Support for the experimental syntax 'classProperties' isn't currently enabled

[antonello-alfatauristudio]

Just installed in my ionic/capacitor + react app and got this error after npm run start:

Failed to compile.

./node_modules/mangopay-client-react/lib/Client.js
SyntaxError: /Users/antonellogatto/workspace/toefrom-ionic-app/node_modules/mangopay-client-react/lib/Client.js: Support for the experimental syntax 'classProperties' isn't currently enabled (16:26):

  14 |     }
  15 | 
> 16 |     static mangoPayClient;
     |                          ^
  17 | 
  18 |     /**
  19 |      * Get Client Instance

Add @babel/plugin-proposal-class-properties (https://git.io/vb4SL) to the 'plugins' section of your Babel config to enable transformation.