Feat/number count validation (#3)

* feat; adding nodemon as a dev dependency

* feat: input length validation

package.json

@@ -7,21 +7,23 @@
   "scripts": {
     "build": "tsc",
     "test": "jest",
-    "start": "node dist/index.js",
+    "start": "nodemon dist/index.js",
     "prepublishOnly": "npm run build"
   },
-  "dependencies": {},
   "devDependencies": {
     "@types/jest": "^29.0.0",
     "@types/node": "^18.0.0",
     "jest": "^29.0.0",
+    "nodemon": "^3.1.4",
     "ts-jest": "^29.0.0",
     "typescript": "^5.0.0"
   },
   "jest": {
     "preset": "ts-jest",
     "testEnvironment": "node",
-    "testMatch": ["**/?(*.)+(spec|test).ts"]
+    "testMatch": [
+      "**/?(*.)+(spec|test).ts"
+    ]
   },
   "license": "MIT",
   "author": "Hulunlante Worku",
@@ -30,7 +32,7 @@
     "type": "git",
     "url": "git+https://github.com/HuluWZ/phone-formater-eth.git"
   },
-    "bugs": {
+  "bugs": {
     "url": "https://github.com/HuluWZ/phone-formater-eth/issues"
   },
   "keywords": [

src/index.ts

@@ -1,7 +1,10 @@
 export function formatPhone(phone: string) {
   const formatted_phone = phone.replace(/[^+\d]/g, "");
   const phone_length = formatted_phone?.toString().length;
-  if (phone_length === 13 && formatted_phone.startsWith("+251")) {
+  if (phone_length < 9 || phone_length > 13) {
+    return 'INVALID_PHONE_NUMBER'
+  }
+  else if (phone_length === 13 && formatted_phone.startsWith("+251")) {
     return formatted_phone;
   } else if (phone_length === 12 && formatted_phone.startsWith("251")) {
     return `+${formatted_phone}`;