import type { TemplateContentV3, PredyResizeTemplate } from '@predy-js/specification';
export declare function renderImageTemplate(resizeTemplate: PredyResizeTemplate, variables: Record<string, string>, inCanvas?: HTMLCanvasElement, activeBorderIndex?: number, scaleFactor?: number): HTMLCanvasElement;
export declare function getResizedImageTemplateAsync(backgroundImage: any, template: TemplateContentV3, variables: Record<string, string>): Promise<PredyResizeTemplate>;
interface CombineImageTemplateOptions {
    templateScale?: number;
    canvas?: HTMLCanvasElement;
    activeName?: string;
    activeBorderIndex?: number;
}
export declare function _combineImageTemplate3Async(template: PredyResizeTemplate, variables?: Record<string, string>, opt?: CombineImageTemplateOptions): Promise<HTMLCanvasElement>;
export declare function combineImageTemplate3Async(rawUrl: string | HTMLImageElement | ImageBitmap | Blob, jsonTemplate: TemplateContentV3, variables?: Record<string, string>, opt?: CombineImageTemplateOptions): Promise<HTMLCanvasElement>;
export declare function calculateTextWidthWithSpacing(context: CanvasRenderingContext2D, text: string, letterSpacing: number): number;
export declare function calculateTextBoundingHeight(context: CanvasRenderingContext2D, text: string, fontSize: number): {
    height: number;
    offset: number;
    ascent?: undefined;
} | {
    height: number;
    offset: number;
    ascent: number;
};
export {};