unicorn/require-module-specifiers

import {} from "./setup.js" doesn't import any names. It's usually left over after the last name was removed. If you want the module to run for its side effects, import "./setup.js" says so.

--fix removes the empty braces after a default import. It removes export {} if the file has another import or export. Without one, that line is what makes the file a module: TypeScript rejects declare global in a script, and a script's top-level names are global. So only --fix-dangerously removes it there, and in a declaration file. No flag touches import {} from and export {} from, because they still load the module.

Configure#

Off by default. To turn it on:

[lint.rules]
"unicorn/require-module-specifiers" = "error" # or "warn"

Examples#

import {} from "./setup.js";
import app, {} from "./app.js";
export {};

import "./setup.js";
import app from "./app.js";
export { app };

When not to use it#

In TypeScript, export {} is a common way to make a file without imports or exports a module. Turn the rule off for those files, or set moduleDetection to "force" in tsconfig.json.