import { Sigma } from './sigma.js';
export declare function safeJoinWithin(basePath: string, rel: string): string;
export declare function iterFunctionUnits(source: string): string[];
export declare class Corpus {
    readonly alphabetHash: string;
    readonly sigmaVersion: string;
    readonly totalUnits: number;
    readonly docFreq: Record<string, number>;
    constructor(alphabetHash: string, sigmaVersion: string, totalUnits: number, docFreq: Record<string, number>);
    pNat(): Record<string, number>;
    weightFn(floor?: number): (feature: string) => number;
    weightThreshold(percentile?: number): number;
}
export declare function buildCorpus(unitSources: Iterable<string>, sigma?: Sigma, iterations?: number): Corpus;
export declare function freezeCorpus(corpus: Corpus, filePath: string): string;
export declare function loadCorpus(filePath: string, sigma?: Sigma, verifyAlphabet?: boolean): Corpus;
export declare function collectProjectBackgroundSources(root: string): string[];
/**
 * Build a Corpus from a list of file paths.
 * Each file is read from disk and dispatched to the correct normalizer
 * based on its extension (.go → Go, .rs → Rust, .ts/.js → TypeScript).
 */
export declare function buildCorpusFromFiles(filePaths: string[], sigma?: Sigma, iterations?: number): Corpus;
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