import { FeatureLogProbCache } from "../lib/keyedCache.js";
import { LetterIndices } from "../lib/letterIndices.js";
import { Wordlist } from "../lib/wordlist.js";
import type { Linker } from "../linkers/index.js";
import * as T from "../templating/index.js";
/**
 * Computing feature LogProbs can be expensive; so we've precomputed some
 * cached values.
 */
export declare const FeatureLogProbs: FeatureLogProbCache;
type Props = {
    letterIndices: LetterIndices;
    wordlist: Wordlist;
};
/**
 * A Feature is a property that a slug can have.
 *
 * Features should be as specific as possible, like "can prepend T to get a
 * word", rather than "can prepend a letter to get a word". Instead, use
 * linkers to get more general features.
 */
export type Feature = {
    /** The name of the feature; will be used for the linker name. */
    name: T.Inline;
    /** If the `slug` has the feature, returns a description. */
    property: (slug: string, props: Props) => T.Row | null;
};
/** Feature-based linkers. */
export declare function featureLinkers(wordlist: Wordlist): Linker[];
/**
 * For testing purposes. Takes a list of features, and returns
 * a function that takes a slug and returns all features it satisfies.
 */
export declare function makeFeatureGetter(features: Feature[], wordlist: Wordlist): (slug: string) => Record<string, string>;
export {};
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