/**
 * Extension boundary for a renderer loaded inside an isolated project worker.
 *
 * Core transports only a validated local module URL and its required local
 * read roots. The extension-owned module is responsible for importing and
 * adapting its rendering library inside the worker realm.
 */
export declare const IsolatedSsrRendererProviderName = "IsolatedSsrRendererProvider";
export declare const MAX_ISOLATED_SSR_RENDERER_READ_ROOTS = 16;
export declare const MAX_ISOLATED_SSR_RENDERER_URL_CHARACTERS = 4096;
export interface IsolatedSsrRendererProvider {
    /** Absolute local module URL exporting `createIsolatedSsrRenderer`. */
    readonly moduleUrl: string;
    /** Absolute local directory URLs needed to load that module and its imports. */
    readonly readRootUrls: readonly string[];
}
export interface IsolatedSsrRenderer {
    createElement(type: unknown, props: Record<string, unknown> | null, ...children: unknown[]): unknown;
    renderToReadableStream(element: unknown): Promise<ReadableStream<Uint8Array>>;
}
export interface IsolatedSsrRendererModule {
    createIsolatedSsrRenderer(): IsolatedSsrRenderer;
}
/** Validate one worker renderer module URL without resolving or importing it. */
export declare function validateIsolatedSsrRendererModuleUrl(value: unknown): string;
/**
 * Snapshot an extension-owned provider without invoking accessors or retaining
 * mutable provider metadata.
 */
export declare function snapshotIsolatedSsrRendererProvider(value: unknown): Readonly<IsolatedSsrRendererProvider>;
/** Create immutable registration metadata for an extension factory. */
export declare function createIsolatedSsrRendererProvider(moduleUrl: string, readRootUrls: readonly string[]): Readonly<IsolatedSsrRendererProvider>;
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