import { spawn } from "node:child_process";
export interface NativeRuntimeIo {
    stdin?: NodeJS.ReadableStream;
    stdout?: NodeJS.WritableStream;
    stderr?: NodeJS.WritableStream;
    env?: NodeJS.ProcessEnv;
    spawnProcess?: typeof spawn;
}
export declare function runNativeEccRuntime(argv: readonly string[], io?: NativeRuntimeIo): Promise<number>;