2 files changed, 64 insertions, 1 deletions
diff --git a/cli/tests/integration/lsp_tests.rs b/cli/tests/integration/lsp_tests.rs
index 711d0bcd8..9283b4021 100644
--- a/cli/tests/integration/lsp_tests.rs
+++ b/cli/tests/integration/lsp_tests.rs
@@ -10668,3 +10668,55 @@ fn lsp_sloppy_imports_warn() {
 
   client.shutdown();
 }
+
+#[test]
+fn sloppy_imports_not_enabled() {
+  let context = TestContextBuilder::new().use_temp_cwd().build();
+  let temp_dir = context.temp_dir();
+  let temp_dir = temp_dir.path();
+  temp_dir.join("deno.json").write(r#"{}"#);
+  // The enhanced, more helpful error message is only available
+  // when the file exists on the file system at the moment because
+  // it's a little more complicated to hook it up otherwise.
+  temp_dir.join("a.ts").write("export class A {}");
+  let mut client = context.new_lsp_command().build();
+  client.initialize(|builder| {
+    builder.set_root_uri(temp_dir.uri_dir());
+  });
+  let diagnostics = client.did_open(json!({
+    "textDocument": {
+      "uri": temp_dir.join("file.ts").uri_file(),
+      "languageId": "typescript",
+      "version": 1,
+      "text": "import * as a from './a';\nconsole.log(a)\n",
+    },
+  }));
+  assert_eq!(
+    diagnostics.messages_with_source("deno"),
+    lsp::PublishDiagnosticsParams {
+      uri: temp_dir.join("file.ts").uri_file(),
+      diagnostics: vec![lsp::Diagnostic {
+        range: lsp::Range {
+          start: lsp::Position {
+            line: 0,
+            character: 19
+          },
+          end: lsp::Position {
+            line: 0,
+            character: 24
+          }
+        },
+        severity: Some(lsp::DiagnosticSeverity::ERROR),
+        code: Some(lsp::NumberOrString::String("no-local".to_string())),
+        source: Some("deno".to_string()),
+        message: format!(
+          "Unable to load a local module: {}\nMaybe add a '.ts' extension.",
+          temp_dir.join("a").uri_file(),
+        ),
+        ..Default::default()
+      }],
+      version: Some(1),
+    }
+  );
+  client.shutdown();
+}
diff --git a/cli/tests/integration/run_tests.rs b/cli/tests/integration/run_tests.rs
index 4e0bbdfd2..03de97ee7 100644
--- a/cli/tests/integration/run_tests.rs
+++ b/cli/tests/integration/run_tests.rs
@@ -4740,7 +4740,6 @@ itest!(unsafe_proto_flag {
 fn test_unstable_sloppy_imports() {
   let context = TestContextBuilder::new().use_temp_cwd().build();
   let temp_dir = context.temp_dir();
-  temp_dir.write("deno.json", r#"{ "unstable": ["sloppy-imports"] }"#);
   temp_dir.write("a.ts", "export class A {}");
   temp_dir.write("b.js", "export class B {}");
   temp_dir.write("c.mts", "export class C {}");
@@ -4771,6 +4770,18 @@ console.log(g.G);
 "#,
   );
 
+  // run without sloppy imports
+  context
+    .new_command()
+    .args("run main.ts")
+    .run()
+    .assert_matches_text(r#"error: Module not found "file:///[WILDCARD]/a.js". Maybe change the extension to '.ts' or run with --unstable-sloppy-imports
+    at file:///[WILDCARD]/main.ts:1:20
+"#)
+    .assert_exit_code(1);
+
+  // now run with sloppy imports
+  temp_dir.write("deno.json", r#"{ "unstable": ["sloppy-imports"] }"#);
   context
     .new_command()
     .args("run main.ts")