Replace type assertions with CollectionSlug for better type safety

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@xtr-dev/payload-mailing",
-  "version": "0.4.17",
+  "version": "0.4.21",
   "description": "Template-based email system with scheduling and job processing for PayloadCMS",
   "type": "module",
   "main": "dist/index.js",

src/collections/Emails.ts

@@ -206,7 +206,7 @@ const Emails: CollectionConfig = {
         readOnly: true,
       },
       filterOptions: ({ id }) => {
-        const emailId = resolveID({ id })
+        const emailId = resolveID(id)
         return {
           'input.emailId': {
             equals: emailId ? String(emailId) : '',

src/sendEmail.ts

@@ -1,5 +1,5 @@
 import { Payload } from 'payload'
-import { getMailing, renderTemplate, parseAndValidateEmails, sanitizeFromName } from './utils/helpers.js'
+import { getMailing, renderTemplateWithId, parseAndValidateEmails, sanitizeFromName } from './utils/helpers.js'
 import { BaseEmailDocument } from './types/index.js'
 import { processJobById } from './utils/emailProcessor.js'
 import { createContextLogger } from './utils/logger.js'
@@ -50,7 +50,8 @@ export const sendEmail = async <TEmail extends BaseEmailDocument = BaseEmailDocu
   let emailData: Partial<TEmail> = { ...options.data } as Partial<TEmail>
 
   if (options.template) {
-    const { html, text, subject } = await renderTemplate(
+    // Look up and render the template in a single operation to avoid duplicate lookups
+    const { html, text, subject, templateId } = await renderTemplateWithId(
       payload,
       options.template.slug,
       options.template.variables || {}
@@ -58,6 +59,7 @@ export const sendEmail = async <TEmail extends BaseEmailDocument = BaseEmailDocu
 
     emailData = {
       ...emailData,
+      template: templateId,
       subject,
       html,
       text,

src/services/MailingService.ts

@@ -1,10 +1,10 @@
-import { Payload } from 'payload'
+import {CollectionSlug, EmailAdapter, Payload, SendEmailOptions} from 'payload'
 import { Liquid } from 'liquidjs'
 import {
   MailingPluginConfig,
   TemplateVariables,
   MailingService as IMailingService,
-  BaseEmail, BaseEmailTemplate, BaseEmailDocument, BaseEmailTemplateDocument
+  BaseEmailDocument, BaseEmailTemplateDocument
 } from '../types/index.js'
 import { serializeRichTextToHTML, serializeRichTextToText } from '../utils/richTextSerializer.js'
 import { sanitizeDisplayName } from '../utils/helpers.js'
@@ -12,7 +12,6 @@ import { sanitizeDisplayName } from '../utils/helpers.js'
 export class MailingService implements IMailingService {
   public payload: Payload
   private config: MailingPluginConfig
-  private emailAdapter: any
   private templatesCollection: string
   private emailsCollection: string
   private liquid: Liquid | null | false = null
@@ -31,14 +30,13 @@ export class MailingService implements IMailingService {
     if (!this.payload.email) {
       throw new Error('Payload email configuration is required. Please configure email in your Payload config.')
     }
-    this.emailAdapter = this.payload.email
   }
 
   private ensureInitialized(): void {
     if (!this.payload || !this.payload.db) {
       throw new Error('MailingService payload not properly initialized')
     }
-    if (!this.emailAdapter) {
+    if (!this.payload.email) {
       throw new Error('Email adapter not configured. Please ensure Payload has email configured.')
     }
   }
@@ -127,6 +125,17 @@ export class MailingService implements IMailingService {
       throw new Error(`Email template not found: ${templateSlug}`)
     }
 
+    return this.renderTemplateDocument(template, variables)
+  }
+
+  /**
+   * Render a template document (for when you already have the template loaded)
+   * This avoids duplicate template lookups
+   * @internal
+   */
+  async renderTemplateDocument(template: BaseEmailTemplateDocument, variables: TemplateVariables): Promise<{ html: string; text: string; subject: string }> {
+    this.ensureInitialized()
+
     const emailContent = await this.renderEmailTemplate(template, variables)
     const subject = await this.renderTemplateString(template.subject || '', variables)
 
@@ -142,7 +151,7 @@ export class MailingService implements IMailingService {
     const currentTime = new Date().toISOString()
 
     const { docs: pendingEmails } = await this.payload.find({
-      collection: this.emailsCollection as any,
+      collection: this.emailsCollection as CollectionSlug,
       where: {
         and: [
           {
@@ -182,7 +191,7 @@ export class MailingService implements IMailingService {
     const retryTime = new Date(Date.now() - retryDelay).toISOString()
 
     const { docs: failedEmails } = await this.payload.find({
-      collection: this.emailsCollection as any,
+      collection: this.emailsCollection as CollectionSlug,
       where: {
         and: [
           {
@@ -222,7 +231,7 @@ export class MailingService implements IMailingService {
   async processEmailItem(emailId: string): Promise<void> {
     try {
       await this.payload.update({
-        collection: this.emailsCollection as any,
+        collection: this.emailsCollection as CollectionSlug,
         id: emailId,
         data: {
           status: 'processing',
@@ -231,7 +240,7 @@ export class MailingService implements IMailingService {
       })
 
       const email = await this.payload.findByID({
-        collection: this.emailsCollection as any,
+        collection: this.emailsCollection as CollectionSlug,
         id: emailId,
         depth: 1,
       }) as BaseEmailDocument
@@ -244,7 +253,7 @@ export class MailingService implements IMailingService {
         fromField = this.getDefaultFrom()
       }
 
-      let mailOptions: any = {
+      let mailOptions: SendEmailOptions = {
         from: fromField,
         to: email.to,
         cc: email.cc || undefined,
@@ -255,6 +264,19 @@ export class MailingService implements IMailingService {
         text: email.text || undefined,
       }
 
+      if (!mailOptions.from) {
+        throw new Error('Email from field is required')
+      }
+      if (!mailOptions.to || (Array.isArray(mailOptions.to) && mailOptions.to.length === 0)) {
+        throw new Error('Email to field is required')
+      }
+      if (!mailOptions.subject) {
+        throw new Error('Email subject is required')
+      }
+      if (!mailOptions.html && !mailOptions.text) {
+        throw new Error('Email content is required')
+      }
+
       // Call beforeSend hook if configured
       if (this.config.beforeSend) {
         try {
@@ -280,10 +302,10 @@ export class MailingService implements IMailingService {
       }
 
       // Send email using Payload's email adapter
-      await this.emailAdapter.sendEmail(mailOptions)
+      await this.payload.email.sendEmail(mailOptions)
 
       await this.payload.update({
-        collection: this.emailsCollection as any,
+        collection: this.emailsCollection as CollectionSlug,
         id: emailId,
         data: {
           status: 'sent',
@@ -297,7 +319,7 @@ export class MailingService implements IMailingService {
       const maxAttempts = this.config.retryAttempts || 3
 
       await this.payload.update({
-        collection: this.emailsCollection as any,
+        collection: this.emailsCollection as CollectionSlug,
         id: emailId,
         data: {
           status: attempts >= maxAttempts ? 'failed' : 'pending',
@@ -314,14 +336,14 @@ export class MailingService implements IMailingService {
 
   private async incrementAttempts(emailId: string): Promise<number> {
     const email = await this.payload.findByID({
-      collection: this.emailsCollection as any,
+      collection: this.emailsCollection as CollectionSlug,
       id: emailId,
     })
 
     const newAttempts = ((email as any).attempts || 0) + 1
 
     await this.payload.update({
-      collection: this.emailsCollection as any,
+      collection: this.emailsCollection as CollectionSlug,
       id: emailId,
       data: {
         attempts: newAttempts,

src/types/index.ts

@@ -1,4 +1,4 @@
-import { Payload } from 'payload'
+import {Payload, SendEmailOptions} from 'payload'
 import type { CollectionConfig, RichTextField } from 'payload'
 
 // Payload ID type (string or number)
@@ -46,28 +46,11 @@ export interface BaseEmailTemplateDocument {
   updatedAt?: string | Date | null
 }
 
-export type BaseEmail<TEmail extends BaseEmailDocument = BaseEmailDocument, TEmailTemplate extends BaseEmailTemplateDocument = BaseEmailTemplateDocument> = Omit<TEmail, 'id' | 'template'> & {template: Omit<TEmailTemplate, 'id'> | TEmailTemplate['id'] | undefined | null}
-
-export type BaseEmailTemplate<TEmailTemplate extends BaseEmailTemplateDocument = BaseEmailTemplateDocument> = Omit<TEmailTemplate, 'id'>
-
 export type TemplateRendererHook = (template: string, variables: Record<string, any>) => string | Promise<string>
 
 export type TemplateEngine = 'liquidjs' | 'mustache' | 'simple'
 
-export interface BeforeSendMailOptions {
+export type BeforeSendHook = (options: SendEmailOptions, email: BaseEmailDocument) => SendEmailOptions | Promise<SendEmailOptions>
-  from: string
-  to: string[]
-  cc?: string[]
-  bcc?: string[]
-  replyTo?: string
-  subject: string
-  html: string
-  text?: string
-  attachments?: any[]
-  [key: string]: any
-}
-
-export type BeforeSendHook = (options: BeforeSendMailOptions, email: BaseEmailDocument) => BeforeSendMailOptions | Promise<BeforeSendMailOptions>
 
 export interface JobPollingConfig {
   maxAttempts?: number        // Maximum number of polling attempts (default: 5)

src/utils/helpers.ts

@@ -130,6 +130,53 @@ export const renderTemplate = async (payload: Payload, templateSlug: string, var
   return mailing.service.renderTemplate(templateSlug, variables)
 }
 
+/**
+ * Render a template and return both rendered content and template ID
+ * This is used by sendEmail to avoid duplicate template lookups
+ * @internal
+ */
+export const renderTemplateWithId = async (
+  payload: Payload,
+  templateSlug: string,
+  variables: TemplateVariables
+): Promise<{ html: string; text: string; subject: string; templateId: PayloadID }> => {
+  const mailing = getMailing(payload)
+  const templatesCollection = mailing.config.collections?.templates || 'email-templates'
+
+  // Runtime validation: Ensure the collection exists in Payload
+  if (!payload.collections[templatesCollection]) {
+    throw new Error(
+      `Templates collection '${templatesCollection}' not found. ` +
+      `Available collections: ${Object.keys(payload.collections).join(', ')}`
+    )
+  }
+
+  // Look up the template document once
+  const { docs: templateDocs } = await payload.find({
+    collection: templatesCollection as any,
+    where: {
+      slug: {
+        equals: templateSlug,
+      },
+    },
+    limit: 1,
+  })
+
+  if (!templateDocs || templateDocs.length === 0) {
+    throw new Error(`Template not found: ${templateSlug}`)
+  }
+
+  const templateDoc = templateDocs[0]
+
+  // Render using the document directly to avoid duplicate lookup
+  const rendered = await mailing.service.renderTemplateDocument(templateDoc, variables)
+
+  return {
+    ...rendered,
+    templateId: templateDoc.id,
+  }
+}
+
 export const processEmails = async (payload: Payload): Promise<void> => {
   const mailing = getMailing(payload)
   return mailing.service.processEmails()

src/utils/jobScheduler.ts

@@ -129,7 +129,11 @@ export async function updateEmailJobRelationship(
       id: normalizedEmailId,
     })
 
-    const currentJobs = (currentEmail.jobs || []).map((job: any) => String(job))
+    // Extract IDs from job objects or use the value directly if it's already an ID
+    // Jobs can be populated (objects with id field) or just IDs (strings/numbers)
+    const currentJobs = (currentEmail.jobs || []).map((job: any) =>
+      typeof job === 'object' && job !== null && job.id ? String(job.id) : String(job)
+    )
     const allJobs = [...new Set([...currentJobs, ...normalizedJobIds])] // Deduplicate with normalized strings
 
     await payload.update({