declare const n1 = "number";
/** Return true if `x` is a finite integer. */
export declare function isIntegerNumber(x: number): boolean;
export declare namespace isIntegerNumber {
    export { n1 as signature };
}
/** Return true if `x < 0`. */
export declare function isNegativeNumber(x: number): boolean;
export declare namespace isNegativeNumber {
    export { n1 as signature };
}
/** Return true if `x > 0`. */
export declare function isPositiveNumber(x: number): boolean;
export declare namespace isPositiveNumber {
    export { n1 as signature };
}
/** Return true if `x === 0`. */
export declare function isZeroNumber(x: number): boolean;
export declare namespace isZeroNumber {
    export { n1 as signature };
}
/** Return true if `x` is NaN (`Number.isNaN`). */
export declare function isNaNNumber(x: number): boolean;
export declare namespace isNaNNumber {
    export { n1 as signature };
}
export {};
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