/**
 * Pure `indexByName` / `findByName` helpers for projection rows carrying an
 * `ExtensionKey`. Exported once from this shared utility; per-subject modules
 * re-use the same shape so command handlers can lookup a row by name without
 * each subject re-implementing the operation.
 *
 * Rows are read-only inputs; the helpers do not mutate or copy beyond what is
 * needed to build a `Map`. First-seen wins on duplicate names — duplicates are
 * rare in projection output (the projection helper deduplicates by name) but
 * the contract is explicit.
 */
import * as Option from "effect/Option";
import type { ExtensionKey } from "../types.js";
/**
 * Minimal row shape the helpers operate on. Subjects whose row carries
 * `key: ExtensionKey<TType>` for any `TType` satisfies this constraint.
 */
export interface RowWithKey {
    readonly key: ExtensionKey;
}
/**
 * Build a name-indexed read-only map from a row array. First row with a given
 * `key.name` wins; subsequent rows with the same name are dropped.
 */
export declare const indexByName: <Row extends RowWithKey>(rows: ReadonlyArray<Row>) => ReadonlyMap<string, Row>;
/**
 * Look up one row by name. Returns `Option.none()` when the name is not
 * indexed.
 */
export declare const findByName: <Row extends RowWithKey>(rows: ReadonlyArray<Row>, name: string) => Option.Option<Row>;
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