/** Serve the file unchanged, serve this code instead, or refuse with a reason. */
export type ClientModule = {
    kind: "raw";
} | {
    kind: "transformed";
    code: string;
} | {
    kind: "error";
    message: string;
};
/** What to serve for one plugin's client half, compiling it only when the file
 *  on disk has changed since the last answer. */
export declare function pluginClientModule(id: string, file: string): Promise<ClientModule>;
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