Allow undefined as exported value

Author: mischnic

crates/next-core/src/segment_config.rs

@@ -546,6 +546,9 @@ async fn parse_config_value(
                     .await;
                 };
 
+                if matches!(val, JsValue::Constant(ConstantValue::Undefined)) {
+                    return Ok(());
+                }
                 match key {
                     "runtime" => {
                         let Some(val) = val.as_str() else {
@@ -636,6 +639,9 @@ async fn parse_config_value(
         }
         "dynamic" => {
             let value = get_value();
+            if matches!(value, JsValue::Constant(ConstantValue::Undefined)) {
+                return Ok(());
+            }
             let Some(val) = value.as_str() else {
                 return invalid_config(
                     source,
@@ -665,7 +671,9 @@ async fn parse_config_value(
         }
         "dynamicParams" => {
             let value = get_value();
-
+            if matches!(value, JsValue::Constant(ConstantValue::Undefined)) {
+                return Ok(());
+            }
             let Some(val) = value.as_bool() else {
                 return invalid_config(
                     source,
@@ -703,7 +711,9 @@ async fn parse_config_value(
         }
         "fetchCache" => {
             let value = get_value();
-
+            if matches!(value, JsValue::Constant(ConstantValue::Undefined)) {
+                return Ok(());
+            }
             let Some(val) = value.as_str() else {
                 return invalid_config(
                     source,
@@ -733,7 +743,9 @@ async fn parse_config_value(
         }
         "runtime" => {
             let value = get_value();
-
+            if matches!(value, JsValue::Constant(ConstantValue::Undefined)) {
+                return Ok(());
+            }
             let Some(val) = value.as_str() else {
                 return invalid_config(
                     source,
@@ -763,7 +775,9 @@ async fn parse_config_value(
         }
         "preferredRegion" => {
             let value = get_value();
-
+            if matches!(value, JsValue::Constant(ConstantValue::Undefined)) {
+                return Ok(());
+            }
             let preferred_region = match value {
                 // Single value is turned into a single-element Vec.
                 JsValue::Constant(ConstantValue::Str(str)) => vec![str.to_string().into()],
@@ -814,6 +828,9 @@ async fn parse_config_value(
         }
         "experimental_ppr" => {
             let value = get_value();
+            if matches!(value, JsValue::Constant(ConstantValue::Undefined)) {
+                return Ok(());
+            }
             let Some(val) = value.as_bool() else {
                 return invalid_config(
                     source,