import { Model } from './model';
import { MessageLevel } from './msglevel';
export declare namespace Simplex {
    interface Options {
        msgLevel?: MessageLevel;
        method?: 'primal' | 'dual' | 'dual_primal';
        pricing?: 'std' | 'pse';
        ratioTest?: 'std' | 'harris' | 'flipflop';
        tolPrimal?: number;
        tolDual?: number;
        tolPivot?: number;
        objLower?: number;
        objUpper?: number;
        limitIter?: number;
        limitTime?: number;
        logFreq?: number;
        logDelay?: number;
        presolve?: boolean;
    }
    type ReturnCode = 'ok' | 'basis_invalid' | 'basis_singular' | 'basis_ill_conditioned' | 'bounds_incorrect' | 'failure' | 'objective_lower' | 'objective_upper' | 'iteration_limit' | 'time_limit' | 'no_primal_feasible' | 'no_dual_feasible';
    function solve(model: Model, opts: Options): ReturnCode;
    function solveExact(model: Model, opts: Options): ReturnCode;
}