process.env.NODE_ENV in package.json is incorrectly replaced

[ambar]

Describe the bug

import {version} from '../package.json'

Reproduction

{
  "name": "mylib",
  "version": "0.0.0",
  "scripts": {
    "dev": "microbundle --define process.env.NODE_ENV='production'"
  }
}

System Info

System:
    OS: macOS 11.2.3
    CPU: (12) x64 Intel(R) Core(TM) i9-8950HK CPU @ 2.90GHz
    Memory: 231.29 MB / 16.00 GB
    Shell: 5.8 - /bin/zsh
  Binaries:
    Node: 12.20.1 - ~/.nvm/versions/node/v12.20.1/bin/node
    Yarn: 1.21.1 - /usr/local/bin/yarn
    npm: 6.14.10 - ~/.nvm/versions/node/v12.20.1/bin/npm
    Watchman: 4.9.0 - /usr/local/bin/watchman
  Browsers:
    Chrome: 91.0.4472.114
    Chrome Canary: 93.0.4568.0
    Firefox: 88.0.1
    Safari: 14.0.3
    Safari Technology Preview: 14.2

### Used Package Manager

yarn

### Logs

```shell
SyntaxError: Unexpected token (4:17)
    at Object.pp$4.raise (node_modules/vite/dist/node/chunks/dep-fc2895ac.js:41641:13)
    at Object.pp.unexpected (node_modules/vite/dist/node/chunks/dep-fc2895ac.js:39149:8)
    at Object.pp.expect (node_modules/vite/dist/node/chunks/dep-fc2895ac.js:39143:26)
    at Object.pp$3.parseObj (node_modules/vite/dist/node/chunks/dep-fc2895ac.js:41255:12)
    at Object.pp$3.parseExprAtom (node_modules/vite/dist/node/chunks/dep-fc2895ac.js:40994:17)
    at Object.pp$3.parseExprSubscripts (node_modules/vite/dist/node/chunks/dep-fc2895ac.js:40813:19)
    at Object.pp$3.parseMaybeUnary (node_modules/vite/dist/node/chunks/dep-fc2895ac.js:40779:17)
    at Object.parseMaybeUnary (node_modules/vite/dist/node/chunks/dep-fc2895ac.js:49616:29)
    at Object.pp$3.parseExprOps (node_modules/vite/dist/node/chunks/dep-fc2895ac.js:40712:19)
    at Object.pp$3.parseMaybeConditional (node_modules/vite/dist/node/chunks/dep-fc2895ac.js:40695:19)

### Validations

- [X] Follow our [Code of Conduct](https://github.com/vitejs/vite/blob/main/CODE_OF_CONDUCT.md)
- [X] Read the [Contributing Guidelines](https://github.com/vitejs/vite/blob/main/.github/contributing.md).
- [X] Read the [docs](https://vitejs.dev/guide).
- [X] Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
- [X] Make sure this is a Vite issue and not a framework-specific issue. For example, if it's a Vue SFC related bug, it should likely be reported to https://github.com/vuejs/vue-next instead.
- [X] Check that this is a concrete bug. For Q&A open a [GitHub Discussion](https://github.com/vitejs/vite/discussions) or join our [Discord Chat Server](https://chat.vitejs.dev/).

[ghost]

Try this

{
  "name": "mylib",
  "version": "0.0.0",
  "scripts": {
    "dev": "microbundle --define NODE_ENV=production"
  }
}

or this
https://vitejs.dev/guide/env-and-mode.html#modes

[ambar]

@web2033 That's inconvenient for testing env.

[bluwy]

This should be fixed since #5515. But leaving it open since there's an optimization opportunity to skip define for JSON files.