/**
 * Returns true if given string contains only digits, and optionally, a sign
 * prefix.
 *
 * @param x -
 */
export declare const isNumericInt: (x: string) => boolean;
/**
 * Returns true if given string only contains an integer or floating point
 * number, optionally in scientific notiation (e.g. `-123.45e-6`).
 *
 * @param x -
 */
export declare const isNumericFloat: (x: string) => boolean;
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