export interface IFontMetrics {
    ascent: number;
    descent: number;
    fontSize: number;
}
export declare class TextMetrics {
    static _fonts: {
        [font: string]: IFontMetrics;
    };
    static METRICS_STRING: string;
    static BASELINE_SYMBOL: string;
    static BASELINE_MULTIPLIER: number;
    static HEIGHT_MULTIPLIER: number;
    private static __canvas;
    static measureFont(font: string): IFontMetrics;
    static get _canvas(): HTMLCanvasElement;
}