import { SpanContext } from '@opentelemetry/api';
/**
 * Used to encode SpanContext to binary (toBytes) or decode SpanContext
 * from binary (fromBytes). Derived from a previous implementation in
 * opentelemetry-core (see README.md). Supports the main
 * GrpcCensusPropagator class.
 */
export declare class BinaryTraceContext {
    /**
     * Converts context to the binary format used by OpenCensus.
     *
     * @param spanContext - The SpanContext to encode
     * @returns Encoded context as a Uint8Array
     */
    static toBytes(spanContext: SpanContext): Uint8Array;
    /**
     * Converts the binary format used by OpenCensus to a SpanContext
     *
     * @param buf - Encoded context as a Uint8Array
     * @returns Decoded context or null if the incoming binary is invalid
     */
    static fromBytes(buf: Uint8Array): SpanContext | null;
}