/**
 * Deprecation warnings — log each unique deprecation exactly once.
 *
 * Used internally when an API is renamed or about to be removed. Library
 * authors building on JORVEL can use the same helper to manage their own
 * deprecations.
 *
 * The default sink uses `console.warn`. The default global pin makes warnings
 * deduplicate across host + remotes even when the runtime is bundled twice.
 */
export interface DeprecationOptions {
    /** Stable key used for once-per-key deduplication. Default: the message itself. */
    key?: string;
    /** Version when the API was deprecated. */
    since?: string;
    /** Version when the API will be removed. */
    removeIn?: string;
    /** Replacement API to suggest. */
    replacement?: string;
    /** Override the sink (default: `console.warn`). */
    sink?: (message: string) => void;
}
export declare function deprecate(message: string, opts?: DeprecationOptions): void;
/**
 * Wrap a function so that calling it emits a one-time deprecation warning.
 * The wrapper preserves arity and `this` binding.
 */
export declare function markDeprecated<T extends (...args: never[]) => unknown>(fn: T, message: string, opts?: DeprecationOptions): T;
/** @internal — clears the dedupe set. Tests only. */
export declare function _resetDeprecations(): void;
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