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Jaeyeol Lee

@kodingwarrior@hackers.pub · 667 following · 483 followers

Neovim Super villain. 풀스택 엔지니어 내지는 프로덕트 엔지니어라고 스스로를 소개하지만 사실상 잡부를 담당하는 사람. CLI 도구를 만드는 것에 관심이 많습니다.

Hackers' Pub에서는 자발적으로 바이럴을 담당하고 있는 사람. Hackers' Pub의 무궁무진한 발전 가능성을 믿습니다.

그 외에도 개발자 커뮤니티 생태계에 다양한 시도들을 합니다. 지금은 https://vim.kr / https://fedidev.kr 디스코드 운영 중

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wwj @z9mb1@hackers.pub
Public

트위터에도 썼지만, 최근에 퇴사한 동료에게서 제 긍정적임을 아주 높이 사고 세상에 저 같은 사람이 더 필요하다는 칭찬을 들었는데 아주 기분이 좋았습니다. 제 스킬에 대해선 그냥 괜찮다고만 했지만 😒😒 아무튼 냉소적으로 행동하지 않기 위해 한 노력이 인정 받은 듯한 느낌 🫶✌️

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Fedify: ActivityPub server framework @fedify@hollo.social
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Shared by Jaeyeol Lee

We're thrilled to announce Fedify 1.8.1, a mega release made possible through the incredible efforts of contributors from South Korea's (Open Source Contribution Academy). This release marks a significant milestone in 's development, bringing major architectural changes, new packages, and numerous enhancements across the board.

Note: Version 1.8.0 was skipped due to a versioning error.

🎉 Major Milestone: Monorepo Architecture

Fedify has been restructured as a , consolidating all packages into a single repository with unified versioning. This change streamlines development and ensures all packages are released together with consistent version numbers.

Consolidated Packages

All existing Fedify packages now live under one roof:

  • @fedify/fedify — Main library
  • @fedify/cli — CLI toolchain
  • @fedify/amqp — AMQP/RabbitMQ driver
  • @fedify/express — Express integration
  • @fedify/h3 — h3 framework integration
  • @fedify/postgres — PostgreSQL drivers
  • @fedify/redis — Redis drivers

🆕 New Packages

This release introduces four new packages to the Fedify ecosystem:

  • @fedify/elysia — Elysia integration for Bun-powered applications
  • @fedify/nestjs — NestJS integration for enterprise Node.js apps
  • @fedify/sqlite — SQLite driver compatible with Bun, Deno, and Node.js
  • @fedify/testing — Testing utilities with mock Federation and Context classes

@fedify/fedify

Custom Collection Dispatchers

A powerful new feature that allows you to create custom collections beyond the standard ActivityPub collections. This enables implementation of domain-specific collections while maintaining federation compatibility.

Contributors: ChanHaeng Lee [#310, #332]

  • Added comprehensive types and interfaces for custom collection handling
  • New methods on Federatable interface: setCollectionDispatcher() and setOrderedCollectionDispatcher()
  • Added getCollectionUri() method to the Context interface
  • Full support for paginated custom collections

Compare-and-Swap (CAS) Support for KV Stores

Key–value stores now optionally support CAS operations for atomic updates, enabling optimistic locking and preventing lost updates in concurrent environments.

  • Added optional KvStore.cas() method
  • Implemented in MemoryKvStore and DenoKvStore
  • Useful for implementing distributed locks and counters

Fediverse Handle Utilities

New utility functions make working with handles more convenient.

Contributors: ChanHaeng Lee [#278]

  • parseFediverseHandle() — Parse handles into components
  • isFediverseHandle() — Validate handle format
  • toAcctUrl() — Convert handles to URLs
  • FediverseHandle interface for type safety

Enhanced HTTP Request APIs

Contributors: Lee ByeongJun [#248, #281], Hyunchae Kim [#51, #315]

  • Added LookupWebFingerOptions.maxRedirection option for controlling redirect behavior
  • APIs now support AbortSignal for request cancellation
  • New DocumentLoaderOptions interface
  • Added signal options to LookupObjectOptions, LookupWebFingerOptions, and DoubleKnockOptions

@fedify/cli

New Commands and Enhancements

The CLI has received significant improvements thanks to our OSSCA contributors:

fedify webfinger Command

Contributors: ChanHaeng Lee [#260, #278], KeunHyeong Park [#311, #328]

Look up WebFinger information for any fediverse resource:

  • Supports handles (@user@server) and URLs
  • --user-agent option for custom User-Agent headers
  • --allow-private-address for local testing
  • --max-redirection to control redirect following

fedify nodeinfo Command

Contributors: Hyeonseo Kim [#267, #331, #168, #282, #304]

Replaces the deprecated fedify node command with improved terminal rendering.

Enhanced fedify lookup Command

Contributors: Jiwon Kwon [#169, #348, #261, #321]

  • Terminal-specific image display for Kitty, WezTerm, Konsole, Warp, Wayst, st, and iTerm
  • -o/--output option to save results to files

Improved fedify inbox Command

Contributors: Hasang Cho [#262, #285], Jang Hanarae [#191, #342]

  • --actor-name and --actor-summary options for customizing temporary actors
  • Now displays object types contained in activities

fedify init --dry-run

Contributors: Lee ByeongJun [#263, #298]

Preview project initialization without creating files.

Better Terminal Support

Contributors: Cho Hasang [#257, #341]

Correctly handles color output based on TTY detection and NO_COLOR environment variable.

@fedify/elysia

Contributors: Hyeonseo Kim [#286, #339]

New Elysia integration brings Fedify to Bun-powered applications with a simple plugin interface:

import { Elysia } from "elysia";
import { fedify } from "@fedify/elysia";

const app = new Elysia()
  .use(fedify(federation, { /* options */ }))
  .listen(3000);

@fedify/nestjs

Contributors: Jaeyeol Lee [#269, #309]

Enterprise-ready NestJS integration with dependency injection support:

import { FedifyModule } from "@fedify/nestjs";

@Module({
  imports: [
    FedifyModule.forRoot({
      kv: new MemoryKvStore(),
      queue: new InProcessMessageQueue(),
      origin: "https://example.com",
    }),
  ],
})
export class AppModule {}

@fedify/sqlite

Contributors: An Subin [#274, #318]

SqliteKvStore implementation compatible across all major JavaScript runtimes:

import { SqliteKvStore } from "@fedify/sqlite";

const kv = new SqliteKvStore("./fedify.db");

@fedify/testing

Contributors: Lee ByeongJun [#197, #283]

Comprehensive testing utilities with mocking support for Fedify applications:

import { MockFederation, MockContext } from "@fedify/testing";

const mockFederation = new MockFederation();
const mockContext = new MockContext();

// Track sent activities with full metadata
// Support custom path registration
// Multiple activity type listeners

🙏 Acknowledgments

This release represents an extraordinary community effort, particularly from the participants of South Korea's OSSCA (Open Source Contribution Academy) (Note: page in Korean). We extend our heartfelt thanks to all contributors:

Core Contributors

Test Infrastructure Contributors

Your contributions have made Fedify stronger and more versatile than ever. The OSSCA program's support has been instrumental in achieving this milestone release.

Migration Guide

Updating from Previous Versions

If you're using separate Fedify packages, update all packages to version 1.8.1:

{
  "dependencies": {
    "@fedify/fedify": "^1.8.1",
    "@fedify/cli": "^1.8.1",
    "@fedify/express": "^1.8.1"
  }
}

All packages now share the same version number, simplifying dependency management.

Breaking Changes

There are no breaking changes in this release. All existing code should continue to work without modifications.

What's Next

With the monorepo structure in place and new integrations available, we're excited to continue improving Fedify's developer experience and expanding its capabilities. Stay tuned for more updates, and thank you for being part of the Fedify community!

For detailed technical information about all changes, please refer to the full changelog.

Fedify is an open-source project that helps developers build federated server applications powered by ActivityPub. Join us on GitHub or Discord to contribute or get help!

Released on August 6, 2025. Note that 1.8.0 was skipped due to a mistake in the versioning. The repository has been restructured as a monorepo, consolidating all Fedify packages into a single re...

Release Fedify 1.8.1 · fedify-dev/fedify

Released on August 6, 2025. Note that 1.8.0 was skipped due to a mistake in the versioning. The repository has been restructured as a monorepo, consolidating all Fedify packages into a single re...

github.com · GitHub

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Jaeyeol Lee @kodingwarrior@hackers.pub
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ZelliJ는 Claude Code 여러개 돌리기에도 좋긴 한데, Fedify 기반의 서비스 만들기에도 괜찮은듯. 탭 여러개 띄워놓고 컨텍스트 스위칭하기보다는 ZelliJ로 화면 분할해놓고 한쪽은 로그 띄우고 한쪽은 fedify cli로 이것저것 테스트해보고

Fedify 기반의 앱을 만들면서 ZelliJ로 터미널 화면을 분할해서 쓰고 있다. 한쪽은 NestJS 서버 로그, 한쪽은 fedify cli 실행 화면
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Jaeyeol Lee @kodingwarrior@hackers.pub
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어쩔때는 Zed가 좋은 것 같은데, 어쩔 때는 Neovim이 좋음. 수제코딩할때 Zed랑 Neovim이랑 아등바등하게 괜찮은데, 빠릿빠릿하고 에디터 환경에 대한 제어권이 온전히 나에게 있는 것을 꼽자면 Neovim. 플러그인이 사실상 0인데, 있을 것들은 다 들어가 있고 수제로 코딩하는 맛이 타격감이 괜찮은건 Vim 모드가 가미된 Zed.... 프로젝트를 할 때는 Neovim을 주로 쓰기는 하지만, 학습할때는 Zed를 쓰는 빈도가 좀 있는 듯.

지금 만들고 있는 NestJS 기반의 연합우주 앱도 의도적으로 Zed로 수제코딩 하고 있음. 퐝션? 그런거 쓰지 마세요

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Fedify: ActivityPub server framework @fedify@hollo.social
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Shared by Jaeyeol Lee

We'd like to recognize some excellent contributions from our (Open Source Contribution Academy) participants who have been working on .

@gaebalgom개발곰 contributed PR #339, which introduces the @fedify/elysia package to provide Elysia integration for Fedify. This work addresses issue #286 by creating a plugin that enables developers using and to integrate Fedify's capabilities into their applications. The contribution includes the core integration module, documentation, examples, and proper monorepo configuration, making Fedify accessible to the Elysia community.

@r4bb1t submitted PR #315, implementing comprehensive AbortSignal support across multiple APIs to resolve issue #51. This contribution adds request cancellation capabilities not only to lookupWebFinger() but also to lookupObject(), DocumentLoader, and the HTTP signature authentication flow (doubleKnock()), allowing developers to properly handle timeouts and abort ongoing requests throughout the entire request chain. The implementation includes extensive test coverage for cancellation scenarios across all affected components and lays the groundwork for adding --timeout options to various CLI commands like fedify lookup, fedify webfinger, and fedify nodeinfo, making federated applications more robust and responsive.

@ooheundaoed addressed a testing infrastructure issue with PR #350, fixing a race condition in PostgreSQL message queue tests that was causing intermittent failures (issue #346). By adding explicit initialization before concurrent message queue listeners, this fix prevents table creation conflicts that were affecting test reliability, ensuring more consistent PR testing for all contributors.

@songbirds provided two test stability improvements with PR #344 and PR #347. The first PR adds skip guards to RedisKvStore tests as a workaround for a known Bun runtime issue, keeping the test suite functional while awaiting an upstream fix. The second PR resolves a race condition in the code generation process by randomizing output filenames, preventing conflicts during parallel test execution. These contributions help maintain a stable testing environment for the project.

Thank you all for your contributions to Fedify. Your work helps make federated social networking more accessible to developers.

Summary Make Fedify integration plugin for Elysia. Related Issue closes Elysia integration #286 Changes elysia directory Bun monorepo setting Build scripts for bun Move example to example dir...

Elysia integration by dodok8 · Pull Request #339 · fedify-dev/fedify

Summary Make Fedify integration plugin for Elysia. Related Issue closes Elysia integration #286 Changes elysia directory Bun monorepo setting Build scripts for bun Move example to example dir...

github.com · GitHub

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notJoon @joonnot@hackers.pub
Public

시간 날 때 언어 관련 툴링들을 어떻게 구현하는지에 대한 글을 써봐야겠다. 린터, 테스트 커버리지, 프로파일러, 디버거에 대해 써보고 싶지만 과연 나의 게으름이 잘 버텨줄지는 모르겠다

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OSTEP 독학 일지 - H.0.

Jaeyeol Lee @kodingwarrior@hackers.pub

6년 차 개발자가 기본기를 다지기 위해 OS 기초를 다시 공부하는 여정을 담은 글입니다. 저자는 신입 개발자 수준의 기본기를 갖추기 위해 OSTEP 교재를 선택하고, xv6 프로젝트를 통해 운영체제 동작 원리를 체화하고자 합니다. 이 글에서는 xv6 과제들을 단계별로 공략하며 겪는 우여곡절과 발견, 그리고 이를 통해 얻는 인사이트를 서사적으로 풀어낼 계획을 밝힙니다. 단순히 지식을 정리하는 것을 넘어, 독자에게 재미있는 스토리를 전달하고 기술 면접에도 도움이 될 만한 생생한 경험을 공유하고자 하는 저자의 의지가 돋보입니다. OSSCA 2025 멘토링 경험에서 영감을 받아 시작된 이 여정은, 개발자로서의 성장과 더불어 해커스펍 커뮤니티에도 기여하고자 하는 저자의 열정을 보여줍니다.

Read more →
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chewing_leopard @chewing_leopard@hackers.pub
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Shared by Jaeyeol Lee

바이브코딩의 순기능(?) 이라고 할까요? 이런게 있으면 편하지 않을까? 라고 생각했을 때 적당한 도구를 빠르게 쳐낼 수 있는게 매력인 것 같아요. 말 못알아듣고 무한루프 돌때는 좀 그렇지만...

제가 관전하고 있는 OS 스터디에서 서울대 커리큘럼을 주로 활용하는데, 거기에 맞춰서 카이스트 자료도 정리해놓고 이것저것 붙였습니다. 만들고 나니 기분이 좋네요!!

OSTEP Tracker의 강의 항목을 선택했을 때 나오는 화면. 왼쪽은 SNU, 오른쪽은 KAIST 자료로 이루어져 있습니다.OSTEP Tracker의 대시보드(진도 현황 표시)
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notJoon @joonnot@hackers.pub
Public

1.8 마일스톤 까지 얼마 안남아서 푸쉬 겸 이슈 남은거 있으면 좀 가져갈까 했는데, 다 할당되어 있어서 신경은 안써도 되겠군. 대시보드나 마저 만들어야지

fedify 1.8 마일스톤 51%
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Jaeyeol Lee @kodingwarrior@hackers.pub
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CLI 도구 만드는거에 진심이어서 CLI 도구 만드는게 비즈니스 모델인 회사가, 이걸로만 누적 600만 달러 이상을 투자 받았는데, CLI 코딩 에이전트 시장에 뛰어들었다??? 이건 생태계 교란종임...

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Simon Willison @simon@fedi.simonwillison.net
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Shared by Jaeyeol Lee

July has been a truly incredible month for LLM releases from China - Moonshot (Kimi K2), Z ai (GLM-4.5) and 5 new releases from Qwen

I think it's undeniable that the best available open weight models now come from the Chinese AI labs simonwillison.net/2025/Jul/30/

The best available open weight LLMs now come from China

Something that has become undeniable this month is that the best available open weight models now come from the Chinese AI labs. I continue to have a lot of love …

simonwillison.net · Simon Willison’s Weblog

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Jaeyeol Lee @kodingwarrior@hackers.pub
Public

아니 이게 뭐야 ㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋ

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