Refactor types for env urls (#721)

src/env/config.ts

@@ -1,32 +1,35 @@
 import { createUrl } from 'src/shared/createUrl';
+import { invariant } from 'src/shared/invariant';
 
-const backendUrl = (url: string | undefined, backend_env: string | undefined) => {
+function backendUrl(url: string, backend_env?: string | undefined): string;
+function backendUrl(url: string | undefined, backend_env?: string | undefined): string | undefined;
+function backendUrl(url: string | undefined, backend_env: string | undefined) {
   if (url) {
     return createUrl({
       base: url,
       pathname: '',
       searchParams: backend_env ? { backend_env } : undefined,
     }).toString();
   }
-};
+}
 
 export const BACKEND_ENV = process.env.BACKEND_ENV;
+invariant(process.env.DEFI_SDK_API_TOKEN, 'DEFI_SDK_API_TOKEN is required in env');
 export const DEFI_SDK_API_TOKEN = process.env.DEFI_SDK_API_TOKEN;
+invariant(process.env.DEFI_SDK_API_URL, 'DEFI_SDK_API_URL is required in env');
 export const DEFI_SDK_API_URL = backendUrl(process.env.DEFI_SDK_API_URL, BACKEND_ENV);
+invariant(process.env.DEFI_SDK_TESTNET_API_URL, 'DEFI_SDK_TESTNET_API_URL is required in env');
 export const DEFI_SDK_TESTNET_API_URL = backendUrl(process.env.DEFI_SDK_TESTNET_API_URL, BACKEND_ENV);
+invariant(process.env.ZERION_API_URL, 'ZERION_API_URL is required in env');
 export const ZERION_API_URL = backendUrl(process.env.ZERION_API_URL, BACKEND_ENV);
+invariant(process.env.ZERION_TESTNET_API_URL, 'ZERION_TESTNET_API_URL is required in env');
 export const ZERION_TESTNET_API_URL = backendUrl(process.env.ZERION_TESTNET_API_URL, BACKEND_ENV);
+invariant(process.env.DEFI_SDK_TRANSACTIONS_API_URL, 'DEFI_SDK_TRANSACTIONS_API_URL is required in env');
 export const DEFI_SDK_TRANSACTIONS_API_URL = backendUrl(process.env.DEFI_SDK_TRANSACTIONS_API_URL, BACKEND_ENV);
 
+invariant(process.env.PROXY_URL, 'PROXY_URL is required in env');
 export const PROXY_URL = process.env.PROXY_URL;
 export const SOCIAL_API_URL = process.env.SOCIAL_API_URL;
 export const MIXPANEL_TOKEN_PUBLIC = process.env.MIXPANEL_TOKEN_PUBLIC;
 export const FEATURE_LOYALTY_FLOW = process.env.FEATURE_LOYALTY_FLOW === 'on' ? 'on' : null; // avoid accidental false-positives for truthy "off"
 export const SLOW_MODE = false;
-
-if (!PROXY_URL) {
-  throw new Error('PROXY_URL must be defined in ENV');
-}
-if (!ZERION_API_URL) {
-  throw new Error('ZERION_API_URL must be defined in ENV');
-}