# TS2411: Property '…' of type '…' is not assignable to '…' index type '…'.

> A property doesn't fit the type of an index signature in the same type. Change the property's type, or widen the index signature.

## What it means

An index signature like `[key: string]: number` says every string-named property has that type,
including the ones declared explicitly. A named property whose type isn't assignable to the
index signature's type breaks that promise.

## Example

```ts
export interface Scores {
  [name: string]: number;
  label: string;
}
```

## How to fix

- Widen the index signature: `[name: string]: number | string`.
- Or move the odd property out: `{ label: string; scores: Record<string, number> }`.

Source: https://ts-r.dev/errors/TS2411/