new react apps state is undefined on class based component without a constructor

[jlbaker99]

Describe the bug

Using state on a class based component without a constructor and creating methods will not compile because they are undefined. Using the EXACT same code in a react app I created over the weekend, it compiles and runs fine. Trying to create a new react app via 'npx create-react-app ' will not compile.

Did you try recovering your dependencies?

Yes I tried removing node_modules and creating new react apps via 'npx create-react-app test' numerous times

Which terms did you search for in User Guide?

State undefined class based component

Environment

It was not copies to my clipboard directly so heres my copy paste:
Environment Info:

current version of create-react-app: 4.0.3
running from /Users/joseph/.npm/_npx/c67e74de0542c87c/node_modules/create-react-app

System:
OS: macOS 11.1
CPU: (8) x64 Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz
Binaries:
Node: 14.15.4 - ~/.nvm/versions/node/v14.15.4/bin/node
Yarn: Not Found
npm: 7.5.6 - ~/.nvm/versions/node/v14.15.4/bin/npm
Browsers:
Chrome: 88.0.4324.192
Edge: Not Found
Firefox: 85.0.2
Safari: 14.0.2
npmPackages:
react: ^17.0.1 => 17.0.1
react-dom: ^17.0.1 => 17.0.1
react-scripts: 4.0.3 => 4.0.3
npmGlobalPackages:
create-react-app: Not Found

Steps to reproduce

(Write your steps here:)

1. npx create-react-app test
2. create a class based component
3. initialize state without the use of a constructor or write an arrow function.

Expected behavior

State would be initialized and my app would compile

Actual behavior

state is undefined. method is undefined.
screenshot

Reproducible demo

I do not have the time at the moment to upload a link to a project. I will try to get a repo up soon if you need

[brightsider]

Same issue

[ewein]

Yup same here

[dave-jobalign]

same here.

this changed from last Friday build for us. using all exact match versions, the total packages increased by 5, trying to track down

[brightsider]

broken in last 24 h

[dave-jobalign]

check out @svgr/webpack > @babel/preset-env and @babel/preset-react

[dreammyboy]

Is this issue related to babel? Babel just updated from 7.12.x to 7.13.x. I got an issue that arrow function not working in react class. Fixed it with downgrading babel back to 7.12.x

[m3yevn]

same issue. how do we fix? any workaround?

[Thirunavukkarasu]

We are having the same issue not only for class component without constructor it is happening even with constructor as well. Please kindly notify if there are any workaround.

[Thirunavukkarasu]

Issue got fixed now automatically without any code change. While doing yarn build and yarn start it is working fine now. Thanks!

[median-man]

Issue got fixed now automatically without any code change. While doing yarn build and yarn start it is working fine now. Thanks!

Same

[cartermr]

Creating a react app through create-react-app causing something to break, breaks the binding to "this". arrow functions in classes are undefined. npm installing react, react-dom, and react-scripts without create-react-app, and arrow functions work fine in classes.

[ravi123shanker]

Creating a react app through create-react-app causing something to break, breaks the binding to "this". arrow functions in classes are undefined. npm installing react, react-dom, and react-scripts without create-react-app, and arrow functions work fine in classes.

Still got the same issue after reinstalling.

[ravi123shanker]

arrow function compilation failed: 'myFun' is not defined no-undef