/**
 * Internal, opt-in asset load tracing for bounded browser diagnostics.
 *
 * The runtime does not publish this hook. A browser fixture may install the
 * global sink for one load and remove it afterwards; normal consumers pay only
 * for the guarded lookup.
 */
export interface AssetLoadTraceEvent {
    readonly phase: string;
    readonly at: number;
    readonly guid?: string;
    readonly packageUrl?: string;
    readonly artifactKey?: string;
    readonly detail?: Readonly<Record<string, unknown>>;
}
export declare function traceAssetLoadPhase(phase: string, context?: Omit<AssetLoadTraceEvent, 'phase' | 'at'>): void;
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