fix(lsp): show related information for tsc diagnostics (#20654)

cli/lsp/diagnostics.rs

@@ -646,10 +646,10 @@ fn to_lsp_related_information(
     related
       .iter()
       .filter_map(|ri| {
-        if let (Some(source), Some(start), Some(end)) =
+        if let (Some(file_name), Some(start), Some(end)) =
-          (&ri.source, &ri.start, &ri.end)
+          (&ri.file_name, &ri.start, &ri.end)
         {
-          let uri = lsp::Url::parse(source).unwrap();
+          let uri = lsp::Url::parse(file_name).unwrap();
           Some(lsp::DiagnosticRelatedInformation {
             location: lsp::Location {
               uri,

cli/tests/integration/lsp_tests.rs

@@ -7351,7 +7351,24 @@ fn lsp_diagnostics_deprecated() {
           "code": 6385,
           "source": "deno-ts",
           "message": "'a' is deprecated.",
-          "relatedInformation": [],
+          "relatedInformation": [
+            {
+              "location": {
+                "uri": "file:///a/file.ts",
+                "range": {
+                  "start": {
+                    "line": 0,
+                    "character": 4,
+                  },
+                  "end": {
+                    "line": 0,
+                    "character": 16,
+                  },
+                },
+              },
+              "message": "The declaration was marked as deprecated here.",
+            },
+          ],
           "tags": [2]
         }
       ],