/**
 * Copyright 2019, 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.
 */
import { TagKey, TagMetadata, TagValue, TagValueWithMetadata } from './types';
/** TagMap is maps of TagKey -> TagValueWithMetadata */
export declare class TagMap {
    private readonly registeredTags;
    /**
     * Adds the key/value pair regardless of whether the key is present.
     * @param tagKey The TagKey which will be set.
     * @param tagValue The TagValue to set for the given key.
     * @param tagMetadata The TagMetadata associated with this Tag.
     */
    set(tagKey: TagKey, tagValue: TagValue, tagMetadata?: TagMetadata): void;
    /**
     * Deletes a tag from the map if the key is in the map.
     * @param tagKey The TagKey which will be removed.
     */
    delete(tagKey: TagKey): void;
    /** Gets the tags map without metadata. */
    get tags(): Map<TagKey, TagValue>;
    /** Gets the tags map with metadata. */
    get tagsWithMetadata(): Map<TagKey, TagValueWithMetadata>;
    /**
     * Constructs a new TagValueWithMetadata using tagValue and tagMetadata.
     * For backwards-compatibility this method still produces propagating Tags
     * (UNLIMITED_PROPAGATION) if tagMetadata is not provided or missing.
     */
    private getValueWithMetadata;
}