feat(core): add register customer mutation (#641)

.changeset/ten-penguins-tie.md

@@ -0,0 +1,5 @@
+---
+"@bigcommerce/catalyst-core": patch
+---
+
+add register customer mutation

apps/core/client/mutations/register-customer.ts

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+import { client } from '..';
+import { graphql } from '../generated';
+import { RegisterCustomerInput } from '../generated/graphql';
+
+interface RegisterCustomer {
+  formFields: RegisterCustomerInput;
+  reCaptchaToken?: string;
+}
+
+export const REGISTER_CUSTOMER_MUTATION = /* GraphQL */ `
+  mutation registerCustomer($input: RegisterCustomerInput!, $reCaptchaV2: ReCaptchaV2Input) {
+    customer {
+      registerCustomer(input: $input, reCaptchaV2: $reCaptchaV2) {
+        customer {
+          firstName
+          lastName
+        }
+        errors {
+          ... on EmailAlreadyInUseError {
+            message
+          }
+          ... on AccountCreationDisabledError {
+            message
+          }
+          ... on CustomerRegistrationError {
+            message
+          }
+          ... on ValidationError {
+            message
+          }
+        }
+      }
+    }
+  }
+`;
+
+export const registerCustomer = async ({ formFields, reCaptchaToken }: RegisterCustomer) => {
+  const mutation = graphql(REGISTER_CUSTOMER_MUTATION);
+
+  const variables = {
+    input: formFields,
+    ...(reCaptchaToken && { reCaptchaV2: { token: reCaptchaToken } }),
+  };
+
+  const response = await client.fetch({
+    document: mutation,
+    variables,
+  });
+
+  return response.data.customer.registerCustomer;
+};