/**
 * Copyright 2018, OpenCensus Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
export * from './stackdriver-format';
export interface SpanContext {
    /** Trace ID */
    traceId: string;
    /** Span ID */
    spanId: string;
    /** Options */
    options?: number;
}
/**
 * An transport and environment neutral API for getting request headers.
 */
export interface HeaderGetter {
    getHeader(name: string): string | string[] | undefined;
}
/**
 * A transport and environment neutral API for setting headers.
 */
export interface HeaderSetter {
    setHeader(name: string, value: string): void;
}
export interface Propagation {
    extract(getter: HeaderGetter): SpanContext | null;
    inject(setter: HeaderSetter, spanContext: SpanContext): void;
    generate(): SpanContext;
}
/**
 * @deprecated since version 0.0.10 - use {@link StackdriverFormat} instead
 * All other propagation exports a class constructor, while Stackdriver v1
 * propagation exports an implementation of Propagation.
 */
export declare const v1: Propagation;
export declare const extract: (getter: HeaderGetter) => SpanContext | null;
export declare const inject: (setter: HeaderSetter, spanContext: SpanContext) => void;
export declare const generate: () => SpanContext;