import type { ModelProvider } from './model.js';
export type ModelConfig = string | string[] | false;
export interface ProviderSettings {
    baseUrl?: string;
    apiKey?: string;
    apiKeyEnv?: string;
    headers?: Record<string, string>;
    auth?: 'bearer' | 'api-key' | 'none';
    apiKeyHeader?: string;
    project?: string;
    location?: string;
    region?: string;
    sessionToken?: string;
}
export type ProvidersConfig = Record<string, ProviderSettings>;
export interface ParsedModelRef {
    provider: string;
    modelId: string;
    original: string;
}
export interface ResolveModelProviderOptions {
    model?: ModelConfig;
    providers?: ProvidersConfig;
    env?: Record<string, string | undefined>;
    production?: boolean;
    allowMock?: boolean;
}
export interface ResolvedModelProvider {
    model?: string;
    provider?: ModelProvider;
    providerName?: string;
    modelId?: string;
    warnings: string[];
}
/**
 * Resolves a parsed `provider/model-id` ref into a concrete provider. Registered factories let
 * out-of-core packages (e.g. @fabric-harness/databricks) add providers without editing core.
 * Mirrors the signature of the built-in resolver functions below.
 */
export type ModelProviderFactory = (parsed: ParsedModelRef, providers: ProvidersConfig | undefined, env: Record<string, string | undefined>, warnings: string[]) => ResolvedModelProvider;
/**
 * Register a model provider resolvable via `FABRIC_MODEL=<name>/<model-id>`. Built-in providers
 * always take precedence; registering a name a built-in already owns has no effect on routing.
 * Idempotent by name (last registration wins). Call at module import time.
 */
export declare function registerModelProvider(name: string, factory: ModelProviderFactory): void;
/** Names of externally registered providers, for diagnostics. */
export declare function registeredModelProviders(): string[];
export declare function parseModelRef(model: string): ParsedModelRef | undefined;
export declare function resolveModelProvider(options?: ResolveModelProviderOptions): ResolvedModelProvider;
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