import { Request } from 'express';
/** Contains a template that generates HTML. */
export default abstract class EmailTemplate {
    /** Loads the handlebars template contents as a string. */
    protected abstract loadTemplate(): Promise<string>;
    /** Loads the handlebars template for plaintext emails as a string. */
    protected abstract loadTextTemplate(): Promise<string>;
    /** The compiled template. */
    private template;
    /** The compiled plaintext template */
    private textTemplate;
    /** Merges data into the handlebars template */
    merge(req: Request, data: any): Promise<MergedContents>;
}
/** Returns the external base URL for the given request */
export declare function getExternalBase(req: Request, opts?: Partial<ExternalBaseLoadingOptions>): Promise<string>;
/** Options when loading the external base URL */
export interface ExternalBaseLoadingOptions {
    forceDefault: boolean;
}
/** The merged contents of a template */
export interface MergedContents {
    html: string;
    text: string;
}