/**
 * @copyright Sister Software
 * @license AGPL-3.0
 * @author Teffen Ellis, et al.
 *
 *   Order-preserving tuple projection.
 *
 *   Emits `Array<[tag, value]>` in source order (sorted by `start`). Preserves repeated tags (e.g.
 *   two `locality` entries for "Springfield, IL — sent from Springfield, MA"). Hierarchy is lost —
 *   use `decodeAsXML` when containment matters.
 */
import type { ComponentTag } from "../types/component.ts";
import type { AddressNode, AddressTree } from "./types.ts";
/**
 * Options for {@link decodeAsTuples}.
 */
export interface SerializeTuplesOpts {
    /**
     * Interleave `["unknown", value]` tuples for the all-O spans the model left unclassified (#493), in source order.
     * Default false — keeps the existing tag-only shape unless the caller asks for the gaps.
     */
    includeUnknown?: boolean;
}
/**
 * Recursively flattens an `AddressNode` tree into a source-ordered list of nodes.
 *
 * @param node The root node to flatten.
 * @param out The output array to which flattened nodes will be appended.
 */
export declare function flatten(node: AddressNode, out: AddressNode[]): void;
/**
 * Project an `AddressTree` to a source-ordered list of (tag, value) pairs.
 */
export declare function decodeAsTuples(tree: AddressTree): Array<[ComponentTag, string]>;
export declare function decodeAsTuples(tree: AddressTree, opts: SerializeTuplesOpts): Array<[ComponentTag | "unknown", string]>;
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