import { WordList, WordListSource } from "../wordlist";
/**
 * Returns a data structure that can be loaded by the TrieModel.
 *
 * It implements a **weighted** trie, whose indices (paths down the trie) are
 * generated by a search key, and not concrete wordforms themselves.
 *
 * @param sourceFiles an array of source files that will be read to generate the trie.
 */
export declare function createTrieDataStructureFromFilenames(filenames: string[], searchTermToKey: (wf: string) => string): string;
/**
 * Parses a word list from a file, merging duplicate entries.
 *
 * The word list may be encoded in:
 *
 *  - UTF-8, with or without BOM [exported by most software]
 *  - UTF-16, little endian, with BOM [exported by Microsoft Excel]
 *
 * @param wordlist word list to merge entries into (may have existing entries)
 * @param filename filename of the word list
 */
export declare function parseWordListFromFilename(wordlist: WordList, filename: string): void;
/**
 * Given a real filesystem path, this implements the WordList source.
 */
export declare class WordListFromFilename implements WordListSource {
    readonly name: string;
    constructor(filename: string);
    lines(): Generator<import("../wordlist").LineNoAndText, void, unknown>;
}