/**
 * A pluggable transform handler: `(value, fields, config) => result`. Same call shape as the built-in
 * transforms, so a plugin is indistinguishable from a built-in at the call site.
 */
export type FieldTransformPlugin = (value: unknown, fields: Record<string, unknown>, config: unknown) => unknown;
/**
 * Registers a transform plugin by type name so the {@link FieldTransformEngine} can dispatch a
 * non-built-in transform to it.
 *
 * This is how heavier transforms (e.g. `jsonpath`, `xpath`) are added WITHOUT making their libraries
 * (jsonpath-plus, xpath, @xmldom/xmldom, …) dependencies of this foundational package: a separate
 * package owns the libs, implements the handler, and calls this at module-load to register it. Any
 * `FieldTransformEngine` in the process (integration sync, rules-based bulk update, …) then supports the
 * transform — the engine stays lib-free, the plugin owns the deps. Idempotent per type (last wins).
 *
 * @param type - The transform `Type` string (case-insensitive), e.g. `'jsonpath'`.
 * @param plugin - The handler.
 */
export declare function RegisterFieldTransform(type: string, plugin: FieldTransformPlugin): void;
/** Returns the registered plugin for a transform type, or `undefined` if none is registered. */
export declare function GetFieldTransform(type: string): FieldTransformPlugin | undefined;
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