bun:test/no-export

When another file imports from a test file, the whole test file runs, including its test() calls, so its tests can run as part of the importing file. Put shared helpers in their own file.

The rule only checks files named like tests. That means the name ends in test or spec before the extension, such as cart.test.ts, or the file is under a __tests__ directory. A file with no test or it call can export anything. Exported types are allowed, because importing a type doesn't run the file.

This rule is on by default in files that import from "bun:test".

Configure#

On by default as a warning. To turn it off:

[lint.rules]
"bun:test/no-export" = "off" # or "error"

Examples#

import { expect, test } from "bun:test";

export function makeCart() {
  return { items: [] };
}

test("starts empty", () => {
  expect(makeCart().items).toEqual([]);
});

Not reported, with the helper in its own file:

export function makeCart() {
  return { items: [] };
}

import { expect, test } from "bun:test";
import { makeCart } from "./helpers";

export type Cart = ReturnType<typeof makeCart>;

test("starts empty", () => {
  expect(makeCart().items).toEqual([]);
});