Fix TS types + add better documentation

Author: Vadorequest

src/types/pageProps/SSGPageProps.ts

@@ -12,5 +12,8 @@ import { MultiversalPageProps } from './MultiversalPageProps';
  * XXX SSGPageProps doesn't extend from OnlyBrowserPageProps (like SSRPageProps does with OnlyServerPageProps) because SSG properties are actually generated by the server and don't have access to browser variables
  */
 export type SSGPageProps<E extends {} = {}> = {
+  // Props that are specific to SSG
   isStaticRendering: boolean;
-} & MultiversalPageProps & MultiversalAppBootstrapPageProps &E;
+} & MultiversalPageProps // Generic props that are provided immediately, no matter what
+  & Partial<MultiversalAppBootstrapPageProps> // Pages served by SSG eventually benefit from props injected by the MultiversalAppBootstrap component
+  & E;

src/types/pageProps/SSRPageProps.ts

@@ -11,5 +11,8 @@ import { OnlyServerPageProps } from './OnlyServerPageProps';
  * Client-side page props are listed in SSGPageProps
  */
 export type SSRPageProps<E extends OnlyServerPageProps = OnlyServerPageProps> = {
+  // Props that are specific to SSR
   isServerRendering: boolean;
-} & MultiversalPageProps & MultiversalAppBootstrapPageProps & E;
+} & MultiversalPageProps // Generic props that are provided immediately, no matter what
+  & Partial<MultiversalAppBootstrapPageProps> // Pages served by SSR eventually benefit from props injected by the MultiversalAppBootstrap component
+  & E;