feat: Add support for custom email recipients in workflow steps

packages/types/src/index.ts

@@ -26,3 +26,6 @@ export * from './segments/index.js';
 
 // Security types
 export * from './security/index.js';
+
+// Workflow types
+export * from './workflows/index.js';

packages/types/src/workflows/index.ts

@@ -0,0 +1,33 @@
+/**
+ * Workflow-specific type definitions
+ */
+
+/**
+ * Recipient type for workflow email steps
+ */
+export enum EmailRecipientType {
+  /** Send to the contact that triggered the workflow */
+  CONTACT = 'CONTACT',
+  /** Send to a custom email address */
+  CUSTOM = 'CUSTOM',
+}
+
+/**
+ * Configuration for email recipient in SEND_EMAIL workflow step
+ */
+export interface EmailRecipientConfig {
+  /** Type of recipient */
+  type: EmailRecipientType;
+  /** Custom email address (required when type is CUSTOM) */
+  customEmail?: string;
+}
+
+/**
+ * Configuration for SEND_EMAIL workflow step
+ */
+export interface SendEmailStepConfig {
+  /** Template ID to use for the email */
+  templateId: string;
+  /** Recipient configuration */
+  recipient?: EmailRecipientConfig;
+}