fix(doc): stack overflow for .d.ts files (#7167)

cli/main.rs

@@ -545,16 +545,22 @@ async fn doc_command(
 
   let loader = Box::new(global_state.file_fetcher.clone());
   let doc_parser = doc::DocParser::new(loader, private);
-  let media_type = map_file_extension(&PathBuf::from(&source_file));
-  let syntax = swc_util::get_syntax_for_media_type(media_type);
 
   let parse_result = if source_file == "--builtin" {
+    let syntax = swc_util::get_syntax_for_dts();
     doc_parser.parse_source(
       "lib.deno.d.ts",
       syntax,
       get_types(flags.unstable).as_str(),
     )
   } else {
+    let path = PathBuf::from(&source_file);
+    let syntax = if path.ends_with("d.ts") {
+      swc_util::get_syntax_for_dts()
+    } else {
+      let media_type = map_file_extension(&path);
+      swc_util::get_syntax_for_media_type(media_type)
+    };
     let module_specifier =
       ModuleSpecifier::resolve_url_or_path(&source_file).unwrap();
     doc_parser

cli/swc_util.rs

@@ -80,6 +80,12 @@ fn get_default_ts_config() -> TsConfig {
   ts_config
 }
 
+pub fn get_syntax_for_dts() -> Syntax {
+  let mut ts_config = TsConfig::default();
+  ts_config.dts = true;
+  Syntax::Typescript(ts_config)
+}
+
 pub fn get_syntax_for_media_type(media_type: MediaType) -> Syntax {
   match media_type {
     MediaType::JavaScript => Syntax::Es(get_default_es_config()),

cli/tests/deno_doc.out

@@ -0,0 +1,2 @@
+[WILDCARD]
+function foo[WILDCARD]

cli/tests/deno_doc.ts

@@ -0,0 +1,4 @@
+/** Some JSDoc */
+// eslint-disable-next-line @typescript-eslint/explicit-function-return-type
+export function foo() {
+}

cli/tests/deno_doc_builtin.out

@@ -0,0 +1,3 @@
+[WILDCARD]
+namespace Deno
+[WILDCARD]

cli/tests/integration_tests.rs

@@ -2262,6 +2262,16 @@ itest!(deno_lint_glob {
   exit_code: 1,
 });
 
+itest!(deno_doc_builtin {
+  args: "doc",
+  output: "deno_doc_builtin.out",
+});
+
+itest!(deno_doc {
+  args: "doc deno_doc.ts",
+  output: "deno_doc.out",
+});
+
 itest!(compiler_js_error {
   args: "run --unstable compiler_js_error.ts",
   output: "compiler_js_error.ts.out",