Error "Element implicitly has an 'any' type" when accessing object by string key

Hello everyone! I'm new to TypeScript and encountered an error I can't understand. I have an object with predefined keys, and I want to get a value by a key that comes from a variable of type string. Here's a simplified example: ```typescript const userRoles = { admin: 'full access', editor: 'editing', viewer: 'view only' }; function getRole(roleName: string) { return userRoles[roleName]; } ``` TypeScript throws an error: ``` Element implicitly has an 'any' type because expression of type 'string' can't be used to index type '{ admin: string; editor: string; viewer: string; }'. No index signature with a parameter of type 'string' was found on type '{ admin: string; editor: string; viewer: string; }'. ``` I understand that the problem is in t