import { CommandPreprocessor, Options, RunOptions } from '../../types';
export interface TemplateHelper<O = any, R = any, RO = any, RR = any, CRO extends RunOptions = RunOptions> {
    name: string;
    fnCompileTime: (this: TemplateHelper & {
        options: CRO;
    }, options: O) => R;
    fnRunTime?: (options: RO) => RR;
}
export declare class Template implements CommandPreprocessor {
    protected templateOptions: {
        async: boolean;
        escape: (s: string) => string;
        rmWhitespace: boolean;
    };
    protected templateRuntimeOptions: {
        delimiter: string;
        async: boolean;
        escape: (s: string) => string;
        rmWhitespace: boolean;
    };
    constructor();
    name: string;
    fnCompileTime(context: RunOptions): Promise<RunOptions>;
    fnRuntime(commandOptions: Options, commandIndex: number, runOptions: RunOptions): Promise<void>;
}
/**
 * Allows to change the context object on which templates are evaluated to add new properties or functions
 * so they can be evaluated in command templates.
 */
export declare function addTemplateHelper<O = any, R = any, RO = any, RR = any, CRO extends RunOptions = RunOptions>(h: TemplateHelper<O, R, RO, RR, CRO>): void;