/**
 * Calculates the mass of a sequence.
 *
 * @param seq - The sequence of amino acids.
 * @param massDict - A dictionary of masses for the amino acids.
 * @param NTerminus - The mass of the N-terminus.
 * @param OTerminus - The mass of the O-terminus.
 * @param withWater - Whether to include the mass of water.
 * @returns The mass of the sequence.
 */
export declare function calculateMass(seq: any[], massDict?: Record<string, number>, NTerminus?: number, OTerminus?: number, withWater?: boolean): number;
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