chore: add tsconfig.json, fix typing issue

Author: devmuffy

src/pesel/index.ts

@@ -23,7 +23,7 @@ export function isValidPesel(pesel: string): boolean {
   return (modulo === 0 && checkDigit === 0) || 10 - modulo === checkDigit;
 }
 
-const MODULO_REMAINDER_TO_CENTURY = {
+const MODULO_REMAINDER_TO_CENTURY: Record<number, number> = {
   0: 1900,
   20: 2000,
   40: 2100,

tsconfig.json

@@ -0,0 +1,10 @@
+{
+  "compilerOptions": {
+    "target": "ESNext",
+    "module": "ESNext",
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "strict": true,
+    "skipLibCheck": true
+  }
+}