feat(types): Add proper dynamic function component type (#37)

Author: jquense

src/types.ts

@@ -4,7 +4,7 @@ export type EventKey = string | number;
 
 export type IntrinsicElementTypes = keyof JSX.IntrinsicElements;
 
-export type AssignProps<
+export type AssignPropsWithRef<
   Inner extends string | React.ComponentType<any>,
   P,
 > = Omit<
@@ -13,12 +13,39 @@ export type AssignProps<
 > &
   P;
 
+export type { AssignPropsWithRef as AssignProps };
+
+export type AssignPropsWithoutRef<
+  Inner extends string | React.ComponentType<any>,
+  P,
+> = Omit<
+  React.ComponentPropsWithoutRef<
+    Inner extends React.ElementType ? Inner : never
+  >,
+  keyof P
+> &
+  P;
+
 export interface DynamicRefForwardingComponent<
   TInitial extends string | React.ComponentType<any>,
-  P = unknown,
+  P = { children?: React.ReactNode },
+> {
+  <As extends string | React.ComponentType<any> = TInitial>(
+    props: AssignPropsWithRef<As, { as?: As } & P>,
+    context?: any,
+  ): React.ReactElement | null;
+  propTypes?: any;
+  contextTypes?: any;
+  defaultProps?: Partial<P>;
+  displayName?: string;
+}
+
+export interface DynamicFunctionComponent<
+  TInitial extends string | React.ComponentType<any>,
+  P = { children?: React.ReactNode },
 > {
   <As extends string | React.ComponentType<any> = TInitial>(
-    props: React.PropsWithChildren<AssignProps<As, { as?: As } & P>>,
+    props: AssignPropsWithoutRef<As, { as?: As } & P>,
     context?: any,
   ): React.ReactElement | null;
   propTypes?: any;
@@ -30,13 +57,13 @@ export interface DynamicRefForwardingComponent<
 export class DynamicComponent<
   As extends string | React.ComponentType<any>,
   P = unknown,
-> extends React.Component<AssignProps<As, { as?: As } & P>> {}
+> extends React.Component<AssignPropsWithRef<As, { as?: As } & P>> {}
 
 // Need to use this instead of typeof Component to get proper type checking.
 export type DynamicComponentClass<
   As extends string | React.ComponentType<any>,
   P = unknown,
-> = React.ComponentClass<AssignProps<As, { as?: As } & P>>;
+> = React.ComponentClass<AssignPropsWithRef<As, { as?: As } & P>>;
 
 export type SelectCallback = (
   eventKey: string | null,