Create a TypeScript arrow function and set it as the return value

Looking to create a TypeScript Declaration for ReactMeteorData.jsx, which consists of the following exporting functionality:

export default function connect(options) {
  let expandedOptions = options;
  if (typeof options === 'function') {
    expandedOptions = {
      getMeteorData: options,
    };
  }

  const { getMeteorData, pure = true } = expandedOptions;

  const BaseComponent = pure ? ReactPureComponent : ReactComponent;
  return (WrappedComponent) => (
    class ReactMeteorDataComponent extends BaseComponent {
      ...
    }
  );
}

This is then repackaged as withTracker by react-meteor-data.jsx:

export { default as withTracker } from './ReactMeteorData.jsx';

In order to handle this in my declaration without modifying the original package, I can simply define the return value as Function:

declare module 'meteor/react-meteor-data' {
  import * as React from 'react';    
  export function withTracker(func: () => {}): Function;
  
  ...
}

Is there a way to declare the arguments and returns of the Function without changing the original package? Ideally, it would look something like this:

export function withTracker(func: () => {}): (React.Component) => { React.Component };

The code is used as shown below:

import * as React from 'react';
import { withTracker } from 'meteor/react-meteor-data';

class Header extends React.Component<any,any> {
  render() {
    return "test";
  }
}

export default withTracker(() => {
  return { user: 1 };
})(Header);

Appreciate any guidance you can provide!

Answer №1

If you were to represent the type in question, it would look something like this:

(c: React.Component) => React.Component

Within the declare module section:

export function withTracker(func: () => {}): (c: React.Component) => React.Component;

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