feat: better types definition (#174)

package.json

@@ -3,6 +3,7 @@
   "description": "A simple Node.js wrapper for youtube-dl",
   "homepage": "https://nicedoc.io/microlinkhq/youtube-dl-exec",
   "version": "2.5.0",
+  "types": "src/index.d.ts",
   "main": "src/index.js",
   "author": {
     "email": "[email protected]",
@@ -134,7 +135,8 @@
     "npm-check-updates": "latest",
     "simple-git-hooks": "latest",
     "standard": "latest",
-    "standard-version": "latest"
+    "standard-version": "latest",
+    "tsd": "latest"
   },
   "engines": {
     "node": ">= 14"
@@ -147,7 +149,7 @@
     "clean": "rm -rf node_modules",
     "contributors": "(npx git-authors-cli && npx finepack && git add package.json && git commit -m 'build: contributors' --no-verify) || true",
     "coverage": "nyc report --reporter=text-lcov | coveralls",
-    "lint": "standard",
+    "lint": "standard && tsd",
     "postinstall": "node scripts/postinstall.js",
     "postrelease": "npm run release:tags && npm run release:github && (ci-publish || npm publish --access=public)",
     "preinstall": "node scripts/preinstall.mjs",
@@ -178,5 +180,8 @@
   "simple-git-hooks": {
     "commit-msg": "npx commitlint --edit",
     "pre-commit": "npx nano-staged"
+  },
+  "tsd": {
+    "directory": "test"
   }
 }