/**
 * Common event base — every wa-agent event carries `v`, `ts`, `traceId`,
 * and optionally `tenantId` so multi-tenant SaaS bots can sample/index by
 * tenant in Analytics Engine.
 *
 * Versioned schema: every payload is `{ v: 1, ts, traceId, tenantId?, type, ... }`.
 * Bump `v` when you change a field's meaning in a backwards-incompatible way.
 */
import { z } from 'zod';
export declare const BaseEventFields: {
    v: z.ZodLiteral<1>;
    ts: z.ZodString;
    traceId: z.ZodString;
    tenantId: z.ZodOptional<z.ZodString>;
};
export type EventInputBase = {
    traceId?: string;
    tenantId?: string;
};
/**
 * Stamp `v`, `ts`, and `traceId` (auto-generated if absent) onto a partial
 * event. The full event then gets `safeParse`'d before write — keeping the
 * "fill in framework fields, validate, write" pipeline in one place.
 */
export declare function stampBase<T extends EventInputBase>(input: T): T & {
    v: 1;
    ts: string;
    traceId: string;
};
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