add typescirpt support

package.json

@@ -3,13 +3,16 @@
   "version": "2.0.12",
   "description": "This is part of the IFSC toolset released by Razorpay. You can find more details about the entire release at [ifsc.razorpay.com](https://ifsc.razorpay.com). Includes only a validation library as of now.",
   "main": "src/node/index.js",
+  "types": "src/node/index.d.ts",
   "directories": {
     "test": "tests"
   },
   "dependencies": {
     "request": "^2.88.2"
   },
-  "devDependencies": {},
+  "devDependencies": {
+    "typescript": "^5.0.4"
+  },
   "scripts": {
     "test": "node tests/node/validator_test.js && node tests/node/client_test.js && node tests/node/bank_test.js"
   },

src/node/index.d.ts

@@ -0,0 +1,24 @@
+declare module 'ifsc' {
+  export interface IfscDetails {
+    MICR: string;
+    BRANCH: string;
+    ADDRESS: string;
+    STATE: string;
+    CONTACT: string;
+    UPI: boolean;
+    RTGS: boolean;
+    CITY: string;
+    CENTRE: string;
+    DISTRICT: string;
+    NEFT: boolean;
+    IMPS: boolean;
+    SWIFT: string;
+    BANK: string;
+    BANKCODE: string;
+    IFSC: string;
+  }
+
+  export function validate(ifscCode: string): boolean;
+
+  export function fetchDetails(ifscCode: string): Promise<IfscDetails>;
+}

tsconfig.json

@@ -0,0 +1,11 @@
+{
+  "compilerOptions": {
+    "declaration": true,
+    "outDir": "dist",
+    "module": "commonjs",
+    "target": "es6"
+  },
+  "include": [
+    "src/node/*"
+  ]
+}