Chapter 11

Prerequisites

The following software is required to run the sample:

• Git
• Node.js
• npm

Running

Go to the current directory and run npm install:

npm install

Now start the application:

npm start

Steps

Follow these steps to implement the same from scratch.

1. Initialize a new project and add the dependencies

npm init -y
npm install react react-dom --save
npm install @babel/core @babel/preset-env @babel/preset-react babel-loader file-loader style-loader webpack webpack-cli --save-dev

2. Add a webpack.config.js and make sure to target library (with the name of the package)

3. Add a .babelrc for Babel using the preset-react:

{
  "presets": ["@babel/preset-env", "@babel/preset-react"]
}

4. Copy over the balance sheet code from the previous sample

5. Change the index.jsx to export a setup function

export function setup(api) {
  let BalanceSheet = undefined;

  api.registerPage("/", {
    bootstrap: () =>
      import("./BalanceSheet").then((content) => {
        BalanceSheet = content.BalanceSheet;
      }),
    mount: (target) => render(<BalanceSheet onRender={api.renderExtension} />, target),
    unmount: (target) => render(null, target),
  });
}

6. Change the BalanceSheet to forward the onRender prop, pointing to the renderExtension API

7. Use the onRender prop in the MoreBalanceInfo component:

const MoreBalanceInfo = ({ onRender, ...props }) => {
  const ref = React.useRef(null);

  React.useEffect(() => {
    return onRender(ref.current, "balance-info", props);
  }, []);

  return <slot ref={ref} />;
};

8. Build the MF with Webpack (npx webpack --mode production) and then publish it using

npm pack
curl -F 'file=@./balance-1.0.0.tgz' http://localhost:9000/modules
rm *.tgz

where localhost:9000 is the address of the feed server