Invalid

const a = 4;

error[js/noUnusedVariables]: This variable is unused.
  ┌─ js/noUnusedVariables.js:1:7
  │
1 │ const a = 4;
  │       ^

Suggested fix: Remove this variable.
    | @@ -1 +1 @@
0   | - const a = 4;
  0 | + 

=  note: Unused variables usually are result of incomplete refactoring, typos and other source of bugs.

let a = 4;

error[js/noUnusedVariables]: This variable is unused.
  ┌─ js/noUnusedVariables.js:1:5
  │
1 │ let a = 4;
  │     ^

Suggested fix: Remove this variable.
    | @@ -1 +1 @@
0   | - let a = 4;
  0 | + 

=  note: Unused variables usually are result of incomplete refactoring, typos and other source of bugs.

function foo() {
};

error[js/noUnusedVariables]: This function is unused.
  ┌─ js/noUnusedVariables.js:1:10
  │
1 │ function foo() {
  │          ^^^

Suggested fix: Remove this function.
    | @@ -1,2 +1 @@
0   | - function foo() {
1   | - };
  0 | + ;

=  note: Unused variables usually are result of incomplete refactoring, typos and other source of bugs.

function foo(myVar) {
    console.log('foo');
}
foo();

error[js/noUnusedVariables]: This parameter is unused.
  ┌─ js/noUnusedVariables.js:1:14
  │
1 │ function foo(myVar) {
  │              ^^^^^

Suggested fix: Remove this parameter.
    | @@ -1,4 +1,4 @@
0   | - function foo(myVar) {
  0 | + function foo() {
1 1 |       console.log('foo');
2 2 |   }
3 3 |   foo();

=  note: Unused variables usually are result of incomplete refactoring, typos and other source of bugs.

const foo = () => {
};

error[js/noUnusedVariables]: This variable is unused.
  ┌─ js/noUnusedVariables.js:1:7
  │
1 │ const foo = () => {
  │       ^^^

Suggested fix: Remove this variable.
    | @@ -1,2 +1 @@
0   | - const foo = () => {
1   | - };
  0 | + 

=  note: Unused variables usually are result of incomplete refactoring, typos and other source of bugs.

function foo() {
    foo();
}

error[js/noUnusedVariables]: This function is unused.
  ┌─ js/noUnusedVariables.js:1:10
  │
1 │ function foo() {
  │          ^^^

Suggested fix: Remove this function.
    | @@ -1,3 +1 @@
0   | - function foo() {
1   | -     foo();
2   | - }
  0 | + 

=  note: Unused variables usually are result of incomplete refactoring, typos and other source of bugs.

const foo = () => {
    foo();
    console.log(this);
};

error[js/noUnusedVariables]: This variable is unused.
  ┌─ js/noUnusedVariables.js:1:7
  │
1 │ const foo = () => {
  │       ^^^

Suggested fix: Remove this variable.
    | @@ -1,4 +1 @@
0   | - const foo = () => {
1   | -     foo();
2   | -     console.log(this);
3   | - };
  0 | + 

=  note: Unused variables usually are result of incomplete refactoring, typos and other source of bugs.