diff --git a/public/common/utils.js b/public/common/utils.js
index d196d511..2a05c467 100644
--- a/public/common/utils.js
+++ b/public/common/utils.js
@@ -3,12 +3,21 @@ import "../components/expandable/expandable.js";
 
 window.activeLegendElement = null;
 
+/**
+ * @param {{x: number, y: number}} location
+ * @param {{x: number, y: number}} pos
+ * @returns {number}
+ */
 export function vec2Distance(location, pos) {
   return Math.sqrt(
     Math.pow(location.x - pos.x, 2) + Math.pow(location.y - pos.y, 2)
   );
 }
 
+/**
+ * @param {string} strWithEmojis
+ * @returns {string[]}
+ */
 export function extractEmojis(strWithEmojis) {
   const segmenter = new Intl.Segmenter("en", {
     granularity: "grapheme"
@@ -62,25 +71,43 @@ export function createDOMElement(kind = "div", options = {}) {
   return el;
 }
 
+/**
+ * @param {string} href
+ * @param {string|null} text
+ * @returns {HTMLAnchorElement}
+ */
 export function createLink(href, text = null) {
   const attributes = {
     rel: "noopener", target: "_blank", href
   };
 
-  return createDOMElement("a", { text, attributes });
+  const htmlAnchor =
+  /** @type {HTMLAnchorElement} */
+    (createDOMElement("a", { text, attributes }));
+
+  return htmlAnchor;
 }
 
+/**
+ * @param {string} spec
+ * @returns {{ name: string, version: string }}
+ */
 export function parseNpmSpec(spec) {
   const parts = spec.split("@");
-  const version = parts.at(-1);
+  const version = parts.at(-1) ?? "";
 
   return spec.startsWith("@") ?
     { name: `@${parts[1]}`, version } :
     { name: parts[0], version };
 }
 
+/**
+ * @param {{url?: string}} repository
+ * @param {string | null} defaultValue
+ * @returns {string | null} return repository url or defaultValue
+ */
 export function parseRepositoryUrl(repository = {}, defaultValue = null) {
-  if (typeof repository !== "object" || !("url" in repository)) {
+  if (!repository || !repository.url || typeof repository !== "object" || !("url" in repository)) {
     return defaultValue;
   }
 
@@ -92,7 +119,7 @@ export function parseRepositoryUrl(repository = {}, defaultValue = null) {
   }
   if (repository.url.startsWith("git@")) {
     const execResult = /git@(?<platform>[a-zA-Z.]+):(?<repo>.+)\.git/gm.exec(repository.url);
-    if (execResult === null) {
+    if (execResult === null || !execResult.groups) {
       return defaultValue;
     }
 
@@ -107,6 +134,12 @@ export function parseRepositoryUrl(repository = {}, defaultValue = null) {
   }
 }
 
+/**
+ * @param {string} title
+ * @param {string} value
+ * @param {Record<string, any>} options
+ * @returns {HTMLElement}
+ */
 export function createLiField(title, value, options = {}) {
   const { isLink = false } = options;
 
@@ -126,12 +159,20 @@ export function createLiField(title, value, options = {}) {
   return liElement;
 }
 
+/**
+ * @param {HTMLElement} node - The parent DOM element.
+ * @param {string[]} items - Array of strings to display.
+ * @param {Object} [options] - Optional configuration options.
+ * @param {Function} [options.onclick] - Callback function (event, item).
+ * @param {boolean} [options.hideItems] - Hide items if needed.
+ * @param {number} [options.hideItemsLength] - Number of visible elements before masking.
+ * @returns {void}
+ */
 export function createItemsList(node, items = [], options = {}) {
   const { onclick = null, hideItems = false, hideItemsLength = 5 } = options;
-
   if (items.length === 0) {
     const previousNode = node.previousElementSibling;
-    if (previousNode !== null) {
+    if (previousNode !== null && previousNode instanceof HTMLElement) {
       previousNode.style.display = "none";
     }
 
@@ -157,8 +198,10 @@ export function createItemsList(node, items = [], options = {}) {
   }
 
   if (hideItems && items.length > hideItemsLength) {
-    const expandableSpan = document.createElement("expandable-span");
-    expandableSpan.onToggle = (expandable) => toggle(expandable, node, hideItemsLength);
+    const expandableSpan =
+    /** @type {import("../components/expandable/expandable.js").ExpandableType} */
+      (document.createElement("expandable-span"));
+    expandableSpan.onToggle = () => toggle(expandableSpan, node, hideItemsLength);
     fragment.appendChild(expandableSpan);
   }
   node.appendChild(fragment);
@@ -168,10 +211,16 @@ export function createItemsList(node, items = [], options = {}) {
 TODO: this util function won't be necessary once the parents of the expandable component will be migrated to lit
 becuase the parents will handle the filtering of their children themselves
 */
+/**
+ * @param {import("../components/expandable/expandable.js").ExpandableType} expandable
+ * @param {HTMLElement} parentNode
+ * @param {number} hideItemsLength
+ * @returns {void}
+ */
 export function toggle(expandable, parentNode, hideItemsLength) {
   expandable.isClosed = !expandable.isClosed;
-  for (let id = 0; id < parentNode.childNodes.length; id++) {
-    const node = parentNode.childNodes[id];
+  for (let id = 0; id < parentNode.children.length; id++) {
+    const node = parentNode.children[id];
     if (node.tagName === "EXPANDABLE-SPAN") {
       continue;
     }
@@ -185,6 +234,10 @@ export function toggle(expandable, parentNode, hideItemsLength) {
   }
 }
 
+/**
+ * @param {string} str
+ * @returns {void}
+ */
 export function copyToClipboard(str) {
   const el = document.createElement("textarea");
   el.value = str;
@@ -192,19 +245,26 @@ export function copyToClipboard(str) {
   el.style.position = "absolute";
   el.style.left = "-9999px";
   document.body.appendChild(el);
-  const selected =
-    document.getSelection().rangeCount > 0
-      ? document.getSelection().getRangeAt(0)
-      : false;
+  const selection = document.getSelection();
+  const selected = selection && selection.rangeCount > 0 ? selection.getRangeAt(0) : false;
   el.select();
   document.execCommand("copy");
   document.body.removeChild(el);
-  if (selected) {
-    document.getSelection().removeAllRanges();
-    document.getSelection().addRange(selected);
+  if (selected && selection) {
+    selection.removeAllRanges();
+    selection.addRange(selected);
   }
 }
 
+/**
+ * @typedef {{reverse?: boolean, blacklist?: Node[], hiddenTarget?: HTMLElement, callback?: () => void}} hideOnClickOutsideOptions
+ */
+
+/**
+ * @param {HTMLElement} element
+ * @param {hideOnClickOutsideOptions} options
+ * @returns {(event: Event) => void}
+ */
 export function hideOnClickOutside(
   element,
   options = {}
@@ -216,8 +276,15 @@ export function hideOnClickOutside(
     callback = () => void 0
   } = options;
 
+  /** @param {Event} event */
   function outsideClickListener(event) {
-    if (!element.contains(event.target) && !blacklist.includes(event.target)) {
+    const target = event.target;
+
+    if (!(target instanceof Node)) {
+      return;
+    }
+
+    if (!element.contains(target) && !blacklist.includes(target)) {
       if (hiddenTarget) {
         if (reverse) {
           hiddenTarget.classList.remove("show");
@@ -240,13 +307,24 @@ export function hideOnClickOutside(
   return outsideClickListener;
 }
 
+/** @returns {string} */
 export function currentLang() {
-  const detectedLang = document.getElementById("lang").dataset.lang;
+  const detectedLang = document.getElementById("lang")?.dataset.lang;
+  const defaultLanguage = "english";
+  if (!detectedLang) {
+    return defaultLanguage;
+  }
 
-  return detectedLang in window.i18n ? detectedLang : "english";
+  return detectedLang in window.i18n ? detectedLang : defaultLanguage;
 }
 
+/**
+ * @param {Function} callback
+ * @param {number} delay
+ * @returns {() => void}
+ */
 export function debounce(callback, delay) {
+  /** @type {ReturnType<typeof setTimeout> | undefined} */
   let timer;
 
   // eslint-disable-next-line func-names
diff --git a/public/components/expandable/expandable.js b/public/components/expandable/expandable.js
index 00a56ef3..e170fe87 100644
--- a/public/components/expandable/expandable.js
+++ b/public/components/expandable/expandable.js
@@ -6,7 +6,17 @@ import { when } from "lit/directives/when.js";
 import { currentLang } from "../../common/utils";
 import "../icon/icon.js";
 
-class Expandable extends LitElement {
+/**
+ * @typedef {Record<string, { home: { showMore: string, showLess: string } }>} I18nLanguage
+ */
+
+/**
+ * "Expandable" web component displaying a toggle button with an icon.
+ * @element expandable-span
+ * @prop {Function} onToggle - Function called during the interaction (default: () => void 0).
+ * @prop {boolean} isClosed - Specifies whether the associated content is hidden (true) or visible (false).
+ */
+export class Expandable extends LitElement {
   static styles = css`
 span.expandable {
   display: flex;
@@ -43,19 +53,24 @@ span.expandable nsecure-icon {
   constructor() {
     super();
     this.isClosed = true;
-    this.onToggle = () => void 0;
+    /** @type {(instance: Expandable) => void} */
+    this.onToggle = () => void {};
   }
 
   render() {
     const lang = currentLang();
+    const i18n =
+      /** @type I18nLanguage */
+      (window.i18n);
+    const translations = i18n[lang].home;
 
     return html`
       <span data-value=${this.isClosed ? "closed" : "opened"}  @click=${this.#handleClick} class="expandable">
         ${when(this.isClosed,
           () => html`<nsecure-icon name="plus"></nsecure-icon>
-        <p>${window.i18n[lang].home.showMore}</p>`,
+        <p>${translations.showMore}</p>`,
           () => html`<nsecure-icon name="minus"></nsecure-icon>
-        <p>${window.i18n[lang].home.showLess}</p>`
+        <p>${translations.showLess}</p>`
         )}
       </span>
 `;
@@ -67,3 +82,6 @@ span.expandable nsecure-icon {
 }
 
 customElements.define("expandable-span", Expandable);
+/**
+* @typedef {import('./expandable.js').Expandable} ExpandableType
+*/