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JavaScript Building Applications with React and Redux Putting it all Together Updating the Player, Counter and AddPlayerForm Components

page won't render

I'm using VSCode and I keep getting an error in my code as well as the console

In my AddPlayerForm.js file I get this error

'types' can only be used in a .ts file.ts(8010)

It appears over

static propTypes: {
      addPlayer: PropTypes.func.isRequired,

THen in the console I recieve this error

Uncaught TypeError: _react.default.createContext is not a function

here is my AddPlayerForm.js file

import React, { Component, PropTypes } from 'react';

 export default class AddPlayerForm extends Component {
static propTypes: {
      addPlayer: PropTypes.func.isRequired,

      state = {
          name: ''

      onNameChange = (e) => {
        const name = e.target.value;
        this.setState({ name: name });

      addPlayer = (e) => {
        if (e) e.preventDefault();
        this.setState({ name: '' });

      render() {
        return (
          <div className="add-player-form">
            <form onSubmit={this.addPlayer}>
                placeholder="Player Name"
              <input type="submit" value="Add Player" />

1 Answer

John Nguyen
.a{fill-rule:evenodd;}techdegree seal-36
John Nguyen
Full Stack JavaScript Techdegree Graduate 30,501 Points

To solve the error for 'types' can only be used in a .ts file.ts(8010), you can update the syntax to show:

static propTypes = {
  addPlayer: PropTypes.func.isRequired,

As for the other error: Uncaught TypeError: _react.default.createContext is not a function, it (most likely) has to do with your react-redux and redux versions.

I solved the issue by

1) downloading the project files(for this video) and copying the package.json file from the 'final' version of this video.


  "name": "react-redux-course",
  "version": "1.0.0",
  "description": "React-Redux course for Treehouse",
  "main": "src/index.js",
  "scripts": {
    "prestart": "npm run lint",
    "start": "webpack-dev-server --progress --inline --hot",
    "lint": "eslint ./src/**/*.{js, jsx} --fix",
    "test": "echo \"Error: no test specified\" && exit 1"
  "keywords": [
  "author": "Beau Palmquist",
  "license": "MIT",
  "dependencies": {
    "react": "^15.3.2",
    "react-dom": "^15.3.2",
    "react-redux": "^4.4.5",
    "redux": "^3.6.0"
  "devDependencies": {
    "babel-core": "^6.13.2",
    "babel-eslint": "^6.1.2",
    "babel-loader": "^6.2.7",
    "babel-preset-es2015": "^6.13.2",
    "babel-preset-react": "^6.11.1",
    "babel-preset-stage-0": "^6.5.0",
    "eslint": "^3.3.1",
    "eslint-plugin-react": "^6.1.2",
    "react-hot-loader": "^1.3.0",
    "webpack": "^1.13.2",
    "webpack-dev-server": "^1.16.2"

2) running npm i

And that should fix the issue.

If you are still running into issues, you'd want to check your code compared to the 'final' version of this video's code. I had to do this and I used diffchecker.com to compare my code to the 'final' version.