fix: 🐛 improve TypeScript typings of withT() HOC

Author: streamich

src/createTranslations.ts

@@ -142,12 +142,12 @@ export const createTranslations = (ns: string = 'main'): Result => {
     return [state.createT ? state.createT(nss) : defaultT, state];
   };
 
-  const withT: WithT = <T extends React.ComponentType>(Comp: T, nss: string | string[] = ns) => {
+  const withT: WithT = (Comp, nss = ns) => {
     if (!Array.isArray(nss)) nss = [nss];
     return (props => {
       const [t, T] = useT(nss as string[]);
       return React.createElement(Comp, {...(props as any), t, T});
-    }) as T;
+    });
   };
 
   const Trans: React.FC<TransProps> = (props) => {

src/types.ts

@@ -49,8 +49,13 @@ export interface TransProps {
 // React hook.
 export type UseT = (namespaces?: string[]) => [TranslatorFn, ProviderState];
 
-// Higler order component.
-export type WithT = (Comp: React.SFC<any>, ns?: string | string[]) => React.SFC<any>;
+export interface WithTProps {
+  t: TranslatorFn;
+  T: ProviderState;
+}
+
+// Higher order component.
+export type WithT = <P extends WithTProps>(Comp: React.ComponentType<P>, ns?: string | string[]) => React.FC<Omit<P, 't' | 'T'>>;
 
 export interface Result {
   Provider: React.ComponentClass<ProviderProps, ProviderState>;