🐛 bug report

I have usual react project with webpack, babel@7, postcss@7 etc. And I tries to use parcel now. Parcel@1 is working good. But parcel@next show misterious error (see below).

1. I found, that fn(...args, function (err, ...re is from @parcel/utils/lib/promisify.js:4:17
2. Next I added more useful stacktrace using console.error(new Error("i'm here")) in lib/promisify.js (see below original error)
3. I had not found any 'could not be cloned' in node_modules, so looks it comes from Node.js. DOMException says about it too.

❯ parcel build src/index.jsx
DOMException [DataCloneError]: function (...args) {
    return new Promise(function (resolve, reject) {
      fn(...args, function (err, ...re...<omitted>... } could not be cloned.
    at Worker.postMessage (internal/worker.js:223:23)
    at ThreadsWorker.send (/Users/mxtnr/rocket/felix/front/node_modules/@parcel/core/node_modules/@parcel/workers/lib/threads/ThreadsWorker.js:62:17)
    at Worker.send (/Users/mxtnr/rocket/felix/front/node_modules/@parcel/core/node_modules/@parcel/workers/lib/Worker.js:81:17)
    at Worker.call (/Users/mxtnr/rocket/felix/front/node_modules/@parcel/core/node_modules/@parcel/workers/lib/Worker.js:91:10)
    at WorkerFarm.processQueue (/Users/mxtnr/rocket/felix/front/node_modules/@parcel/core/node_modules/@parcel/workers/lib/WorkerFarm.js:225:16)
    at Worker.<anonymous> (/Users/mxtnr/rocket/felix/front/node_modules/@parcel/core/node_modules/@parcel/workers/lib/WorkerFarm.js:182:35)
    at Worker.emit (events.js:210:5)
    at Worker.fork (/Users/mxtnr/rocket/felix/front/node_modules/@parcel/core/node_modules/@parcel/workers/lib/Worker.js:77:10)

useful stacktrace:

    at module.exports (/Users/mxtnr/rocket/felix/front/node_modules/parcel/node_modules/@parcel/utils/lib/promisify.js:4:17)
    at new NodeFS (/Users/mxtnr/rocket/felix/front/node_modules/parcel/node_modules/@parcel/fs/lib/NodeFS.js:48:58)
    at Command.run (/Users/mxtnr/rocket/felix/front/node_modules/parcel/lib/cli.js:97:63)
    at Command.listener (/Users/mxtnr/rocket/felix/front/node_modules/commander/index.js:315:8)
    at Command.emit (events.js:210:5)
    at Command.parseArgs (/Users/mxtnr/rocket/felix/front/node_modules/commander/index.js:654:12)
    at Command.parse (/Users/mxtnr/rocket/felix/front/node_modules/commander/index.js:474:21)
    at Object.<anonymous> (/Users/mxtnr/rocket/felix/front/node_modules/parcel/lib/cli.js:85:9)
    at Module._compile (internal/modules/cjs/loader.js:956:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:973:10)

🎛 Configuration

Ok, I attached my configs, by parcel fails before it read any of them. When I install parcel into empty directory all going perfect.

{
      "plugins": [],
      "presets": [
        ["@babel/env", {
          "targets": {
          },
          "modules":     false,
          "useBuiltIns": false,
          "loose":       true
        }],
      ]
}

{
  "name": "front",
  "version": "0.0.0",
  "main": "src/index.jsx",
  "dependencies": {
    "react": "^16.11.0",
  },
  "devDependencies": {
    "@babel/cli": "^7.5.5",
    "@babel/core": "^7.5.5",
    "@babel/preset-env": "^7.5.5",
    "parcel": "^2.0.0-alpha.3.2",
    "postcss-modules": "^1.4.1",
  },
  "alias": {
    "src": "./src",
    "utils": "./src/utils",
    "components": "./src/components",
    "public": "./src/public",
    "layouts": "./src/layouts",
    "actions": "./src/actions",
    "containers": "./src/containers",
    "pages": "./src/pages",
    "reducers": "./src/reducers",
    "widgets": "./src/widgets"
  },

{
  "modules": true,
  "plugins": {
    "postcss-import": {},
    "postcss-preset-env":  {
      "features": {},
      "autoprefixer": {
        "flexbox": false,
      }
    },
    "postcss-nested": {}
  },
  "sourceMap": true,
}

last 2 Chrome version
last 1 Safari version

💁 Possible Solution

Looks like parcel tried to send function via PostMessage…

💻 Code Sample

it’s no matter, parcel fails before it can read any source code

src/test.jsx

export function foo () {}

🌍 Your Environment