feat(lsp): respect editor indentation options (#24181)

cli/lsp/language_server.rs

@@ -1331,12 +1331,14 @@ impl Inner {
 
     // spawn a blocking task to allow doing other work while this is occurring
     let text_edits = deno_core::unsync::spawn_blocking({
-      let fmt_options = self
+      let mut fmt_options = self
         .config
         .tree
         .fmt_options_for_specifier(&specifier)
         .options
         .clone();
+      fmt_options.use_tabs = Some(!params.options.insert_spaces);
+      fmt_options.indent_width = Some(params.options.tab_size as u8);
       let document = document.clone();
       move || {
         let format_result = match document.maybe_parsed_source() {

tests/integration/lsp_tests.rs

@@ -9802,6 +9802,67 @@ fn lsp_format_json() {
   client.shutdown();
 }
 
+#[test]
+fn lsp_format_editor_options() {
+  let context = TestContextBuilder::new().use_temp_cwd().build();
+  let temp_dir = context.temp_dir();
+  let file = source_file(
+    temp_dir.path().join("file.ts"),
+    "if (true) {\n  console.log();\n}\n",
+  );
+  let mut client = context.new_lsp_command().build();
+  client.initialize_default();
+  let res = client.write_request(
+    "textDocument/formatting",
+    json!({
+      "textDocument": {
+        "uri": file.uri(),
+      },
+      "options": {
+        "tabSize": 4,
+        "insertSpaces": true,
+      },
+    }),
+  );
+  assert_eq!(
+    res,
+    json!([
+      {
+        "range": {
+          "start": { "line": 1, "character": 0 },
+          "end": { "line": 1, "character": 0 },
+        },
+        "newText": "  ",
+      },
+    ])
+  );
+  let res = client.write_request(
+    "textDocument/formatting",
+    json!({
+      "textDocument": {
+        "uri": file.uri(),
+      },
+      "options": {
+        "tabSize": 2,
+        "insertSpaces": false,
+      },
+    }),
+  );
+  assert_eq!(
+    res,
+    json!([
+      {
+        "range": {
+          "start": { "line": 1, "character": 0 },
+          "end": { "line": 1, "character": 2 },
+        },
+        "newText": "\t",
+      },
+    ])
+  );
+  client.shutdown();
+}
+
 #[test]
 fn lsp_json_no_diagnostics() {
   let context = TestContextBuilder::new().use_temp_cwd().build();
@@ -9964,7 +10025,7 @@ fn lsp_format_with_config() {
       },
       "options": {
         "tabSize": 2,
-        "insertSpaces": true
+        "insertSpaces": false
       }
     }),
   );