import type { FlagValue } from '../spec/types.ts';
export interface KeyMods {
    numeric: boolean;
    generalNumeric?: boolean;
    human: boolean;
    version: boolean;
    month: boolean;
    fold: boolean;
    reverse: boolean;
    dictionary?: boolean;
    ignoreNonprinting?: boolean;
}
export interface Key {
    startField: number;
    startChar: number;
    startSkip: boolean;
    endField: number | null;
    endChar: number | null;
    endSkip: boolean;
    mods: KeyMods;
}
export interface SortConfig {
    keys: Key[];
    fieldSep: string | null;
    reverse: boolean;
    unique: boolean;
    stable: boolean;
}
export declare function parseKeydef(spec: string, globalMods: KeyMods, globalSkip: boolean): Key;
export declare function buildConfig(flags: Record<string, FlagValue>): SortConfig;
export declare function computeFields(line: string, fieldSep: string | null): [number, number, number][];
export declare function extract(line: string, fields: [number, number, number][], key: Key): string;
export declare function compareLines(a: string, b: string, cfg: SortConfig): number;
export declare function sortLines(lines: string[], cfg: SortConfig): string[];
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