diff --git a/.changeset/fifty-jars-sing.md b/.changeset/fifty-jars-sing.md
new file mode 100644
index 000000000..e4b0c2fa0
--- /dev/null
+++ b/.changeset/fifty-jars-sing.md
@@ -0,0 +1,5 @@
+---
+'@lion/helpers': patch
+---
+
+Fix types for helpers
diff --git a/packages/helpers/renderLitAsNode/src/renderLitAsNode.js b/packages/helpers/renderLitAsNode/src/renderLitAsNode.js
index da60eaff3..955a0cba0 100644
--- a/packages/helpers/renderLitAsNode/src/renderLitAsNode.js
+++ b/packages/helpers/renderLitAsNode/src/renderLitAsNode.js
@@ -1,5 +1,11 @@
 import { render } from '@lion/core';
 
+/**
+ * Helper to render a lit TemplateResult as an offline-created DOM node
+ * Make sure that the top-most element in the template has no siblings,
+ * as they won't be taken into account. We only return firstElementChild.
+ * @param {import('lit-html').TemplateResult} litHtmlTemplate
+ */
 export const renderLitAsNode = litHtmlTemplate => {
   const offlineRenderContainer = document.createElement('div');
   render(litHtmlTemplate, offlineRenderContainer);
diff --git a/packages/helpers/sb-action-logger/src/SbActionLogger.js b/packages/helpers/sb-action-logger/src/SbActionLogger.js
index bdb5defed..bafd1ec99 100644
--- a/packages/helpers/sb-action-logger/src/SbActionLogger.js
+++ b/packages/helpers/sb-action-logger/src/SbActionLogger.js
@@ -122,11 +122,14 @@ export class SbActionLogger extends LitElement {
   constructor() {
     super();
     this.title = 'Action Logger';
+    this.simple = false;
     this.__logCounter = 0;
   }
 
   get loggerEl() {
-    return this.shadowRoot.querySelector('.logger');
+    return /** @type {HTMLElement} */ (
+      /** @type {ShadowRoot} */ (this.shadowRoot).querySelector('.logger')
+    );
   }
 
   /**
@@ -134,7 +137,7 @@ export class SbActionLogger extends LitElement {
    * Only supports simple values, will be interpreted to a String
    * E.g. an Object will become '[object Object]'
    *
-   * @param {} content Content to be logged to the action logger
+   * @param {string} content Content to be logged to the action logger
    */
   log(content) {
     this.__animateCue();
@@ -147,7 +150,10 @@ export class SbActionLogger extends LitElement {
       this.__handleConsecutiveDuplicateLog();
     } else {
       this.__appendLog(content);
-      this.loggerEl.scrollTo({ top: this.loggerEl.scrollHeight, behavior: 'smooth' });
+      this.loggerEl.scrollTo({
+        top: this.loggerEl.scrollHeight,
+        behavior: 'smooth',
+      });
     }
 
     this.__logCounter += 1; // increment total log counter
@@ -156,6 +162,7 @@ export class SbActionLogger extends LitElement {
   /**
    * Protected getter that returns the template of a single log
    *
+   * @param {string} content
    * @return {TemplateResult} TemplateResult that uses the content passed to create a log
    */
   // eslint-disable-next-line class-methods-use-this
@@ -183,16 +190,24 @@ export class SbActionLogger extends LitElement {
     `;
   }
 
+  /**
+   * @param {string} content
+   */
   __appendLog(content) {
     const offlineRenderContainer = document.createElement('div');
     render(this._logTemplate(content), offlineRenderContainer);
-    this.loggerEl.appendChild(offlineRenderContainer.firstElementChild);
+    if (offlineRenderContainer.firstElementChild) {
+      this.loggerEl.appendChild(offlineRenderContainer.firstElementChild);
+    }
   }
 
+  /**
+   * @param {string} content
+   */
   __isConsecutiveDuplicateLog(content) {
     if (
       this.loggerEl.lastElementChild &&
-      this.loggerEl.lastElementChild.querySelector('code').textContent.trim() === content
+      this.loggerEl.lastElementChild.querySelector('code')?.textContent?.trim() === content
     ) {
       return true;
     }
@@ -200,41 +215,51 @@ export class SbActionLogger extends LitElement {
   }
 
   __handleConsecutiveDuplicateLog() {
-    if (!this.loggerEl.lastElementChild.querySelector('.logger__log-count')) {
+    if (!this.loggerEl.lastElementChild?.querySelector('.logger__log-count')) {
       this.__prependLogCounterElement();
     }
 
     // Increment log counter for these duplicate logs
-    const logCounter = this.loggerEl.lastElementChild.querySelector('.logger__log-count');
-    let incrementedLogCount = logCounter.textContent;
-    incrementedLogCount = parseInt(incrementedLogCount, 10) + 1;
-    logCounter.innerText = incrementedLogCount;
+
+    const logCounter = this.loggerEl.lastElementChild?.querySelector('.logger__log-count');
+    if (logCounter instanceof HTMLElement) {
+      const logCount = logCounter.textContent;
+      if (logCount != null) {
+        const incrementedLogCount = parseInt(logCount, 10) + 1;
+        logCounter.innerText = incrementedLogCount.toString();
+      }
+    }
   }
 
   __prependLogCounterElement() {
     const countEl = document.createElement('div');
     countEl.classList.add('logger__log-count');
-    countEl.innerText = 1;
-    this.loggerEl.lastElementChild.insertBefore(
-      countEl,
-      this.loggerEl.lastElementChild.firstElementChild,
-    );
+    countEl.innerText = (1).toString();
+
+    const loggerLastElementChild = this.loggerEl.lastElementChild;
+    if (loggerLastElementChild) {
+      loggerLastElementChild.insertBefore(countEl, loggerLastElementChild.firstElementChild);
+    }
   }
 
   __animateCue() {
-    const cueEl = this.shadowRoot.querySelector('.header__log-cue-overlay');
-    cueEl.classList.remove('header__log-cue-overlay--slide');
-    // This triggers browser to stop batching changes because it has to evaluate something.
-    // eslint-disable-next-line no-void
-    void this.offsetWidth;
-    // So that when we arrive here, the browser sees this adding as an actual 'change'
-    // and this means the animation gets refired.
-    cueEl.classList.add('header__log-cue-overlay--slide');
+    const cueEl = this.shadowRoot?.querySelector('.header__log-cue-overlay');
+    if (cueEl) {
+      cueEl.classList.remove('header__log-cue-overlay--slide');
+      // This triggers browser to stop batching changes because it has to evaluate something.
+      // eslint-disable-next-line no-void
+      void this.offsetWidth;
+      // So that when we arrive here, the browser sees this adding as an actual 'change'
+      // and this means the animation gets refired.
+      cueEl.classList.add('header__log-cue-overlay--slide');
+    }
   }
 
   __clearLogs() {
-    const loggerEl = this.shadowRoot.querySelector('.logger');
-    loggerEl.innerHTML = '';
-    this.__logCounter = 0;
+    const loggerEl = this.shadowRoot?.querySelector('.logger');
+    if (loggerEl) {
+      loggerEl.innerHTML = '';
+      this.__logCounter = 0;
+    }
   }
 }
diff --git a/packages/helpers/sb-action-logger/test/sb-action-logger.test.js b/packages/helpers/sb-action-logger/test/sb-action-logger.test.js
index 754173145..2ccbdf9b3 100644
--- a/packages/helpers/sb-action-logger/test/sb-action-logger.test.js
+++ b/packages/helpers/sb-action-logger/test/sb-action-logger.test.js
@@ -1,21 +1,25 @@
-import { expect, fixture, html } from '@open-wc/testing';
+import { expect, fixture as _fixture, html } from '@open-wc/testing';
 import '../../sb-action-logger.js';
 
-// Note: skips are left out of first iteration
+/**
+ * @typedef {import('../src/SbActionLogger').SbActionLogger} SbActionLogger
+ * @typedef {import('lit-html').TemplateResult} TemplateResult
+ */
+const fixture = /** @type {(arg: TemplateResult|string) => Promise<SbActionLogger>} */ (_fixture);
 
 describe('sb-action-logger', () => {
   it('has a default title "Action Logger"', async () => {
     const el = await fixture(html`<sb-action-logger></sb-action-logger>`);
+    const titleEl = /** @type {HTMLElement} */ (el.shadowRoot?.querySelector('.header__title'));
 
-    expect(el.shadowRoot.querySelector('.header__title').innerText).to.equal('Action Logger');
+    expect(titleEl.innerText).to.equal('Action Logger');
   });
 
   it('has a title property / attribute that can be overridden', async () => {
     const el = await fixture(html`
       <sb-action-logger title="Logging your favorite fruit"></sb-action-logger>
     `);
-
-    const titleEl = el.shadowRoot.querySelector('.header__title');
+    const titleEl = /** @type {HTMLElement} */ (el.shadowRoot?.querySelector('.header__title'));
 
     expect(titleEl.innerText).to.equal('Logging your favorite fruit');
   });
@@ -26,10 +30,10 @@ describe('sb-action-logger', () => {
 
       el.log('Hello, World!');
 
-      const loggerEl = el.shadowRoot.querySelector('.logger');
-
+      const loggerEl = /** @type {HTMLElement} */ (el.shadowRoot?.querySelector('.logger'));
+      const loggerFirstEntryEl = /** @type {HTMLElement} */ (loggerEl.firstElementChild);
       expect(loggerEl.children.length).to.equal(1);
-      expect(loggerEl.firstElementChild.innerText).to.equal('Hello, World!');
+      expect(loggerFirstEntryEl.innerText).to.equal('Hello, World!');
     });
 
     it('appends new logs to the logger', async () => {
@@ -41,7 +45,7 @@ describe('sb-action-logger', () => {
       el.log('Hello, World!');
       el.log('Hello, Planet!');
 
-      const loggerEl = el.shadowRoot.querySelector('.logger');
+      const loggerEl = /** @type {HTMLElement} */ (el.shadowRoot?.querySelector('.logger'));
 
       expect(loggerEl.children.length).to.equal(5);
     });
@@ -49,7 +53,9 @@ describe('sb-action-logger', () => {
     it('shows a visual cue whenever something is logged to the logger', async () => {
       const el = await fixture(html`<sb-action-logger></sb-action-logger>`);
 
-      const cueEl = el.shadowRoot.querySelector('.header__log-cue-overlay');
+      const cueEl = /** @type {HTMLElement} */ (el.shadowRoot?.querySelector(
+        '.header__log-cue-overlay',
+      ));
       expect(cueEl.classList.contains('header__log-cue-overlay--slide')).to.be.false;
 
       el.log('Hello, World!');
@@ -59,7 +65,9 @@ describe('sb-action-logger', () => {
     it('has a visual counter that counts the amount of total logs', async () => {
       const el = await fixture(html`<sb-action-logger></sb-action-logger>`);
 
-      const cueEl = el.shadowRoot.querySelector('.header__log-cue-overlay');
+      const cueEl = /** @type {HTMLElement} */ (el.shadowRoot?.querySelector(
+        '.header__log-cue-overlay',
+      ));
 
       expect(cueEl.classList.contains('.header__log-cue-overlay--slide')).to.be.false;
 
@@ -73,10 +81,10 @@ describe('sb-action-logger', () => {
       el.log('Hello, World!');
       el.log('Hello, Planet!');
 
-      const clearBtn = el.shadowRoot.querySelector('.header__clear');
+      const clearBtn = /** @type {HTMLElement} */ (el.shadowRoot?.querySelector('.header__clear'));
       clearBtn.click();
 
-      expect(el.shadowRoot.querySelector('.logger').children.length).to.equal(0);
+      expect(el.shadowRoot?.querySelector('.logger')?.children.length).to.equal(0);
     });
 
     it('duplicate consecutive logs are kept as one, adds a visual counter', async () => {
@@ -90,33 +98,39 @@ describe('sb-action-logger', () => {
       el.log('Hello, Planet!');
       el.log('Hello, Planet!'); // 2 consecutive dupes
 
-      const loggerEl = el.shadowRoot.querySelector('.logger');
+      const loggerEl = /** @type {HTMLElement} */ (el.shadowRoot?.querySelector('.logger'));
 
-      const firstLog = loggerEl.firstElementChild;
-      const lastLog = loggerEl.lastElementChild;
+      const firstLogCount = /** @type {HTMLElement} */ (loggerEl.firstElementChild?.querySelector(
+        '.logger__log-count',
+      ));
+      const lastLogCount = /** @type {HTMLElement} */ (loggerEl.lastElementChild?.querySelector(
+        '.logger__log-count',
+      ));
 
       expect(loggerEl.children.length).to.equal(4);
-      expect(firstLog.querySelector('.logger__log-count').innerText).to.equal('3');
-      expect(lastLog.querySelector('.logger__log-count').innerText).to.equal('2');
+      expect(firstLogCount.innerText).to.equal('3');
+      expect(lastLogCount.innerText).to.equal('2');
     });
 
     it('can be set to simple mode for only showing a single log statement', async () => {
       const el = await fixture(html`<sb-action-logger simple></sb-action-logger>`);
       el.log('Hello, World!');
-      const loggerEl = el.shadowRoot.querySelector('.logger');
+      const loggerEl = /** @type {HTMLElement} */ (el.shadowRoot?.querySelector('.logger'));
+      const loggerCountEl = loggerEl.firstElementChild?.querySelector('.logger__log-count');
+      const codeEl = /** @type {HTMLElement} */ (loggerEl.firstElementChild?.querySelector('code'));
 
       expect(loggerEl.children.length).to.equal(1);
-      expect(loggerEl.firstElementChild.querySelector('code').innerText).to.equal('Hello, World!');
+      expect(codeEl.innerText).to.equal('Hello, World!');
 
       el.log('Hello, Earth!');
       expect(loggerEl.children.length).to.equal(1);
-      expect(loggerEl.firstElementChild.querySelector('code').innerText).to.equal('Hello, Earth!');
+      expect(codeEl.innerText).to.equal('Hello, Earth!');
 
       el.log('Hello, Planet!');
       el.log('Hello, Planet!');
       expect(loggerEl.children.length).to.equal(1);
-      expect(loggerEl.firstElementChild.querySelector('code').innerText).to.equal('Hello, Planet!');
-      expect(loggerEl.firstElementChild.querySelector('.logger__log-count')).to.be.null;
+      expect(codeEl.innerText).to.equal('Hello, Planet!');
+      expect(loggerCountEl).to.be.null;
     });
   });
 
diff --git a/packages/helpers/sb-locale-switcher/src/SbLocaleSwitcher.js b/packages/helpers/sb-locale-switcher/src/SbLocaleSwitcher.js
index 0df4f4781..8c30fe195 100644
--- a/packages/helpers/sb-locale-switcher/src/SbLocaleSwitcher.js
+++ b/packages/helpers/sb-locale-switcher/src/SbLocaleSwitcher.js
@@ -12,6 +12,9 @@ export class SbLocaleSwitcher extends LitElement {
     this.showLocales = ['en-GB', 'en-US', 'en-AU', 'nl-NL', 'nl-BE'];
   }
 
+  /**
+   * @param {string} locale
+   */
   // eslint-disable-next-line class-methods-use-this
   callback(locale) {
     document.documentElement.lang = locale;
diff --git a/packages/helpers/sortEachDepth/src/sortEachDepth.js b/packages/helpers/sortEachDepth/src/sortEachDepth.js
index d1c7d6e9b..45ee68750 100644
--- a/packages/helpers/sortEachDepth/src/sortEachDepth.js
+++ b/packages/helpers/sortEachDepth/src/sortEachDepth.js
@@ -12,10 +12,10 @@
  *     ]),
  * });
  *
- * @param {array} orderPerDepth array of arrays giving the order of each level
+ * @param {Array.<[]>} orderPerDepth array of arrays giving the order of each level
  */
 export function sortEachDepth(orderPerDepth) {
-  return (a, b) => {
+  return (/** @type {Array.<?>} */ a, /** @type {Array.<?>} */ b) => {
     // If the two stories have the same story kind, then use the default
     // ordering, which is the order they are defined in the story file.
     if (a[1].kind === b[1].kind) {
@@ -28,6 +28,7 @@ export function sortEachDepth(orderPerDepth) {
     let nameB;
     let indexA;
     let indexB;
+    /** @type {Array.<?>} */
     let ordering = orderPerDepth[0] || [];
     if (ordering.indexOf('...') !== -1 && ordering.indexOf('...abc') !== -1) {
       throw new Error(
diff --git a/tsconfig.json b/tsconfig.json
index e186db970..5d9493e95 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -27,10 +27,9 @@
     "packages/remark-extend/**/*.js",
     "packages/select-rich/test/**/*.js", // TODO: Needs to get typed!
     "packages/overlays/test/utils-tests/**/*.js", // TODO: Needs to get typed!
-    "packages/helpers/**/*.js", // FIXME: Needs to get typed!
     "packages/form-integrations/test/**/*.js", // TODO: Needs to get typed!
     "packages/combobox/test/**/*.js", // TODO: Needs to get typed!
-    "packages/ajax/**/*.js", // FIXME: Needs to get typed!
+    "packages/ajax/**/*.js", // Deprecated because we will move to redaxios soon.
     // ignore test/demos for singleton manager until overlays are typed as it's used in there
     "packages/singleton-manager/demo/",
     "packages/singleton-manager/test/"