[bug] Parcel 2.9 is incompatible with Ant Design 5

[TechQuery]

🎛 Configuration

package.json

{
  "dependencies": {
    "@ant-design/cssinjs": "^1.10.1",
    "@ant-design/icons": "^5.1.4",
    "antd": "^5.6.1",
    "browser-unhandled-rejection": "^1.0.2",
    "koajax": "^0.8.4",
    "lodash": "^4.17.21",
    "mobx": "^5.15.7",
    "mobx-i18n": "^0.3.15",
    "mobx-react": "^6.3.1",
    "mobx-restful": "^0.6.5",
    "mobx-restful-table": "^1.0.2",
    "react": "^17.0.2",
    "react-dom": "^17.0.2",
    "react-router": "^6.12.0",
    "react-router-class-tools": "^0.1.3",
    "react-router-dom": "^6.12.0",
    "web-utility": "^4.0.0"
  },
  "devDependencies": {
    "@octokit/openapi-types": "^17.2.0",
    "@parcel/packager-raw-url": "~2.9.1",
    "@parcel/transformer-webmanifest": "~2.9.1",
    "@types/lodash": "^4.14.195",
    "@types/node": "^16.18.34",
    "@types/react": "^17.0.60",
    "@types/react-dom": "^17.0.20",
    "husky": "^8.0.3",
    "lint-staged": "^13.2.2",
    "parcel": "~2.9.1",
    "prettier": "^2.8.8",
    "process": "^0.11.10",
    "typescript": "~5.1.3",
    "workbox-cli": "^7.0.0"
  },
  "scripts": {
    "start": "parcel src/index.html --open",
    "pack": "parcel build src/index.html --public-url .",
    "build": "rm -rf dist/  &&  npm run pack  &&  workbox generateSW"
  }
}

tsconfig.json

{
  "compilerOptions": {
    "target": "ES6",
    "module": "ES2020",
    "moduleResolution": "Node",
    "allowSyntheticDefaultImports": true,
    "experimentalDecorators": true,
    "jsx": "react-jsx",
    "lib": ["ES2020", "DOM"]
  }
}

🤔 Expected Behavior

Build Ant Design 5 projects successfully.

😯 Current Behavior

1. Dev mode works well.
2. Build mode failed with the error shown below:

> parcel build src/index.html --public-url .

🚨 Build failed.

@parcel/optimizer-swc: cannot reassign to a variable declared with `const`

    23333 | $parcel$export($d17d0f546e850da0$exports, "defaultPrefixCls", () => $d17d0f546e850da0$export$e4ec87ea71
  > 23334 | 
  >       | ^
    23335 | $parcel$export($d17d0f546e850da0$exports, "default", () => $d17d0f546e850da0$export$2e2bcd8739ae039);
    23336 | $parcel$export($d17d0f546e850da0$exports, "ConfigConsumer", () => $d17d0f546e850da0$re_export$ConfigCon

💁 Possible Solution

If I downgrade to Parcel 2.8.3, this bug disappeared.

💻 Code Sample

idea2app/React-MobX-Ant-Design-ts@7da1093

🌍 Your Environment

Software	Version(s)
Parcel	2.9.1
Node	16.20.0
PNPM	8.6.1
Operating System	Windows 10 Pro 22H2

[Zillionr]

I also have the same issue. I am using javascript instead of typescript. Please provide a solution.

[aamiriqubal]

I am also facing the same problem. Request you to kindly fix the problem.
Node version v18.16.0
antd v5.6.2
Parcel v2.9.2
Mac os ventura 13.4

[doronrosenberg]

Here is a minimal reproduction: https://github.com/doronrosenberg/-parcel-antd

❯ parcel-antd (main) ✘ npx parcel build  index.html
🚨 Build failed.

@parcel/optimizer-swc: cannot reassign to a variable declared with `const`

    9916 |
  > 9917 |
  >      | ^
    9918 | var $7ed5e10e08c170f8$exports = {};
    9919 |

[jotoh98]

Updating my .parcelrc worked. For now I'm falling back to the esbuild optimizer:

//.parcelrc
{
...
  "optimizers": {
      "*.js": ["@parcel/optimizer-esbuild"]
  }
}

[maximgeerinck]

This is also blocking our project, resolving the swc/core package to latest version didn't change anything either

[eugene-khyst]

Are there any updates?
In Parcel 2.9.3 + Antd 5.9.3 the issue is still present.

[aamiriqubal]

Unfortunately/Fortunately I ended up ditching parcel and using esbuild. It needed some work but it was worth ditching parcel as now the build time is faster and the build size also decreased.

[rsshilli]

I'm not even using Antd and I have this problem :-(.

@parcel/optimizer-swc: cannot reassign to a variable declared with `const`

    7000 |
  > 7001 |
  >      | ^
    7002 | parcelRegister("2QHqB", function(module, exports) {
    7003 |

It's particularly rough because I have no idea how to debug this. What file of mine is even causing this? parcelRegister doesn't exist anywhere in my code base.

[eugene-khyst]

With Parcel 2.12.0 and Antd 5.14.2 the issue is resolved.
No need to need to switch to esbuild optimizer anymore.