Introduction to "import no-anonymous-default-export"

When we write code in JavaScript or TypeScript, we often use "export" to make certain variables, functions, or classes available to other parts of our codebase. Similarly, when we import code from other modules or packages, we use "import" statements.

One common mistake that developers make when exporting code is to use an "anonymous default export." This means that they are exporting a variable, function, or class without giving it a name. For example:

export default class {
  // ...
}

This code exports a class without a name, which makes it difficult for other developers to understand what this class is supposed to do. To avoid this issue, we can use the "import no-anonymous-default-export" ESLint rule.

Using "import no-anonymous-default-export"

To use this rule in our codebase, we need to add it to our ESLint configuration file. Here's an example:

module.exports = {
  // ...
  rules: {
    "import/no-anonymous-default-export": 2,
    // ...
  },
};

This configuration sets the rule severity to "error" (level 2), which means that ESLint will throw an error if we use an anonymous default export. Once we add this rule to our codebase, we can fix any existing issues by giving a name to our default exports:

export default class MyClass {
  // ...
}

This code exports a "MyClass" class, which makes it clear to other developers what this class does. By following this best practice, we can make our codebase more readable and easier to maintain.

Conclusion

The "import no-anonymous-default-export" rule is a useful ESLint rule that encourages developers to use named exports instead of anonymous default exports. By following this best practice, we can make our codebase more readable and easier to maintain.