reactor

library13.0.4jsnpmunverified

A work queue that pivots events to error-first callbacks. Version 13.0.4 provides an asynchronous task queue library for Node.js, allowing developers to define and run tasks with error-first callbacks. It offers a flexible and efficient way to manage work queues, similar to Cadence. The library is maintained and follows a regular release cadence. Unlike other task queues, reactor focuses on converting event-driven flows into callback-based patterns, making it suitable for scenarios like batch processing or workflow orchestration with explicit error handling.

productivity

npm install reactor

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INSTALL

IMPORT

SIG · REACTOR

reactor

productivityjavascriptv13.0.4

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

Reactor

✓ import { Reactor } from 'reactor'

✗ const Reactor = require('reactor')

ESM-only; if using CommonJS, use dynamic import or ensure Node.js version supports it.

createReactor

✓ import { createReactor } from 'reactor'

✗ const { createReactor } = require('reactor')

ESM-only; default export is not available, use named import.

ReactorTask

✓ import { ReactorTask } from 'reactor'

✗ import ReactorTask from 'reactor'

ReactorTask is a named export, not a default export.

Demonstrates creating a reactor work queue with a simple task that logs a message and handles completion or error via a callback.

import { createReactor } from 'reactor'; import { cadence } from 'cadence'; const work = createReactor(function (step) { step(function (step) { step(console.log, 'Hello, world!'); step(); }); }); work(function (error) { if (error) console.error(error); else console.log('Complete'); });

Debug

Known issues

breakingVersion 13.x dropped CommonJS support; all imports must use ESM syntax.

fix

Convert require() calls to import statements; use dynamic import if necessary.

affects: >=13.0.0

deprecatedThe default export 'Reactor' is deprecated as of v13; use named 'createReactor' instead.

fix

Replace 'new Reactor()' with 'createReactor()'.

affects: >=13.0.0

gotchaMissing 'cadence' peer dependency causes runtime errors; it must be installed separately.

fix

Install cadence: npm install cadence

affects: >=13.0.0

gotchaReactor tasks must always call step() to advance the queue; forgetting to invoke step() causes hangs.

fix

Ensure step() is called exactly once per callback to continue the workflow.

affects: >=1.0.0

Errors

Common errors & fixes

Error: Cannot find module 'cadence'

Cadence peer dependency not installed.

fix

npm install cadence

TypeError: Reactor is not a constructor

Using deprecated default export 'Reactor' in v13.0.4.

fix

Use 'createReactor' named import.

SyntaxError: Cannot use import statement outside a module

Running ESM import in a CommonJS project without proper configuration.

fix

Add "type": "module" to package.json or rename file to .mjs.

Upgrade

Version history

13.0.4latest on npm

Audit

Dependencies

cadencerequiredCore dependency for asynchronous control flow management

Agent activity

26 hits · last 30 days

node

OpenAI (training)

Resources

githubhttps://github.com/bigeasy/reactor ↗

packagereactor ↗

homepagehttp://bigeasy.github.com/reactor ↗