Fix doc printer missing [] around tuple type

cli/doc/printer.rs

@@ -206,14 +206,15 @@ fn render_ts_type(ts_type: doc::ts_type::TsTypeDef) -> String {
     TsTypeDefKind::This => "this".to_string(),
     TsTypeDefKind::Tuple => {
       let tuple = ts_type.tuple.unwrap();
-      let mut output = "".to_string();
+      let mut output = "[".to_string();
       if !tuple.is_empty() {
         for ts_type in tuple {
           output += render_ts_type(ts_type).as_str();
           output += ", "
         }
         output.truncate(output.len() - 2);
       }
+      output += "]";
       output
     }
     TsTypeDefKind::TypeLiteral => {

cli/doc/tests.rs

@@ -1605,3 +1605,20 @@ export namespace Deno {
   let found = find_nodes_by_name_recursively(entries, "a.b.c".to_string());
   assert_eq!(found.len(), 0);
 }
+
+#[tokio::test]
+async fn generic_instantiated_with_tuple_type() {
+  let source_code = r#"
+interface Generic<T> {}
+export function f(): Generic<[string, number]> { return {}; }
+  "#;
+
+  let loader =
+    TestLoader::new(vec![("test.ts".to_string(), source_code.to_string())]);
+  let entries = DocParser::new(loader).parse("test.ts").await.unwrap();
+
+  assert!(colors::strip_ansi_codes(
+    crate::doc::printer::format(entries).as_str()
+  )
+  .contains("Generic<[string, number]>"))
+}