Ink: TypeError: Class constructor Component cannot be invoked without 'new'

[maticzav]

Hi guys!
So I am getting this error, been busting my head over it all day, any thought?

Help, much appreciated 😄.

src/index.js

import {h, render, Component} from 'ink'

export default class extends Component {
  render() {
    return (
      <div>a</div>
    )
  }
}

demo.js

import {h, render} from 'ink'
import Route from './src/index'

// Router
const Demo = () => {
  return (
    <Route/>
  )
}

// Ink
render(<Demo/>)

.babelrc

{
  "presets": ["es2015", "stage-2"],
  "plugins": [
    ["transform-class-properties"],
    ["transform-react-jsx", {
      "pragma": "h",
      "useBuiltIns": true
    }],
    ["transform-object-rest-spread",
    {
      "useBuiltIns": true
    }]

  ]
}

package.json

{
  "name": "ink-router",
  "version": "1.0.0",
  "description": "A router component for Ink.",
  "license": "MIT",
  "main": "dist/index.js",
  "scripts": {
    "pretest": "npm run build",
    "test": "xo",
    "start": "babel-node dist/index.js",
    "demo": "babel-node demo.js",
    "build": "babel src --out-dir=dist",
    "prepublish": "npm run build"
  },
  "engines": {
    "node": ">=6"
  },
  "files": [
    "dist"
  ],
  "keywords": [
    "ink",
    "ink-component"
  ],
  "dependencies": {
    "ink": "^0.3.0",
    "prop-types": "^15.5.10"
  },
  "devDependencies": {
    "babel-cli": "^6.24.1",
    "babel-eslint": "^7.2.3",
    "babel-plugin-transform-class-properties": "^6.24.1",
    "babel-plugin-transform-object-rest-spread": "^6.23.0",
    "babel-plugin-transform-react-jsx": "^6.24.1",
    "babel-preset-es2015": "^6.24.1",
    "babel-preset-node6": "^11.0.0",
    "babel-preset-stage-2": "^6.24.1",
    "eslint-config-xo-react": "^0.13.0",
    "eslint-plugin-react": "^7.2.0",
    "eslint-plugin-xo": "^1.0.0",
    "xo": "^0.18.2"
  },
  "xo": {
    "extends": "xo-react",
    "parser": "babel-eslint",
    "esnext": true,
    "space": true,
    "semicolon": false,
    "rules": {
      "new-cap": 0,
      "complexity": 0,
      "default-case": 0,
      "react/no-unused-prop-types": 1
    },
    "settings": {
      "react": {
        "pragma": "h"
      }
    }
  }
}

[vadimdemedes]

This is happening, because Babel's preset-es2015 transpiles ES6 classes. This is a very popular issue, I'd say - https://github.com/babel/babel/issues/4269.

Solution would be to use presets that target more modern Node.js versions, for example - https://www.npmjs.com/package/babel-preset-es2015-node5.

[maticzav]

It works now! Thank you so much!!

[vadimdemedes]

You're welcome :)

[mgrip]

if anyone stumbles upon this using the env preset like I was, you can set a more specific target to prevent babel from transpiling ES6 classes

.babelrc:

{
  "presets": [["env", { "targets": { "node": "current" } }]],
  "plugins": [
    [
      "transform-react-jsx",
      {
        "pragma": "h"
      }
    ]
  ]
}

[KumaresanDevi]

HI @vadimdemedes ,

Help needed here also:

https://github.com/angular/angular-cli/issues/15392

[vadimdemedes]

@KumaresanDevi how is it related?