import type { BridgeChunk, BridgeOptions, BridgeResult, CLIBridge } from "./types.js";
export declare abstract class BaseAPIBridge implements CLIBridge {
    readonly name: string;
    protected apiKey: string;
    protected model: string;
    protected apiBase?: string;
    protected inputTokens: number;
    protected outputTokens: number;
    constructor(opts: {
        name: string;
        apiKey: string;
        model: string;
        apiBase?: string;
    });
    available(): Promise<boolean>;
    protected resetTokenCounts(): void;
    protected setInputTokens(tokens: number): void;
    protected setOutputTokens(tokens: number): void;
    protected getTokenCounts(): {
        input: number;
        output: number;
    };
    protected streamSSE(res: Response): AsyncIterable<string>;
    /**
     * Check response status and throw BridgeError on non-ok responses.
     */
    protected assertOk(res: Response): Promise<void>;
    abstract execute(prompt: string, options?: BridgeOptions): Promise<BridgeResult>;
    abstract stream(prompt: string, options?: BridgeOptions): AsyncIterable<BridgeChunk>;
}
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