Error: Missing class properties transform

by

You need to install @babel/plugin-proposal-class-properties:

npm install @babel/plugin-proposal-class-properties --save-dev

or

yarn add @babel/plugin-proposal-class-properties --dev

and add the following to your Babel configuration file – usually .babelrc or babel.config.js.

"plugins": ["@babel/plugin-proposal-class-properties"],

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