/** A map from letters to their indices in a given slug. */
export declare class LetterIndices {
    private readonly indices;
    constructor(indices: ReadonlyMap<string, number[]>);
    static from(slug: string): LetterIndices;
    counts(): IterableIterator<[string, number]>;
    countSet(): Set<number>;
    entries(): IterableIterator<[string, number[]]>;
    filterKeys(fn: (letter: string, indices: number[]) => boolean): string[];
    get(letter: string): number[];
    keys(): IterableIterator<string>;
}
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