import { NamedTag } from './NamedTag.js';
/**
 * Validates and merges structured named tags - for example the tags carried by an individual event and
 * the tags supplied for a whole append call - into one distinct list. The first occurrence of each exact
 * (ordinal, case-sensitive) name and value pair is kept, in order. Mirrors the .NET client's
 * `NamedTagConverters.Merge`.
 * @param sources - The named tag sources to merge, in precedence order. An undefined or null source contributes nothing.
 * @returns The distinct, validated named tags.
 * @throws {@link InvalidNamedTag} when a source is not iterable, contains an entry that is not an object,
 * or contains a tag with a blank name or a non-string value.
 */
export declare function mergeNamedTags(...sources: ReadonlyArray<Iterable<NamedTag> | undefined | null>): NamedTag[];
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