import/no-anonymous-default-export

You can't search for a default export that has no name, and each importing file makes up its own name for it. An anonymous function or class also shows up without a useful name in stack traces and dev tools. Give the value a name first, then export it.

Functions, classes, arrow functions, objects, arrays, literals and new expressions are reported. The result of a call, as in export default defineConfig({}), is allowed by default.

Configure#

Off by default. To turn it on:

bunfig.toml

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

Every option, set to its default:

bunfig.toml

[lint.rules]
"import/no-anonymous-default-export" = ["error", {
  allowAnonymousFunction = false,
  allowAnonymousClass = false,
  allowArrowFunction = false,
  allowObject = false,
  allowArray = false,
  allowLiteral = false,
  allowNew = false,
  allowCallExpression = true,
}]

Examples#

example.js1 problem

export default function () {
  return "ok";
}

example.js1 problem

export default items => items.length;

example.js1 problem

export default { port: 3000 };

example.jsNo problems

export default function status() {
  return "ok";
}

example.jsNo problems

const config = { port: 3000 };

export default config;

example.jsNo problems

export default defineConfig({ port: 3000 });

Options#

Option	Default	What it allows
`allowAnonymousFunction`	`false`	`export default function () {}`
`allowAnonymousClass`	`false`	`export default class {}`
`allowArrowFunction`	`false`	`export default () => {}`
`allowObject`	`false`	`export default { port: 3000 }`
`allowArray`	`false`	`export default [1, 2]`
`allowLiteral`	`false`	`export default 42`, strings, template literals, regular expressions, `true`, `null`
`allowNew`	`false`	`export default new Server()`
`allowCallExpression`	`true`	`export default createServer()`

example.jswith { "allowObject": true }No problems

export default { port: 3000 };

example.jswith { "allowCallExpression": false }1 problem

export default defineConfig({ port: 3000 });