import { type DynamicContext } from 'ag-charts-core';
import type { ChartRegistry } from '../../module/moduleContext';
export declare class FontManager {
    private readonly ctx;
    private observers;
    private destroyed;
    private pendingFontLoad;
    private readonly cleanup;
    private readonly confirmedFontSpecs;
    private watchedFontSet?;
    constructor(ctx: DynamicContext<ChartRegistry>);
    private readonly flushFontLoad;
    private notifyFontLoad;
    private readonly onFontSetChange;
    updateFonts(fonts?: Set<string>): void;
    waitForFonts(fontSpecs?: Set<string>): void;
    private watchFontSet;
    private unwatchFontSet;
    destroy(): void;
    private loadFonts;
    private observeFontStatus;
}