/**
 * Cloudflare requires a named export on the deployed Worker for every
 * entrypoint, Durable Object, and Workflow class an application defines. Which
 * classes those are cannot be determined statically — the entry module has to
 * be evaluated and its exports classified by prototype chain.
 *
 * The classification runs inside the Worker (see {@link exportTypesModuleSource})
 * and the result is reported to the dev server over the HMR channel, so a dev
 * server can regenerate its Worker wrappers whenever the exports change.
 */
export type ExportType = "DurableObject" | "WorkerEntrypoint" | "WorkflowEntrypoint";
/** Maps each named export of a Worker entry to the kind of export it is. */
export type ExportTypes = Record<string, ExportType>;
/**
 * HMR event the Worker entry uses to report its export types to the dev server.
 */
export declare const WORKER_EXPORT_TYPES_EVENT = "distilled-cloudflare:worker-export-types";
/** Specifier of the virtual module that classifies a Worker entry's exports. */
export declare const EXPORT_TYPES_MODULE_ID = "distilled:export-types";
/** Resolved id of {@link EXPORT_TYPES_MODULE_ID}. */
export declare const RESOLVED_EXPORT_TYPES_MODULE_ID = "\0distilled:export-types";
/**
 * Source of {@link EXPORT_TYPES_MODULE_ID}. It runs inside the Worker, where
 * `cloudflare:workers` is available, so it is emitted as source rather than
 * imported from here.
 */
export declare const exportTypesModuleSource = "import {\n  DurableObject,\n  WorkerEntrypoint,\n  WorkflowEntrypoint,\n} from \"cloudflare:workers\";\n\nconst baseClasses = [\n  [\"WorkerEntrypoint\", WorkerEntrypoint],\n  [\"DurableObject\", DurableObject],\n  [\"WorkflowEntrypoint\", WorkflowEntrypoint],\n];\n\nexport function getExportTypes(module) {\n  const exportTypes = {};\n\n  for (const [key, value] of Object.entries(module ?? {})) {\n    if (key === \"default\") {\n      continue;\n    }\n\n    let exportType;\n\n    if (typeof value === \"function\") {\n      for (const [type, baseClass] of baseClasses) {\n        if (baseClass.prototype.isPrototypeOf(value.prototype)) {\n          exportType = type;\n          break;\n        }\n      }\n\n      // A class that extends none of the base classes is most likely a Durable\n      // Object written against the original, non-subclassing API.\n      exportType ??= \"DurableObject\";\n    } else if (typeof value === \"object\" && value !== null) {\n      // A plain object export is an `ExportedHandler`, i.e. a named entrypoint.\n      exportType = \"WorkerEntrypoint\";\n    }\n\n    if (exportType !== undefined) {\n      exportTypes[key] = exportType;\n    }\n  }\n\n  return exportTypes;\n}\n";
/**
 * Narrows a value received over the HMR channel to {@link ExportTypes}.
 */
export declare function isExportTypes(value: unknown): value is ExportTypes;
/**
 * Returns `true` if any export was added, removed, or changed type.
 */
export declare function haveExportTypesChanged(previous: ExportTypes, next: ExportTypes): boolean;
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