vitest/prefer-to-be-truthy Style

🛠️ An auto-fix is available for this rule.

What it does

This rule warns when toBe(true) is used with expect or expectTypeOf. With --fix, it will be replaced with toBeTruthy().

Why is this bad?

Using toBe(true) is less flexible and may not account for other truthy values like non-empty strings or objects. toBeTruthy() checks for any truthy value, which makes the tests more comprehensive and robust.

Examples

Examples of incorrect code for this rule:

expect(foo).toBe(true);
expectTypeOf(foo).toBe(true);

Examples of correct code for this rule:

expect(foo).toBeTruthy();
expectTypeOf(foo).toBeTruthy();

How to use

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

CLI

oxlint --deny vitest/prefer-to-be-truthy --vitest-plugin

Config (.oxlintrc.json)

{
  "plugins": ["vitest"],
  "rules": {
    "vitest/prefer-to-be-truthy": "error"
  }
}

References

• Rule Source