import type { CompletionRequest, CompletionResult, CompletionStreamEvent } from '../types.js';
import type { TransportCodec, CodecCapabilities, NormalizedToolDefinition, NormalizedCostRecord } from '../codec.js';
export declare class GoogleCodec implements TransportCodec {
    readonly transportId = "google";
    readonly capabilities: CodecCapabilities;
    decodeRequest(body: Record<string, unknown>): CompletionRequest;
    encodeResult(result: CompletionResult): unknown;
    encodeStreamChunk(event: CompletionStreamEvent): string;
    normalizeTools(tools: unknown[]): NormalizedToolDefinition[];
    denormalizeTools(tools: NormalizedToolDefinition[]): unknown[];
    extractCostRecord(result: CompletionResult): NormalizedCostRecord | undefined;
}