/**
 * Graph Execution Engine v2 — Thenable Predicate
 *
 * Version: 2.0
 * Date: 2026-09-18
 *
 * A seam that accepts "a listener whose result may or may not be awaited"
 * declares `void | Promise<unknown>`; the consumer has to decide at runtime
 * whether the returned value can be awaited. This predicate is that decision,
 * in one place — replacing the `as unknown` + `as PromiseLike<unknown>` probes
 * the callbacks used to need.
 *
 * Dependency-free on purpose: the modules that use it are the ones that would
 * otherwise form an import cycle.
 */
/**
 * Whether `v` can be awaited — a non-null object or function whose `then` is a
 * function.
 *
 * Only `then` matters, which is the same check `Promise.resolve` makes, so a
 * value accepted here is safe to hand to it. Primitives answer `false` without
 * a property lookup (the `in` test would throw on them).
 */
export declare function isThenable(v: unknown): v is PromiseLike<unknown>;
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