Unnecessary package.json required for use with Deno

[markmals]

I'm using React Router as a…

framework

Reproduction

Delete the package.json file from this template and run deno task dev: https://github.com/remix-run/react-router-templates/tree/main/deno

System Info

System:
    OS: macOS 15.5
    CPU: (10) arm64 Apple M4
    Memory: 111.78 MB / 32.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 22.16.0 - ~/.volta/tools/image/node/22.16.0/bin/node
    npm: 10.9.2 - ~/.volta/tools/image/node/22.16.0/bin/npm
    pnpm: 10.11.0 - ~/.volta/bin/pnpm
    bun: 1.2.15 - /opt/homebrew/bin/bun
  Browsers:
    Chrome: 137.0.7151.68
    Safari: 18.5

Used Package Manager

npm

Expected Behavior

• React Router should work in Deno environments without requiring a package.json file.
• Since Deno does not use package.json for dependency resolution, the code path that tries to load or reference package.json should be skipped when running under Deno (or replaced by a Deno-friendly entry point).

Actual Behavior

• Any calls to the react-router binary fail if no package.json is found.
• Users are forced to add an inert package.json with a comment field merely to satisfy @react-router/dev's import logic, which doesn’t make sense for Deno.

[markmals]

Related PR: #13744