Fix AvaTax Bruno collection issue with variables (#1578)

apps/avatax/bruno/checkout/01-create-storefront-user.bru

@@ -48,6 +48,6 @@ body:graphql:vars {
       "channelSlug": "{{channelSlug}}",
       "email": "{{storefrontUserEmail}}",
       "password": "{{storefrontUserPassword}}",
-      "firstName": "{{storefrontUserFirstName}}"
+      "firstName": "{{storefrontUserName}}"
   }
 }

apps/avatax/bruno/checkout/02-create-storefront-token.bru

@@ -29,8 +29,8 @@ body:graphql {
 
 body:graphql:vars {
   {
-      "email": "{{storefrontUserEmail}}",
-      "password": "{{storefrontUserPassword}}"
+    "email": "{{storefrontUserEmail}}",
+    "password": "{{storefrontUserPassword}}"
   }
 }
 

apps/avatax/bruno/collection.bru

@@ -0,0 +1,19 @@
+script:pre-request {
+  // Remove after https://github.com/usebruno/bruno/issues/2960 in done
+  function resolveTemplateVariables(string) {
+    const VARIABLE_NAME_REGEX = /{{([A-Za-z_]\w+)}}/g;
+
+    return string.replace(
+      VARIABLE_NAME_REGEX,
+      (_, key) => bru.getVar(key) || bru.getEnvVar(key)
+    );
+  }
+
+  const body = req.getBody();
+
+  if (!body.variables) {
+    return;
+  }
+
+  body.variables = resolveTemplateVariables(body.variables);
+}