import { Tree, SchematicContext, Rule } from '@angular-devkit/schematics';
export interface IHelperSchema {
    /**
     * Singular or Comma-delimited list of helpers to generate.
     */
    name: string;
    /**
     * Optional target when adding helpers
     */
    target?: string;
}
export interface IHelperConfig {
    requiresTarget?: boolean;
    additionalSupport?: (helperChains: Array<any>, options: IHelperSchema) => (tree: Tree, context: SchematicContext) => void;
    addHelperFiles?: (options: IHelperSchema) => Rule;
    logNotes?: (options: IHelperSchema) => void;
}
export declare function buildHelperChain(helper: string, options: IHelperSchema, config: IHelperConfig, helperChain: Array<any>): void;