Exports order seems to matter

[elmerbulthuis]

Describe the bug

I have a dependency, it has the following exports in package.json:

  "exports": {
    ".": {
      "require": "./bundled/main.cjs",
      "import": "./bundled/main.js",
      "types": "./typed/main.d.ts",
      "browser": "./bundled/browser.js"
    }
  },

Vite always takes the import export. Now when I change this to:

  "exports": {
    ".": {
      "browser": "./bundled/browser.js",
      "import": "./bundled/main.js",
      "require": "./bundled/main.cjs",
      "types": "./typed/main.d.ts"
    }
  },

I get the desired and expected behavior, the browser export it used.

This is a bug, the order in which JSON fields are defined should not matter.

Reproduction

http://sorry.com

Steps to reproduce

No response

System Info

System:
    OS: Linux 6.6 Arch Linux
    CPU: (8) x64 Intel(R) Core(TM) i7-9700K CPU @ 3.60GHz
    Memory: 7.15 GB / 15.48 GB
    Container: Yes
    Shell: 5.2.37 - /usr/bin/bash
  Binaries:
    Node: 23.4.0 - /usr/bin/node
    npm: 11.0.0 - /usr/bin/npm
  Browsers:
    Chromium: 132.0.6834.83
  npmPackages:
    @vitejs/plugin-react-swc: ^3.7.2 => 3.7.2
    rollup: ^3.29.5 => 3.29.5
    vite: ^5.4.11 => 6.0.7

Used Package Manager

npm

Logs

No response

Validations

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• The provided reproduction is a minimal reproducible example of the bug.

[bluwy]

This behavior is written in the spec: https://nodejs.org/api/esm.html#:~:text=%20in%20object%20insertion%20order