How to get around issues with arrow functions in store class for jest testing?

Question

JavaScript

Hello. I'm setting up jest and there's a problem with arrow functions in stores.
It's in the jest documentation

Please note that if you use arrow functions in your classes, they will not be part of the mock. The reason for that is that arrow functions are not present on the object's prototype, they are merely properties holding a reference to a function.

I tried to set up babel to convert arrow functions

module.exports = {
  presets: [
    [
      "@babel/preset-env",
      {
        targets: {
          node: "current"
        }
      }
    ],
    "module:metro-react-native-babel-preset"
  ],
  plugins: [
    ["@babel/plugin-transform-arrow-functions", { spec: true }],
    [
      "@babel/plugin-proposal-decorators",
      {
        legacy: true
      }
    ]
  ]
};

however, it did not give any result.

Can anyone suggest ways to solve this problem without manually redefining functions in mocks?