Elysia fails with TypeSystemPolicy not found in @sinclair/typebox/system when installed with Bun

[dheerajy1]

Question

Should @elysiajs/openapi explicitly depend on @sinclair/typebox@0.25.24 (or a compatible range) to avoid this issue with Bun dependency resolution?

Issue

I encountered a runtime error when installing Elysia with Bun. It appears to be related to a @sinclair/typebox peer dependency mismatch.

Environment

• Bun: 1.3.7
• Node: v20.19.4
• OS: Linux
• Elysia: 1.4.27
• OpenAPI plugin: 1.4.14

Installation

package.json

  "dependencies": {
    "@elysiajs/openapi": "^1.4.14",
    "@elysiajs/static": "^1.4.7",
    "elysia": "^1.4.22",
    "lucide-react": "^0.577.0",
    "mssql": "^12.2.0",
    "react": "^19.2.4",
    "react-dom": "^19.2.4",
    "vercel": "^50.28.0",
    "zod": "^4.3.6"
  },
  "devDependencies": {
    "@tailwindcss/cli": "^4.2.1",
    "@types/bun": "^1.3.10",
    "@types/mssql": "^9.1.9",
    "@types/react": "^19.2.14",
    "@types/react-dom": "^19.2.3",
    "@typescript-eslint/eslint-plugin": "^8.56.1",
    "@typescript-eslint/parser": "^8.56.1",
    "bun-types": "^1.3.10",
    "eslint": "^10.0.3",
    "tailwindcss": "^4.2.1",
    "tsc-alias": "^1.8.16",
    "typescript": "^5.9.3"
  },

Fresh install:

rm -rf node_modules bun.lock
bun install

install output in terminal

bun add elysia@latest @elysiajs/openapi@latest @elysiajs/static@latest
[0.04ms] ".env"
bun add v1.3.7 (ba426210)
warn: incorrect peer dependency "@sinclair/typebox@0.25.24"

installed elysia@1.4.27
installed @elysiajs/openapi@1.4.14
installed @elysiajs/static@1.4.7

3 packages installed [3.85s]

Bun shows a peer dependency warning:

warn: incorrect peer dependency "@sinclair/typebox@0.25.24"

Running dev server

bun dev

Output:

$ bunx tailwindcss -i ./src/tailwind.css -o ./public/global.css && bun --hot src/server.ts
≈ tailwindcss v4.2.1

Done in 90ms
1 | })
2 | {
    ^
SyntaxError: export 'TypeSystemPolicy' not found in '@sinclair/typebox/system'

Thank you in advance for the help.

[dheerajy1]

this worked Claude solved it

Root Cause Analysis

The conflict is between vercel and elysia:

• elysia requires @sinclair/typebox >= 0.34.0 (uses it internally)
• vercel pulls in @vercel/gatsby-plugin-vercel-builder which hard-pins @sinclair/typebox@0.25.24

These two versions are incompatible, causing:

SyntaxError: export 'TypeSystemPolicy' not found in '@sinclair/typebox/system'

Fix

Add overrides to your package.json:

{
  "overrides": {
    "@sinclair/typebox": "^0.34.0"
  }
}

Then:

rm -rf node_modules bun.lock && bun install

Why it works

overrides forces all packages including @vercel/gatsby-plugin-vercel-builder to use 0.34.x, which is what elysia needs. The vercel gatsby plugin is irrelevant in a bun+elysia project anyway.