/** Renderer-local NodeBuilder work observed during the current development session. */
export interface ThreeBlocksTslBuildSnapshot {
    readonly builds: number;
    readonly buildMs: number;
    readonly firstLoadBuildMs: number;
    /** Builds counted when the first frame ended; anything above it in `builds` ran late. */
    readonly firstLoadBuilds?: number;
    /** Synchronous `build()` time. These calls block their owning thread. */
    readonly syncBuildMs?: number;
    /** `buildAsync()` wall time, including time yielded between build stages. */
    readonly asyncBuildElapsedMs?: number;
    /** Synchronous setup retained by precompiled-state hydration. */
    readonly precompiledSetupMs?: number;
    /** Longest synchronous `build()` call. */
    readonly maxSyncBuildMs?: number;
    /** Longest synchronous `prepareForHydration()` call. */
    readonly maxPrecompiledSetupMs?: number;
    readonly firstLoadSyncBuildMs?: number;
    readonly firstLoadAsyncBuildElapsedMs?: number;
    readonly firstLoadPrecompiledSetupMs?: number;
    readonly firstLoadMaxSyncBuildMs?: number;
    readonly firstLoadMaxPrecompiledSetupMs?: number;
}
export interface ThreeBlocksTslBuildObserver {
    readonly snapshot: ThreeBlocksTslBuildSnapshot;
    freezeFirstLoad(): void;
    dispose(): void;
}
export interface ObserveThreeBlocksTslBuildsOptions {
    readonly onSnapshot?: (snapshot: ThreeBlocksTslBuildSnapshot) => void;
}
type BuildMethod = 'build' | 'buildAsync' | 'prepareForHydration';
type Clock = () => number;
type UnknownMethod = (...args: readonly unknown[]) => unknown;
/**
 * Shared-shape timing seam kept byte-for-byte equivalent to the capture client's
 * private copy. Exported so the agreement test can protect the two isolated runtimes.
 */
export declare function wrapThreeBlocksTimedBuild(builder: object, key: BuildMethod, record: (elapsedMs: number, method: BuildMethod) => void, clock?: Clock): UnknownMethod | undefined;
/** Observe Three.js NodeBuilder work created by a WebGPURenderer's backend. */
export declare function observeThreeBlocksTslBuilds(renderer: object, options?: ObserveThreeBlocksTslBuildsOptions): ThreeBlocksTslBuildObserver;
export {};