/**
 * Build a {@link CoinModuleApi} method stub that always throws a standardized
 * "not supported" error. Use it for optional API methods a module does not implement.
 *
 * The returned function is tagged so the framework can tell it apart from a real
 * implementation — see {@link isNotSupportedStub}.
 *
 * @param name the API method name, used in the error message
 * @returns a function that throws `"<name> is not supported"` when invoked
 */
export declare const notSupported: (name: string) => () => never;
/**
 * Tells whether a value is a stub produced by {@link notSupported}, i.e. a placeholder
 * rather than a real implementation.
 *
 * **Limitation** — only stubs built by {@link notSupported} are detectable. A module that
 * hand-rolls `() => { throw new Error('x is not supported') }` inline is indistinguishable
 * from a real implementation, because whether a function throws cannot be known without
 * calling it. Modules should therefore either omit an unsupported method entirely (the
 * migrated shape) or build its stub with {@link notSupported}.
 */
export declare function isNotSupportedStub(value: unknown): boolean;
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