프로토타입 · 미리 보기: 공식 레지스트리의 모든 서버를 담고 있으며 30분마다 동기화해요. 리뷰와 계정 기능은 다음 단계에서 열려요.
PopNx MCPAI를 쓰는 사람을 위한 MCP 서버 · 쉬운 말로 설명해요

Whyts

제작자: musatoktas버전 0.8.10i★ –i내 컴퓨터에서 실행
레지스트리 이름io.github.musatoktas/whyts

설치

개요

제작자가 쓴 설명(영어 원문)

Find out why a TypeScript project is slow: measured analysis and before/after comparison.

PopNx MCP의 세 기둥

이 세 가지는 절대 하나의 점수로 합치지 않아요. 의견, 측정, 인기는 서로 다른 것이니까요.

할 수 있는 일

이 서버는 아직 쉬운 말로 된 요약을 쓰지 못했어요. 아래는 레지스트리에서 읽어 온 사실이에요.

  • 연결 방식: 내 컴퓨터에서 실행
  • 전송 방식: stdio
  • 카테고리: 개발자 도구

설치

쓰고 있는 AI 앱을 고른 다음 설정을 복사하세요.

설치하기 전에

  • 기본 점검: 1개 중 1개 통과
  • 내 컴퓨터에서 내 사용자 계정의 권한(파일, 네트워크, 앱)으로 실행돼요.
  • 레지스트리에 입력해야 할 키가 나와 있지 않아요.

필요한 것

  • npmNode.js 설치(npx 명령어용)

어떤 앱을 쓰세요?

위에서 앱을 고르세요. 기억해 두었다가 다음부터는 버튼에 “…에 설치”라고 표시해요.

Claude Desktop → Settings → Developer → Edit Config를 열고 claude_desktop_config.json에 이 내용을 붙여 넣으세요

{
  "mcpServers": {
    "whyts": {
      "command": "npx",
      "args": [
        "-y",
        "whyts-mcp"
      ]
    }
  }
}

터미널에서 이 명령어를 실행하세요

claude mcp add whyts -- npx -y whyts-mcp

Cursor에서 열기

또는 설정을 직접 복사하기

프로젝트의 .cursor/mcp.json 또는 ~/.cursor/mcp.json에 붙여 넣으세요

{
  "mcpServers": {
    "whyts": {
      "command": "npx",
      "args": [
        "-y",
        "whyts-mcp"
      ]
    }
  }
}

브라우저가 앱을 열지 물어본 다음, 앱이 설정을 보여 주고 확인을 요청해요. 키 값은 비워 두니 직접 입력하세요.

VS Code에서 열기

또는 설정을 직접 복사하기

프로젝트의 .vscode/mcp.json에 붙여 넣으세요

{
  "servers": {
    "whyts": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "whyts-mcp"
      ]
    }
  }
}

브라우저가 앱을 열지 물어본 다음, 앱이 설정을 보여 주고 확인을 요청해요. 키 값은 비워 두니 직접 입력하세요.

이 서버는 내 컴퓨터에서 실행되는데, ChatGPT는 인터넷에 있는 서버에만 연결할 수 있어요. 다른 앱을 고르세요.

선택한 앱은 이 기기의 쿠키에만 저장돼요. 계정은 필요 없어요.

이 설정은 제작자의 레지스트리 정보로 만들었어요. README와 다르면 README를 따르세요.

할 수 있는 일

내 컴퓨터에서 실행돼요. 설치하면 AI 앱에 도구 목록이 나타나요.

기본 점검i

누구나 볼 수 있는 정보를 점검했고, 코드는 읽지 않았어요. 해당하지 않는 항목은 개수에서 뺐어요. · 2026년 11월 7일 점검

  • ✓ 통과

    제작자와 저장소 일치

    레지스트리 이름이 GitHub 계정 musatoktas 기준으로 확인되었고, 이 계정이 저장소를 소유하고 있어요

  • … 아직 점검 안 함

    계속 관리되고 있음

    아직 GitHub에서 이 저장소를 읽어 오지 않았어요

  • … 아직 점검 안 함

    라이선스 있음

    아직 GitHub에서 이 저장소를 읽어 오지 않았어요

  • – 해당 없음

    엔드포인트 응답

    내 컴퓨터에서 실행되는 서버라 인터넷 엔드포인트가 없어요

  • – 해당 없음

    OAuth로 로그인

    내 컴퓨터에서 실행되며, 대신 로컬 설정을 사용해요

  • … 아직 점검 안 함

    도구 설명에 숨겨진 지시 없음

    내 컴퓨터에서 실행돼요. 도구 목록은 인터넷 엔드포인트가 있는 서버에서만 읽을 수 있어요

개발자 도구 카테고리의 다른 서버와 비교i

  • 이 카테고리의 다른 서버 4901개 중 0%보다 스타가 많아요
  • 이 카테고리의 다른 서버 4901개 중 71%보다 최근에 레지스트리에 공개됐어요
  • 기본 점검 결과가 이 카테고리의 다른 서버 4901개 중 100%와 같거나 더 좋아요

레지스트리에서 이 카테고리의 활성 서버 전체와 비교했어요. 스타는 게시자가 저장소를 소유한 경우에만 세요.

자주 묻는 질문

Whyts, 안전한가요?

해당하는 기본 점검 1개 중 1개를 통과했어요. 코드는 읽지 않았어요. 키나 토큰을 넣기 전에 서버가 어떤 권한을 요구하는지 확인하고, 꼭 필요한 권한만 있는 키를 쓰세요.

어떤 키나 코드가 필요한가요?

레지스트리에 필수 키가 나와 있지 않아요. 다만 처음 쓸 때 로그인을 요구하는 서버도 있어요.

내 컴퓨터에서 실행되나요, 클라우드에서 실행되나요?

내 컴퓨터에서 실행돼요. AI 앱이 필요할 때 실행하고, 데이터는 제작자의 서버를 거치지 않아요(서버 자체가 온라인 서비스를 호출하는 경우는 제외).

아직 관리되고 있나요?

GitHub 저장소는 마지막으로 – 변경됐고, 최신 버전(0.8.10)은 15일 전 레지스트리에 올라왔어요.

어떤 앱에서 쓸 수 있나요?

Claude Desktop, Claude Code, Cursor, VS Code처럼 MCP를 지원하는 앱에서 쓸 수 있어요. 내 컴퓨터에 Node.js도 있어야 해요.

대신 쓸 수 있는 건 뭐가 있나요?

같은 카테고리에는: GitHub, Desktop Commander, Cloudflare MCP

대안

같은 카테고리에서 다른 제작자가 만든 서버예요. 스타 순으로 정렬했어요.

카드 보는 법:★ GitHub 스타i세 기둥: 리뷰 · 점검 · 사용 정도i업데이트 = 최신 버전을 레지스트리에 공개한 날i

GitHub

제작자: github

Connect AI assistants to GitHub - manage repos, issues, PRs, and workflows through natural language.

컴퓨터 또는 클라우드★ 34,245MIT4일 전 업데이트
설치

Desktop Commander

제작자: wonderwhy-er

MCP server for terminal commands, file operations, and process management

내 컴퓨터에서 실행★ 10,225MIT16일 전 업데이트
설치

Cloudflare MCP

제작자: cloudflare

Cloudflare MCP servers

클라우드에서 실행★ 4,446Apache-2.014개월 전 업데이트
설치

제작자의 README

README 열기

제작자의 저장소에서 쓰인 그대로 가져왔어요. PopNx MCP가 검토하거나 보증한 내용이 아니에요. HTML, 이미지, 스크립트는 제거했어요. 링크를 누르면 이 사이트를 벗어나요.

whyts

Find out why your TypeScript project is slow.

A small CLI that turns compiler diagnostics, traces, and import relationships into evidence you can act on. It says where the check is slow, and for three known patterns it also says why and what to do. No account, API key, or LLM required.

npx whyts

Run it in the folder of your tsconfig.json. It runs the real compiler once and prints at most three actions. To prove that a type change helped, use npx whyts compare (see below). To give the same evidence to an AI coding agent, use claude mcp add --transport stdio whyts -- npx -y whyts-mcp.

Found with whyts: a 7.4 s type check that went to 0.06 s (TanStack Form) and vue-tsc going from 80 s to 0.56 s (Vue). See Real cases.

Try it

Requires Node.js 20+ and a TypeScript project with dependencies installed.

npx whyts --project .

For repeatable runs, pin a version: npx whyts@0.8.4 --project .

To run from a checkout:

git clone https://github.com/musatoktas/whyts.git

cd whyts npm ci --ignore-scripts npm run demo node src/cli.js --project /path/to/your/tsconfig.json

Diagnoses and remedies

By default, whyts prints at most three actions and one summary line. Each action has a pattern, a location, a short remedy and a link. The image above is a recorded run. Use --verbose for the full report.

whyts 0.8.5 · TypeScript 5.9.3 · repro-project/tsconfig.json
  1. [measured] Recursive type instantiation: DeepKeys Where: k.ts:4:17 TS2589 at this place: Type instantiation is excessively deep and possibly infinite. It hit the instantiation limit inside DeepKeysAndValuesImpl (../src/util-types.ts:151). DeepKeysAndValuesImpl refers to itself: DeepKeysAndValuesImpl -> DeepKeyAndValueArray -> DeepKeysAndValuesImpl. Type argument JsonData (k.ts:2): JsonData refers to itself. Fix: Stop the expansion of DeepKeysAndValuesImpl when it meets a type it already visited. Or add a depth limit to it. Check that the fix keeps the same results. Cost: 10082.6 ms, at most 98.8% of Check time (upper bound, not a saving) Docs: https://github.com/microsoft/TypeScript/wiki/Performance

Check 10.20s · Total 10.80s · 65 files · 1 compiler error · 2 findings in the full report. Use --verbose to see them.

Eight patterns have a remedy. Each one was seen in a real project before it was added.

PatternTrace evidenceRemedy
recursive-type-instantiationA TS2589 error and the instantiateType_DepthLimit events. whyts finds the type alias that owns the type parameters at the limit, a reference cycle by name between aliases, and a type argument that refers to itselfStop the expansion on a type that was visited, or add a depth limit
partial-constraintA TS2589 error at a type reference, and instantiateType_DepthLimit events inside a generic type. A type parameter of the referenced declaration has a constraint that gives that generic type fewer type arguments than it declares, so the omitted ones take their defaultsGive all type arguments in the constraint, for example any for each. If the constraint is in a dependency, tell its maintainers
instantiation-expressionA TS2589 error at a type reference to a type alias whose body is a conditional type, such as ReturnType or Parameters. A type argument is an instantiation expression (typeof f ), and the instantiateType_DepthLimit events are not inside that aliasWrite the conditional type in place, with the expression as the checked type. For ReturnType, the declared return type of f can be used instead
builder-chainA TS2589 error at the start of a chain of method calls, and instantiateType_DepthLimit events inside a class. The method called most often in the chain, followed back through variables, takes and returns that class, and is called at least 32 timesBuild the calls as separate values of at most 32 calls each, and join them with the same method. Cutting the chain into variables does not help
nested-declarationA TS2589 error at a type or at the name of a declaration, and instantiateType_DepthLimit events inside a generic type. Through type aliases, interfaces and typeof, the type reaches a value whose written type in a declaration file nests that generic type at least 8 levels deepWrite the data type by hand as named interfaces, and annotate the value in its source with a type that names them. If the declaration is in a dependency, tell its maintainers
callback-inferenceA check chain whose focus is a call that took 200 ms or more, and recorded type comparisons and nested checks cover at most 25% of it. The trace has no event for type argument inference. The call gives no type arguments, a generic declaration of the callee has a parameter whose type uses its type parameters, and the argument for it is a function with its own type: a name of a function, or a function whose parameters all have typesIn the declaration, wrap the whole parameter type (for a rest parameter, its element type) in NoInfer<...> (TypeScript 5.4 or later). At the call site, give the type argument, or pass an arrow function without parameter types. If the declaration is in a dependency, tell its maintainers
variance-computationgetVariancesWorker events with the type id, the number of type parameters and the result. whyts reports the outermost events, the largest nested ones, and their union timeReduce type parameters, simplify return types. An in or out annotation is not a guaranteed fix
program-loadThe program is big, and the check is not. The compiler counters (Total time, Check time, Memory used, parse and bind time) and the import graph. whyts reports the files from node_modules, the largest packages, the file that brings most of them, and the typeof import() references that bring themUse a narrower entry point, or ask the maintainers of the package to move the references to an opt-in entry point. skipLibCheck does not help: it skips checking, not loading

A program-load action looks like this (vuetify 4.2.4, a project that only has import { createVuetify } from "vuetify"; the lines are shortened):

1. [measured] Program load: 421 dependency files, vuetify has 407; Check time is 0.01s of 4.22s

Where: ../node_modules/vuetify/lib/framework.d.ts:1:1 The program has 480 files: 421 in node_modules (13.8 MB of source), 58 compiler library files and 1 of your own. ... Memory used 577 MB in the traced run. Largest packages by files: vuetify 407 (12 MB), @vuetify/v0 3 (0 MB), vue 2 (0 MB), ... 409 of them (11.9 MB) come only through 218 typeof import() type references in ../node_modules/vuetify/lib/framework.d.ts, to ../node_modules/vuetify/lib/components/index.d.ts (192), ... Shortest import chain: index.ts -> ../node_modules/vuetify/lib/framework.d.ts -> ../node_modules/vuetify/lib/components/index.d.ts Fix: Each typeof import() reference in ... loads its target for every project that imports the package. Ask the maintainers to move them to an opt-in entry point. skipLibCheck skips checking these files, not loading them. ...

Rules:

  • A diagnosis is measured when the compiler recorded it (the error or the trace events). The name-based walk over type aliases is syntax only: it can miss a cycle that runs through imports it cannot match by name, or through a type that is not a declaration of the program.
  • The variance pattern needs 100 ms of union time in total, and only events of 50 ms or more count. It lists only types declared in the project. A type from a dependency gets no remedy, because the project cannot change it.
  • The cost is the largest recorded interval for the place, shown as at most N% of Check time. It is an upper bound under tracing. It is not a predicted saving.
  • In the compact report, a slow check without a known pattern shows only above 3% of Check time. A check that a diagnosis already explains by type name is not listed twice.
  • The trace events exist in TypeScript 5.9, 6.0 and 7.0 (instantiateType_DepthLimit, getVariancesWorker). In TypeScript 7 they carry a checkerId, and whyts uses one checker, so the type ids stay unique.
  • The program-load pattern needs all of these: 200 files or more from node_modules, a Total time of 1 s or more, a Check time of at most 1 s and at most 10% of the Total time, and one file that alone brings 100 files or more (and 25% of the dependency files). The compiler library files and your own files do not count as dependency files. A project with a normal amount of its own code has a larger Check time and does not match. The counters come from the traced run, where Memory used is higher than in a plain run.
  • program-load is a measurement of the program, not of the check. It does not say that removing the files makes the check faster: the check time of such a program is already small. It reads typeof import('pkg') in declaration files as an import. A file that is also brought by a regular import is not counted as brought only by those references.
  • callback-inference is a match of the call shape and of the time that the trace does not explain. The trace has no event for inference, so whyts does not prove that inference is the cost. It reads only the syntax of the callee declarations and of the argument. It does not know which overload the compiler chose. A type parameter that is wrapped in NoInfer deep inside the parameter type still matches: in telegraf (#2016), that form did not change the time, and NoInfer around the whole element type did.
  • Remedies are short instructions. They name a direction. whyts did not measure any remedy on your project.

Real cases

whyts found the place in each case below. The tRPC fix is merged. The other fixes are open pull requests in those projects, so they are proposals until the maintainers merge them. The Vuetify row is a measurement in an issue, with no fix. Each number comes from my own measurement on the stated compiler version.

ProjectWhat whyts foundResult
tRPC (#6997)TS2589 in Serialize (serialize.ts:35) when the type contains a recursive JSON type such as Prisma.JsonValueA fix in PR #7660, merged on 2026-10-19. The repro had TS2589 on main and has no error with the fix. Instantiations went from 89,700 to 78,502. The type-check time of packages/server did not change (within noise)
TanStack Form (#1474)TS2589 in DeepKeys: the type alias refers to itself through DeepKeyAndValueArrayA fix in PR #2422. Check time of the repro went from 7.4 s to 0.06 s (whyts compare, 10 runs, separated). form-core stayed within noise
TypeORM (#8559)TS2589 in QueryDeepPartialEntity (QueryPartialEntity.ts:17) for types that contain themselvesA fix in PR #12943. whyts reports the diagnosis before the change and reports none after it

| Vue (#14323) | defineModel with a defineEmits call signature that ends in void makes OverloadUnionRecursive (@vue/shared) run to the depth limit. It is 100% of the Check time | A fix in [PR #15851](https://githu

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