---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: invalid-declaration-merging.ts
---
# Input
```ts
// Type and value merging
export type Order = -1 | 0 | 1;

interface Order {
	f(): void;
}

class Order {
	prop: number;
}

enum Order {
	Lower = -1,
	Equal = 0,
	Upper = 1,
}

```

# Diagnostics
```
invalid-declaration-merging.ts:4:11 lint/suspicious/noRedeclare ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Shouldn't redeclare 'Order'. Consider to delete it or rename it.
  
    2 │ export type Order = -1 | 0 | 1;
    3 │ 
  > 4 │ interface Order {
      │           ^^^^^
    5 │ 	f(): void;
    6 │ }
  
  i 'Order' is defined here:
  
    1 │ // Type and value merging
  > 2 │ export type Order = -1 | 0 | 1;
      │             ^^^^^
    3 │ 
    4 │ interface Order {
  

```

```
invalid-declaration-merging.ts:8:7 lint/suspicious/noRedeclare ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Shouldn't redeclare 'Order'. Consider to delete it or rename it.
  
     6 │ }
     7 │ 
   > 8 │ class Order {
       │       ^^^^^
     9 │ 	prop: number;
    10 │ }
  
  i 'Order' is defined here:
  
    1 │ // Type and value merging
  > 2 │ export type Order = -1 | 0 | 1;
      │             ^^^^^
    3 │ 
    4 │ interface Order {
  

```

```
invalid-declaration-merging.ts:12:6 lint/suspicious/noRedeclare ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Shouldn't redeclare 'Order'. Consider to delete it or rename it.
  
    10 │ }
    11 │ 
  > 12 │ enum Order {
       │      ^^^^^
    13 │ 	Lower = -1,
    14 │ 	Equal = 0,
  
  i 'Order' is defined here:
  
    1 │ // Type and value merging
  > 2 │ export type Order = -1 | 0 | 1;
      │             ^^^^^
    3 │ 
    4 │ interface Order {
  

```