Emit type definitions with cjs format

- Currently there is no difference between emitting type definitions with `cjs` or `esm` format, the only difference is the file extension. So we emit the type definitions with a `cjs` format to preserve the previous `.d.ts` extension as opposed to the new `.d.mts` extension.

package.json

@@ -4,11 +4,11 @@
   "description": "Selectors for Redux.",
   "main": "./dist/cjs/index.js",
   "module": "./dist/reselect.legacy-esm.js",
-  "types": "./dist/reselect.d.mts",
+  "types": "./dist/reselect.d.ts",
   "exports": {
     "./package.json": "./package.json",
     ".": {
-      "types": "./dist/reselect.d.mts",
+      "types": "./dist/reselect.d.ts",
       "import": "./dist/reselect.mjs",
       "default": "./dist/cjs/index.js"
     }

tsup.config.ts

@@ -32,8 +32,7 @@ export default defineConfig((options): Options[] => {
       name: 'Modern ESM',
       target: ['esnext'],
       format: ['esm'],
-      outExtension: () => ({ js: '.mjs' }),
-      dts: true
+      outExtension: () => ({ js: '.mjs' })
     },
 
     // Support Webpack 4 by pointing `"module"` to a file with a `.js` extension
@@ -93,6 +92,12 @@ export default defineConfig((options): Options[] => {
       onSuccess: async () => {
         await writeCommonJSEntry()
       }
+    },
+    {
+      ...commonOptions,
+      name: 'Type definitions',
+      format: ['cjs'],
+      dts: { only: true }
     }
   ]
 })