exportUniqueNames

Reports duplicate export names in a module.

✅ This rule is included in the ts untyped presets.

Having multiple exports with the same name creates ambiguity about which value is exported. This can lead to confusion and runtime errors when consuming the module.

Examples

❌ Incorrect

export const value = 1;
Error ts(2323)  ― Cannot redeclare exported variable 'value'.
export { value };
Error ts(2323)  ― Cannot redeclare exported variable 'value'.
Error ts(2484)  ― Export declaration conflicts with exported declaration of 'value'.

const a = 1;
const b = 2;
export { a };
Error ts(2300)  ― Duplicate identifier 'a'.
export { b as a };
Error ts(2300)  ― Duplicate identifier 'a'.

✅ Correct

export const value = 1;

const a = 1;
const b = 2;
export { a, b };

Options

This rule is not configurable.

When Not To Use It

This rule catches actual errors, so you should generally keep it enabled. TypeScript itself will catch many of these cases, but this rule provides earlier feedback.

Further Reading

• MDN: export

Equivalents in Other Linters

• ESLint: import/exports
• Oxlint: import/exports