Fix function bundle to include MJML source files

src/actions/utils/email/__tests__/templateCompiler.spec.ts

@@ -37,6 +37,11 @@ const importedExampleTemplate = createImportedEmailTemplate(
   exampleTemplateContent
 )
 
+const importedBundleSafeTemplate = createImportedEmailTemplate(
+  'src/actions/utils/email/__fixtures__/missing-from-runtime-bundle.mjml',
+  exampleTemplateContent
+)
+
 describe('compileEmailTemplate', () => {
   it('compiles the moved contact message template from its imported source', async () => {
     const result = await compileEmailTemplate(contactMessageTemplate, {
@@ -111,6 +116,18 @@ describe('compileEmailTemplate', () => {
     expect(result.text).toContain('Urgent message body')
   })
 
+  it('compiles imported template content when the source file is absent at runtime', async () => {
+    const result = await compileEmailTemplate(importedBundleSafeTemplate, {
+      htmlMessage: '<strong>Urgent</strong> message body',
+      items: ['Coffee Beans'],
+      name: 'Alex',
+    })
+
+    expect(result.html).toContain('Hello, Alex!')
+    expect(result.html).toContain('Coffee Beans')
+    expect(result.text).toContain('Urgent message body')
+  })
+
   it('throws ActionsFunctionError when MJML compilation reports errors', async () => {
     await expect(compileEmailTemplate(invalidTemplate)).rejects.toMatchObject({
       appCode: 'EMAIL_TEMPLATE_COMPILE_FAILED',

src/actions/utils/email/templateCompiler.ts

@@ -1,3 +1,4 @@
+import { existsSync } from 'node:fs'
 import { isAbsolute, relative, resolve } from 'node:path'
 import { fileURLToPath } from 'node:url'
 import { convert } from 'html-to-text'
@@ -218,6 +219,22 @@ export const createEmailTemplate = (
   }
 }
 
+const createMjmlRenderOptions = (absolutePath: string): {
+  filePath?: string
+  keepComments: boolean
+} => {
+  if (!existsSync(absolutePath)) {
+    return {
+      keepComments: false,
+    }
+  }
+
+  return {
+    filePath: absolutePath,
+    keepComments: false,
+  }
+}
+
 const createPlainText = (html: string): string =>
   convert(html, {
     wordwrap: 130,
@@ -249,10 +266,10 @@ export async function compileEmailTemplate(
     const mjml2html = (
       'default' in mjmlModule ? mjmlModule.default : mjmlModule
     ) as MjmlRenderer
-    const { html, errors } = await mjml2html(mjmlWithData, {
-      filePath: absolutePath,
-      keepComments: false,
-    })
+    const { html, errors } = await mjml2html(
+      mjmlWithData,
+      createMjmlRenderOptions(absolutePath)
+    )
 
     if (errors.length > 0) {
       throw new ActionsFunctionError({