Type definition of LegendItem does not correspond to actual data

[julianegoe]

Expected behavior

When using TypeScript the LegendItem in my example is supposed to have a structure of
`{
text: string;

fillStyle: string;

strokeStyle: string;

lineWidth: number;

hidden: boolean,

index: number
}`

Current behavior

But in the type definitions of chart.js the index is missing and replaced by datasetIndex: Relevant File

Reproducible sample

https://www.typescriptlang.org/play?#code/JYWwDg9gTgLgBAbzgYQBYENYBo4BkCmA5vgHYAmAkjPiHAL5wBmUEtA5AMYawB0AVgGc2AbgCwAKAkA3THA4wAHnAC8cMhA4BXEKRg9iMAKIAbGroBCATwpkAFACIQltJhj2AlHHQC4ACQAqALK4yOgkMgImZiQwYuIyUHBOLrAqcCT4AO4o3DC28go4CBJwpXAwlmD4AFxwbOqahKgkmjBsWCVlZOgw6LXF4mVDcMboAEb4xgK1ANr2AEr4ZPY49ubGmvgrcPYAmpPGEJnb9gDiUPikJwAKmlBgpicA8lBhxPYAuh2Dw6XdvQJ8DBpnAZgNfr9RhNjLU2ABiOAQRhwABqEGoQm+EOG-z6oIAjAAmHD4gCcOAAzDgAKw4YlwClfTq-OgfZn0LFlCBgGDACAkEHg4YPRrAAX9dlDUzEcgSn7YqGTQWSiGaQHXCBimAAZQqplqMCgm052NKjGAxmoUFqtmlpEo1BAtQIModNE8ygAfIgVdiOPyBBBTDxDoRbUR7VR3XFTcMLjA7iQRhHyFGQDwxWR8EoADxwQm+4Z0E0QuiFsvy+gSOjuYRAA

Optional extra steps/info to reproduce

No response

Possible solution

Change the TypeDefinition to include the index

Context

I'm using Vue 3 with Typescript and my code editor throws an error.

chart.js version

v3.7.1

Browser name and version

Chrome 100.0.4896.127

Link to your project

No response