feat(publish): add `npm:` suggestion for esm.sh specifiers (#22343)

![image](https://github.com/denoland/deno/assets/34997667/f32642ed-c109-4519-84c5-6f78e9452703)

Co-authored-by: David Sherret <dsherret@users.noreply.github.com>

1 files changed, 24 insertions, 1 deletions

diff --git a/cli/tools/registry/diagnostics.rs b/cli/tools/registry/diagnostics.rs
index ff86e68fb..9e88e81de 100644
--- a/cli/tools/registry/diagnostics.rs
+++ b/cli/tools/registry/diagnostics.rs
@@ -287,7 +287,30 @@ impl Diagnostic for PublishDiagnostic {
   }
 
   fn snippet_fixed(&self) -> Option<DiagnosticSnippet<'_>> {
-    None
+    match &self {
+      PublishDiagnostic::InvalidExternalImport { imported, .. } => {
+        match super::api::get_jsr_alternative(imported) {
+          Some(replacement) => {
+            let replacement = SourceTextInfo::new(replacement.into());
+            let start = replacement.line_start(0);
+            let end = replacement.line_end(0);
+            Some(DiagnosticSnippet {
+              source: Cow::Owned(replacement),
+              highlight: DiagnosticSnippetHighlight {
+                style: DiagnosticSnippetHighlightStyle::Hint,
+                range: DiagnosticSourceRange {
+                  start: DiagnosticSourcePos::SourcePos(start),
+                  end: DiagnosticSourcePos::SourcePos(end),
+                },
+                description: Some("try this specifier".into()),
+              },
+            })
+          }
+          None => None,
+        }
+      }
+      _ => None,
+    }
   }
 
   fn info(&self) -> Cow<'_, [Cow<'_, str>]> {