export interface IFileDescriptor {
    filepath: string;
    changed: boolean;
}
export interface IModifyFileInfo {
    contents: string;
    filepath: string;
}
export declare type Modifier = (fileInfo: IModifyFileInfo) => Promise<string> | string;
/**
 * Modifies the contents of each of the provided files by calling the `modifier` function on each file.
 * @param files The files to modify.
 * @param modifier The modifier function.
 */
export declare function modifyFile(files: string[] | string, modifier: Modifier): Promise<IFileDescriptor[]>;