Add declaration maps

Author: wooorm

.gitignore

@@ -1,4 +1,5 @@
 .DS_Store
+*.d.ts.map
 *.d.ts
 *.log
 coverage/

package.json

@@ -30,6 +30,7 @@
   "exports": "./index.js",
   "files": [
     "lib/",
+    "index.d.ts.map",
     "index.d.ts",
     "index.js"
   ],

tsconfig.json

@@ -3,6 +3,7 @@
     "checkJs": true,
     "customConditions": ["development"],
     "declaration": true,
+    "declarationMap": true,
     "emitDeclarationOnly": true,
     "exactOptionalPropertyTypes": true,
     "lib": ["es2022"],