1 files changed, 73 insertions, 0 deletions
diff --git a/cli/tools/registry/graph.rs b/cli/tools/registry/graph.rs
index 4d061e3da..2a3b4cc17 100644
--- a/cli/tools/registry/graph.rs
+++ b/cli/tools/registry/graph.rs
@@ -10,7 +10,11 @@ use deno_core::anyhow::bail;
 use deno_core::anyhow::Context;
 use deno_core::error::AnyError;
 use deno_graph::FastCheckDiagnostic;
+use deno_graph::ModuleEntryRef;
 use deno_graph::ModuleGraph;
+use deno_graph::ResolutionResolved;
+use deno_graph::WalkOptions;
+use lsp_types::Url;
 
 use super::diagnostics::PublishDiagnostic;
 use super::diagnostics::PublishDiagnosticsCollector;
@@ -64,6 +68,75 @@ pub fn resolve_config_file_roots_from_exports(
   Ok(exports)
 }
 
+pub fn collect_invalid_external_imports(
+  graph: &ModuleGraph,
+  diagnostics_collector: &PublishDiagnosticsCollector,
+) {
+  let mut visited = HashSet::new();
+  let mut skip_specifiers: HashSet<Url> = HashSet::new();
+
+  let mut collect_if_invalid =
+    |skip_specifiers: &mut HashSet<Url>, resolution: &ResolutionResolved| {
+      if visited.insert(resolution.specifier.clone()) {
+        match resolution.specifier.scheme() {
+          "file" | "data" => {}
+          "jsr" | "npm" => {
+            skip_specifiers.insert(resolution.specifier.clone());
+          }
+          "http" | "https" => {
+            skip_specifiers.insert(resolution.specifier.clone());
+            diagnostics_collector.push(
+              PublishDiagnostic::InvalidExternalImport {
+                kind: format!("non-JSR '{}'", resolution.specifier.scheme()),
+                imported: resolution.specifier.clone(),
+                referrer: resolution.range.clone(),
+              },
+            );
+          }
+          _ => {
+            skip_specifiers.insert(resolution.specifier.clone());
+            diagnostics_collector.push(
+              PublishDiagnostic::InvalidExternalImport {
+                kind: format!("'{}'", resolution.specifier.scheme()),
+                imported: resolution.specifier.clone(),
+                referrer: resolution.range.clone(),
+              },
+            );
+          }
+        }
+      }
+    };
+
+  let options = WalkOptions {
+    check_js: true,
+    follow_dynamic: true,
+    follow_type_only: true,
+  };
+  let mut iter = graph.walk(&graph.roots, options);
+  while let Some((specifier, entry)) = iter.next() {
+    if skip_specifiers.contains(specifier) {
+      iter.skip_previous_dependencies();
+      continue;
+    }
+
+    let ModuleEntryRef::Module(module) = entry else {
+      continue;
+    };
+    let Some(module) = module.esm() else {
+      continue;
+    };
+
+    for (_, dep) in &module.dependencies {
+      if let Some(resolved) = dep.maybe_code.ok() {
+        collect_if_invalid(&mut skip_specifiers, resolved);
+      }
+      if let Some(resolved) = dep.maybe_type.ok() {
+        collect_if_invalid(&mut skip_specifiers, resolved);
+      }
+    }
+  }
+}
+
 /// Collects diagnostics from the module graph for the given packages.
 /// Returns true if any diagnostics were collected.
 pub fn collect_fast_check_type_graph_diagnostics(