import { MD_Exporter_Parameter_Type } from "../md-exporter";
import { MD_FileContent_Interface } from "../md-filesystem";
import { MD_Observer_Interface } from "../md-observer";
import { MD_Transformer_AbstractBase } from "../md-transformer";
import { MD_Frontmatter_Parameter_Type } from "../md-frontmatter";
export declare class MD_Frontmatter_Transformer extends MD_Transformer_AbstractBase {
    parameter: MD_Frontmatter_Parameter_Type;
    constructor(parameter: MD_Frontmatter_Parameter_Type);
    add_observer(observer: MD_Observer_Interface): void;
    set_job_parameter(job_paramter: MD_Exporter_Parameter_Type): void;
    transform(file_content: MD_FileContent_Interface, index: number): MD_FileContent_Interface;
}