export const cloneMethod = Symbol.for('fast-check/cloneMethod'); export function hasCloneMethod(instance) { return (instance !== null && (typeof instance === 'object' || typeof instance === 'function') && cloneMethod in instance && typeof instance[cloneMethod] === 'function'); } export function cloneIfNeeded(instance) { return hasCloneMethod(instance) ? instance[cloneMethod]() : instance; }