Having an error after creating production build of a project

[Okami92]

in dev mode, everything works fine, but when making production build, I am having this error:

http://prntscr.com/katck3

is there a reason why this can happen? I am using 2.0.0-beta-3 of react-to-print and webpack 4.6.0

[gregnb]

Hey @Okami92 sorry to hear that. Can you try visiting: https://kmmw7l39y7.codesandbox.io/#

Does that work for you?

[Okami92]

@gregnb yes, this works. could you please help me with my issue? do you have any ideas how this is possible?

http://prntscr.com/kau111

not sure what is wrong here

[gregnb]

Could you paste me your package.json and also is there any chance you could share the portion of your app that does the printing into a separate repo so we could look into it? more than happy to help

[Okami92]

@gregnb sure, thanks a lot! I'll prepare separate repo for you in a moment

  "name": "",
  "version": "1.0.0",
  "description": "npm i -g prettier",
  "main": "index.js",
  "scripts": {
    "clean": "rimraf dist",
    "dev": "cross-env NODE_ENV=development node devServer.js",
    "build": "npm run clean && cross-env NODE_ENV=production webpack --config=webpack.build.config.js -p && node productionServer.js",
    "flow": "flow"
  },
  "author": "",
  "license": "ISC",
  "browserslist": [
    "last 5 versions",
    "not ie < 11"
  ],
  "prettier": {
    "singleQuote": true,
    "trailingComma": "all"
  },
  "dependencies": {
    "axios": "^0.18.0",
    "babel-plugin-styled-components": "^1.5.1",
    "es6-promise": "^4.2.4",
    "prop-types": "^15.6.1",
    "qs": "^6.5.2",
    "react": "^16.3.2",
    "react-custom-scrollbars": "^4.2.1",
    "react-dnd": "^3.0.2",
    "react-dnd-touch-backend": "^0.4.0",
    "react-dom": "^16.3.2",
    "react-motion": "^0.5.2",
    "react-redux": "^5.0.7",
    "react-router-dom": "^4.2.2",
    "react-slick": "^0.23.1",
    "react-to-print": "^2.0.0-beta-3",
    "redux": "^4.0.0",
    "redux-thunk": "^2.2.0",
    "slick-carousel": "^1.8.1",
    "styled-components": "^3.2.6",
    "xml2js": "^0.4.19"
  },
  "devDependencies": {
    "autoprefixer": "^8.3.0",
    "babel-core": "^6.26.0",
    "babel-eslint": "^8.2.3",
    "babel-loader": "^7.1.4",
    "babel-plugin-transform-class-properties": "^6.24.1",
    "babel-plugin-transform-object-rest-spread": "^6.26.0",
    "babel-plugin-transform-runtime": "^6.23.0",
    "babel-preset-env": "^1.6.1",
    "babel-preset-flow": "^6.23.0",
    "babel-preset-react": "^6.24.1",
    "browserslist": "^3.2.4",
    "compression-webpack-plugin": "^1.1.11",
    "cross-env": "^5.1.4",
    "css-loader": "^0.28.11",
    "eslint": "^4.19.1",
    "eslint-config-airbnb": "^16.1.0",
    "eslint-config-prettier": "^2.9.0",
    "eslint-plugin-import": "^2.11.0",
    "eslint-plugin-jsx-a11y": "^6.0.3",
    "eslint-plugin-prettier": "^2.6.0",
    "eslint-plugin-react": "^7.7.0",
    "express": "^4.16.3",
    "extract-text-webpack-plugin": "^4.0.0-beta.0",
    "file-loader": "^1.1.11",
    "flow-bin": "^0.70.0",
    "html-webpack-plugin": "^3.2.0",
    "image-webpack-loader": "^4.2.0",
    "node-sass": "^4.8.3",
    "postcss-loader": "^2.1.4",
    "prettier-eslint": "^8.8.1",
    "react-hot-loader": "^4.0.0",
    "rimraf": "^2.6.2",
    "sass-loader": "^7.0.1",
    "style-loader": "^0.20.3",
    "url-loader": "^1.0.1",
    "webpack": "^4.6.0",
    "webpack-cli": "^2.1.2",
    "webpack-dev-middleware": "^3.1.2",
    "webpack-hot-middleware": "^2.22.1"
  }
}

[gregnb]

Great sounds good!

[Okami92]

@gregnb done: https://github.com/Okami92/print-error

npm i, npm run build - you'll see an error.

when npm run dev, it works fine.

[gregnb]

Ok I will try to look at this when I get some time today. Thank you

[gregnb]

Ok, so this issue comes from the fact that stateless components do not have refs:
facebook/react#4936

If you were to change your Printable component to a stateful component (ie: class Printable extends React.component) then this library will be able to attach to that ref.

I will look to add a warning into the library if the component to print happens to be stateless

[Okami92]

Yes, it works! Thanks a lot man! I wouldn't think about it without you 👍

[gregnb]

No problem!