loading an icon by name or URL.
     */
    setDefaultFontSetClass(...classNames: string[]): this;
    /**
     * Returns the CSS classes to be used for icon fonts when an `<dash-icon>` component does not
     * have a fontSet input value, and is not loading an icon by name or URL.
     */
    getDefaultFontSetClass(): string[];
    /**
     * Returns an Observable that produces the icon (as an `<svg>` DOM element) with the given name
     * and namespace. The icon must have been previously registered with addIcon or addIconSet;
     * if not, the Observable will throw an error.
     *
     * @param name Name of the icon to be retrieved.
     * @param namespace Namespace in which to look for the icon.
     */
    getNamedSvgIcon(name: string, namespace?: string): Observable<SVGElement>;
    ngOnDestroy(): void;
    /**
     * Returns the cached icon for a SvgIconConfig if available, or fetches it from its URL if not.
     */
    private _getSvgFromConfig;
    /**
     * Attempts to find an icon with the specified name in any of the SVG icon sets.
     * First searches the available cached icons for a nested element with a matching name, and
     * if found copies the element to a new `<svg>` element. If not found, fetches all icon sets
     * that have not been cached, and searches again after all fetches are completed.
     * The returned Observable produces the SVG element if possible, and throws
     * an error if no icon with the specified name can be found.
     */
    private _getSvgFromIconSetConfigs;
    /**
     * Searches the cached SVG elements for the given icon sets for a nested icon element whose "id"
     * tag matches the specified name. If found, copies the nested element to a new SVG element and
     * returns it. Returns null if no matching element is found.
     */
    private _extractIconWithNameFromAnySet;
    /**
     * Loads the content of the icon URL specified in the SvgIconConfig and creates an SVG element
     * from it.
     */
    private _loadSvgIconFromConfig;
    /**
     * Loads the content of the icon set URL specified in the
     * SvgIconConfig and attaches it to the config.
     */
    private _loadSvgIconSetFromConfig;
    /**
     * Searches the cached element of the given SvgIconConfig for a nested icon element whose "id"
     * tag matches the specified name. If found, copies the nested element to a new SVG element and
     * returns it. Returns null if no matching element is found.
     */
    private _extractSvgIconFromSet;
    /**
     * Creates a DOM element from the given SVG string.
     */
    private _svgElementFromString;
    /**
     * Converts an element into an SVG node by cloning all of its children.
     */
    private _toSvgElement;
    /**
     * Sets the default attributes for an SVG element to be used as an icon.
     */
    private _setSvgAttributes;
    /**
     * Returns an Observable which produces the string contents of the given icon. Results may be
     * cached, so future calls with the same URL may not cause another HTTP request.
     */
    private _fetchIcon;
    /**
     * Registers an icon config by name in the specified namespace.
     * @param namespace Namespace in which to register the icon config.
     * @param iconName Name under which to register the config.
     * @param config Config to be registered.
     */
    private _addSvgIconConfig;
    /** Parses a config's text into an SVG element. */
    private _svgElementFromConfig;
    /** Tries to create an icon config through the registered resolver functions. */
    private _getIconConfigFromResolvers;
    static ɵfac: i0.ɵɵFactoryDeclaration<DashIconRegistry, [{ optional: true; }, null, { optional: true; }, null]>;
    static ɵprov: i0.ɵɵInjectableDeclaration<DashIconRegistry>;
}