first commit

media/com_installer/js/changelog.js

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+/**
+ * @copyright   (C) 2019 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+Joomla = window.Joomla || {};
+(Joomla => {
+
+  document.addEventListener('DOMContentLoaded', () => {
+    const modals = document.getElementsByClassName('changelogModal');
+    Array.from(modals).forEach(element => {
+      element.addEventListener('click', modal => {
+        Joomla.loadChangelog(modal.target.dataset.jsExtensionid, modal.target.dataset.jsView);
+      });
+    });
+  });
+
+  /**
+   * Load the changelog data
+   *
+   * @param extensionId The extension ID to load the changelog for
+   * @param view The view the changelog is for,
+   *             this is used to determine which version number to show
+   *
+   * @since   4.0.0
+   */
+  Joomla.loadChangelog = (extensionId, view) => {
+    const modal = document.querySelector(`#changelogModal${extensionId} .modal-body`);
+    Joomla.request({
+      url: `index.php?option=com_installer&task=manage.loadChangelog&eid=${extensionId}&source=${view}&format=json`,
+      onSuccess: response => {
+        let message = '';
+        try {
+          const result = JSON.parse(response);
+          if (result.error) {
+            [message] = result;
+          } else {
+            message = result.data;
+          }
+        } catch (exception) {
+          message = exception;
+        }
+        modal.innerHTML = Joomla.sanitizeHtml(message);
+      },
+      onError: function onError(xhr) {
+        modal.innerHTML = Joomla.sanitizeHtml(xhr.statusText);
+      }
+    });
+  };
+})(Joomla);

media/com_installer/js/changelog.min.js

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+Joomla=window.Joomla||{},(e=>{document.addEventListener("DOMContentLoaded",(()=>{const o=document.getElementsByClassName("changelogModal");Array.from(o).forEach((o=>{o.addEventListener("click",(o=>{e.loadChangelog(o.target.dataset.jsExtensionid,o.target.dataset.jsView)}))}))})),e.loadChangelog=(o,t)=>{const a=document.querySelector(`#changelogModal${o} .modal-body`);e.request({url:`index.php?option=com_installer&task=manage.loadChangelog&eid=${o}&source=${t}&format=json`,onSuccess:o=>{let t="";try{const e=JSON.parse(o);e.error?[t]=e:t=e.data}catch(e){t=e}a.innerHTML=e.sanitizeHtml(t)},onError:function(o){a.innerHTML=e.sanitizeHtml(o.statusText)}})}})(Joomla);

media/com_installer/js/installer.js

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+/**
+ * @copyright   (C) 2018 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+(() => {
+
+  document.addEventListener('DOMContentLoaded', () => {
+    const loading = document.getElementById('loading');
+    const installer = document.getElementById('installer-install');
+    if (loading && installer) {
+      loading.style.position = 'absolute';
+      loading.style.top = 0;
+      loading.style.left = 0;
+      loading.style.width = '100%';
+      loading.style.height = '100%';
+      loading.classList.add('hidden');
+    }
+  });
+})();

media/com_installer/js/installer.min.js

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+document.addEventListener("DOMContentLoaded",(()=>{const t=document.getElementById("loading"),e=document.getElementById("installer-install");t&&e&&(t.style.position="absolute",t.style.top=0,t.style.left=0,t.style.width="100%",t.style.height="100%",t.classList.add("hidden"))}));