observabilityRevivers

A set of reviver functions that handle the workflow serialization format's workflow-specific types (streams, step/workflow function references, class instances, AbortController/AbortSignal, and DOMException), reviving them as display-friendly marker objects or strings. Built-in JavaScript types (Date, Map, Set, RegExp, etc.) are handled by the devalue format itself and need no revivers.

Pass it as the revivers argument to hydrateResourceIO() or hydrateData().

import { hydrateResourceIO, observabilityRevivers } from "workflow/observability";
import type { Step } from "@workflow/world";
declare const step: Step; // @setup

const hydrated = hydrateResourceIO(step, observabilityRevivers);

API signature

import type { Revivers } from "workflow/observability";

declare const observabilityRevivers: Revivers;

Where Revivers is:

type Revivers = Record<string, (value: any) => any>;

Each key is a serialized type tag, and each function revives a serialized value of that type. You can spread observabilityRevivers into a custom reviver map to override how specific types are displayed:

import { hydrateData, observabilityRevivers } from "workflow/observability";
declare const value: unknown; // @setup

const customRevivers = {
  ...observabilityRevivers,
  // Render stream references as plain strings instead of marker objects
  ReadableStream: () => "<stream>",
};

const hydrated = hydrateData(value, customRevivers);