/// <reference types="node" />
import { Reporter, Results } from "../types";
export interface JSONReporterOptions {
    readonly output?: string | NodeJS.WritableStream;
}
export default class JSONReporter implements Reporter {
    private readonly outputStream;
    constructor({ output }?: JSONReporterOptions);
    onRunStart(): void;
    onResult(): void;
    onRunComplete(results: Results): void;
}