Merge a ...[] expression into the outer array literal or destructuring expression.

Flatten array rest/spread property

Remove console.log

### Why is this refactoring helpful?
Removing an unnecessary double negation simplifies the code.

Remove double negation (`!!`) expressions.

Remove double negation

Remove an empty 'else' block from an 'if' statement.

Remove empty else block

Remove an empty 'if' block from an 'if' statement. Replaces it with the 'else' block when available.

Remove empty if block

Remove immediately-invoked function expressions (IIFEs) and immediately-invoked arrow functions (IIAFs) without parameters.

Remove IIFE/IIAF

Remove redundant else-if conditions and unreachable else statements.

Remove redundant else if

Remove trailing array destructuring holes and empty array destructuring expressions.

Remove trailing array destructuring holes

The "Remove unnecessary conditional expression" refactoring replaces a conditional expression (ternary) in two situations:

1. When the ternary returns `true` when truthy and `false` when falsy.
   ```javascript
   aCondition ? true : false
   // changes into:
   aCondition
   ```

1. When the ternary returns the same value, regardless of whether the condition is truthy or falsy:
   ```javascript
   aCondition ? aValue : aValue
   // changes into:
   aValue
   ```

Replace a conditional expression with its condition or its result.

Remove unnecessary conditional expression

Lift the else content of an `if`-`else` with a return statement to the outer indentation level.

Remove unnecessary else

### Why is this refactoring useful?
An expression statement without side effects does not affect the behavior of the program. Removing it reduces the amount of code that needs to be understood and removes unnecessary computation.

Remove an expression statement that has no side-effects.

Remove unnecessary expression statement

Replace JSX Fragments `<></>` that only contain a single child with that child.

Remove unnecessary JSX fragment

### Why is this useful?
Unnecessary template literals add accidental complexity. They make the code harder to understand and can prevent the detection of further improvement opportunities.

Simplify a template literal with a single inner expression and no prefix or suffix.

Remove unnecessary template literal

Remove a variable that is not read or written.

Remove unused variable

This refactoring replaces `void 0` and other constant `void` expressions without side-effects with `undefined` (unless `undefined` is declared as a local variable).

Replace `void 0` and other constant `void` expressions with `undefined`.

Replace void 0 with undefined

Replace binary expression with a more straightforward equivalent expression.

Simplify binary expression

Remove an unnecessary switch statement or replace it with its content.

Simplify switch statement

Code cleanups remove unnecessary code. Such code can result from code churn, e.g., by applying other refactorings, adding new features, or fixing bugs. The JS Assistant shows hints and automates the cleanup for the following situations:

17 Code Cleanups