fix: improved support for cjs and cts modules (#26558)

* cts support
* better cjs/cts type checking
* deno compile cjs/cts support
* More efficient detect cjs (going towards stabilization)
* Determination of whether .js, .ts, .jsx, or .tsx is cjs or esm is only
done after loading
* Support `import x = require(...);`

Co-authored-by: Bartek Iwańczuk <biwanczuk@gmail.com>

1 files changed, 28 insertions, 3 deletions

diff --git a/ext/node/polyfills/01_require.js b/ext/node/polyfills/01_require.js
index 7935903a8..296d819aa 100644
--- a/ext/node/polyfills/01_require.js
+++ b/ext/node/polyfills/01_require.js
@@ -1071,13 +1071,35 @@ Module._extensions[".js"] = function (module, filename) {
     } else if (pkg?.type === "commonjs") {
       format = "commonjs";
     }
-  } else if (StringPrototypeEndsWith(filename, ".cjs")) {
-    format = "commonjs";
   }
 
   module._compile(content, filename, format);
 };
 
+Module._extensions[".ts"] =
+  Module._extensions[".jsx"] =
+  Module._extensions[".tsx"] =
+    function (module, filename) {
+      const content = op_require_read_file(filename);
+
+      let format;
+      const pkg = op_require_read_closest_package_json(filename);
+      if (pkg?.type === "module") {
+        format = "module";
+      } else if (pkg?.type === "commonjs") {
+        format = "commonjs";
+      }
+
+      module._compile(content, filename, format);
+    };
+
+Module._extensions[".cjs"] =
+  Module._extensions[".cts"] =
+    function (module, filename) {
+      const content = op_require_read_file(filename);
+      module._compile(content, filename, "commonjs");
+    };
+
 function loadESMFromCJS(module, filename, code) {
   const namespace = op_import_sync(
     url.pathToFileURL(filename).toString(),
@@ -1087,7 +1109,10 @@ function loadESMFromCJS(module, filename, code) {
   module.exports = namespace;
 }
 
-Module._extensions[".mjs"] = function (module, filename) {
+Module._extensions[".mjs"] = Module._extensions[".mts"] = function (
+  module,
+  filename,
+) {
   loadESMFromCJS(module, filename);
 };