import type { FileSystemAdapter } from "../../platform/adapters/base.js";
import type { ClientModuleStrategy } from "./client-module-strategy.js";
export declare const CLIENT_PAGE_ISLAND_ID = "veryfront-page-island";
export interface ClientPageIslandLayout {
    kind: "mdx" | "tsx";
    path: string;
}
export interface ClientPageIslandPlan {
    serverLayouts: ClientPageIslandLayout[];
    clientLayouts: ClientPageIslandLayout[];
}
export interface ClientPageIslandPlanOptions {
    pageSource: string;
    pagePath: string;
    projectDir: string;
    appDir: string;
    layouts: readonly ClientPageIslandLayout[];
    fs: FileSystemAdapter | null | undefined;
    strategy: ClientModuleStrategy;
}
export declare function hasClientFileName(path: string | undefined): boolean;
/** Match the client classification used by the RSC component analyzer. */
export declare function hasUseClientDirective(source: string, path?: string): boolean;
/** Detect a top-level server boundary using directive-prologue semantics. */
export declare function hasUseServerDirective(source: string): boolean;
/**
 * Split App Router layouts around the single legal server-to-client boundary.
 * Read failures remain on the server side so an uncertain layout is never
 * promoted into browser code.
 */
export declare function planClientPageIsland(options: ClientPageIslandPlanOptions): Promise<ClientPageIslandPlan | null>;
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