/**
 * @module event-versions
 * @category Internal
 *
 * Auto-deprecation of legacy event versions via the `_v<digits>` naming
 * convention (ACT-403).
 *
 * Act's schema-evolution pattern keeps the old and new event names alive
 * forever — the old name on the read path (reducers), the new on the write
 * path (emissions). This module reads the convention to identify legacy
 * versions automatically; the framework then enforces "emit only the
 * current version" at build time and warns at runtime for dynamic emits.
 *
 * Convention pin: only `_v<digits>` with digits ≥ 2 counts as a version
 * suffix. `Foo_v1` is just a literal event name (the base `Foo` is
 * implicitly v1). Pinning here keeps the contract surface small.
 *
 * @internal
 */
/**
 * Returns the set of event names that are deprecated by virtue of having
 * a higher-numbered sibling in the registry. The highest version in each
 * group is the current version; every lower version is deprecated.
 *
 * Gaps are allowed: `{Foo, Foo_v3}` → `Foo` is deprecated, `Foo_v3` is
 * current. The framework picks the max regardless of contiguity.
 *
 * Single-version groups (no siblings) yield no deprecations.
 *
 * @internal
 */
export declare function deprecated_event_names(names: Iterable<string>): Set<string>;
/**
 * Given a deprecated event name and the full set of event names in its
 * registry, returns the current (highest-version) sibling. Used to build
 * actionable error messages — "use `Foo_v3` instead."
 *
 * Returns `undefined` if the event has no higher-versioned sibling (which
 * means the caller's classification is stale or wrong).
 *
 * @internal
 */
export declare function current_version_of(deprecated_name: string, all_names: Iterable<string>): string | undefined;
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