avoid ISR on output=export mode

Author: cometkim

src/Packages.res

@@ -611,6 +611,9 @@ let getStaticProps: Next.GetStaticProps.revalidate<props, unit> = async _ctx =>
 
   {
     "props": props,
-    "revalidate": 43200,
+    "revalidate": switch Node.Process.env->Dict.get("BUILD_STATIC") {
+      | Some("true") => Nullable.undefined
+      | _ => Nullable.make(43200)
+    },
   }
 }

src/bindings/Next.res

@@ -34,7 +34,7 @@ module GetStaticProps = {
 
   type revalidate<'props, 'params> = context<'props, 'params> => promise<{
     "props": 'props,
-    "revalidate": int,
+    "revalidate": Nullable.t<int>,
   }>
 }
 

src/bindings/Next.resi

@@ -34,7 +34,7 @@ module GetStaticProps: {
 
   type revalidate<'props, 'params> = context<'props, 'params> => promise<{
     "props": 'props,
-    "revalidate": int,
+    "revalidate": Nullable.t<int>,
   }>
 }