type Reader = (datum: unknown) => unknown;
/**
 * Compiles a string accessor into a reader function.
 *
 * Flat keys return early with a direct property read. Nested paths are split
 * into their segments once, at build time, and the reader resolves against
 * those ready-made segments.
 * @internal
 */
export declare function makeAccessor(accessor: string): Reader;
export declare function makeAccessor(accessor?: string): Reader | undefined;
export {};
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