Enhance package configuration and type definitions

- Added a new script for type checking in `package.json`.
- Updated the `appendTo` property type in `IScriptProps` to restrict it to 'head' or 'body' in `src/index.ts`.

Author: Olavo Parno

package.json

@@ -28,6 +28,7 @@
   "scripts": {
     "test": "CI=true react-scripts test --env=jsdom || true",
     "test:watch": "react-scripts test --env=jsdom",
+    "typecheck": "tsc --noEmit",
     "prebuild": "rm -rf dist",
     "build": "rollup -c",
     "start": "rollup -c -w",
@@ -39,7 +40,7 @@
     "prepublishOnly": "npm run build"
   },
   "peerDependencies": {
-    "react": "^17.0.2 || ^18"
+    "react": "^17.0.2 || ^18 || ^19"
   },
   "devDependencies": {
     "@babel/core": "^7.17.4",

src/index.ts

@@ -15,7 +15,7 @@ export interface IScriptProps {
   otherProps?: THTMLScriptElementProps;
   startTrigger?: boolean;
   id?: string;
-  appendTo?: string;
+  appendTo?: 'head' | 'body';
   delay?: number;
 }