export type TransformChannel = "message" | "wire";
/**
 * Pick the transform channel: an explicit preference always wins; otherwise
 * the wire channel is used only when the caller's host actually applies the
 * wire-payload replacement (adapters pass `wireViable` — e.g. the body format
 * is in WIRE_FORMATS and the host honors the hook's return value).
 */
export declare function resolveTransformChannel(explicit: TransformChannel | undefined, wireViable: boolean): TransformChannel;
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