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diff --git a/web/core/modules/locale/src/PluralFormula.php b/web/core/modules/locale/src/PluralFormula.php
new file mode 100644
index 000000000..638d60fac
--- /dev/null
+++ b/web/core/modules/locale/src/PluralFormula.php
@@ -0,0 +1,111 @@
+<?php
+
+namespace Drupal\locale;
+
+use Drupal\Core\Language\LanguageManagerInterface;
+use Drupal\Core\State\StateInterface;
+
+/**
+ * Manages the storage of plural formula per language in state.
+ *
+ * @see \Drupal\locale\PoDatabaseWriter::setHeader()
+ */
+class PluralFormula implements PluralFormulaInterface {
+
+  /**
+   * @var \Drupal\Core\Language\LanguageManagerInterface
+   */
+  protected $languageManager;
+
+  /**
+   * @var \Drupal\Core\State\StateInterface
+   */
+  protected $state;
+
+  /**
+   * The plural formula and count keyed by langcode.
+   *
+   * For example the structure looks like this:
+   * @code
+   * [
+   *   'de' => [
+   *     'plurals' => 2,
+   *     'formula' => [
+   *       // @todo
+   *     ]
+   *   ],
+   * ]
+   * @endcode
+   * @var []
+   */
+  protected $formulae;
+
+  /**
+   * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
+   * @param \Drupal\Core\State\StateInterface $state
+   */
+  public function __construct(LanguageManagerInterface $language_manager, StateInterface $state) {
+    $this->languageManager = $language_manager;
+    $this->state = $state;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setPluralFormula($langcode, $plural_count, array $formula) {
+    // Ensure that the formulae are loaded.
+    $this->loadFormulae();
+
+    $this->formulae[$langcode] = [
+      'plurals' => $plural_count,
+      'formula' => $formula,
+    ];
+    $this->state->set('locale.translation.formulae', $this->formulae);
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getNumberOfPlurals($langcode = NULL) {
+    // Ensure that the formulae are loaded.
+    $this->loadFormulae();
+
+    // Set the langcode to use.
+    $langcode = $langcode ?: $this->languageManager->getCurrentLanguage()->getId();
+
+    // We assume 2 plurals if there is no explicit information yet.
+    if (!isset($this->formulae[$langcode]['plurals'])) {
+      return 2;
+    }
+    return $this->formulae[$langcode]['plurals'];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormula($langcode) {
+    $this->loadFormulae();
+    return isset($this->formulae[$langcode]['formula']) ? $this->formulae[$langcode]['formula'] : FALSE;
+  }
+
+  /**
+   * Loads the formulae and stores them on the PluralFormula object if not set.
+   *
+   * @return array
+   */
+  protected function loadFormulae() {
+    if (!isset($this->formulae)) {
+      $this->formulae = $this->state->get('locale.translation.formulae', []);
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function reset() {
+    $this->formulae = NULL;
+    return $this;
+  }
+
+}