import type { StandardSchemaV1 } from "#compiled/@standard-schema/spec/index.js";
/** Marker carried by the object an extension handle produces when called. */
declare const MOUNTED_EXTENSION: unique symbol;
/**
 * Marker value an extension handle returns when called. The consumer's mount
 * file default-exports it (directly for a no-config extension, or as the result
 * of the factory call for a configured one). The build reads the mount statically
 * for its package specifier; the runtime evaluates it so the call binds config
 * into the extension's scope.
 */
export interface MountedExtension {
    readonly [MOUNTED_EXTENSION]: true;
}
/**
 * Typed handle returned by {@link defineExtension} for an extension that declares
 * config. It is the mount factory the consumer calls (`crm({ apiKey })`), which
 * validates and binds the values; the extension's own tools, hooks, and
 * connections read the bound config through {@link ExtensionHandle.config}.
 */
export interface ExtensionHandle<S extends StandardSchemaV1 = StandardSchemaV1> {
    /** Consumer mount factory: validates `values` against the schema and binds them. */
    (values: StandardSchemaV1.InferInput<S>): MountedExtension;
    /** The bound configuration, typed from the schema (defaults applied). */
    readonly config: StandardSchemaV1.InferOutput<S>;
    /** The declared config schema; read by `eve extension build`. */
    readonly schema: S;
}
/**
 * Handle returned by {@link defineExtension} for an extension with no config.
 * Mounted with a bare re-export; {@link NoConfigExtensionHandle.config} is empty.
 */
export interface NoConfigExtensionHandle {
    (): MountedExtension;
    readonly config: Record<string, never>;
    readonly schema: undefined;
}
/**
 * Declares an eve extension. Optionally takes a `config` schema — any Standard
 * Schema (e.g. a Zod object) — describing the settings a consuming agent passes
 * at the mount site.
 *
 * The default export of an extension's `extension/extension.ts` is a `defineExtension`
 * handle. A consuming agent mounts it, calling the handle to bind config
 * (`export default crm({ apiKey })`) or re-exporting it directly when there is no
 * config (`export { default } from "@acme/gizmo"`). The extension's own tools,
 * hooks, and connections read the bound config through the handle:
 *
 * ```ts
 * // extension/extension.ts
 * import { defineExtension } from "eve/extension";
 * import { z } from "zod";
 * export default defineExtension({ config: z.object({ apiKey: z.string() }) });
 *
 * // extension/tools/search.ts
 * import extension from "../extension.js";
 * const { apiKey } = extension.config;
 * ```
 *
 * The `namespace` argument is supplied by the bundler shim and is not part of the
 * authoring surface.
 */
export declare function defineExtension<const S extends StandardSchemaV1>(options: {
    readonly config: S;
}, namespace?: string): ExtensionHandle<S>;
export declare function defineExtension(options?: {
    readonly config?: undefined;
}, namespace?: string): NoConfigExtensionHandle;
export {};