/**
 * Generates a stable, unique string key for any JS value.
 *
 * - null / undefined => 'null' / 'undefined'
 * - string / number / boolean => `${type}:${value}` (e.g. 'string:hello', 'number:42',
 *   'boolean:false')
 * - registered symbols (`Symbol.for('foo')`) => 'symbol:foo'
 * - objects / functions / non-registered symbols => one-time ID (e.g. 'ref:1', 'ref:2', etc.)
 *
 * @param value - Any JavaScript value.
 * @returns A string that uniquely and consistently identifies the value.
 */
export declare function getKey(value: unknown): string;
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