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(). Use parseClassName() to turn the machine-readable class IDs on revived class-instance markers into display-friendly names.

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);