/**
 * Serialize JavaScript runtime values back to Elo code representation.
 *
 * This is useful for displaying execution results in a readable Elo-native format.
 */
/**
 * Convert a JavaScript runtime value to its Elo code representation.
 *
 * @param value - The JavaScript value to serialize
 * @returns A string containing the Elo code representation
 *
 * @example
 * toEloCode(null)                // => "null"
 * toEloCode(true)                // => "true"
 * toEloCode(42)                  // => "42"
 * toEloCode(3.14)                // => "3.14"
 * toEloCode('hello')             // => "'hello'"
 * toEloCode([1, 2, 3])           // => "[1, 2, 3]"
 * toEloCode({name: 'Alice'})     // => "{name: 'Alice'}"
 * // DateTime objects render as D-prefixed ISO strings
 * // Duration objects render as ISO duration strings
 */
export declare function toEloCode(value: unknown): string;
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