Use null value to set "No environment" (#5027)

packages/insomnia/src/ui/components/dropdowns/environments-dropdown.tsx

@@ -20,7 +20,7 @@ import { Tooltip } from '../tooltip';
 interface Props {
   activeEnvironment?: Environment | null;
   environmentHighlightColorStyle: EnvironmentHighlightColorStyle;
-  handleSetActiveEnvironment: Function;
+  handleSetActiveEnvironment: (id: string | null) => void;
   workspace: Workspace;
 }
 
@@ -96,7 +96,7 @@ export const EnvironmentsDropdown: FC<Props> = ({
           </DropdownItem>
         ))}
 
-        <DropdownItem onClick={handleSetActiveEnvironment}>
+        <DropdownItem value={null} onClick={handleSetActiveEnvironment}>
           <i className="fa fa-empty" /> No Environment
         </DropdownItem>
 

packages/insomnia/src/ui/components/wrapper-debug.tsx

@@ -34,7 +34,7 @@ interface Props {
   forceRefreshKey: number;
   gitSyncDropdown: ReactNode;
   handleActivityChange: HandleActivityChange;
-  handleSetActiveEnvironment: Function;
+  handleSetActiveEnvironment: (id: string | null) => void;
   handleSetActiveResponse: (requestId: string, activeResponse: Response | null) => void;
   handleForceUpdateRequest: (r: Request, patch: Partial<Request>) => Promise<Request>;
   handleForceUpdateRequestHeaders: (r: Request, headers: RequestHeader[]) => Promise<Request>;