1 files changed, 18 insertions, 0 deletions
diff --git a/runtime/ops/bootstrap.rs b/runtime/ops/bootstrap.rs
index 1d4039d73..7de532a9f 100644
--- a/runtime/ops/bootstrap.rs
+++ b/runtime/ops/bootstrap.rs
@@ -17,6 +17,7 @@ deno_core::extension!(
     op_bootstrap_log_level,
     op_bootstrap_no_color,
     op_bootstrap_is_tty,
+    op_bootstrap_unstable_args,
     op_snapshot_options,
   ],
   options = {
@@ -70,6 +71,23 @@ pub fn op_bootstrap_user_agent(state: &mut OpState) -> String {
 }
 
 #[op2]
+#[serde]
+pub fn op_bootstrap_unstable_args(state: &mut OpState) -> Vec<String> {
+  let options = state.borrow::<BootstrapOptions>();
+  if options.unstable {
+    return vec!["--unstable".to_string()];
+  }
+
+  let mut flags = Vec::new();
+  for (name, _, id) in crate::UNSTABLE_GRANULAR_FLAGS.iter() {
+    if options.unstable_features.contains(id) {
+      flags.push(format!("--unstable-{}", name));
+    }
+  }
+  flags
+}
+
+#[op2]
 #[string]
 pub fn op_bootstrap_language(state: &mut OpState) -> String {
   state.borrow::<BootstrapOptions>().locale.clone()