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What is synckit?

fisker/synckit — explained in plain English

Analysis updated 2026-07-18 · repo last pushed 2025-05-30

Audience · developerComplexity · 3/5StaleSetup · moderate

In one sentence

A Node.js tool that lets you run slow async operations (like fetching data or reading a file) as if they were instant, synchronous calls, using worker threads under the hood.

Mindmap

mindmap
  root((synckit))
    What it does
      Runs async as sync
      Uses worker threads
      Returns results immediately
    Tech Stack
      Node.js
      TypeScript
      Worker threads
    Use Cases
      Linters needing sync APIs
      Bundlers calling services
      Sync wrappers for async code
    Tradeoffs
      Faster than sync-threads
      Slower than native sync
      Results must be serializable

Code map

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filefunction / class

What do people build with it?

USE CASE 1

Build a linter that needs to call an async API but must return its result synchronously.

USE CASE 2

Wrap a slow file-read or network call so it behaves like a normal synchronous function call.

USE CASE 3

Bridge existing async utilities into tools that require a synchronous plugin interface.

What is it built with?

Node.jsTypeScriptWorker threadsYarn

How does it compare?

fisker/synckit0verflowme/alarm-clock0verflowme/seclists
Language—CSS—
Last pushed2025-05-302022-10-032020-05-03
MaintenanceStaleDormantDormant
Setup difficultymoderateeasyeasy
Complexity3/52/51/5
Audiencedevelopervibe coderops devops

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · moderate Time to first run · 30min

Requires writing a separate worker file plus a runner file to wire them together.

License is not stated in the available content.

Copy-paste prompts

Prompt 1
Show me how to use synckit to turn an async function into a synchronous one in my Node.js project.
Prompt 2
Write a synckit worker file that fetches data from an API, plus a runner file that calls it synchronously.
Prompt 3
Help me integrate synckit into my linter plugin so it can call an async service synchronously.
Prompt 4
Explain how synckit's worker-thread approach compares to sync-threads for my use case.

Frequently asked questions

What is synckit?

A Node.js tool that lets you run slow async operations (like fetching data or reading a file) as if they were instant, synchronous calls, using worker threads under the hood.

Is synckit actively maintained?

Stale — no commits in 1-2 years (last push 2025-05-30).

What license does synckit use?

License is not stated in the available content.

How hard is synckit to set up?

Setup difficulty is rated moderate, with roughly 30min to a first successful run.

Who is synckit for?

Mainly developer.

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