unicorn/no-anonymous-default-export

A default export without a name gives you nothing to search for, and every file that imports it makes up its own name. Stack traces show it as default or <anonymous>.

The rule looks at functions and classes, in export default and in module.exports =. Other values, such as objects and numbers, aren't reported.

Configure

Off by default. To turn it on:

[lint.rules]
"unicorn/no-anonymous-default-export" = "error" # or "warn"

Examples

Reported:

export default function (user) {
  return `${user.first} ${user.last}`;
}

export default (user) => `${user.first} ${user.last}`;

module.exports = class {
  items = [];
};

Not reported:

export default function fullName(user) {
  return `${user.first} ${user.last}`;
}

An arrow function doesn't have a name. Give it one with a variable:

const fullName = (user) => `${user.first} ${user.last}`;

export default fullName;

module.exports = class Cart {
  items = [];
};