1 files changed, 19 insertions, 1 deletions
diff --git a/cli/args/mod.rs b/cli/args/mod.rs
index 0778dee79..1d28df124 100644
--- a/cli/args/mod.rs
+++ b/cli/args/mod.rs
@@ -723,7 +723,14 @@ impl CliOptions {
   }
 
   pub fn ts_type_lib_window(&self) -> TsTypeLib {
-    if self.flags.unstable {
+    if self.flags.unstable
+      || !self.flags.unstable_features.is_empty()
+      || self
+        .maybe_config_file
+        .as_ref()
+        .map(|f| !f.json.unstable.is_empty())
+        .unwrap_or(false)
+    {
       TsTypeLib::UnstableDenoWindow
     } else {
       TsTypeLib::DenoWindow
@@ -1264,6 +1271,17 @@ impl CliOptions {
         .unwrap_or(false)
   }
 
+  pub fn unstable_features(&self) -> Vec<String> {
+    let mut from_config_file = self
+      .maybe_config_file()
+      .as_ref()
+      .map(|c| c.json.unstable.clone())
+      .unwrap_or_default();
+
+    from_config_file.extend_from_slice(&self.flags.unstable_features);
+    from_config_file
+  }
+
   pub fn v8_flags(&self) -> &Vec<String> {
     &self.flags.v8_flags
   }