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, 14 insertions, 0 deletions

diff --git a/cli/tools/registry/api.rs b/cli/tools/registry/api.rs
index b8eb6c18e..de9b4a333 100644
--- a/cli/tools/registry/api.rs
+++ b/cli/tools/registry/api.rs
@@ -3,6 +3,7 @@
 use deno_core::error::AnyError;
 use deno_core::serde_json;
 use deno_runtime::deno_fetch::reqwest;
+use lsp_types::Url;
 use serde::de::DeserializeOwned;
 
 #[derive(serde::Deserialize)]
@@ -142,3 +143,16 @@ pub async fn get_package(
   let response = client.get(&package_url).send().await?;
   Ok(response)
 }
+
+pub fn get_jsr_alternative(imported: &Url) -> Option<String> {
+  if !matches!(imported.host_str(), Some("esm.sh")) {
+    return None;
+  }
+
+  let mut segments = imported.path_segments().unwrap();
+  match segments.next() {
+    Some("gh") => None,
+    Some(module) => Some(format!("\"npm:{module}\"")),
+    None => None,
+  }
+}