jest/no-export Correctness

✅ This rule is turned on by default.

What it does

Prevents using exports if a file has one or more tests in it.

Why is this bad?

This rule aims to eliminate duplicate runs of tests by exporting things from test files. If you import from a test file, then all the tests in that file will be run in each imported instance. so bottom line, don't export from a test, but instead move helper functions into a separate file when they need to be shared across tests.

Example

export function myHelper() {}
describe("a test", () => {
  expect(1).toBe(1);
});

How to use

To enable this rule in the CLI or using the config file, you can use:

CLI

oxlint --deny jest/no-export --jest-plugin

Config (.oxlintrc.json)

{
  "plugins": ["jest"],
  "rules": {
    "jest/no-export": "error"
  }
}

References

• Rule Source