---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: invalid.ts
---
# Input
```ts
let someVar1;
someVar1 = '123';
someVar1 = 123;

var someVar1;
someVar1 = '123';
someVar1 = 123;

let x = 0, y, z = 0;
var x = 0, y, z = 0;
for(let a = 0, b; a < 5; a++) {}

function ex() {
    let b;
}

```

# Diagnostics
```
invalid.ts:1:5 lint/suspicious/noImplicitAnyLet ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This variable implicitly has the any type.
  
  > 1 │ let someVar1;
      │     ^^^^^^^^
    2 │ someVar1 = '123';
    3 │ someVar1 = 123;
  
  i Variable declarations without type annotation and initialization implicitly have the any type. Declare a type or initialize the variable with some value.
  

```

```
invalid.ts:5:5 lint/suspicious/noImplicitAnyLet ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This variable implicitly has the any type.
  
    3 │ someVar1 = 123;
    4 │ 
  > 5 │ var someVar1;
      │     ^^^^^^^^
    6 │ someVar1 = '123';
    7 │ someVar1 = 123;
  
  i Variable declarations without type annotation and initialization implicitly have the any type. Declare a type or initialize the variable with some value.
  

```

```
invalid.ts:9:12 lint/suspicious/noImplicitAnyLet ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This variable implicitly has the any type.
  
     7 │ someVar1 = 123;
     8 │ 
   > 9 │ let x = 0, y, z = 0;
       │            ^
    10 │ var x = 0, y, z = 0;
    11 │ for(let a = 0, b; a < 5; a++) {}
  
  i Variable declarations without type annotation and initialization implicitly have the any type. Declare a type or initialize the variable with some value.
  

```

```
invalid.ts:10:12 lint/suspicious/noImplicitAnyLet ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This variable implicitly has the any type.
  
     9 │ let x = 0, y, z = 0;
  > 10 │ var x = 0, y, z = 0;
       │            ^
    11 │ for(let a = 0, b; a < 5; a++) {}
    12 │ 
  
  i Variable declarations without type annotation and initialization implicitly have the any type. Declare a type or initialize the variable with some value.
  

```

```
invalid.ts:11:16 lint/suspicious/noImplicitAnyLet ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This variable implicitly has the any type.
  
     9 │ let x = 0, y, z = 0;
    10 │ var x = 0, y, z = 0;
  > 11 │ for(let a = 0, b; a < 5; a++) {}
       │                ^
    12 │ 
    13 │ function ex() {
  
  i Variable declarations without type annotation and initialization implicitly have the any type. Declare a type or initialize the variable with some value.
  

```

```
invalid.ts:14:9 lint/suspicious/noImplicitAnyLet ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This variable implicitly has the any type.
  
    13 │ function ex() {
  > 14 │     let b;
       │         ^
    15 │ }
    16 │ 
  
  i Variable declarations without type annotation and initialization implicitly have the any type. Declare a type or initialize the variable with some value.
  

```