We want to be able to register 3rd-party components in an application and replace the default component in case there is a component already registered.

The PoC app works showing a list of products (the data can be found in data/products.json) that can be modified using the SDK of the application that is exposed in the MyApp variable.

The application has a component registrar manager that listens to custom events in the DOM. When a custom event to register a component happens, the component registrar manager triggers a callback that is listener by a React Custom Hook (hooks/useCustomComponent.tsx) whose responsibility is to register the custom component and provide a simplified API to access it.

The application exposes a small API in the window variable, this API has the following methods:

• MyApp.registerComponent(aSection: string, theComponent: ReactComponent): This method will trigger the custom event to register a custom component for a given section. There are 3 sections: product, product-image and product-description.

function ProductWithTags({ product }) {
  return /*#__PURE__*/React.createElement("article", null, /*#__PURE__*/React.createElement("h1", null, product.title), /*#__PURE__*/React.createElement("div", {
    style: {
      display: 'flex',
      width: '90%',
      flexWrap: 'wrap',
      justifyContent: 'center'
    }
  }, product.tags.map(tag => /*#__PURE__*/React.createElement("span", {
    style: {
      margin: '10px'
    }
  }, tag))));
}

window.MyApp.registerComponent('product', ProductWithTags);

function RoundedProductImage({ product }) {
  return /*#__PURE__*/ React.createElement("img", {
    src: product.featured_image,
    style: {
      borderRadius: "100%"
    }
  });
}

window.MyApp.registerComponent('product-image', RoundedProductImage);

function GrayscaleProductImage({ product }) {
  return /*#__PURE__*/ React.createElement("img", {
    src: product.featured_image,
    style: {
      filter: "grayscale(100%)"
    }
  });
}

window.MyApp.registerComponent('product-image', GrayscaleProductImage);

function ReverseProductTitle({ product }) {
  const reverseText = Array.from(product.title).reverse().join("");
  return /*#__PURE__*/ React.createElement("h1", null, reverseText);
}

window.MyApp.registerComponent('product-description', ReverseProductTitle);

1. Clone the repository
2. Install the dependencies using Yarn: yarn install
3. Execute the application using the development environment: yarn dev

• This PoC doesn't support the custom components using JSX, the user must transpile the components before using them in the application. This could be improved in a next version by adding a Babel transpilation step to the registerComponent function.

• There are no unit tests for this PoC. This could be easily fixed if neccesary.

• There is no UI for the interaction with the API. With the current implementation, no backend is needed. If this is desired, the UI could be implemented.

• Custom components are not persisted between page reloads due to the abscence of a backend.