Vite config is evaluated twice in Remix dev mode

[kettanaito]

Reproduction

This is reproducible on any latest Remix project (sorry for not providing an exact repo, there is literally nothing specific to the app).

1. Open vite.config.ts.
2. Put a console.log(1) in the root scope of the module.
3. Run npm run dev.
4. See 1 being printed twice.

System Info

System info is irrelevant.

Used Package Manager

pnpm

Expected Behavior

Vite, its configuration and plugins are executed once.

Actual Behavior

Remix executes everything Vite-related twice. This makes it impossible to write proper Vite plugins as every hook in a plugin will be called twice.

Here are the two calls traced to see their stack traces:

Trace: 1
    at file://app/vite.config.ts.timestamp-1727182481040-668186ca07abb.mjs:25:9
    at ModuleJob.run (node:internal/modules/esm/module_job:218:25)
    at async ModuleLoader.import (node:internal/modules/esm/loader:329:24)
    at async loadConfigFromBundledFile (file:///app/node_modules/.pnpm/[email protected]_@[email protected]/node_modules/vite/dist/node/chunks/dep-DG6Lorbi.js:66633:15)
    at async loadConfigFromFile (file:///app/node_modules/.pnpm/[email protected]_@[email protected]/node_modules/vite/dist/node/chunks/dep-DG6Lorbi.js:66474:24)
    at async resolveConfig (file:///app/node_modules/.pnpm/[email protected]_@[email protected]/node_modules/vite/dist/node/chunks/dep-DG6Lorbi.js:66082:24)
    at async _createServer (file:///app/node_modules/.pnpm/[email protected]_@[email protected]/node_modules/vite/dist/node/chunks/dep-DG6Lorbi.js:62700:18)
    at async dev (/app/node_modules/.pnpm/@[email protected]_@[email protected]_@[email protected]_@[email protected][email protected][email protected]/node_modules/@remix-run/dev/dist/vite/dev.js:39:16)
    at async Object.viteDev (/app/node_modules/.pnpm/@[email protected]_@[email protected]_@[email protected]_@[email protected][email protected][email protected]/node_modules/@remix-run/dev/dist/cli/commands.js:220:3)
    at async Object.run (/app/node_modules/.pnpm/@[email protected]_@[email protected]_@[email protected]_@[email protected][email protected][email protected]/node_modules/@remix-run/dev/dist/cli/run.js:271:7)
    
Trace: 1
    at file://app/vite.config.ts.timestamp-1727182481241-1ed74236d2d8e.mjs:25:9
    at ModuleJob.run (node:internal/modules/esm/module_job:218:25)
    at async ModuleLoader.import (node:internal/modules/esm/loader:329:24)
    at async loadConfigFromBundledFile (file:///app/node_modules/.pnpm/[email protected]_@[email protected]/node_modules/vite/dist/node/chunks/dep-DG6Lorbi.js:66633:15)
    at async Module.loadConfigFromFile (file:///app/node_modules/.pnpm/[email protected]_@[email protected]/node_modules/vite/dist/node/chunks/dep-DG6Lorbi.js:66474:24)
    at async configResolved (/app/node_modules/.pnpm/@[email protected]_@[email protected]_@[email protected]_@[email protected][email protected][email protected]/node_modules/@remix-run/dev/dist/vite/plugin.js:727:37)
    at async Promise.all (index 1)
    at async resolveConfig (file:///app/node_modules/.pnpm/[email protected]_@[email protected]/node_modules/vite/dist/node/chunks/dep-DG6Lorbi.js:66346:3)
    at async _createServer (file:///app/node_modules/.pnpm/[email protected]_@[email protected]/node_modules/vite/dist/node/chunks/dep-DG6Lorbi.js:62700:18)
    at async dev (/app/node_modules/.pnpm/@[email protected]_@[email protected]_@[email protected]_@[email protected][email protected][email protected]/node_modules/@remix-run/dev/dist/vite/dev.js:39:16)

• The process.pid is the same across the two calls.
• The same behavior for .ts config format as well as .mjs.

The look quite identical to me. A bug, perhaps?