Root tsconfig.json is used in addition to tsConfigPaths

[TrevorBurnham]

Which project does this relate to?

Start

Describe the bug

I'm trying to add TanStack Start to an existing project where the root tsconfig.json declares

"target": "ES2023",

That causes vinxi to emit a warning when starting the dev server:

vinxi v0.5.3
▲ [WARNING] Unrecognized target environment "ES2023" [tsconfig.json]

    tsconfig.json:13:14:
      13 │     "target": "ES2023",
         ╵               ~~~~~~~~

"No problem," I figured, "I'll just create a different tsconfig.json and update my app.config.ts to point to it":

// in app.config.ts
export default defineConfig({
  vite: {
    plugins: [
      tsConfigPaths({
        projects: ['./app/tsconfig.json'],
      }),
    ],
  },
})

However, after setting up that app/tsconfig.json, I still get the same warning, which references the root tsconfig.json.

I thought this might be because the root tsconfig.json is still used for app.config.ts itself, but I observe the same behavior if I change it to app.config.js. Additionally, I notice that changing either tsconfig.json or app/tsconfig.json triggers a dev server restart.

Your Example Website or App

https://codesandbox.io/p/devbox/modern-shape-48wcmm?file=%2Fapp.config.ts

Steps to Reproduce the Bug or Issue

Use the CodeSandbox above, or recreate it with these steps:

1. Fork the TanStack Start Basic example.
2. Copy the root tsconfig.json into the src/ dir.
3. Modify the tsConfigPaths options in app.config.ts to point to ./src/tsconfig.json.
4. In the root tsconfig.json, change target to "ES2023".

Expected behavior

When tsConfigPaths references a non-root tsconfig file, I expect the root tsconfig.json to be irrelevant.

Screenshots or Videos

No response

Platform

Observed on both my Mac and the CodeSandbox. Here are the dependency versions:

"dependencies": {
  "@tanstack/react-router": "^1.114.17",
  "@tanstack/react-router-devtools": "^1.114.21",
  "@tanstack/react-start": "^1.114.19",
  "react": "^19.0.0",
  "react-dom": "^19.0.0",
  "redaxios": "^0.5.1",
  "tailwind-merge": "^2.6.0",
  "vinxi": "0.5.3"
},
"devDependencies": {
  "@types/node": "^22.5.4",
  "@types/react": "^19.0.8",
  "@types/react-dom": "^19.0.3",
  "postcss": "^8.5.1",
  "autoprefixer": "^10.4.20",
  "tailwindcss": "^3.4.17",
  "typescript": "^5.7.2",
  "vite-tsconfig-paths": "^5.1.4"
}

Additional context

No response

[SeanCassiere]

This warning is likely being thrown by the older version of esbuild that's in Vinxi's dependencies.

Testing this with the target set to "ES2023" and with it also being included in the "lib" option of tsconfig.json in the "devinxi" branch does not yield this warning.