---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: invalidIndexParameter.ts
---
# Input
```ts
export interface X {
    [PascalCase: string]: unknown

    [CONSTANT_CASE: number]: unknown

    [snake_case: symbol]: unknown
}
```

# Diagnostics
```
invalidIndexParameter.ts:2:6 lint/style/useNamingConvention  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This index parameter name should be in camelCase.
  
    1 │ export interface X {
  > 2 │     [PascalCase: string]: unknown
      │      ^^^^^^^^^^
    3 │ 
    4 │     [CONSTANT_CASE: number]: unknown
  
  i The name could be renamed to `pascalCase`.
  
  i Safe fix: Rename this symbol in camelCase.
  
    1 1 │   export interface X {
    2   │ - ····[PascalCase:·string]:·unknown
      2 │ + ····[pascalCase:·string]:·unknown
    3 3 │   
    4 4 │       [CONSTANT_CASE: number]: unknown
  

```

```
invalidIndexParameter.ts:4:6 lint/style/useNamingConvention  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This index parameter name should be in camelCase.
  
    2 │     [PascalCase: string]: unknown
    3 │ 
  > 4 │     [CONSTANT_CASE: number]: unknown
      │      ^^^^^^^^^^^^^
    5 │ 
    6 │     [snake_case: symbol]: unknown
  
  i The name could be renamed to `constantCase`.
  
  i Safe fix: Rename this symbol in camelCase.
  
    2 2 │       [PascalCase: string]: unknown
    3 3 │   
    4   │ - ····[CONSTANT_CASE:·number]:·unknown
      4 │ + ····[constantCase:·number]:·unknown
    5 5 │   
    6 6 │       [snake_case: symbol]: unknown
  

```

```
invalidIndexParameter.ts:6:6 lint/style/useNamingConvention  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This index parameter name should be in camelCase.
  
    4 │     [CONSTANT_CASE: number]: unknown
    5 │ 
  > 6 │     [snake_case: symbol]: unknown
      │      ^^^^^^^^^^
    7 │ }
  
  i The name could be renamed to `snakeCase`.
  
  i Safe fix: Rename this symbol in camelCase.
  
    4 4 │       [CONSTANT_CASE: number]: unknown
    5 5 │   
    6   │ - ····[snake_case:·symbol]:·unknown
      6 │ + ····[snakeCase:·symbol]:·unknown
    7 7 │   }
  

```