ESLint: Component definition is missing displayName (react/display-name)

ESLint: Component definition is missing displayName (react/display-name)

If you are working with React and using a hook component with antd library, you may come across an ESLint error stating “ESLint: Component definition is missing displayName (react/display-name)”. This error occurs when you set up columns for a table and the render function triggers the ESLint warning.

Understanding the ESLint Error

ESLint believes that you are defining a new component without setting any name to it. This can be confusing because ESLint cannot recognize the render prop pattern when it is not directly written into a component, but instead placed within an object.

To illustrate this issue, let’s take a look at a code snippet:

const columns_payment_summary_table = [
  {
    title: FooConstants.LABEL_QUANTITY_SELECTED,
    dataIndex: 'group',
    key: 'group',
    render: text => (
      <span>{getCountForCountry(text)}</span>
    ),
  }
]

In this example, the render prop is causing the ESLint error. The error indicates that the component definition is missing a displayName.

Solutions to Fix the ESLint Error

There are several approaches you can take to resolve the ESLint: Component definition is missing displayName (react/display-name) error:

1. Directly Embed the render Prop

You can put the render prop directly into the JSX implementation of the Column component:

const columns_payment_summary_table_render = text => (
  <span>{getCountForCountry(text)}</span>
);

const columns_payment_summary_table = [
  {
    title: FooConstants.LABEL_QUANTITY_SELECTED,
    dataIndex: 'group',
    key: 'group',
    // eslint-disable-next-line react/display-name
    render: columns_payment_summary_table_render,
  },
];

2. Disable the ESLint Warning

If you prefer not to modify the code structure, you can disable the ESLint rule specifically for the “react/display-name” warning. Add the following rule to your ESLint configuration:

{
  ...
  "rules": {
    "react/display-name": "off"
  }
}

3. Use a Normal Function for the Render Prop

Instead of using an arrow function, you can define a normal function for the render prop:

const columns_payment_summary_table = [
  {
    title: FooConstants.LABEL_QUANTITY_SELECTED,
    dataIndex: 'group',
    key: 'group',
    render: function countForCountry(text) {
      return <span>{getCountForCountry(text)}</span>
    },
  },
];

4. Define a Separate Function for the Render Prop

You can bypass the ESLint error by assigning a separate function to the render prop:

const getMyHTML = (text) => <span>{getCountForCountry(text)}</span>

const columns_payment_summary_table = [
  {
    title: FooConstants.LABEL_QUANTITY_SELECTED,
    dataIndex: 'group',
    key: 'group',
    render: getMyHTML,
  },
];

5. Use Anonymous Functions and Arrow Functions

Using anonymous functions and arrow functions together can also resolve the ESLint warning:

const columns_payment_summary_table = [
  {
    title: FooConstants.LABEL_QUANTITY_SELECTED,
    dataIndex: 'group',
    key: 'group',
    render: () => {
      return (function Actions() {
        return (
          <Button>
            View
          </Button>
        );
      })();
    },
  },
];

Conclusion

The ESLint: Component definition is missing displayName (react/display-name) warning is commonly encountered when setting up columns for a table in React. By following one of the solutions outlined above, you can effectively resolve this ESLint error and ensure your code remains clean and error-free.

Remember to consider the implications of disabling ESLint rules and choose the solution that best suits your needs. By addressing this warning, you can improve the maintainability and readability of your code. Happy coding!

reference :

https://stackoverflow.com/questions/55620562/eslint-component-definition-is-missing-displayname-react-display-name

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