export declare class FnModifiers {
    readonly cnst: 'const' | '';
    readonly volatile: 'volatile' | '';
    readonly ref: '&' | '&&' | '';
    readonly noexcept: 'noexcept' | '';
    constructor(cnst?: 'const' | '', volatile?: 'volatile' | '', ref?: '&' | '&&' | '', noexcept?: 'noexcept' | '');
    private static readonly cvPermut;
    private static readonly refPremut;
    private static readonly noexceptPremut;
    static join(m: FnModifiers): string;
    static getAllCvPermuts(): readonly [FnModifiers, FnModifiers, FnModifiers, FnModifiers];
    static getAllRefPermuts(): readonly [FnModifiers, FnModifiers, FnModifiers];
    static getAllNoexceptPermuts(): readonly [FnModifiers, FnModifiers];
    static getAllPermuts(): Generator<{
        cnst: "" | "const";
        volatile: "" | "volatile";
        ref: "" | "&" | "&&";
        noexcept: "" | "noexcept";
    }, void, unknown>;
    static getCombinedPermuts(modifiersArr: readonly (readonly FnModifiers[])[]): Generator<FnModifiers, void, undefined>;
    private static getCombinedPermutsImpl;
}
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