feat(lsp): node specifier completions (#24904)

cli/lsp/completions.rs

@@ -18,6 +18,7 @@ use crate::util::path::is_importable_ext;
 use crate::util::path::relative_specifier;
 use deno_graph::source::ResolutionMode;
 use deno_graph::Range;
+use deno_runtime::deno_node::SUPPORTED_BUILTIN_NODE_MODULES;
 use deno_runtime::fs_util::specifier_to_file_path;
 
 use deno_ast::LineAndColumnIndex;
@@ -192,6 +193,8 @@ pub async fn get_import_completions(
     get_npm_completions(specifier, &text, &range, npm_search_api).await
   {
     Some(lsp::CompletionResponse::List(completion_list))
+  } else if let Some(completion_list) = get_node_completions(&text, &range) {
+    Some(lsp::CompletionResponse::List(completion_list))
   } else if let Some(completion_list) =
     get_import_map_completions(specifier, &text, &range, maybe_import_map)
   {
@@ -732,6 +735,40 @@ async fn get_npm_completions(
   })
 }
 
+/// Get completions for `node:` specifiers.
+fn get_node_completions(
+  specifier: &str,
+  range: &lsp::Range,
+) -> Option<CompletionList> {
+  if !specifier.starts_with("node:") {
+    return None;
+  }
+  let items = SUPPORTED_BUILTIN_NODE_MODULES
+    .iter()
+    .map(|name| {
+      let specifier = format!("node:{}", name);
+      let text_edit = Some(lsp::CompletionTextEdit::Edit(lsp::TextEdit {
+        range: *range,
+        new_text: specifier.clone(),
+      }));
+      lsp::CompletionItem {
+        label: specifier,
+        kind: Some(lsp::CompletionItemKind::FILE),
+        detail: Some("(node)".to_string()),
+        text_edit,
+        commit_characters: Some(
+          IMPORT_COMMIT_CHARS.iter().map(|&c| c.into()).collect(),
+        ),
+        ..Default::default()
+      }
+    })
+    .collect();
+  Some(CompletionList {
+    is_incomplete: false,
+    items,
+  })
+}
+
 /// Get workspace completions that include modules in the Deno cache which match
 /// the current specifier string.
 fn get_workspace_completions(

tests/integration/lsp_tests.rs

@@ -7498,6 +7498,111 @@ fn lsp_npm_completions_auto_import_and_quick_fix_no_import_map() {
   client.shutdown();
 }
 
+#[test]
+fn lsp_completions_node_specifier() {
+  let context = TestContextBuilder::new().use_temp_cwd().build();
+  let temp_dir = context.temp_dir();
+  let mut client = context.new_lsp_command().build();
+  client.initialize_default();
+  client.did_open(json!({
+    "textDocument": {
+      "uri": temp_dir.uri().join("file.ts").unwrap(),
+      "languageId": "typescript",
+      "version": 1,
+      "text": "import fs from \"node:as\";\n",
+    },
+  }));
+  let list = client.get_completion_list(
+    temp_dir.uri().join("file.ts").unwrap(),
+    (0, 23),
+    json!({
+      "triggerKind": 2,
+      "triggerCharacter": ".",
+    }),
+  );
+  assert!(!list.is_incomplete);
+  assert_eq!(
+    list
+      .items
+      .iter()
+      .map(|i| i.label.as_str())
+      .collect::<Vec<_>>(),
+    vec![
+      "node:assert",
+      "node:assert/strict",
+      "node:async_hooks",
+      "node:buffer",
+      "node:child_process",
+      "node:cluster",
+      "node:console",
+      "node:constants",
+      "node:crypto",
+      "node:dgram",
+      "node:diagnostics_channel",
+      "node:dns",
+      "node:dns/promises",
+      "node:domain",
+      "node:events",
+      "node:fs",
+      "node:fs/promises",
+      "node:http",
+      "node:http2",
+      "node:https",
+      "node:module",
+      "node:net",
+      "node:os",
+      "node:path",
+      "node:path/posix",
+      "node:path/win32",
+      "node:perf_hooks",
+      "node:process",
+      "node:punycode",
+      "node:querystring",
+      "node:repl",
+      "node:readline",
+      "node:readline/promises",
+      "node:stream",
+      "node:stream/consumers",
+      "node:stream/promises",
+      "node:stream/web",
+      "node:string_decoder",
+      "node:sys",
+      "node:test",
+      "node:timers",
+      "node:timers/promises",
+      "node:tls",
+      "node:tty",
+      "node:url",
+      "node:util",
+      "node:util/types",
+      "node:v8",
+      "node:vm",
+      "node:worker_threads",
+      "node:zlib",
+    ],
+  );
+  for item in &list.items {
+    let specifier = item.label.as_str();
+    assert_eq!(
+      json!(item),
+      json!({
+        "label": specifier,
+        "kind": 17,
+        "detail": "(node)",
+        "textEdit": {
+          "range": {
+            "start": { "line": 0, "character": 16 },
+            "end": { "line": 0, "character": 23 },
+          },
+          "newText": specifier,
+        },
+        "commitCharacters": ["\"", "'"],
+      }),
+    );
+  }
+  client.shutdown();
+}
+
 #[test]
 fn lsp_infer_return_type() {
   let context = TestContextBuilder::new().use_temp_cwd().build();
@@ -8614,7 +8719,7 @@ fn lsp_npm_specifier_unopened_file() {
 }
 
 #[test]
-fn lsp_completions_node_specifier() {
+fn lsp_completions_node_builtin() {
   let context = TestContextBuilder::new()
     .use_http_server()
     .use_temp_cwd()