I tested your solution on some swagger files and noticed that it was not converting names of linked/nested fields. For example, the name of Enums were only converted in the main type linking to an Enum in a namespace, but not in the namespace itself. Fields in a nested object were also not converted. See example below.

export type MyTools = {
  toolResources?: { // Case transformed correctly
    tool_for_you?: string; // Not case transformed in nested objects
  };
  tool: Tools.handyTool; // Enum is case transformed here
};

export namespace Tools {
  export enum handy_tool { // But not case transformed here - leads to TS error
    HAMMER_TIME = 'HAMMER_TIME',
    SAW = 'SAW',
  }
}

This PR fixes this by converting the case of all fields containing a name.

And thanks a lot for starting the PR. This is a great addition to the library :)