/**
 * Extends the Performance interface to include the memory property.
 */
export interface PerformanceWithMemory extends Performance {
    memory?: {
        usedJSHeapSize: number;
    };
}
/**
 * Gets the memory usage based on the environment.
 * @returns The current memory usage in bytes, or undefined if not supported.
 */
export declare function getMemoryUsage(): number | undefined;