selfAssignments

Reports self-assignments which have no effect and are likely errors.

✅ This rule is included in the ts logical and logicalStrict presets.

Self-assignments where a variable is assigned to itself have no effect and typically indicate an incomplete refactoring or a copy-paste error. These assignments serve no purpose and should be removed or corrected to assign the intended value.

Examples

❌ Incorrect

value = value;

count &&= count;

flags.value ||= flags.value;

data ??= data;

✅ Correct

value = newValue;

count &&= otherCount;

flag ||= defaultFlag;

data ??= fallbackData;

Options

This rule is not configurable.

When Not To Use It

There are rarely valid reasons to use self-assignment. In cases where you need to trigger getters/setters or proxies, consider adding a comment explaining the intentional self-assignment.

Further Reading

• MDN: Assignment operators
• MDN: Logical AND assignment
• MDN: Logical OR assignment
• MDN: Nullish coalescing assignment

Equivalents in Other Linters

• Biome: noSelfAssign
• Deno: no-self-assign
• ESLint: no-self-assign
• Oxlint: eslint/no-self-assign