Improved calculating version hash for the js-translation.json file.

app/code/Magento/Translation/Block/Js.php

@@ -68,4 +68,14 @@ public function getTranslationFilePath()
     {
         return $this->fileManager->getTranslationFilePath();
     }
+
+    /**
+     * Gets current version of the translation file.
+     *
+     * @return string
+     */
+    public function getTranslationFileVersion()
+    {
+        return $this->fileManager->getTranslationFileVersion();
+    }
 }

app/code/Magento/Translation/Model/FileManager.php

@@ -6,6 +6,8 @@
 namespace Magento\Translation\Model;
 
 use Magento\Framework\App\Filesystem\DirectoryList;
+use Magento\Framework\App\ObjectManager;
+use Magento\Translation\Model\Inline\File as TranslationFile;
 
 /**
  * A service for handling Translation config files
@@ -32,19 +34,27 @@ class FileManager
      */
     private $driverFile;
 
+    /**
+     * @var TranslationFile
+     */
+    private $translationFile;
+
     /**
      * @param \Magento\Framework\View\Asset\Repository $assetRepo
-     * @param \Magento\Framework\App\Filesystem\DirectoryList $directoryList,
-     * @param \Magento\Framework\Filesystem\Driver\File $driverFile,
+     * @param \Magento\Framework\App\Filesystem\DirectoryList $directoryList
+     * @param \Magento\Framework\Filesystem\Driver\File $driverFile
+     * @param TranslationFile $translationFile
      */
     public function __construct(
         \Magento\Framework\View\Asset\Repository $assetRepo,
         \Magento\Framework\App\Filesystem\DirectoryList $directoryList,
-        \Magento\Framework\Filesystem\Driver\File $driverFile
+        \Magento\Framework\Filesystem\Driver\File $driverFile,
+        \Magento\Translation\Model\Inline\File $translationFile = null
     ) {
         $this->assetRepo = $assetRepo;
         $this->directoryList = $directoryList;
         $this->driverFile = $driverFile;
+        $this->translationFile = $translationFile ?: ObjectManager::getInstance()->get(TranslationFile::class);
     }
 
     /**
@@ -110,4 +120,20 @@ public function updateTranslationFileContent($content)
         }
         $this->driverFile->filePutContents($this->getTranslationFileFullPath(), $content);
     }
+
+    /**
+     * Calculate translation file version hash.
+     *
+     * @return string
+     */
+    public function getTranslationFileVersion()
+    {
+        $translationFile = $this->getTranslationFileFullPath();
+        if (!$this->driverFile->isExists($translationFile)) {
+            $this->updateTranslationFileContent($this->translationFile->getTranslationFileContent());
+        }
+
+        $translationFileHash = sha1_file($translationFile);
+        return sha1($translationFileHash . $this->getTranslationFilePath());
+    }
 }

app/code/Magento/Translation/Model/Inline/File.php

@@ -0,0 +1,60 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+namespace Magento\Translation\Model\Inline;
+
+use Magento\Framework\Translate\ResourceInterface;
+use Magento\Framework\Locale\ResolverInterface;
+use Magento\Framework\Serialize\Serializer\Json;
+
+/**
+ * Prepares content of inline translations file.
+ */
+class File
+{
+    /**
+     * @var ResourceInterface
+     */
+    private $translateResource;
+
+    /**
+     * @var ResolverInterface
+     */
+    private $localeResolver;
+
+    /**
+     * @var Json
+     */
+    private $jsonSerializer;
+
+    /**
+     * Initialize dependencies
+     *
+     * @param ResourceInterface $translateResource
+     * @param ResolverInterface $localeResolver
+     * @param Json $jsonSerializer
+     */
+    public function __construct(
+        ResourceInterface $translateResource,
+        ResolverInterface $localeResolver,
+        Json $jsonSerializer
+    ) {
+        $this->translateResource = $translateResource;
+        $this->localeResolver = $localeResolver;
+        $this->jsonSerializer = $jsonSerializer;
+    }
+
+    /**
+     * Generate translation file content for the current locale.
+     *
+     * @return string
+     */
+    public function getTranslationFileContent()
+    {
+        $translations = $this->translateResource->getTranslationArray(null, $this->localeResolver->getLocale());
+        $translations = $this->jsonSerializer->serialize($translations);
+        return $translations;
+    }
+}

app/code/Magento/Translation/Test/Unit/Block/JsTest.php

@@ -65,4 +65,14 @@ public function testGetTranslationFilePath()
             ->willReturn('frontend/Magento/luma/en_EN');
         $this->assertEquals('frontend/Magento/luma/en_EN', $this->model->getTranslationFilePath());
     }
+
+    public function testGetTranslationFileVersion()
+    {
+        $version = sha1('translationFile');
+
+        $this->fileManagerMock->expects($this->once())
+            ->method('getTranslationFileVersion')
+            ->willReturn($version);
+        $this->assertEquals($version, $this->model->getTranslationFileVersion());
+    }
 }

app/code/Magento/Translation/Test/Unit/Model/Inline/FileTest.php

@@ -0,0 +1,60 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+namespace Magento\Translation\Test\Unit\Model\Inline;
+
+class FileTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @var \Magento\Translation\Model\Inline\File
+     */
+    private $model;
+
+    /**
+     * @var \Magento\Framework\Translate\ResourceInterface|\PHPUnit_Framework_MockObject_MockObject
+     */
+    private $translateResourceMock;
+
+    /**
+     * @var \Magento\Framework\Locale\ResolverInterface|\PHPUnit_Framework_MockObject_MockObject
+     */
+    private $localeResolverMock;
+
+    /**
+     * @var \Magento\Framework\Serialize\Serializer\Json
+     */
+    private $jsonSerializer;
+
+    protected function setUp()
+    {
+        $this->translateResourceMock = $this->getMockBuilder(\Magento\Framework\Translate\ResourceInterface::class)
+            ->disableOriginalConstructor()
+            ->getMock();
+        $this->localeResolverMock = $this->getMockBuilder(\Magento\Framework\Locale\ResolverInterface::class)
+            ->disableOriginalConstructor()
+            ->getMock();
+        $this->jsonSerializer = new \Magento\Framework\Serialize\Serializer\Json();
+
+        $this->model = new \Magento\Translation\Model\Inline\File(
+            $this->translateResourceMock,
+            $this->localeResolverMock,
+            $this->jsonSerializer
+        );
+    }
+
+    public function testGetTranslationFileContent()
+    {
+        $translations = ['string' => 'translatedString'];
+
+        $this->localeResolverMock->expects($this->atLeastOnce())->method('getLocale')->willReturn('en_US');
+        $this->translateResourceMock->expects($this->atLeastOnce())->method('getTranslationArray')
+            ->willReturn($translations);
+
+        $this->assertEquals(
+            $this->jsonSerializer->serialize($translations),
+            $this->model->getTranslationFileContent()
+        );
+    }
+}

app/code/Magento/Translation/view/base/templates/translate.phtml

@@ -26,7 +26,7 @@
                 $.initNamespaceStorage('mage-translation-file-version');
                 versionObj = $.localStorage.get('mage-translation-file-version');
 
-                <?php $version = sha1($block->getTranslationFileTimestamp() . $block->getTranslationFilePath()); ?>
+                <?php $version = $block->getTranslationFileVersion(); ?>
 
                 if (versionObj.version !== '<?= /* @noEscape */ $version ?>') {
                     dependencies.push(