export interface FontMetrics {
    font: string;
    lineHeight: number;
    ascent: number;
    fullAscent: number;
    descent: number;
    leading: number;
    extraAscent?: number;
    extraDescent?: number;
    extraLineHeight?: number;
}
export declare function beep(frequency?: number, gainValue?: number, duration?: number): void;
export declare function beepPromise(frequency?: number, gainValue?: number, duration?: number): Promise<void>;
export declare function eventToKey(event: KeyboardEvent): string;
export declare function getCssValue(element: Element, property: string): string;
export declare function getCssValues(element: Element, properties: string[]): string[];
export declare function getCssVariable(name: string): string;
export declare function setCssVariable(name: string, value: string): void;
export declare function getCssRuleValue(element: Element, property: string): string | undefined;
export declare function getCssRuleValues(element: Element, properties: string[]): (string | undefined)[];
export declare function getFont(element: Element): string;
export declare function getFontMetrics(elementOrFont: Element | string, specificChar?: string): FontMetrics;
export declare function doesCharacterGlyphExist(elementOrFont: Element | string, charOrCodePoint: string | number): boolean;
export declare function getTextWidth(items: string | string[], font: string | HTMLElement, fallbackFont?: string): number;
export declare function htmlEscape(s: string, escapeQuotes?: boolean): string;
export declare function htmlUnescape(s: string): string;
export declare function initPlatformDetection(nav?: Navigator, win?: Window, smallScreen?: boolean): void;
export declare function isAndroid(): boolean;
export declare function isChrome(): boolean;
export declare function isChromeOS(): boolean;
export declare function isChromium(): boolean;
export declare function isChromiumEdge(): boolean;
export declare function isEdge(): boolean;
export declare function isFirefox(): boolean;
/**
 * @deprecated will always be false as this code no longer supports IE.
 */
export declare function isIE(): boolean;
export declare function isIOS(): boolean;
export declare function isLinux(): boolean;
export declare function iosVersion(): number;
export declare function isIOS14OrEarlier(): boolean;
export declare function isLikelyMobile(): boolean;
export declare function isMacOS(): boolean;
export declare function isOpera(): boolean;
/**
 * @deprecated no longer reliably detectable.
 */
export declare function isRaspbian(): boolean;
export declare function isSafari(): boolean;
export declare function isSamsung(): boolean;
export declare function isWindows(): boolean;
export declare function restrictPixelWidth(text: string, font: string | HTMLElement, maxWidth: number, clipString?: string): string;
export declare function setFullScreen(full: boolean): void;
export declare function setFullScreenAsync(full: boolean, throwImmediate?: boolean): Promise<void>;
export declare function toggleFullScreen(): void;
export declare function toggleFullScreenAsync(throwImmediate?: boolean): Promise<void>;
export declare function isFullScreen(): boolean;
export declare function isEffectivelyFullScreen(): boolean;
export declare function encodeForUri(s: string, spaceAsPlus?: boolean): string;
export declare function urlEncodeParams(params: Record<string, string | number | boolean | bigint | null>, spaceAsPlus?: boolean): string;
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