add cts file extension, treated identically to ts

index.js

@@ -8,6 +8,9 @@ function endsInJsx(filename) {
 function endsInTs(filename) {
   return filename.endsWith('.ts');
 }
+function endsInCts(filename) {
+  return filename.endsWith('.cts');
+}
 function endsInTsx(filename) {
   return filename.endsWith('.tsx');
 }
@@ -425,6 +428,68 @@ var extensions = {
       },
     },
   ],
+  '.cts': [
+    'ts-node/register',
+    'sucrase/register/ts',
+    {
+      module: '@babel/register',
+      register: function (hook, config) {
+        config = config || {
+          rootMode: 'upward-optional',
+          overrides: [
+            {
+              only: [endsInCts],
+              presets: ['@babel/preset-env', '@babel/preset-typescript'],
+            },
+          ],
+        };
+
+        hook(
+          Object.assign({}, config, {
+            extensions: '.cts',
+          })
+        );
+      },
+    },
+    {
+      module: 'esbuild-register/dist/node',
+      register: function (mod, config) {
+        config = config || {
+          target: 'node' + process.version.slice(1),
+          hookMatcher: endsInTs,
+        };
+
+        mod.register(
+          Object.assign({}, config, {
+            extensions: ['.cts'],
+          })
+        );
+      },
+    },
+    {
+      module: '@swc/register',
+      register: function (hook, config) {
+        config = config || {
+          only: [endsInCts],
+          ignore: [isNodeModules],
+          jsc: {
+            parser: {
+              syntax: 'typescript',
+            },
+          },
+          module: {
+            type: 'commonjs',
+          },
+        };
+
+        hook(
+          Object.assign({}, config, {
+            extensions: '.cts',
+          })
+        );
+      },
+    },
+  ],
   '.tsx': [
     'ts-node/register',
     'sucrase/register/tsx',