import { ExportResult } from '@opentelemetry/core-1.x';
import { ReadableSpan, SpanExporter } from '@opentelemetry/sdk-trace-base-1.x';
/**
 * This is implementation of {@link SpanExporter} that prints spans to a file.
 */
export declare class FileSpanExporter implements SpanExporter {
    private file;
    constructor(filename: string);
    tryOpen(filename: string): Promise<void>;
    export(spans: ReadableSpan[], resultCallback: (result: ExportResult) => void): void;
    shutdown(): Promise<void>;
    forceFlush(): Promise<void>;
    private serialize;
    private printAndReportResult;
}
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