/**
 * Scientific notation expansion utility.
 * Converts scientific notation strings to full decimal form.
 * @module expand-scientific
 */
/**
 * Expands scientific notation to full decimal form.
 * Handles arbitrarily large exponents without precision loss.
 * @param {string} str - String in scientific notation (e.g., "1e21", "1.5e-3")
 * @returns {string} Full decimal representation (e.g., "1000000000000000000000", "0.0015")
 * @example
 * expandScientificNotation("1e21")    // "1000000000000000000000"
 * expandScientificNotation("1.5e3")   // "1500"
 * expandScientificNotation("1e-3")    // "0.001"
 */
export declare function expandScientificNotation(str: string): string;
/**
 * Converts a number to decimal string, expanding scientific notation if needed.
 * @param {number} value - The number to convert
 * @returns {string} Decimal string representation
 */
export declare function numberToString(value: number): string;
/**
 * Checks if a string contains scientific notation.
 * @param {string} str - String to check
 * @returns {boolean} True if string contains 'e' or 'E'
 */
export declare function hasScientificNotation(str: string): boolean;