import type { ProviderFn } from "./types.js";
export interface ResolvedModel {
    modelId: string;
    generate: ProviderFn;
    /** See `ProviderRegistration.maxInputImages`. */
    maxInputImages?: number;
    /** See `ProviderRegistration.supportsTransparentBackground`. */
    supportsTransparentBackground?: boolean;
}
/**
 * API keys per provider. Every field is optional: a provider whose key is
 * missing simply contributes no models.
 *
 * Keys are passed in explicitly rather than read from the environment so that
 * embedders (see lib.ts) can source them from their own config without having
 * to mutate `process.env`. Use `keysFromEnv()` for the standalone server's
 * historical env-var behaviour.
 */
export interface ProviderKeys {
    google?: string;
    openai?: string;
    flux?: string;
    reve?: string;
}
/** An immutable view over the models available for a given set of keys. */
export interface ImageRegistry {
    /** Friendly model names available, in registration order. */
    readonly models: string[];
    /** Preferred default model, or undefined when no keys were supplied. */
    readonly defaultModel: string | undefined;
    /** Look up a friendly name. Throws when the model is unknown/unavailable. */
    resolve(friendlyName: string): ResolvedModel;
}
/**
 * Read provider keys from an environment-like object (standalone server
 * behaviour). The provider-specific variable wins over the generic one for
 * every provider, as documented in the README — previously OpenAI alone had
 * this the other way round.
 */
export declare function keysFromEnv(env?: NodeJS.ProcessEnv): ProviderKeys;
/**
 * Build a registry from the supplied keys.
 *
 * Never exits the process and never throws on missing keys — an empty registry
 * (`models.length === 0`) is a valid result that callers decide how to surface.
 */
export declare function createRegistry(keys: ProviderKeys): ImageRegistry;
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