import type { ProviderAdapter } from "./types.js";
/**
 * Look up a provider adapter by canonical id or alias. Returns the
 * default sentinel adapter (which is safe to call) when the key is
 * unknown — never returns null.
 */
export declare function getProviderAdapter(provider: string | null | undefined): ProviderAdapter;
/** All registered adapters. Used by meta-helpers to collect modern substrings. */
export declare function listProviderAdapters(): readonly ProviderAdapter[];
