complete/no-undefined-return-type

💼 This rule is enabled in the ✅ recommended config.

📝 Disallows undefined return types on functions.

💭 This rule requires type information.

Rule Details

A function that only returns undefined is confusing and likely to be a mistake, since a function that returns nothing should have a return type of void.

// Bad
function foo(): undefined {
  return;
}

// Good
function foo(): void {
  return;
}

// Bad
function foo() {
  return undefined;
}

// Good
function foo() {
  return;
}

Options

This rule is not configurable.

Resources

• How to use this rule
• Rule source
• Test source