Replace the autosize package with an own implementation (#3052)

.changeset/autosize-own.md

@@ -0,0 +1,6 @@
+---
+"@tabler/core": patch
+"@tabler/docs": patch
+---
+
+Replaced the `autosize` package with a dependency-free `Autosize` component that fires `resized.bs.autosize`.

core/js/src/autosize.ts

@@ -5,9 +5,8 @@
  * --------------------------------------------------------------------------
  */
 
-import autosize from 'autosize'
-
 import BaseComponent from './bootstrap/base-component'
+import EventHandler from './bootstrap/dom/event-handler'
 import SelectorEngine from './bootstrap/dom/selector-engine'
 import type { ElementSelector } from './bootstrap/types'
 
@@ -20,6 +19,10 @@ type ComponentConfigInput = Record<string, unknown>
  */
 
 const NAME = 'autosize'
+const DATA_KEY = `bs.${NAME}`
+const EVENT_KEY = `.${DATA_KEY}`
+
+const EVENT_RESIZED = `resized${EVENT_KEY}`
 
 const SELECTOR_DATA_TOGGLE = `[data-bs-toggle="${NAME}"], [data-tblr-toggle="${NAME}"]`
 
@@ -30,20 +33,47 @@ const DefaultType: Record<keyof ComponentConfig, string> = {}
 /**
  * Class definition
  *
- * Wraps the `autosize` plugin (https://github.com/jackmoore/autosize), bundled
- * with `tabler.js`.
+ * Grows a textarea with its content and shrinks it back when text is removed.
+ * The height follows `scrollHeight`, so `rows` sets the starting height and
+ * `max-height` caps the growth, after which the field scrolls again.
  */
 
 class Autosize extends BaseComponent {
   declare _element: HTMLTextAreaElement
   declare _config: ComponentConfig
+  _observer: ResizeObserver | null = null
+  _inlineStyle = ''
+  _width = 0
+  _onInput = (): void => this.update()
 
   constructor(element: ElementSelector, config?: ComponentConfigInput) {
     super(element, config)
 
-    if (this._element) {
-      autosize(this._element)
+    if (!this._element) {
+      return
     }
+
+    this._inlineStyle = this._element.getAttribute('style') ?? ''
+    this._element.style.resize = 'none'
+    this._element.style.overflowY = 'hidden'
+
+    // `input` is not in EventHandler's list of native events, so it is bound
+    // directly.
+    this._element.addEventListener('input', this._onInput)
+
+    // Text wraps differently when the field changes width (a resized window,
+    // a collapsing sidebar), so the height is measured again then.
+    if (typeof ResizeObserver !== 'undefined') {
+      this._observer = new ResizeObserver(() => {
+        if (this._element.offsetWidth !== this._width) {
+          this._width = this._element.offsetWidth
+          this.update()
+        }
+      })
+      this._observer.observe(this._element)
+    }
+
+    this.update()
   }
 
   // Getters
@@ -61,11 +91,40 @@ class Autosize extends BaseComponent {
 
   // Public
   update(): void {
-    autosize.update(this._element)
+    const element = this._element
+    if (!element.isConnected || element.offsetParent === null) {
+      return
+    }
+
+    // Collapsing the field to measure it can move the page; the scroll
+    // position is put back afterwards.
+    const { scrollTop } = document.documentElement
+    const style = getComputedStyle(element)
+    const border = style.boxSizing === 'border-box' ? Number.parseFloat(style.borderTopWidth) + Number.parseFloat(style.borderBottomWidth) : 0
+    const before = element.style.height
+
+    element.style.height = 'auto'
+    const height = `${element.scrollHeight + border}px`
+    element.style.height = height
+
+    // Past max-height the content no longer fits, so let the field scroll.
+    element.style.overflowY = element.scrollHeight > element.clientHeight ? 'auto' : 'hidden'
+    document.documentElement.scrollTop = scrollTop
+
+    if (height !== before) {
+      EventHandler.trigger(element, EVENT_RESIZED)
+    }
   }
 
   dispose(): void {
-    autosize.destroy(this._element)
+    this._element.removeEventListener('input', this._onInput)
+    this._observer?.disconnect()
+    if (this._inlineStyle) {
+      this._element.setAttribute('style', this._inlineStyle)
+    } else {
+      this._element.removeAttribute('style')
+    }
+
     super.dispose()
   }
 }

core/js/src/global.d.ts

@@ -1,17 +1,3 @@
-// The `autosize` package ships no type definitions
-declare module 'autosize' {
-  type AutosizeTarget = Element | ArrayLike<Element>
-
-  interface Autosize {
-    (target: AutosizeTarget): AutosizeTarget
-    update(target: AutosizeTarget): AutosizeTarget
-    destroy(target: AutosizeTarget): AutosizeTarget
-  }
-
-  const autosize: Autosize
-  export default autosize
-}
-
 // IMask (https://imask.js.org) is loaded separately, not bundled
 interface IMaskInstance {
   value: string

core/js/tests/unit/autosize.spec.ts

@@ -1,14 +1,7 @@
 import { describe, it, expect, beforeAll, beforeEach, afterEach, vi } from 'vitest'
-import autosize from 'autosize'
 import { clearFixture, getFixture } from '../helpers/fixture'
 import Autosize from '../../src/autosize'
 
-vi.mock('autosize', () => ({
-  default: Object.assign(vi.fn(), { update: vi.fn(), destroy: vi.fn() }),
-}))
-
-const plugin = vi.mocked(autosize)
-
 describe('Autosize', () => {
   let fixtureEl: HTMLElement
 
@@ -17,8 +10,7 @@ describe('Autosize', () => {
   })
 
   beforeEach(() => {
-    vi.clearAllMocks()
-    fixtureEl.innerHTML = '<textarea data-bs-toggle="autosize"></textarea>'
+    fixtureEl.innerHTML = '<textarea data-bs-toggle="autosize" rows="1" style="width: 200px; line-height: 20px; padding: 0; border: 0; box-sizing: border-box"></textarea>'
   })
 
   afterEach(() => {
@@ -26,6 +18,8 @@ describe('Autosize', () => {
   })
 
   const textarea = (): HTMLTextAreaElement => fixtureEl.querySelector('textarea')!
+  const lines = (count: number): string => Array.from({ length: count }, (_, i) => `line ${i + 1}`).join('\n')
+  const height = (): number => Number.parseFloat(textarea().style.height)
 
   describe('NAME', () => {
     it('should return plugin name', () => {
@@ -34,41 +28,73 @@ describe('Autosize', () => {
   })
 
   describe('constructor', () => {
-    it('should call the autosize plugin with the element', () => {
+    it('should size the field to its content and hide the resize handle', () => {
+      textarea().value = lines(4)
       const instance = new Autosize(textarea())
 
-      expect(plugin).toHaveBeenCalledWith(textarea())
       expect(Autosize.getInstance(textarea())).toBe(instance)
+      expect(height()).toBe(80)
+      expect(textarea().style.resize).toBe('none')
+      expect(textarea().style.overflowY).toBe('hidden')
+    })
+  })
+
+  describe('input', () => {
+    it('should grow and shrink with the text', () => {
+      new Autosize(textarea())
+      const initial = height()
+
+      textarea().value = lines(3)
+      textarea().dispatchEvent(new Event('input'))
+      expect(height()).toBe(60)
+
+      textarea().value = ''
+      textarea().dispatchEvent(new Event('input'))
+      expect(height()).toBe(initial)
+    })
+
+    it('should fire resized.bs.autosize when the height changes', () => {
+      new Autosize(textarea())
+      const spy = vi.fn()
+      textarea().addEventListener('resized.bs.autosize', spy)
+
+      textarea().value = lines(2)
+      textarea().dispatchEvent(new Event('input'))
+      textarea().dispatchEvent(new Event('input'))
+
+      expect(spy).toHaveBeenCalledTimes(1)
     })
   })
 
   describe('update', () => {
-    it('should call autosize.update with the element', () => {
+    it('should scroll again past max-height', () => {
+      textarea().style.maxHeight = '40px'
       const instance = new Autosize(textarea())
+
+      textarea().value = lines(5)
       instance.update()
 
-      expect(plugin.update).toHaveBeenCalledWith(textarea())
+      expect(textarea().clientHeight).toBe(40)
+      expect(textarea().style.overflowY).toBe('auto')
+    })
+
+    it('should include the border when the box is border-box', () => {
+      textarea().style.border = '3px solid red'
+      textarea().value = lines(2)
+      new Autosize(textarea())
+
+      expect(height()).toBe(46)
     })
   })
 
   describe('dispose', () => {
-    it('should call autosize.destroy and remove the instance', () => {
+    it('should restore the inline style and remove the instance', () => {
+      const style = textarea().getAttribute('style')
       const instance = new Autosize(textarea())
-      const element = textarea()
       instance.dispose()
 
-      expect(plugin.destroy).toHaveBeenCalledWith(element)
-      expect(Autosize.getInstance(element)).toBeNull()
-    })
-  })
-
-  describe('getOrCreateInstance', () => {
-    it('should reuse the instance and not initialise the plugin twice', () => {
-      const first = Autosize.getOrCreateInstance(textarea())
-      const second = Autosize.getOrCreateInstance(textarea())
-
-      expect(second).toBe(first)
-      expect(plugin).toHaveBeenCalledTimes(1)
+      expect(textarea().getAttribute('style')).toBe(style)
+      expect(Autosize.getInstance(textarea())).toBeNull()
     })
   })
 })

core/libs.json

@@ -5,12 +5,6 @@
       "dist/imask.min.js"
     ]
   },
-  "autosize": {
-    "npm": "autosize",
-    "js": [
-      "dist/autosize.min.js"
-    ]
-  },
   "apexcharts": {
     "npm": "apexcharts",
     "js": [

core/package.json

@@ -249,10 +249,8 @@
     "@melloware/coloris": "^0.25.0",
     "@types/node": "^26.4.0",
     "@vitest/browser-playwright": "4.1.11",
-    "playwright": "1.62.1",
     "@vitest/coverage-istanbul": "4.1.11",
     "apexcharts": "7.0.0",
-    "autosize": "^6.0.1",
     "choices.js": "^11.2.4",
     "clipboard": "^2.0.11",
     "countup.js": "^2.10.1",
@@ -268,10 +266,11 @@
     "list.js": "^2.3.1",
     "litepicker": "^2.0.12",
     "nouislider": "^15.8.1",
+    "playwright": "1.62.1",
     "plyr": "^3.8.4",
-    "signature_pad": "^5.1.4",
     "sass": "1.103.1",
     "sass-true": "^10.1.0",
+    "signature_pad": "^5.1.4",
     "sortablejs": "^1.15.7",
     "star-rating.js": "^4.3.1",
     "tom-select": "^2.6.2",

docs/content/ui/plugins/autosize.mdx

@@ -1,7 +1,7 @@
 ---
 title: Autosize
 summary: The autosize element will automatically adjust the textarea height and make it easier for users to follow as they type.
-description: Make textareas grow automatically as users type with the autosize plugin, so longer text stays visible without manual resizing.
+description: Make textareas grow automatically as users type with autosize, so longer text stays visible without manual resizing.
 related: [/ui/forms/elements]
 ---
 import Example from '@components/Example.astro';
@@ -9,7 +9,7 @@ import CodeDocs from '@components/CodeDocs.astro';
 
 ## Overview
 
-A textarea keeps its height no matter how much text it holds, so long answers end up in a small scrolling box. The [autosize](https://github.com/jackmoore/autosize) plugin grows the field as the user types and shrinks it again when text is removed.
+A textarea keeps its height no matter how much text it holds, so long answers end up in a small scrolling box. Autosize grows the field as the user types and shrinks it again when text is removed.
 
 <Example column vertical>
 <label class="form-label">Autosize example</label> <textarea class="form-control" data-bs-toggle="autosize" placeholder="Type something…"></textarea>
@@ -17,7 +17,7 @@ A textarea keeps its height no matter how much text it holds, so long answers en
 
 ## Installation
 
-The plugin is bundled with `tabler.js`, so there is nothing extra to install or load. It only changes the height of the field, so it needs no CSS of its own.
+Autosize is part of `tabler.js` and has no dependency, so there is nothing extra to install or load. It only sets the height of the field, so it needs no CSS of its own.
 
 ## Usage
 
@@ -27,11 +27,15 @@ Add `data-bs-toggle="autosize"` to a textarea. Tabler picks it up on page load,
 <label class="form-label">Message</label> <textarea class="form-control" data-bs-toggle="autosize" rows="1" placeholder="Write a message…"></textarea>
 </Example>
 
-Set `rows` to choose the starting height. With `rows="1"` the field starts as a single line and grows from there.
+Set `rows` to choose the starting height. With `rows="1"` the field starts as a single line and grows from there. Set a `max-height` to cap the growth; past it the field scrolls again.
+
+<Example column vertical>
+<label class="form-label">Notes, at most four lines</label> <textarea class="form-control" data-bs-toggle="autosize" rows="2" style="max-height: 6.5rem" placeholder="Keep typing to see the field stop growing…"></textarea>
+</Example>
 
 ## JavaScript
 
-Tabler wraps the plugin in an `Autosize` component that works like the Bootstrap components: it is created once per element and stored on it. On page load Tabler creates one for every element with `data-bs-toggle="autosize"`. This is the code that runs:
+Tabler ships an `Autosize` component that works like the Bootstrap components: it is created once per element and stored on it. On page load Tabler creates one for every element with `data-bs-toggle="autosize"`. It sets the height from the content on every `input` event and again when the field changes width. This is the code that runs:
 
 <CodeDocs name="autosize-init" file="core/js/src/autosize.ts" />
 
@@ -43,13 +47,13 @@ const autosize = new tabler.Autosize(document.getElementById('message'));
 
 `tabler.Autosize.getOrCreateInstance(element)` returns the existing component or creates a new one, so it is safe to call more than once for the same field.
 
-Autosize measures the field, so a hidden textarea gets the wrong height. Call `update()` once it becomes visible:
+Autosize measures the field, so a hidden textarea is skipped. Call `update()` once it becomes visible, or after you set its value from code:
 
 ```js
 tabler.Autosize.getOrCreateInstance(document.getElementById('message')).update();
 ```
 
-Call `dispose()` to stop the plugin and remove the component from the element:
+Call `dispose()` to stop it and put the inline style back the way it was:
 
 ```js
 tabler.Autosize.getInstance(document.getElementById('message'))?.dispose();
@@ -58,12 +62,20 @@ tabler.Autosize.getInstance(document.getElementById('message'))?.dispose();
 | Method | Description |
 | --- | --- |
 | `update()` | Recalculates the height, for example after the textarea becomes visible or its value changes from code. |
-| `dispose()` | Stops the plugin and removes the component from the element. |
+| `dispose()` | Stops listening, restores the inline style and removes the component from the element. |
 | `getInstance(element)` | Static. Returns the component for the element, or `null`. |
 | `getOrCreateInstance(element)` | Static. Returns the component for the element and creates it when needed. |
 
+Every change of height fires `resized.bs.autosize` on the textarea, for example to scroll a chat window to the bottom:
+
+```js
+document.getElementById('message').addEventListener('resized.bs.autosize', () => {
+  thread.scrollTop = thread.scrollHeight;
+});
+```
+
 ## Accessibility
 
 - Keep the `label` for the field. A growing textarea is still a normal form control and needs its name.
-- Let the field grow instead of setting a fixed `max-height`. Cutting the growth off brings back the scrolling box the plugin is meant to remove.
-- Do not remove the resize handle unless the field really grows on its own - without either one, a user cannot see long text.
+- Let the field grow freely when you can. A `max-height` brings back a scrolling box, so keep it generous, for example the height of the visible chat window.
+- Autosize hides the resize handle, because the field grows on its own. With a `max-height` the field scrolls past the cap, so long text stays reachable.

pnpm-lock.yaml

@@ -132,9 +132,6 @@ importers:
       apexcharts:
         specifier: 7.0.0
         version: 7.0.0
-      autosize:
-        specifier: ^6.0.1
-        version: 6.0.1
       choices.js:
         specifier: ^11.2.4
         version: 11.2.4
@@ -2095,9 +2092,6 @@ packages:
     peerDependencies:
       postcss: ^8.1.0
 
-  autosize@6.0.1:
-    resolution: {integrity: sha512-f86EjiUKE6Xvczc4ioP1JBlWG7FKrE13qe/DxBCpe8GCipCq2nFw73aO8QEBKHfSbYGDN5eB9jXWKen7tspDqQ==}
-
   axios@0.33.0:
     resolution: {integrity: sha512-juz19g7B3UWT9r3+tgRFQf2Bdy6IKDVroiyuVOUrkILVKHpqHL++K1l8ybvfdEP9B/VE72vk8vllbnedVCm/og==}
 
@@ -6651,8 +6645,6 @@ snapshots:
       postcss: 8.5.28
       postcss-value-parser: 4.2.0
 
-  autosize@6.0.1: {}
-
   axios@0.33.0(debug@4.4.3(supports-color@10.2.2)):
     dependencies:
       follow-redirects: 1.16.0(debug@4.4.3(supports-color@10.2.2))
@@ -9615,7 +9607,7 @@ snapshots:
   vite@8.2.2(@types/node@26.4.0)(esbuild@0.28.1)(sass@1.103.1)(terser@5.51.2)(tsx@4.23.13)(yaml@2.9.0):
     dependencies:
       lightningcss: 1.33.0
-      picomatch: 4.0.5
+      picomatch: 4.0.7
       postcss: 8.5.28
       rolldown: 1.2.6
       tinyglobby: 0.2.17

shared/data/open-source.json

@@ -11,12 +11,6 @@
     "description": "Vanilla JavaScript input masking library with support for various mask types and dynamic behavior.",
     "license": "MIT"
   },
-  {
-    "name": "Autosize",
-    "url": "https://www.jacklmoore.com/autosize/",
-    "description": "Automatically adjusts textarea height to fit text content.",
-    "license": "MIT"
-  },
   {
     "name": "ApexCharts",
     "url": "https://apexcharts.com/",