add: getEnvKeyOrThrow & dotenv

Readme.md

@@ -10,14 +10,12 @@ Installation with `npm`:
 
 ```bash
 npm install emmet-sdk-v2
-npm install @types/emmet-sdk-v2 --save-dev
 ```
 
 Installation with `yarn`:
 
 ```bash
 yarn add emmet-sdk-v2
-yarn add @types/emmet-sdk-v2 -D
 ```
 
 ## Library contents

package.json

@@ -1,6 +1,6 @@
 {
   "name": "emmet-sdk-v2",
-  "version": "2.0.2",
+  "version": "2.0.3",
   "description": "An SDK for Emmet.Finance Bridge",
   "main": "index.js",
   "types": "./emmet-sdk-v2/index.d.ts",
@@ -18,6 +18,7 @@
   "author": "[email protected]",
   "license": "ISC",
   "dependencies": {
+    "dotenv": "^16.4.0",
     "viem": "^2.4.0"
   },
   "devDependencies": {

src/utils/index.ts

@@ -1,2 +1,14 @@
 export * from './address';
-export * from './viem';
+export * from './viem';
+
+export function getEnvKeyOrThrow(key: string): string {
+    try {
+        require('dotenv').config();
+        const value = process.env[key];
+        if (value) return value;
+
+    } catch (error:{message:string}|any) {
+        throw new Error(`emmet-sdk-v2 getEnvKeyOrThrow Error: ${error.message}`);
+    }
+    throw new Error(`${key} is missing in the .env.`);
+}