Enable strict TypeScript in the Bootstrap port and add the bootstrap-component skill (#3044)

.agents/rules/main.mdc

@@ -30,6 +30,7 @@ Task-specific instructions live in `.agents/skills/<name>/SKILL.md` — read the
 | `shared-lib` | moving logic into `shared/lib/` and testing it |
 | `core-scss` | writing or changing styles in `core/scss/` |
 | `core-js` | working on the framework JavaScript in `core/js/` |
+| `bootstrap-component` | writing a new component class in `core/js/src/bootstrap/` (typed config, events, Data API) |
 | `demo-pages` | adding or updating a page in `preview/pages/` |
 | `write-docs` | writing or updating a page in `docs/content/` |
 | `class-reference` | a docs page needs its `classnames` table added or refreshed |

.agents/skills/bootstrap-component/SKILL.md

@@ -0,0 +1,224 @@
+---
+name: bootstrap-component
+description: >-
+  Write a new Bootstrap-style JavaScript component class in `core/js/src/bootstrap/` — a `BaseComponent` subclass with typed config, `EVENT_*`/`CLASS_NAME_*` constants and a `data-bs-toggle` Data API. Use whenever the user asks for a new component in the Bootstrap port (a toggler, a dialog, a chip input, a stepper) or
+  wants an existing one brought up to this baseline. Covers file structure, TypeScript typing of `Default` and `DefaultType`, constructor and config merging, events, the Data API handler and the minimal public API. Not for the build, the tests or the size budget — that is the `core-js` skill.
+---
+
+# Rules for writing new components
+
+You are a master of JavaScript and TypeScript.
+
+The points below are the baseline for every new component class in `core/js/src/bootstrap/`. Read the `core-js` skill first for what that directory is (a vendored port of Bootstrap's JavaScript), how it is built, tested and size-budgeted.
+
+## 1. File structure
+
+In this order:
+
+1. Header with the MIT license comment and the file name (`Bootstrap toggler.ts`).
+2. Imports: `BaseComponent`, `EventHandler`, optionally `Manipulator`, `SelectorEngine`, helpers from `./util/*`.
+3. Types and interfaces at the top (`ComponentConfig`, `ComponentConfigInput`).
+4. Constants: `NAME`, `DATA_KEY`, `EVENT_KEY`, selectors, classes, event names.
+5. `Default` and `DefaultType` with TS types.
+6. The component class.
+7. "Data API implementation" section (when applicable).
+8. Default export of the class.
+
+## 2. Typing
+
+- Define `type ComponentConfig` and `type ComponentConfigInput`:
+
+  ```ts
+  type ComponentConfig = {
+    attribute: string
+    value: string | number | boolean | null
+  }
+
+  type ComponentConfigInput = Partial<ComponentConfig> & Record<string, unknown>
+  ```
+
+- Type `Default` as `ComponentConfig`.
+- Type `DefaultType` as `Record<keyof ComponentConfig, string>`.
+- In the class, declare:
+  - `declare _element: HTMLElement` (or a more specific element type).
+  - `declare _config: ComponentConfig`.
+  - `declare _isTransitioning: boolean` (when needed).
+- Type method signatures explicitly (`show(): void`, `hide(): void`).
+- `EventHandler.trigger(...)` can return `null` — use `?.defaultPrevented`.
+- Use `Event` for handlers, and cast when you need specifics (`const keyboardEvent = event as KeyboardEvent`). `EventHandler.on` is generic, so `(event: KeyboardEvent) => …` type-checks without a cast; for `event.delegateTarget` cast to `DelegatedEvent` from `./dom/event-handler`.
+- `core/tsconfig.json` is `strict` and `core/js/src` has no `any` at all, so a missing null check or an implicit `any` fails `pnpm run type-check`. Reach for `unknown` plus a type guard, or a small named type, instead of `any`, `[key: string]: any` or `as any`.
+- Prefer modern syntax like `#private` class fields over the `private` keyword.
+
+## 3. Constructor and config
+
+- Call `super(element, config as Record<string, unknown>)`.
+- Read config from `Manipulator.getDataAttributes(...)` and merge with `Default`. `BaseComponent._getConfig` already does this through `_mergeConfigObj` → `_configAfterMerge` → `_typeCheckConfig`.
+- If you need custom config processing, override `_getConfig` (or `_configAfterMerge`).
+- After constructing, only set required fields and attach listeners.
+
+## 4. Events and CSS classes
+
+- Use constants in the format `EVENT_${NAME}` and `CLASS_NAME_*`.
+- Build events with `EVENT_KEY` and `DATA_KEY` (as in `alert.ts`):
+
+  ```ts
+  const NAME = 'toggler'
+  const DATA_KEY = 'bs.toggler'
+  const EVENT_KEY = `.${DATA_KEY}`
+
+  const EVENT_TOGGLE = `toggle${EVENT_KEY}`
+  const EVENT_TOGGLED = `toggled${EVENT_KEY}`
+  const CLASS_NAME_SHOW = 'show'
+  ```
+
+- Fire a cancellable `before` event, do the work, then fire the `after` event.
+- Use only `EventHandler.on/off/one/trigger`.
+
+## 5. Data API
+
+- Selector in the form `[data-bs-toggle="name"]`. The attribute API stays `data-bs-*`; `data-tblr-*` is a 2.0 change (see `core-js`).
+- Data API handler:
+  - check `A/AREA` and `event.preventDefault()`.
+  - use `SelectorEngine.getElementFromSelector`.
+  - `Name.getOrCreateInstance(target, config)` for data attributes.
+- Use the helpers from `./util/component-functions` instead of writing the handler by hand:
+  - `eventActionOnPlugin(Component, 'click', SELECTOR_DATA_TOGGLE, 'toggle')` for a `data-bs-toggle` — resolves the targets (`data-bs-target` / `href`, or the trigger itself), skips `.disabled` / `:disabled`, prevents the default on `A/AREA`, and calls the method on `getOrCreateInstance` of every target. An optional
+    fifth argument receives `{ targets, event, instances }`.
+  - `enableDismissTrigger(Component, 'close')` for a `data-bs-dismiss`.
+  - Write the `EventHandler.on(document, ...)` handler yourself only when the trigger needs config from data attributes or other custom logic.
+
+## 6. Initialization and public API
+
+- Minimal public API: `show`, `hide`, `toggle`, `dispose`.
+- If the component has animation state, use `_queueCallback` and `_isAnimated`.
+- Expose `static get NAME`, `static get Default`, `static get DefaultType`.
+- Export the class from `core/js/src/bootstrap.ts` (named export and the `bootstrap` namespace object), otherwise it never ships.
+
+## 7. Style and consistency
+
+- Keep style consistent with existing components (indentation, naming, comments, the `// Getters` / `// Public` / `// Private` section comments).
+- Avoid direct DOM operations outside `EventHandler` and `SelectorEngine`, unless the component requires otherwise.
+
+## 8. Template
+
+```ts
+/**
+ * --------------------------------------------------------------------------
+ * Bootstrap toggler.ts
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
+ * --------------------------------------------------------------------------
+ */
+
+import BaseComponent from './base-component'
+import EventHandler from './dom/event-handler'
+import { eventActionOnPlugin } from './util/component-functions'
+
+type ComponentConfig = {
+  attribute: string
+  value: string | number | boolean | null
+}
+
+type ComponentConfigInput = Partial<ComponentConfig> & Record<string, unknown>
+
+/**
+ * Constants
+ */
+
+const NAME = 'toggler'
+const DATA_KEY = 'bs.toggler'
+const EVENT_KEY = `.${DATA_KEY}`
+
+const EVENT_TOGGLE = `toggle${EVENT_KEY}`
+const EVENT_TOGGLED = `toggled${EVENT_KEY}`
+const EVENT_CLICK = 'click'
+
+const SELECTOR_DATA_TOGGLE = '[data-bs-toggle="toggler"]'
+
+const DefaultType: Record<keyof ComponentConfig, string> = {
+  attribute: 'string',
+  value: '(string|number|boolean)',
+}
+
+const Default: ComponentConfig = {
+  attribute: 'class',
+  value: null,
+}
+
+/**
+ * Class definition
+ */
+
+class Toggler extends BaseComponent {
+  declare _element: HTMLElement
+  declare _config: ComponentConfig
+
+  constructor(element?: Element | string | null, config?: ComponentConfigInput | null) {
+    super(element as string | HTMLElement, (config ?? undefined) as Record<string, unknown>)
+  }
+
+  // Getters
+  static get Default(): ComponentConfig {
+    return Default
+  }
+
+  static get DefaultType(): Record<keyof ComponentConfig, string> {
+    return DefaultType
+  }
+
+  static get NAME(): string {
+    return NAME
+  }
+
+  // Public
+  toggle(): void {
+    const toggleEvent = EventHandler.trigger(this._element, EVENT_TOGGLE)
+
+    if (toggleEvent?.defaultPrevented) {
+      return
+    }
+
+    this._execute()
+
+    EventHandler.trigger(this._element, EVENT_TOGGLED)
+  }
+
+  // Private
+  _execute(): void {
+    const { attribute, value } = this._config
+
+    if (attribute === 'class') {
+      if (value) {
+        this._element.classList.toggle(String(value))
+      }
+      return
+    }
+
+    // Compare as strings since getAttribute() always returns a string
+    if (this._element.getAttribute(attribute) === String(value)) {
+      this._element.removeAttribute(attribute)
+      return
+    }
+
+    this._element.setAttribute(attribute, String(value))
+  }
+}
+
+/**
+ * Data API implementation
+ */
+
+eventActionOnPlugin(Toggler, EVENT_CLICK, SELECTOR_DATA_TOGGLE, 'toggle')
+
+export default Toggler
+```
+
+## 9. Checklist
+
+- [ ] File order as in §1, MIT header with the file name
+- [ ] `ComponentConfig` / `ComponentConfigInput` defined; `Default` and `DefaultType` typed
+- [ ] `declare _element` / `declare _config` in the class, explicit return types
+- [ ] `EVENT_*` and `CLASS_NAME_*` constants, `?.defaultPrevented` on cancellable events
+- [ ] Data API on `[data-bs-toggle="name"]` through `eventActionOnPlugin` (or a hand-written handler with the `A/AREA` guard and `getOrCreateInstance`)
+- [ ] Public API limited to `show` / `hide` / `toggle` / `dispose`
+- [ ] Exported from `core/js/src/bootstrap.ts`
+- [ ] Spec in `js/tests/unit/`, and the `core-js` checklist (type-check, prettier, bundlewatch)

.agents/skills/core-js/SKILL.md

@@ -1,13 +1,8 @@
 ---
 name: core-js
 description: >-
-  Work on the framework's own JavaScript in `core/js/` — the `tabler.js` and
-  `tabler-theme.js` bundles, the vendored Bootstrap component port, and their
-  browser tests. Use when a Tabler behaviour needs adding or fixing (a
-  `data-bs-toggle` handler, the theme switcher, a plugin initialiser), when a
-  Bootstrap component's JS misbehaves, and before changing anything under
-  `core/js/src/`. Not for demo-page scripts — that is the `astro-scripts`
-  skill.
+  Work on the framework's own JavaScript in `core/js/` — the `tabler.js` and `tabler-theme.js` bundles, the vendored Bootstrap component port, and their browser tests. Use when a Tabler behaviour needs adding or fixing (a `data-bs-toggle` handler, the theme switcher, a plugin initialiser), when a Bootstrap component's
+  JS misbehaves, and before changing anything under `core/js/src/`. Not for demo-page scripts — that is the `astro-scripts` skill.
 ---
 
 # The framework JavaScript
@@ -16,10 +11,10 @@ description: >-
 
 ## 1. Two entry points
 
-| Entry | Ships as | Holds |
-| --- | --- | --- |
-| `js/tabler.ts` | `tabler.js` / `.esm.js` (+ `.min`) | plugin initialisers, the Bootstrap components, the `tabler` helper namespace |
-| `js/tabler-theme.ts` | `tabler-theme.js` (+ variants) | the colour-mode/theme switcher only |
+| Entry                | Ships as                           | Holds                                                                        |
+| -------------------- | ---------------------------------- | ---------------------------------------------------------------------------- |
+| `js/tabler.ts`       | `tabler.js` / `.esm.js` (+ `.min`) | plugin initialisers, the Bootstrap components, the `tabler` helper namespace |
+| `js/tabler-theme.ts` | `tabler-theme.js` (+ variants)     | the colour-mode/theme switcher only                                          |
 
 `tabler-theme.js` is loaded right after `<body>` and **not deferred**, so the chosen theme applies before the first paint. It stays tiny on purpose (bundlewatch: 1 kB raw, 800 B minified) — do not add anything to it that is not needed before paint.
 
@@ -29,6 +24,7 @@ That directory is Bootstrap's JavaScript rewritten in TypeScript, MIT headers ke
 
 - Fix bugs the way upstream did, and keep the file's structure recognisable against `twbs/bootstrap`. Gratuitous restructuring makes the next upstream sync expensive.
 - `js/src/bootstrap.ts` is the single source of truth for what is exported and for the `bootstrap` namespace object.
+- A new or reworked component class follows the `bootstrap-component` skill (file order, typed config, Data API).
 - Coverage is configured to measure exactly this directory (`js/src/bootstrap/**`), and `js/tests/unit/*.spec.ts` mirrors upstream's suite — a change here is expected to come with its test.
 
 ## 3. Tabler's own modules
@@ -74,11 +70,11 @@ pnpm --filter @tabler/core test:js:coverage
 
 `vite` builds each entry as a library in `es` + `umd` (`BASE_NAME` selects the entry), then terser produces the `.min` variants with source maps. Sizes are enforced:
 
-| File | Limit |
-| --- | --- |
-| `dist/js/tabler.js` | 64 kB |
-| `dist/js/tabler.min.js` | 48 kB |
-| `dist/js/tabler-theme.js` | 1 kB |
+| File                      | Limit |
+| ------------------------- | ----- |
+| `dist/js/tabler.js`       | 64 kB |
+| `dist/js/tabler.min.js`   | 48 kB |
+| `dist/js/tabler-theme.js` | 1 kB  |
 
 ```bash
 pnpm --filter @tabler/core build

.changeset/strict-typescript-bootstrap-port.md

@@ -0,0 +1,5 @@
+---
+"@tabler/core": patch
+---
+
+Updated the Bootstrap component port to strict TypeScript with typed `ComponentConfig` types and added `eventActionOnPlugin`.

.gitignore

@@ -49,6 +49,7 @@ sri.json
 # Test coverage
 coverage/
 __screenshots__/
+.vitest-attachments/
 __pycache__/
 .claude/launch.json
 .claude/settings.local.json

core/js/src/bootstrap/base-component.ts

@@ -58,7 +58,7 @@ class BaseComponent extends Config {
   }
 
   static getOrCreateInstance(element: ElementSelector, config: ComponentConfig = {}): BaseComponent {
-    return this.getInstance(element) || new this(element, typeof config === 'object' ? config : null)
+    return this.getInstance(element) || new this(element, typeof config === 'object' ? config : undefined)
   }
 
   static get VERSION(): string {

core/js/src/bootstrap/button.ts

@@ -18,6 +18,8 @@ const SELECTOR_DATA_TOGGLE = '[data-bs-toggle="button"], [data-tblr-toggle="butt
 const EVENT_CLICK_DATA_API = `click${EVENT_KEY}${DATA_API_KEY}`
 
 class Button extends BaseComponent {
+  declare _element: HTMLElement
+
   static get NAME(): string {
     return NAME
   }

core/js/src/bootstrap/carousel.ts

@@ -11,7 +11,18 @@ import Manipulator from './dom/manipulator'
 import SelectorEngine from './dom/selector-engine'
 import { getNextActiveElement, isRTL, isVisible, reflow, triggerTransitionEnd } from './util/index'
 import Swipe from './util/swipe'
-import type { ComponentConfig, ComponentConfigType } from './types'
+
+type ComponentConfig = {
+  interval: number | boolean
+  keyboard: boolean
+  pause: 'hover' | boolean
+  ride: boolean | 'carousel'
+  touch: boolean
+  wrap: boolean
+  defaultInterval?: number | boolean
+}
+
+type ComponentConfigInput = Partial<Omit<ComponentConfig, 'defaultInterval'>> & Record<string, unknown>
 
 const NAME = 'carousel'
 const DATA_KEY = 'bs.carousel'
@@ -66,7 +77,7 @@ const Default: ComponentConfig = {
   wrap: true,
 }
 
-const DefaultType: ComponentConfigType = {
+const DefaultType: Record<Exclude<keyof ComponentConfig, 'defaultInterval'>, string> = {
   interval: '(number|boolean)',
   keyboard: 'boolean',
   pause: '(string|boolean)',
@@ -76,6 +87,8 @@ const DefaultType: ComponentConfigType = {
 }
 
 class Carousel extends BaseComponent {
+  declare _element: HTMLElement
+  declare _config: ComponentConfig
   _interval: ReturnType<typeof setInterval> | null
   _activeElement: HTMLElement | null
   _isSliding: boolean
@@ -83,7 +96,7 @@ class Carousel extends BaseComponent {
   _swipeHelper: Swipe | null
   _indicatorsElement: HTMLElement | null
 
-  constructor(element: HTMLElement | string, config?: Partial<ComponentConfig>) {
+  constructor(element: HTMLElement | string, config?: ComponentConfigInput) {
     super(element, config)
 
     this._interval = null
@@ -104,7 +117,7 @@ class Carousel extends BaseComponent {
     return Default
   }
 
-  static get DefaultType(): ComponentConfigType {
+  static get DefaultType(): Record<Exclude<keyof ComponentConfig, 'defaultInterval'>, string> {
     return DefaultType
   }
 
@@ -273,7 +286,7 @@ class Carousel extends BaseComponent {
 
     const elementInterval = Number.parseInt(element.getAttribute('data-bs-interval') || element.getAttribute('data-tblr-interval') || '', 10)
 
-    this._config.interval = elementInterval || this._config.defaultInterval
+    this._config.interval = elementInterval || (this._config.defaultInterval ?? this._config.interval)
   }
 
   _slide(order: string, element: HTMLElement | null = null): void {
@@ -302,7 +315,7 @@ class Carousel extends BaseComponent {
 
     const slideEvent = triggerEvent(EVENT_SLIDE)
 
-    if (slideEvent.defaultPrevented) {
+    if (slideEvent?.defaultPrevented) {
       return
     }
 

core/js/src/bootstrap/collapse.ts

@@ -9,7 +9,15 @@ import BaseComponent from './base-component'
 import EventHandler from './dom/event-handler'
 import SelectorEngine from './dom/selector-engine'
 import { getElement, reflow } from './util/index'
-import type { ComponentConfig, ComponentConfigType, ElementSelector } from './types'
+import type { DelegatedEvent } from './dom/event-handler'
+import type { ElementSelector } from './types'
+
+type ComponentConfig = {
+  parent: HTMLElement | null
+  toggle: boolean
+}
+
+type ComponentConfigInput = Partial<Omit<ComponentConfig, 'parent'>> & { parent?: HTMLElement | string | null } & Record<string, unknown>
 
 const NAME = 'collapse'
 const DATA_KEY = 'bs.collapse'
@@ -40,16 +48,18 @@ const Default: ComponentConfig = {
   toggle: true,
 }
 
-const DefaultType: ComponentConfigType = {
+const DefaultType: Record<keyof ComponentConfig, string> = {
   parent: '(null|element)',
   toggle: 'boolean',
 }
 
 class Collapse extends BaseComponent {
+  declare _element: HTMLElement
+  declare _config: ComponentConfig
   _isTransitioning: boolean
   _triggerArray: HTMLElement[]
 
-  constructor(element: ElementSelector, config?: ComponentConfig) {
+  constructor(element: ElementSelector, config?: ComponentConfigInput) {
     super(element, config)
 
     this._isTransitioning = false
@@ -81,7 +91,7 @@ class Collapse extends BaseComponent {
     return Default
   }
 
-  static get DefaultType(): ComponentConfigType {
+  static get DefaultType(): Record<keyof ComponentConfig, string> {
     return DefaultType
   }
 
@@ -240,7 +250,8 @@ class Collapse extends BaseComponent {
 }
 
 EventHandler.on(document, EVENT_CLICK_DATA_API, SELECTOR_DATA_TOGGLE, function (this: HTMLElement, event: Event) {
-  if ((event.target as HTMLElement).tagName === 'A' || ((event as any).delegateTarget && (event as any).delegateTarget.tagName === 'A')) {
+  const { delegateTarget } = event as DelegatedEvent
+  if ((event.target as HTMLElement).tagName === 'A' || (delegateTarget && delegateTarget.tagName === 'A')) {
     event.preventDefault()
   }
 

core/js/src/bootstrap/dom/event-handler.ts

@@ -5,7 +5,10 @@
  * --------------------------------------------------------------------------
  */
 
-type EventCallback = (this: EventTarget, ...args: unknown[]) => void
+// `this` is the element the handler was bound to, or the delegate target
+export type EventCallback<E extends Event = Event> = (this: HTMLElement, event: E) => void
+
+export type DelegatedEvent<E extends Event = Event> = E & { delegateTarget: HTMLElement }
 
 interface BootstrapHandler {
   (event: Event): void
@@ -99,7 +102,7 @@ function bootstrapHandler(element: EventTarget, fn: EventCallback): BootstrapHan
       EventHandler.off(element, event.type, fn)
     }
 
-    return fn.apply(element, [event])
+    return fn.apply(element as HTMLElement, [event])
   } as BootstrapHandler
 }
 
@@ -119,7 +122,7 @@ function bootstrapDelegationHandler(element: EventTarget, selector: string, fn:
           EventHandler.off(element, event.type, selector, fn)
         }
 
-        return fn.apply(target, [event])
+        return fn.apply(target as HTMLElement, [event])
       }
     }
   } as BootstrapHandler
@@ -129,7 +132,7 @@ function findHandler(events: Record<string | number, BootstrapHandler>, callable
   return Object.values(events).find((event) => event.callable === callable && event.delegationSelector === delegationSelector)
 }
 
-function normalizeParameters(originalTypeEvent: string, handler: string | EventCallback | undefined, delegationFunction: EventCallback | undefined): [boolean, EventCallback, string] {
+function normalizeParameters(originalTypeEvent: string, handler: string | false | EventCallback | undefined, delegationFunction: EventCallback | undefined): [boolean, EventCallback, string] {
   const isDelegated = typeof handler === 'string'
   const callable = isDelegated ? delegationFunction! : (handler || delegationFunction)!
   let typeEvent = getTypeEvent(originalTypeEvent)
@@ -141,7 +144,7 @@ function normalizeParameters(originalTypeEvent: string, handler: string | EventC
   return [isDelegated, callable, typeEvent]
 }
 
-function addHandler(element: EventTarget | null, originalTypeEvent: string, handler: string | EventCallback | undefined, delegationFunction: EventCallback | undefined, oneOff: boolean): void {
+function addHandler(element: EventTarget | null, originalTypeEvent: string, handler: string | false | EventCallback | undefined, delegationFunction: EventCallback | undefined, oneOff: boolean): void {
   if (typeof originalTypeEvent !== 'string' || !element) {
     return
   }
@@ -150,10 +153,10 @@ function addHandler(element: EventTarget | null, originalTypeEvent: string, hand
 
   if (originalTypeEvent in customEvents) {
     const wrapFunction = (fn: EventCallback): EventCallback => {
-      return function (this: EventTarget, event: unknown) {
-        const evt = event as MouseEvent & { delegateTarget: HTMLElement }
+      return function (this: EventTarget, event: Event) {
+        const evt = event as DelegatedEvent<MouseEvent>
         if (!evt.relatedTarget || (evt.relatedTarget !== evt.delegateTarget && !evt.delegateTarget.contains(evt.relatedTarget as Node))) {
-          return fn.call(this, event)
+          return fn.call(this as HTMLElement, event)
         }
       }
     }
@@ -210,20 +213,20 @@ function getTypeEvent(event: string): string {
 }
 
 const EventHandler = {
-  on(element: EventTarget | null, event: string, handler: string | EventCallback, delegationFunction?: EventCallback): void {
-    addHandler(element, event, handler, delegationFunction, false)
+  on<E extends Event = Event>(element: EventTarget | null, event: string, handler: string | false | EventCallback<E>, delegationFunction?: EventCallback<E>): void {
+    addHandler(element, event, handler as string | false | EventCallback, delegationFunction as EventCallback | undefined, false)
   },
 
-  one(element: EventTarget | null, event: string, handler: string | EventCallback, delegationFunction?: EventCallback): void {
-    addHandler(element, event, handler, delegationFunction, true)
+  one<E extends Event = Event>(element: EventTarget | null, event: string, handler: string | false | EventCallback<E>, delegationFunction?: EventCallback<E>): void {
+    addHandler(element, event, handler as string | false | EventCallback, delegationFunction as EventCallback | undefined, true)
   },
 
-  off(element: EventTarget | null, originalTypeEvent: string, handler?: string | EventCallback, delegationFunction?: EventCallback): void {
+  off<E extends Event = Event>(element: EventTarget | null, originalTypeEvent: string, handler?: string | false | EventCallback<E>, delegationFunction?: EventCallback<E>): void {
     if (typeof originalTypeEvent !== 'string' || !element) {
       return
     }
 
-    const [isDelegated, callable, typeEvent] = normalizeParameters(originalTypeEvent, handler, delegationFunction)
+    const [isDelegated, callable, typeEvent] = normalizeParameters(originalTypeEvent, handler as string | false | EventCallback | undefined, delegationFunction as EventCallback | undefined)
     const inNamespace = typeEvent !== originalTypeEvent
     const events = getElementEvents(element)
     const storeElementEvent = events[typeEvent] || {}

core/js/src/bootstrap/dropdown.ts

@@ -11,7 +11,24 @@ import EventHandler from './dom/event-handler'
 import Manipulator from './dom/manipulator'
 import SelectorEngine from './dom/selector-engine'
 import { execute, getElement, getNextActiveElement, isDisabled, isElement, isRTL, isVisible, noop } from './util/index'
-import type { ComponentConfig, ComponentConfigType } from './types'
+import type { DelegatedEvent } from './dom/event-handler'
+
+type PopperOffsetData = { placement: Popper.Placement; reference: Popper.Rect; popper: Popper.Rect }
+type PopperOffsetFunction = (popperData: PopperOffsetData) => number[]
+type PopperConfigFunction = (defaultConfig: Partial<Popper.Options>) => Partial<Popper.Options>
+
+type ComponentConfig = {
+  autoClose: boolean | 'inside' | 'outside'
+  boundary: Popper.Boundary
+  display: 'dynamic' | 'static'
+  offset: number[] | string | ((popperData: PopperOffsetData, element: HTMLElement) => number[])
+  popperConfig: Partial<Popper.Options> | PopperConfigFunction | null
+  reference: 'toggle' | 'parent' | HTMLElement | Popper.VirtualElement
+}
+
+type ComponentConfigInput = Partial<ComponentConfig> & Record<string, unknown>
+
+type RelatedTarget = { relatedTarget: HTMLElement; clickEvent?: Event }
 
 const NAME = 'dropdown'
 const DATA_KEY = 'bs.dropdown'
@@ -64,7 +81,7 @@ const Default: ComponentConfig = {
   reference: 'toggle',
 }
 
-const DefaultType: ComponentConfigType = {
+const DefaultType: Record<keyof ComponentConfig, string> = {
   autoClose: '(boolean|string)',
   boundary: '(string|element)',
   display: 'string',
@@ -74,12 +91,14 @@ const DefaultType: ComponentConfigType = {
 }
 
 class Dropdown extends BaseComponent {
+  declare _element: HTMLElement
+  declare _config: ComponentConfig
   _popper: Popper.Instance | null
   _parent: HTMLElement
   _menu: HTMLElement
   _inNavbar: boolean
 
-  constructor(element: HTMLElement | string, config?: Partial<ComponentConfig>) {
+  constructor(element: HTMLElement | string, config?: ComponentConfigInput) {
     super(element, config)
 
     this._popper = null
@@ -92,7 +111,7 @@ class Dropdown extends BaseComponent {
     return Default
   }
 
-  static get DefaultType(): ComponentConfigType {
+  static get DefaultType(): Record<keyof ComponentConfig, string> {
     return DefaultType
   }
 
@@ -115,14 +134,14 @@ class Dropdown extends BaseComponent {
 
     const showEvent = EventHandler.trigger(this._element, EVENT_SHOW, relatedTarget)
 
-    if (showEvent.defaultPrevented) {
+    if (showEvent?.defaultPrevented) {
       return
     }
 
     this._createPopper()
 
     if ('ontouchstart' in document.documentElement && !this._parent.closest(SELECTOR_NAVBAR_NAV)) {
-      for (const element of [].concat(...(document.body.children as any))) {
+      for (const element of Array.from(document.body.children)) {
         EventHandler.on(element, 'mouseover', noop)
       }
     }
@@ -162,14 +181,14 @@ class Dropdown extends BaseComponent {
     }
   }
 
-  _completeHide(relatedTarget: Record<string, any>): void {
+  _completeHide(relatedTarget: RelatedTarget): void {
     const hideEvent = EventHandler.trigger(this._element, EVENT_HIDE, relatedTarget)
-    if (hideEvent.defaultPrevented) {
+    if (hideEvent?.defaultPrevented) {
       return
     }
 
     if ('ontouchstart' in document.documentElement) {
-      for (const element of [].concat(...(document.body.children as any))) {
+      for (const element of Array.from(document.body.children)) {
         EventHandler.off(element, 'mouseover', noop)
       }
     }
@@ -185,14 +204,14 @@ class Dropdown extends BaseComponent {
     EventHandler.trigger(this._element, EVENT_HIDDEN, relatedTarget)
   }
 
-  _getConfig(config: Partial<ComponentConfig>): ComponentConfig {
-    config = super._getConfig(config)
+  _getConfig(config?: ComponentConfigInput): ComponentConfig {
+    const merged = super._getConfig(config) as ComponentConfig
 
-    if (typeof config.reference === 'object' && !isElement(config.reference) && typeof (config.reference as any).getBoundingClientRect !== 'function') {
+    if (typeof merged.reference === 'object' && !isElement(merged.reference) && typeof (merged.reference as Popper.VirtualElement).getBoundingClientRect !== 'function') {
       throw new TypeError(`${NAME.toUpperCase()}: Option "reference" provided type "object" without a required "getBoundingClientRect" method.`)
     }
 
-    return config
+    return merged
   }
 
   _createPopper(): void {
@@ -250,7 +269,7 @@ class Dropdown extends BaseComponent {
     return this._element.closest(SELECTOR_NAVBAR) !== null
   }
 
-  _getOffset(): number[] | ((popperData: any) => number[]) {
+  _getOffset(): number[] | PopperOffsetFunction {
     const { offset } = this._config
 
     if (typeof offset === 'string') {
@@ -258,10 +277,10 @@ class Dropdown extends BaseComponent {
     }
 
     if (typeof offset === 'function') {
-      return (popperData: any) => (offset as Function)(popperData, this._element)
+      return (popperData: PopperOffsetData) => offset(popperData, this._element)
     }
 
-    return offset as number[]
+    return offset
   }
 
   _getPopperConfig(): Partial<Popper.Options> {
@@ -300,14 +319,15 @@ class Dropdown extends BaseComponent {
     }
   }
 
-  _selectMenuItem({ key, target }: { key: string; target: HTMLElement }): void {
+  _selectMenuItem({ key, target }: { key: string; target: EventTarget | null }): void {
     const items = SelectorEngine.find(SELECTOR_VISIBLE_ITEMS, this._menu).filter((element) => isVisible(element))
 
     if (!items.length) {
       return
     }
 
-    getNextActiveElement(items, target, key === ARROW_DOWN_KEY, !items.includes(target)).focus()
+    const activeElement = target as HTMLElement
+    getNextActiveElement(items, activeElement, key === ARROW_DOWN_KEY, !items.includes(activeElement)).focus()
   }
 
   static clearMenus(event: Event & { button?: number; key?: string; composedPath?: () => EventTarget[] }): void {
@@ -333,7 +353,7 @@ class Dropdown extends BaseComponent {
         continue
       }
 
-      const relatedTarget: Record<string, any> = { relatedTarget: context._element }
+      const relatedTarget: RelatedTarget = { relatedTarget: context._element }
 
       if (event.type === 'click') {
         relatedTarget.clickEvent = event
@@ -358,14 +378,14 @@ class Dropdown extends BaseComponent {
 
     event.preventDefault()
 
-    const getToggleButton = this.matches(SELECTOR_DATA_TOGGLE) ? this : SelectorEngine.prev(this, SELECTOR_DATA_TOGGLE)[0] || SelectorEngine.next(this, SELECTOR_DATA_TOGGLE)[0] || SelectorEngine.findOne(SELECTOR_DATA_TOGGLE, (event as any).delegateTarget.parentNode)
+    const getToggleButton = this.matches(SELECTOR_DATA_TOGGLE) ? this : SelectorEngine.prev(this, SELECTOR_DATA_TOGGLE)[0] || SelectorEngine.next(this, SELECTOR_DATA_TOGGLE)[0] || SelectorEngine.findOne(SELECTOR_DATA_TOGGLE, (event as DelegatedEvent<KeyboardEvent>).delegateTarget.parentNode as Element)
 
     const instance = Dropdown.getOrCreateInstance(getToggleButton!) as Dropdown
 
     if (isUpOrDownEvent) {
       event.stopPropagation()
       instance.show()
-      instance._selectMenuItem(event as any)
+      instance._selectMenuItem(event)
       return
     }
 

core/js/src/bootstrap/modal.ts

@@ -45,13 +45,13 @@ const SELECTOR_DIALOG = '.modal-dialog'
 const SELECTOR_MODAL_BODY = '.modal-body'
 const SELECTOR_DATA_TOGGLE = '[data-bs-toggle="modal"], [data-tblr-toggle="modal"]'
 
-interface ComponentConfig {
-  [key: string]: any
+type ComponentConfig = {
+  backdrop: boolean | 'static'
+  focus: boolean
+  keyboard: boolean
 }
 
-interface ComponentConfigType {
-  [key: string]: string
-}
+type ComponentConfigInput = Partial<ComponentConfig> & Record<string, unknown>
 
 const Default: ComponentConfig = {
   backdrop: true,
@@ -59,7 +59,7 @@ const Default: ComponentConfig = {
   keyboard: true,
 }
 
-const DefaultType: ComponentConfigType = {
+const DefaultType: Record<keyof ComponentConfig, string> = {
   backdrop: '(boolean|string)',
   focus: 'boolean',
   keyboard: 'boolean',
@@ -70,6 +70,8 @@ const DefaultType: ComponentConfigType = {
  */
 
 class Modal extends BaseComponent {
+  declare _element: HTMLElement
+  declare _config: ComponentConfig
   _dialog: HTMLElement | null
   _backdrop: Backdrop
   _focustrap: FocusTrap
@@ -77,7 +79,7 @@ class Modal extends BaseComponent {
   _isTransitioning: boolean
   _scrollBar: ScrollBarHelper
 
-  constructor(element: HTMLElement | string, config?: Partial<ComponentConfig>) {
+  constructor(element: HTMLElement | string, config?: ComponentConfigInput) {
     super(element, config)
 
     this._dialog = SelectorEngine.findOne(SELECTOR_DIALOG, this._element)
@@ -94,7 +96,7 @@ class Modal extends BaseComponent {
     return Default
   }
 
-  static get DefaultType(): ComponentConfigType {
+  static get DefaultType(): Record<keyof ComponentConfig, string> {
     return DefaultType
   }
 
@@ -115,7 +117,7 @@ class Modal extends BaseComponent {
       relatedTarget,
     })
 
-    if (showEvent.defaultPrevented) {
+    if (showEvent?.defaultPrevented) {
       return
     }
 
@@ -138,7 +140,7 @@ class Modal extends BaseComponent {
 
     const hideEvent = EventHandler.trigger(this._element, EVENT_HIDE)
 
-    if (hideEvent.defaultPrevented) {
+    if (hideEvent?.defaultPrevented) {
       return
     }
 
@@ -189,7 +191,7 @@ class Modal extends BaseComponent {
     this._element.setAttribute('role', 'dialog')
     this._element.scrollTop = 0
 
-    const modalBody = SelectorEngine.findOne(SELECTOR_MODAL_BODY, this._dialog)
+    const modalBody = this._dialog ? SelectorEngine.findOne(SELECTOR_MODAL_BODY, this._dialog) : null
     if (modalBody) {
       modalBody.scrollTop = 0
     }
@@ -271,7 +273,7 @@ class Modal extends BaseComponent {
 
   _triggerBackdropTransition(): void {
     const hideEvent = EventHandler.trigger(this._element, EVENT_HIDE_PREVENTED)
-    if (hideEvent.defaultPrevented) {
+    if (hideEvent?.defaultPrevented) {
       return
     }
 
@@ -329,8 +331,12 @@ EventHandler.on(document, EVENT_CLICK_DATA_API, SELECTOR_DATA_TOGGLE, function (
     event.preventDefault()
   }
 
+  if (!target) {
+    return
+  }
+
   EventHandler.one(target, EVENT_SHOW, (showEvent: Event) => {
-    if (showEvent.defaultPrevented) {
+    if (showEvent?.defaultPrevented) {
       return
     }
 

core/js/src/bootstrap/offcanvas.ts

@@ -42,13 +42,13 @@ const EVENT_KEYDOWN_DISMISS = `keydown.dismiss${EVENT_KEY}`
 
 const SELECTOR_DATA_TOGGLE = '[data-bs-toggle="offcanvas"], [data-tblr-toggle="offcanvas"]'
 
-interface ComponentConfig {
-  [key: string]: any
+type ComponentConfig = {
+  backdrop: boolean | 'static'
+  keyboard: boolean
+  scroll: boolean
 }
 
-interface ComponentConfigType {
-  [key: string]: string
-}
+type ComponentConfigInput = Partial<ComponentConfig> & Record<string, unknown>
 
 const Default: ComponentConfig = {
   backdrop: true,
@@ -56,7 +56,7 @@ const Default: ComponentConfig = {
   scroll: false,
 }
 
-const DefaultType: ComponentConfigType = {
+const DefaultType: Record<keyof ComponentConfig, string> = {
   backdrop: '(boolean|string)',
   keyboard: 'boolean',
   scroll: 'boolean',
@@ -67,11 +67,13 @@ const DefaultType: ComponentConfigType = {
  */
 
 class Offcanvas extends BaseComponent {
+  declare _element: HTMLElement
+  declare _config: ComponentConfig
   _isShown: boolean
   _backdrop: Backdrop
   _focustrap: FocusTrap
 
-  constructor(element: HTMLElement | string, config?: Partial<ComponentConfig>) {
+  constructor(element: HTMLElement | string, config?: ComponentConfigInput) {
     super(element, config)
 
     this._isShown = false
@@ -84,7 +86,7 @@ class Offcanvas extends BaseComponent {
     return Default
   }
 
-  static get DefaultType(): ComponentConfigType {
+  static get DefaultType(): Record<keyof ComponentConfig, string> {
     return DefaultType
   }
 
@@ -103,7 +105,7 @@ class Offcanvas extends BaseComponent {
 
     const showEvent = EventHandler.trigger(this._element, EVENT_SHOW, { relatedTarget })
 
-    if (showEvent.defaultPrevented) {
+    if (showEvent?.defaultPrevented) {
       return
     }
 
@@ -138,7 +140,7 @@ class Offcanvas extends BaseComponent {
 
     const hideEvent = EventHandler.trigger(this._element, EVENT_HIDE)
 
-    if (hideEvent.defaultPrevented) {
+    if (hideEvent?.defaultPrevented) {
       return
     }
 
@@ -223,6 +225,10 @@ EventHandler.on(document, EVENT_CLICK_DATA_API, SELECTOR_DATA_TOGGLE, function (
     event.preventDefault()
   }
 
+  if (!target) {
+    return
+  }
+
   if (isDisabled(this)) {
     return
   }

core/js/src/bootstrap/popover.ts

@@ -6,6 +6,7 @@
  */
 
 import Tooltip from './tooltip'
+import type { TooltipConfig, TooltipContent, TooltipContentMap } from './tooltip'
 
 /**
  * Constants
@@ -16,13 +17,11 @@ const NAME = 'popover'
 const SELECTOR_TITLE = '.popover-header'
 const SELECTOR_CONTENT = '.popover-body'
 
-interface ComponentConfig {
-  [key: string]: any
+type ComponentConfig = TooltipConfig & {
+  content: TooltipContent
 }
 
-interface ComponentConfigType {
-  [key: string]: string
-}
+type ComponentConfigInput = Partial<ComponentConfig> & Record<string, unknown>
 
 const Default: ComponentConfig = {
   ...Tooltip.Default,
@@ -33,7 +32,7 @@ const Default: ComponentConfig = {
   trigger: 'click',
 }
 
-const DefaultType: ComponentConfigType = {
+const DefaultType: Record<keyof ComponentConfig, string> = {
   ...Tooltip.DefaultType,
   content: '(null|string|element|function)',
 }
@@ -43,11 +42,18 @@ const DefaultType: ComponentConfigType = {
  */
 
 class Popover extends Tooltip {
+  declare _element: HTMLElement
+  declare _config: ComponentConfig
+
+  constructor(element: HTMLElement | string, config?: ComponentConfigInput) {
+    super(element, config)
+  }
+
   static get Default(): ComponentConfig {
     return Default
   }
 
-  static get DefaultType(): ComponentConfigType {
+  static get DefaultType(): Record<keyof ComponentConfig, string> {
     return DefaultType
   }
 
@@ -59,14 +65,14 @@ class Popover extends Tooltip {
     return Boolean(this._getTitle() || this._getContent())
   }
 
-  _getContentForTemplate(): Record<string, any> {
+  _getContentForTemplate(): TooltipContentMap {
     return {
       [SELECTOR_TITLE]: this._getTitle(),
       [SELECTOR_CONTENT]: this._getContent(),
     }
   }
 
-  _getContent(): any {
+  _getContent(): string | HTMLElement | null {
     return this._resolvePossibleFunction(this._config.content)
   }
 }

core/js/src/bootstrap/scrollspy.ts

@@ -9,7 +9,16 @@ import BaseComponent from './base-component'
 import EventHandler from './dom/event-handler'
 import SelectorEngine from './dom/selector-engine'
 import { getElement, isDisabled, isVisible, parseSelector } from './util/index'
-import type { ComponentConfig, ComponentConfigType } from './types'
+
+type ComponentConfig = {
+  offset: number | null
+  rootMargin: string
+  smoothScroll: boolean
+  target: HTMLElement | null
+  threshold: number[]
+}
+
+type ComponentConfigInput = Partial<Omit<ComponentConfig, 'target' | 'threshold'>> & { target?: HTMLElement | string | null; threshold?: number[] | string } & Record<string, unknown>
 
 const NAME = 'scrollspy'
 const DATA_KEY = 'bs.scrollspy'
@@ -41,7 +50,7 @@ const Default: ComponentConfig = {
   threshold: [0.1, 0.5, 1],
 }
 
-const DefaultType: ComponentConfigType = {
+const DefaultType: Record<keyof ComponentConfig, string> = {
   offset: '(number|null)',
   rootMargin: 'string',
   smoothScroll: 'boolean',
@@ -50,6 +59,8 @@ const DefaultType: ComponentConfigType = {
 }
 
 class ScrollSpy extends BaseComponent {
+  declare _element: HTMLElement
+  declare _config: ComponentConfig
   _targetLinks: Map<string, HTMLElement>
   _observableSections: Map<string, HTMLElement>
   _rootElement: HTMLElement | null
@@ -60,7 +71,7 @@ class ScrollSpy extends BaseComponent {
     parentScrollTop: number
   }
 
-  constructor(element: HTMLElement | string, config?: Partial<ComponentConfig>) {
+  constructor(element: HTMLElement | string, config?: ComponentConfigInput) {
     super(element, config)
 
     this._targetLinks = new Map()
@@ -79,7 +90,7 @@ class ScrollSpy extends BaseComponent {
     return Default
   }
 
-  static get DefaultType(): ComponentConfigType {
+  static get DefaultType(): Record<keyof ComponentConfig, string> {
     return DefaultType
   }
 
@@ -112,8 +123,9 @@ class ScrollSpy extends BaseComponent {
 
     config.rootMargin = config.offset ? `${config.offset}px 0px -30%` : config.rootMargin
 
-    if (typeof config.threshold === 'string') {
-      config.threshold = config.threshold.split(',').map((value: string) => Number.parseFloat(value))
+    const threshold: unknown = config.threshold
+    if (typeof threshold === 'string') {
+      config.threshold = threshold.split(',').map((value: string) => Number.parseFloat(value))
     }
 
     return config

core/js/src/bootstrap/toast.ts

@@ -9,7 +9,15 @@ import BaseComponent from './base-component'
 import EventHandler from './dom/event-handler.js'
 import { enableDismissTrigger } from './util/component-functions'
 import { reflow } from './util/index.js'
-import type { ComponentConfig, ComponentConfigType, ElementSelector } from './types'
+import type { ElementSelector } from './types'
+
+type ComponentConfig = {
+  animation: boolean
+  autohide: boolean
+  delay: number
+}
+
+type ComponentConfigInput = Partial<ComponentConfig> & Record<string, unknown>
 
 const NAME = 'toast'
 const DATA_KEY = 'bs.toast'
@@ -29,7 +37,7 @@ const CLASS_NAME_HIDE = 'hide'
 const CLASS_NAME_SHOW = 'show'
 const CLASS_NAME_SHOWING = 'showing'
 
-const DefaultType: ComponentConfigType = {
+const DefaultType: Record<keyof ComponentConfig, string> = {
   animation: 'boolean',
   autohide: 'boolean',
   delay: 'number',
@@ -42,11 +50,13 @@ const Default: ComponentConfig = {
 }
 
 class Toast extends BaseComponent {
+  declare _element: HTMLElement
+  declare _config: ComponentConfig
   _timeout: ReturnType<typeof setTimeout> | null
   _hasMouseInteraction: boolean
   _hasKeyboardInteraction: boolean
 
-  constructor(element: ElementSelector, config?: ComponentConfig) {
+  constructor(element: ElementSelector, config?: ComponentConfigInput) {
     super(element, config)
 
     this._timeout = null
@@ -59,7 +69,7 @@ class Toast extends BaseComponent {
     return Default
   }
 
-  static get DefaultType(): ComponentConfigType {
+  static get DefaultType(): Record<keyof ComponentConfig, string> {
     return DefaultType
   }
 

core/js/src/bootstrap/tooltip.ts

@@ -12,6 +12,7 @@ import Manipulator from './dom/manipulator'
 import { execute, findShadowRoot, getElement, getUID, isRTL, noop } from './util/index'
 import { DefaultAllowlist } from './util/sanitizer'
 import TemplateFactory from './util/template-factory'
+import type { AllowList, SanitizeFn } from './types'
 
 /**
  * Constants
@@ -45,13 +46,41 @@ const EVENT_FOCUSOUT = 'focusout'
 const EVENT_MOUSEENTER = 'mouseenter'
 const EVENT_MOUSELEAVE = 'mouseleave'
 
-interface ComponentConfig {
-  [key: string]: any
+type PopperOffsetData = { placement: Popper.Placement; reference: Popper.Rect; popper: Popper.Rect }
+type PopperOffsetFunction = (popperData: PopperOffsetData) => number[]
+type PopperConfigFunction = (defaultConfig: Partial<Popper.Options>) => Partial<Popper.Options>
+
+export type TooltipDelay = number | { show: number; hide: number }
+export type TooltipContent = string | HTMLElement | null | ((this: HTMLElement, element: HTMLElement) => string | HTMLElement | null)
+// Keys are selectors inside the template, values the content for that slot
+export type TooltipContentMap = Record<string, TooltipContent>
+export type TooltipPlacement = string | ((this: Tooltip, tip: HTMLElement, element: HTMLElement) => string)
+
+export type TooltipConfig = {
+  allowList: AllowList
+  animation: boolean
+  boundary: Popper.Boundary
+  container: HTMLElement | string | false
+  customClass: string | ((this: HTMLElement, element: HTMLElement) => string)
+  delay: TooltipDelay
+  fallbackPlacements: string[]
+  html: boolean
+  offset: number[] | string | ((popperData: PopperOffsetData, element: HTMLElement) => number[])
+  placement: TooltipPlacement
+  popperConfig: Partial<Popper.Options> | PopperConfigFunction | null
+  sanitize: boolean
+  sanitizeFn: SanitizeFn | null
+  selector: string | false
+  template: string
+  title: TooltipContent
+  trigger: string
 }
 
-interface ComponentConfigType {
-  [key: string]: string
-}
+type ComponentConfig = TooltipConfig
+
+export type TooltipConfigInput = Partial<TooltipConfig> & Record<string, unknown>
+
+type ComponentConfigInput = TooltipConfigInput
 
 const AttachmentMap: Record<string, string> = {
   AUTO: 'auto',
@@ -81,7 +110,7 @@ const Default: ComponentConfig = {
   trigger: 'hover focus',
 }
 
-const DefaultType: ComponentConfigType = {
+const DefaultType: Record<keyof ComponentConfig, string> = {
   allowList: 'object',
   animation: 'boolean',
   boundary: '(string|element)',
@@ -106,17 +135,19 @@ const DefaultType: ComponentConfigType = {
  */
 
 class Tooltip extends BaseComponent {
+  declare _element: HTMLElement
+  declare _config: ComponentConfig
   _isEnabled: boolean
   _timeout: ReturnType<typeof setTimeout> | number
   _isHovered: boolean | null
   _activeTrigger: Record<string, boolean>
   _popper: Popper.Instance | null
   _templateFactory: TemplateFactory | null
-  _newContent: Record<string, any> | null
+  _newContent: TooltipContentMap | null
   tip: HTMLElement | null
-  _hideModalHandler: (() => void) | null
+  _hideModalHandler: () => void
 
-  constructor(element: HTMLElement | string, config?: Partial<ComponentConfig>) {
+  constructor(element: HTMLElement | string, config?: ComponentConfigInput) {
     if (typeof Popper === 'undefined') {
       throw new TypeError("Bootstrap's tooltips require Popper (https://popper.js.org/docs/v2/)")
     }
@@ -132,7 +163,11 @@ class Tooltip extends BaseComponent {
     this._newContent = null
 
     this.tip = null
-    this._hideModalHandler = null
+    this._hideModalHandler = () => {
+      if (this._element) {
+        this.hide()
+      }
+    }
 
     this._setListeners()
 
@@ -145,7 +180,7 @@ class Tooltip extends BaseComponent {
     return Default
   }
 
-  static get DefaultType(): ComponentConfigType {
+  static get DefaultType(): Record<keyof ComponentConfig, string> {
     return DefaultType
   }
 
@@ -204,29 +239,30 @@ class Tooltip extends BaseComponent {
     const shadowRoot = findShadowRoot(this._element)
     const isInTheDom = (shadowRoot || this._element.ownerDocument.documentElement).contains(this._element)
 
-    if (showEvent.defaultPrevented || !isInTheDom) {
+    if (showEvent?.defaultPrevented || !isInTheDom) {
       return
     }
 
     this._disposePopper()
 
-    const tip = this._getTipElement()
+    const tip = this._getTipElement()!
 
-    this._element.setAttribute('aria-describedby', tip!.getAttribute('id')!)
+    this._element.setAttribute('aria-describedby', tip.getAttribute('id')!)
 
     const { container } = this._config
 
     if (!this._element.ownerDocument.documentElement.contains(this.tip)) {
-      container.append(tip)
+      // `_configAfterMerge` resolved the container to an element
+      ;(container as HTMLElement).append(tip)
       EventHandler.trigger(this._element, (this.constructor as typeof Tooltip).eventName(EVENT_INSERTED))
     }
 
-    this._popper = this._createPopper(tip!)
+    this._popper = this._createPopper(tip)
 
     tip!.classList.add(CLASS_NAME_SHOW)
 
     if ('ontouchstart' in document.documentElement) {
-      for (const element of [].concat(...(document.body.children as any))) {
+      for (const element of Array.from(document.body.children)) {
         EventHandler.on(element, 'mouseover', noop)
       }
     }
@@ -250,7 +286,7 @@ class Tooltip extends BaseComponent {
     }
 
     const hideEvent = EventHandler.trigger(this._element, (this.constructor as typeof Tooltip).eventName(EVENT_HIDE))
-    if (hideEvent.defaultPrevented) {
+    if (hideEvent?.defaultPrevented) {
       return
     }
 
@@ -258,7 +294,7 @@ class Tooltip extends BaseComponent {
     tip!.classList.remove(CLASS_NAME_SHOW)
 
     if ('ontouchstart' in document.documentElement) {
-      for (const element of [].concat(...(document.body.children as any))) {
+      for (const element of Array.from(document.body.children)) {
         EventHandler.off(element, 'mouseover', noop)
       }
     }
@@ -302,7 +338,7 @@ class Tooltip extends BaseComponent {
     return this.tip
   }
 
-  _createTipElement(content: Record<string, any>): HTMLElement | null {
+  _createTipElement(content: TooltipContentMap): HTMLElement | null {
     const tip = this._getTemplateFactory(content).toHtml() as HTMLElement
 
     if (!tip) {
@@ -323,7 +359,7 @@ class Tooltip extends BaseComponent {
     return tip
   }
 
-  setContent(content: Record<string, any>): void {
+  setContent(content: TooltipContentMap): void {
     this._newContent = content
     if (this._isShown()) {
       this._disposePopper()
@@ -331,7 +367,7 @@ class Tooltip extends BaseComponent {
     }
   }
 
-  _getTemplateFactory(content: Record<string, any>): TemplateFactory {
+  _getTemplateFactory(content: TooltipContentMap): TemplateFactory {
     if (this._templateFactory) {
       this._templateFactory.changeContent(content)
     } else {
@@ -345,13 +381,13 @@ class Tooltip extends BaseComponent {
     return this._templateFactory
   }
 
-  _getContentForTemplate(): Record<string, any> {
+  _getContentForTemplate(): TooltipContentMap {
     return {
       [SELECTOR_TOOLTIP_INNER]: this._getTitle(),
     }
   }
 
-  _getTitle(): string {
+  _getTitle(): string | HTMLElement {
     return this._resolvePossibleFunction(this._config.title) || this._element.getAttribute('data-bs-original-title') || this._element.getAttribute('data-tblr-original-title') || ''
   }
 
@@ -373,7 +409,7 @@ class Tooltip extends BaseComponent {
     return Popper.createPopper(this._element, tip, this._getPopperConfig(attachment))
   }
 
-  _getOffset(): number[] | ((popperData: any) => number[]) {
+  _getOffset(): number[] | PopperOffsetFunction {
     const { offset } = this._config
 
     if (typeof offset === 'string') {
@@ -381,14 +417,14 @@ class Tooltip extends BaseComponent {
     }
 
     if (typeof offset === 'function') {
-      return (popperData: any) => (offset as Function)(popperData, this._element)
+      return (popperData: PopperOffsetData) => offset(popperData, this._element)
     }
 
-    return offset as number[]
+    return offset
   }
 
-  _resolvePossibleFunction(arg: any): any {
-    return execute(arg, [this._element, this._element])
+  _resolvePossibleFunction<T>(arg: T | ((this: HTMLElement, element: HTMLElement) => T)): T {
+    return execute(arg, [this._element, this._element]) as T
   }
 
   _getPopperConfig(attachment: string): Partial<Popper.Options> {
@@ -423,7 +459,7 @@ class Tooltip extends BaseComponent {
           name: 'preSetPlacement',
           enabled: true,
           phase: 'beforeMain',
-          fn: (data: any) => {
+          fn: (data: Popper.ModifierArguments<Record<string, unknown>>) => {
             this._getTipElement()!.setAttribute('data-popper-placement', data.state.placement)
           },
         },
@@ -465,12 +501,6 @@ class Tooltip extends BaseComponent {
       }
     }
 
-    this._hideModalHandler = () => {
-      if (this._element) {
-        this.hide()
-      }
-    }
-
     EventHandler.on(this._element.closest(SELECTOR_MODAL), EVENT_MODAL_HIDE, this._hideModalHandler)
   }
 
@@ -501,7 +531,7 @@ class Tooltip extends BaseComponent {
       if (this._isHovered) {
         this.show()
       }
-    }, this._config.delay.show)
+    }, this._getDelay().show)
   }
 
   _leave(): void {
@@ -515,7 +545,12 @@ class Tooltip extends BaseComponent {
       if (!this._isHovered) {
         this.hide()
       }
-    }, this._config.delay.hide)
+    }, this._getDelay().hide)
+  }
+
+  _getDelay(): { show: number; hide: number } {
+    const { delay } = this._config
+    return typeof delay === 'number' ? { show: delay, hide: delay } : delay
   }
 
   _setTimeout(handler: () => void, timeout: number): void {
@@ -527,7 +562,7 @@ class Tooltip extends BaseComponent {
     return Object.values(this._activeTrigger).includes(true)
   }
 
-  _getConfig(config: Partial<ComponentConfig>): ComponentConfig {
+  _getConfig(config?: ComponentConfigInput): ComponentConfig {
     const dataAttributes = Manipulator.getDataAttributes(this._element)
 
     for (const dataAttribute of Object.keys(dataAttributes)) {
@@ -536,18 +571,18 @@ class Tooltip extends BaseComponent {
       }
     }
 
-    config = {
+    let merged: Record<string, unknown> = {
       ...dataAttributes,
       ...(typeof config === 'object' && config ? config : {}),
     }
-    config = this._mergeConfigObj(config)
-    config = this._configAfterMerge(config)
-    this._typeCheckConfig(config)
-    return config
+    merged = this._mergeConfigObj(merged)
+    merged = this._configAfterMerge(merged as ComponentConfig)
+    this._typeCheckConfig(merged)
+    return merged as ComponentConfig
   }
 
   _configAfterMerge(config: ComponentConfig): ComponentConfig {
-    config.container = config.container === false ? document.body : getElement(config.container)
+    config.container = config.container === false ? document.body : (getElement(config.container) as HTMLElement)
 
     if (typeof config.delay === 'number') {
       config.delay = {
@@ -556,22 +591,25 @@ class Tooltip extends BaseComponent {
       }
     }
 
-    if (typeof config.title === 'number') {
-      config.title = config.title.toString()
+    // Numbers are accepted at runtime (`data-bs-title="42"`) even though the type says string
+    const raw = config as Record<string, unknown>
+    if (typeof raw.title === 'number') {
+      raw.title = raw.title.toString()
     }
 
-    if (typeof config.content === 'number') {
-      config.content = config.content.toString()
+    if (typeof raw.content === 'number') {
+      raw.content = raw.content.toString()
     }
 
     return config
   }
 
-  _getDelegateConfig(): Partial<ComponentConfig> {
-    const config: Partial<ComponentConfig> = {}
+  _getDelegateConfig(): ComponentConfigInput {
+    const config: Record<string, unknown> = {}
+    const defaults = (this.constructor as typeof Tooltip).Default as Record<string, unknown>
 
     for (const [key, value] of Object.entries(this._config)) {
-      if ((this.constructor as typeof Tooltip).Default[key] !== value) {
+      if (defaults[key] !== value) {
         config[key] = value
       }
     }

core/js/src/bootstrap/types.ts

@@ -5,7 +5,7 @@
  * --------------------------------------------------------------------------
  */
 
-export type ComponentConfig = Record<string, any>
+export type ComponentConfig = Record<string, unknown>
 
 export type ComponentConfigType = Record<string, string>
 

core/js/src/bootstrap/util/backdrop.ts

@@ -15,7 +15,7 @@ const CLASS_NAME_FADE = 'fade'
 const CLASS_NAME_SHOW = 'show'
 const EVENT_MOUSEDOWN = `mousedown.bs.${NAME}`
 
-interface BackdropConfig {
+type BackdropConfig = {
   className: string
   clickCallback: (() => void) | null
   isAnimated: boolean

core/js/src/bootstrap/util/component-functions.ts

@@ -9,11 +9,34 @@ import EventHandler from '../dom/event-handler.js'
 import SelectorEngine from '../dom/selector-engine.js'
 import { isDisabled } from './index'
 
+type ComponentInstance = unknown
+
+interface PluginComponent {
+  NAME: string
+  getOrCreateInstance(element: HTMLElement | string | null): ComponentInstance
+}
+
+interface EventActionData {
+  targets: HTMLElement[]
+  event: Event
+}
+
+interface PluginEventActionData extends EventActionData {
+  instances: ComponentInstance[]
+}
+
 interface DismissibleComponent {
   EVENT_KEY: string
   NAME: string
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  getOrCreateInstance(element: HTMLElement | string | null): any
+  getOrCreateInstance(element: HTMLElement | string | null): ComponentInstance
+}
+
+const callMethod = (instance: ComponentInstance, method: string): void => {
+  const callable = (instance as Record<string, unknown>)[method]
+
+  if (typeof callable === 'function') {
+    callable.call(instance)
+  }
 }
 
 const enableDismissTrigger = (component: DismissibleComponent, method = 'hide'): void => {
@@ -30,10 +53,37 @@ const enableDismissTrigger = (component: DismissibleComponent, method = 'hide'):
     }
 
     const target = SelectorEngine.getElementFromSelector(this) || this.closest(`.${name}`)
-    const instance = component.getOrCreateInstance(target)
-
-    instance[method]()
+    callMethod(component.getOrCreateInstance(target), method)
   })
 }
 
-export { enableDismissTrigger }
+const eventAction = (onEvent: string, stringSelector: string, callback: (data: EventActionData) => void): void => {
+  const selector = `${stringSelector}:not(.disabled):not(:disabled)`
+
+  EventHandler.on(document, onEvent, selector, function (this: HTMLElement, event: Event) {
+    if (['A', 'AREA'].includes(this.tagName)) {
+      event.preventDefault()
+    }
+
+    const targetSelector = SelectorEngine.getSelectorFromElement(this)
+    const targets = targetSelector ? SelectorEngine.find(targetSelector) : [this]
+
+    callback({ targets, event })
+  })
+}
+
+const eventActionOnPlugin = (Plugin: PluginComponent, onEvent: string, stringSelector: string, method: string, callback: ((data: PluginEventActionData) => void) | null = null): void => {
+  eventAction(`${onEvent}.${Plugin.NAME}`, stringSelector, (data) => {
+    const instances = data.targets.filter(Boolean).map((element) => Plugin.getOrCreateInstance(element))
+
+    if (typeof callback === 'function') {
+      callback({ ...data, instances })
+    }
+
+    for (const instance of instances) {
+      callMethod(instance, method)
+    }
+  })
+}
+
+export { enableDismissTrigger, eventAction, eventActionOnPlugin }

core/js/src/bootstrap/util/focustrap.ts

@@ -20,7 +20,7 @@ const TAB_KEY = 'Tab'
 const TAB_NAV_FORWARD = 'forward'
 const TAB_NAV_BACKWARD = 'backward'
 
-interface FocusTrapConfig {
+type FocusTrapConfig = {
   autofocus: boolean
   trapElement: HTMLElement | null
 }
@@ -87,7 +87,7 @@ class FocusTrap extends Config {
   _handleFocusin(event: FocusEvent): void {
     const { trapElement } = this._config
 
-    if (event.target === document || event.target === trapElement || trapElement!.contains(event.target as Node)) {
+    if (!trapElement || event.target === document || event.target === trapElement || trapElement.contains(event.target as Node)) {
       return
     }
 

core/js/src/bootstrap/util/index.ts

@@ -10,7 +10,7 @@ const MILLISECONDS_MULTIPLIER = 1000
 const TRANSITION_END = 'transitionend'
 
 const parseSelector = (selector: string): string => {
-  if (selector && window.CSS && window.CSS.escape) {
+  if (selector && typeof CSS !== 'undefined' && typeof CSS.escape === 'function') {
     selector = selector.replace(/#([^\s"#']+)/g, (match, id) => `#${CSS.escape(id)}`)
   }
 

core/js/src/bootstrap/util/swipe.ts

@@ -22,7 +22,7 @@ const POINTER_TYPE_PEN = 'pen'
 const CLASS_NAME_POINTER_EVENT = 'pointer-event'
 const SWIPE_THRESHOLD = 40
 
-interface SwipeConfig {
+type SwipeConfig = {
   endCallback: (() => void) | null
   leftCallback: (() => void) | null
   rightCallback: (() => void) | null
@@ -43,8 +43,8 @@ const DefaultType: ComponentConfigType = {
 class Swipe extends Config {
   declare _config: SwipeConfig & ComponentConfig
   _element: HTMLElement
-  _deltaX: number
-  _supportPointerEvents: boolean
+  declare _deltaX: number
+  declare _supportPointerEvents: boolean
 
   constructor(element: HTMLElement, config?: ComponentConfig) {
     super()

core/js/src/bootstrap/util/template-factory.ts

@@ -13,7 +13,7 @@ import type { AllowList, ComponentConfig, ComponentConfigType, SanitizeFn } from
 
 const NAME = 'TemplateFactory'
 
-interface TemplateFactoryConfig {
+type TemplateFactoryConfig = {
   allowList: AllowList
   content: Record<string, unknown>
   extraClass: string | (() => string)
@@ -104,7 +104,7 @@ class TemplateFactory extends Config {
 
   _typeCheckConfig(config: ComponentConfig): void {
     super._typeCheckConfig(config)
-    this._checkContent(config.content)
+    this._checkContent(config.content as Record<string, unknown>)
   }
 
   _checkContent(arg: Record<string, unknown>): void {

core/js/src/countup.ts

@@ -3,7 +3,7 @@ const countupElements: NodeListOf<HTMLElement> = document.querySelectorAll<HTMLE
 
 if (countupElements.length) {
   countupElements.forEach(function (element: HTMLElement) {
-    let options: Record<string, any> = {}
+    let options: Record<string, unknown> = {}
     try {
       const dataOptions = element.getAttribute('data-countup') ? JSON.parse(element.getAttribute('data-countup')!) : {}
       options = Object.assign(

core/js/src/dropdown.ts

@@ -4,7 +4,7 @@ import { Dropdown } from './bootstrap'
 const dropdownTriggerList: HTMLElement[] = [].slice.call(document.querySelectorAll<HTMLElement>('[data-bs-toggle="dropdown"]'))
 dropdownTriggerList.map(function (dropdownTriggerEl: HTMLElement) {
   const options = {
-    boundary: dropdownTriggerEl.getAttribute('data-bs-boundary') === 'viewport' ? document.documentElement : 'clippingParents',
+    boundary: dropdownTriggerEl.getAttribute('data-bs-boundary') === 'viewport' ? document.documentElement : ('clippingParents' as const),
   }
   return new Dropdown(dropdownTriggerEl, options)
 })

core/js/src/global.d.ts

@@ -4,12 +4,12 @@ interface Window {
     CountUp: new (
       target: HTMLElement,
       endVal: number,
-      options?: any,
+      options?: Record<string, unknown>,
     ) => {
       error: boolean
       start: () => void
     }
   }
-  IMask?: new (element: HTMLElement, options: { mask: string; lazy?: boolean }) => any
-  Sortable?: new (element: HTMLElement, options?: any) => any
+  IMask?: new (element: HTMLElement, options: { mask: string; lazy?: boolean }) => unknown
+  Sortable?: new (element: HTMLElement, options?: Record<string, unknown>) => unknown
 }

core/js/src/input-mask.ts

@@ -3,7 +3,7 @@ const maskElementList: HTMLElement[] = [].slice.call(document.querySelectorAll<H
 maskElementList.map(function (maskEl: HTMLElement) {
   window.IMask &&
     new window.IMask(maskEl, {
-      mask: maskEl.dataset.mask,
+      mask: maskEl.dataset.mask as string,
       lazy: maskEl.dataset.maskVisible !== 'true',
     })
 })

core/js/src/sortable.ts

@@ -5,7 +5,7 @@ const sortableElements: NodeListOf<HTMLElement> = document.querySelectorAll<HTML
 
 if (sortableElements.length) {
   sortableElements.forEach(function (element: HTMLElement) {
-    let options: Record<string, any> = {}
+    let options: Record<string, unknown> = {}
 
     try {
       const rawOptions = element.getAttribute('data-sortable')

core/js/tabler-theme.ts

@@ -5,14 +5,12 @@
  */
 import { themeDefaults, type ThemeKey } from './src/theme-config'
 
-const params = new Proxy(new URLSearchParams(window.location.search), {
-  get: (searchParams: URLSearchParams, prop: string): string | null => searchParams.get(prop),
-})
+const params = new URLSearchParams(window.location.search)
 
 const prefersDark = window.matchMedia('(prefers-color-scheme: dark)')
 
 for (const key in themeDefaults) {
-  const param = params[key]
+  const param = params.get(key)
   let selectedValue: string
 
   if (!!param) {

core/js/tests/unit/util/component-functions.spec.ts

@@ -1,6 +1,6 @@
 import { describe, it, expect, beforeAll, afterEach, vi } from 'vitest'
 import BaseComponent from '../../../src/bootstrap/base-component'
-import { enableDismissTrigger } from '../../../src/bootstrap/util/component-functions'
+import { enableDismissTrigger, eventActionOnPlugin } from '../../../src/bootstrap/util/component-functions'
 import { clearFixture, createEvent, getFixture } from '../../helpers/fixture'
 
 class DummyClass extends BaseComponent {
@@ -85,4 +85,64 @@ describe('Component Functions', () => {
       vi.restoreAllMocks()
     })
   })
+
+  describe('eventActionOnPlugin', () => {
+    it('should get plugin for the trigger element and execute given method on click', () => {
+      fixtureEl.innerHTML = '<button type="button" data-bs-toggle="test"></button>'
+
+      const spyGet = vi.spyOn(DummyClass, 'getOrCreateInstance')
+      const spyTest = vi.spyOn(DummyClass.prototype, 'testMethod')
+
+      eventActionOnPlugin(DummyClass, 'click', '[data-bs-toggle="test"]', 'testMethod')
+      fixtureEl.querySelector('[data-bs-toggle="test"]')!.dispatchEvent(createEvent('click'))
+
+      expect(spyGet).toHaveBeenCalledWith(fixtureEl.querySelector('[data-bs-toggle="test"]'))
+      expect(spyTest).toHaveBeenCalled()
+
+      vi.restoreAllMocks()
+    })
+
+    it('should resolve targets from data-bs-target and call the callback with instances', () => {
+      fixtureEl.innerHTML = ['<button type="button" data-bs-toggle="test2" data-bs-target=".target"></button>', '<div class="target"></div>', '<div class="target"></div>'].join('')
+
+      const spyTest = vi.spyOn(DummyClass.prototype, 'testMethod')
+      const callback = vi.fn()
+
+      eventActionOnPlugin(DummyClass, 'click', '[data-bs-toggle="test2"]', 'testMethod', callback)
+      fixtureEl.querySelector('[data-bs-toggle="test2"]')!.dispatchEvent(createEvent('click'))
+
+      expect(spyTest).toHaveBeenCalledTimes(2)
+      expect(callback).toHaveBeenCalledTimes(1)
+      expect(callback.mock.calls[0][0].instances).toHaveLength(2)
+      expect(callback.mock.calls[0][0].targets).toEqual([...fixtureEl.querySelectorAll('.target')])
+
+      vi.restoreAllMocks()
+    })
+
+    it('should not trigger if disabled', () => {
+      fixtureEl.innerHTML = '<button type="button" disabled data-bs-toggle="test3"></button>'
+
+      const spy = vi.spyOn(DummyClass, 'getOrCreateInstance')
+
+      eventActionOnPlugin(DummyClass, 'click', '[data-bs-toggle="test3"]', 'testMethod')
+      fixtureEl.querySelector('[data-bs-toggle="test3"]')!.dispatchEvent(createEvent('click'))
+
+      expect(spy).not.toHaveBeenCalled()
+
+      vi.restoreAllMocks()
+    })
+
+    it('should preventDefault for <a> elements', () => {
+      fixtureEl.innerHTML = '<a href="#" data-bs-toggle="test4"></a>'
+
+      const preventSpy = vi.spyOn(Event.prototype, 'preventDefault')
+
+      eventActionOnPlugin(DummyClass, 'click', '[data-bs-toggle="test4"]', 'testMethod')
+      fixtureEl.querySelector('[data-bs-toggle="test4"]')!.dispatchEvent(createEvent('click'))
+
+      expect(preventSpy).toHaveBeenCalled()
+
+      vi.restoreAllMocks()
+    })
+  })
 })

core/tsconfig.json

@@ -6,7 +6,7 @@
     "moduleResolution": "bundler",
     "esModuleInterop": true,
     "allowSyntheticDefaultImports": true,
-    "strict": false,
+    "strict": true,
     "skipLibCheck": true,
     "forceConsistentCasingInFileNames": true,
     "resolveJsonModule": true,
@@ -17,14 +17,6 @@
     "sourceMap": true,
     "allowJs": true
   },
-  "include": [
-    "js/**/*"
-  ],
-  "exclude": [
-    "node_modules",
-    "dist",
-    "**/*.test.ts",
-    "**/*.spec.ts"
-  ]
+  "include": ["js/**/*"],
+  "exclude": ["node_modules", "dist", "**/*.test.ts", "**/*.spec.ts"]
 }
-