feat: add Svelte v5-next support (#321)

* fix: remove DOM elements even if component creation fails Fixes #190 * feat: add Svelte v5-next support
testing-library · Feb 13, 2024 · 178b2de · 178b2de
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diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
@@ -16,11 +16,23 @@ jobs:
     if: ${{ !contains(github.head_ref, 'all-contributors') }}
     name: Node ${{ matrix.node }}, Svelte ${{ matrix.svelte }}, ${{ matrix.test-runner }}
     runs-on: ubuntu-latest
+    continue-on-error: ${{ matrix.experimental }}
     strategy:
+      fail-fast: false
       matrix:
         node: ['16', '18', '20']
         svelte: ['3', '4']
         test-runner: ['vitest:jsdom', 'vitest:happy-dom']
+        experimental: [false]
+        include:
+          - node: '20'
+            svelte: 'next'
+            test-runner: 'vitest:jsdom'
+            experimental: true
+          - node: '20'
+            svelte: 'next'
+            test-runner: 'vitest:happy-dom'
+            experimental: true
 
     steps:
       - name: ⬇️ Checkout repo

diff --git a/package.json b/package.json
@@ -64,13 +64,13 @@
     "contributors:generate": "all-contributors generate"
   },
   "peerDependencies": {
-    "svelte": "^3 || ^4"
+    "svelte": "^3 || ^4 || ^5"
   },
   "dependencies": {
     "@testing-library/dom": "^9.3.1"
   },
   "devDependencies": {
-    "@sveltejs/vite-plugin-svelte": "^2.4.2",
+    "@sveltejs/vite-plugin-svelte": "^3.0.2",
     "@testing-library/jest-dom": "^6.3.0",
     "@testing-library/user-event": "^14.5.2",
     "@typescript-eslint/eslint-plugin": "6.19.1",
@@ -94,11 +94,11 @@
     "npm-run-all": "^4.1.5",
     "prettier": "3.2.4",
     "prettier-plugin-svelte": "3.1.2",
-    "svelte": "^3 || ^4",
+    "svelte": "^4.2.10",
     "svelte-check": "^3.6.3",
     "svelte-jester": "^3.0.0",
     "typescript": "^5.3.3",
-    "vite": "^4.3.9",
+    "vite": "^5.1.1",
     "vitest": "^0.33.0"
   }
 }
diff --git a/src/__tests__/__snapshots__/render.test.js.snap b/src/__tests__/__snapshots__/render.test.js.snap
@@ -1,6 +1,6 @@
 // Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html
 
-exports[`render > should accept svelte component options 1`] = `
+exports[`render > should accept svelte v4 component options 1`] = `
 <body>
   <div>
     <h1
@@ -18,8 +18,31 @@ exports[`render > should accept svelte component options 1`] = `
     <button>
       Button
     </button>
-    <!--&lt;Comp&gt;-->
     <div />
   </div>
 </body>
 `;
+
+exports[`render > should accept svelte v5 component options 1`] = `
+<body>
+  
+  
+  
+  <section>
+    <h1
+      data-testid="test"
+    >
+      Hello World!
+    </h1>
+     
+    <div>
+      we have context
+    </div>
+     
+    <button>
+      Button
+    </button>
+    
+  </section>
+</body>
+`;
diff --git a/src/__tests__/cleanup.test.js b/src/__tests__/cleanup.test.js
@@ -0,0 +1,35 @@
+import { describe, expect, test, vi } from 'vitest'
+
+import { act, cleanup, render } from '..'
+import Mounter from './fixtures/Mounter.svelte'
+
+const onExecuted = vi.fn()
+const onDestroyed = vi.fn()
+const renderSubject = () => render(Mounter, { onExecuted, onDestroyed })
+
+describe('cleanup', () => {
+  test('cleanup deletes element', async () => {
+    renderSubject()
+    cleanup()
+
+    expect(document.body).toBeEmptyDOMElement()
+  })
+
+  test('cleanup unmounts component', async () => {
+    await act(renderSubject)
+    cleanup()
+
+    expect(onDestroyed).toHaveBeenCalledOnce()
+  })
+
+  test('cleanup handles unexpected errors during mount', () => {
+    onExecuted.mockImplementation(() => {
+      throw new Error('oh no!')
+    })
+
+    expect(renderSubject).toThrowError()
+    cleanup()
+
+    expect(document.body).toBeEmptyDOMElement()
+  })
+})
diff --git a/src/__tests__/fixtures/Mounter.svelte b/src/__tests__/fixtures/Mounter.svelte
@@ -1,11 +1,19 @@
 <script>
-  import { onDestroy,onMount } from 'svelte'
+  import { onDestroy, onMount } from 'svelte'
 
-  export let onMounted
-  export let onDestroyed
+  export let onExecuted = undefined
+  export let onMounted = undefined
+  export let onDestroyed = undefined
 
-  onMount(() => onMounted())
-  onDestroy(() => onDestroyed())
+  onExecuted?.()
+
+  onMount(() => {
+    onMounted?.()
+  })
+
+  onDestroy(() => {
+    onDestroyed?.()
+  })
 </script>
 
 <button />
diff --git a/src/__tests__/fixtures/Rerender.svelte b/src/__tests__/fixtures/Rerender.svelte
@@ -1,15 +1,17 @@
 <script>
-  import { getContext, onMount } from 'svelte'
+  import { onDestroy, onMount } from 'svelte'
 
-  export let name
+  export let onExecuted = undefined
+  export let onMounted = undefined
+  export let onDestroyed = undefined
 
-  const mountCounter = getContext('mountCounter')
+  export let name = ''
 
-  onMount(() => {
-    mountCounter.update((i) => i + 1)
-  })
-</script>
+  onExecuted?.()
+
+  onMount(() => onMounted?.())
 
-<h1 data-testid="test">Hello {name}!</h1>
+  onDestroy(() => onDestroyed?.())
+</script>
 
-<div data-testid="mount-counter">{$mountCounter}</div>
+<div data-testid="test">Hello {name}!</div>
diff --git a/src/__tests__/mount.test.js b/src/__tests__/mount.test.js
@@ -3,31 +3,31 @@ import { describe, expect, test, vi } from 'vitest'
 import { act, render, screen } from '..'
 import Mounter from './fixtures/Mounter.svelte'
 
-describe('mount and destroy', () => {
-  const handleMount = vi.fn()
-  const handleDestroy = vi.fn()
+const onMounted = vi.fn()
+const onDestroyed = vi.fn()
+const renderSubject = () => render(Mounter, { onMounted, onDestroyed })
 
+describe('mount and destroy', () => {
   test('component is mounted', async () => {
-    await act(() => {
-      render(Mounter, { onMounted: handleMount, onDestroyed: handleDestroy })
-    })
+    renderSubject()
 
     const content = screen.getByRole('button')
 
-    expect(handleMount).toHaveBeenCalledOnce()
     expect(content).toBeInTheDocument()
+    await act()
+    expect(onMounted).toHaveBeenCalledOnce()
   })
 
   test('component is destroyed', async () => {
-    const { unmount } = render(Mounter, {
-      onMounted: handleMount,
-      onDestroyed: handleDestroy,
-    })
+    const { unmount } = renderSubject()
+
+    await act()
+    unmount()
 
-    await act(() => unmount())
     const content = screen.queryByRole('button')
 
-    expect(handleDestroy).toHaveBeenCalledOnce()
     expect(content).not.toBeInTheDocument()
+    await act()
+    expect(onDestroyed).toHaveBeenCalledOnce()
   })
 })
diff --git a/src/__tests__/render.test.js b/src/__tests__/render.test.js
@@ -1,3 +1,4 @@
+import { VERSION as SVELTE_VERSION } from 'svelte/compiler'
 import { beforeEach, describe, expect, test } from 'vitest'
 
 import { act, render as stlRender } from '..'
@@ -11,13 +12,13 @@ describe('render', () => {
     return stlRender(Comp, {
       target: document.body,
       props,
-      ...additional
+      ...additional,
     })
   }
 
   beforeEach(() => {
     props = {
-      name: 'World'
+      name: 'World',
     }
   })
 
@@ -41,7 +42,9 @@ describe('render', () => {
   })
 
   test('change props with accessors', async () => {
-    const { component, getByText } = render({ accessors: true })
+    const { component, getByText } = render(
+      SVELTE_VERSION < '5' ? { accessors: true } : {}
+    )
 
     expect(getByText('Hello World!')).toBeInTheDocument()
 
@@ -59,23 +62,41 @@ describe('render', () => {
     expect(getByText('Hello World!')).toBeInTheDocument()
   })
 
-  test('should accept svelte component options', () => {
-    const target = document.createElement('div')
-    const div = document.createElement('div')
-    document.body.appendChild(target)
-    target.appendChild(div)
-    const { container } = stlRender(Comp, {
-      target,
-      anchor: div,
-      props: { name: 'World' },
-      context: new Map([['name', 'context']])
-    })
-    expect(container).toMatchSnapshot()
-  })
+  test.runIf(SVELTE_VERSION < '5')(
+    'should accept svelte v4 component options',
+    () => {
+      const target = document.createElement('div')
+      const div = document.createElement('div')
+      document.body.appendChild(target)
+      target.appendChild(div)
+      const { container } = stlRender(Comp, {
+        target,
+        anchor: div,
+        props: { name: 'World' },
+        context: new Map([['name', 'context']]),
+      })
+      expect(container).toMatchSnapshot()
+    }
+  )
+
+  test.runIf(SVELTE_VERSION >= '5')(
+    'should accept svelte v5 component options',
+    () => {
+      const target = document.createElement('section')
+      document.body.appendChild(target)
+
+      const { container } = stlRender(Comp, {
+        target,
+        props: { name: 'World' },
+        context: new Map([['name', 'context']]),
+      })
+      expect(container).toMatchSnapshot()
+    }
+  )
 
   test('should throw error when mixing svelte component options and props', () => {
     expect(() => {
-      stlRender(Comp, { anchor: '', name: 'World' })
+      stlRender(Comp, { props: {}, name: 'World' })
     }).toThrow(/Unknown options were found/)
   })
 
@@ -93,10 +114,8 @@ describe('render', () => {
 
   test("accept the 'context' option", () => {
     const { getByText } = stlRender(Comp, {
-      props: {
-        name: 'Universe'
-      },
-      context: new Map([['name', 'context']])
+      props: { name: 'Universe' },
+      context: new Map([['name', 'context']]),
     })
 
     expect(getByText('we have context')).toBeInTheDocument()

diff --git a/src/__tests__/rerender.test.js b/src/__tests__/rerender.test.js
@@ -1,24 +1,24 @@
 /**
  * @jest-environment jsdom
  */
-import { expect, test, vi } from 'vitest'
+import { describe, expect, test, vi } from 'vitest'
 import { writable } from 'svelte/store'
 
-import { render, waitFor } from '..'
+import { act, render, waitFor } from '..'
 import Comp from './fixtures/Rerender.svelte'
 
-const mountCounter = writable(0)
-
 test('mounts new component successfully', async () => {
+  const onMounted = vi.fn()
+  const onDestroyed = vi.fn()
+
   const { getByTestId, rerender } = render(Comp, {
-    props: { name: 'World 1' },
-    context: new Map(Object.entries({ mountCounter })),
+    props: { name: 'World 1', onMounted, onDestroyed },
   })
 
   const expectToRender = (content) =>
     waitFor(() => {
       expect(getByTestId('test')).toHaveTextContent(content)
-      expect(getByTestId('mount-counter')).toHaveTextContent('1')
+      expect(onMounted).toHaveBeenCalledOnce()
     })
 
   await expectToRender('Hello World 1!')
@@ -27,12 +27,15 @@ test('mounts new component successfully', async () => {
 
   rerender({ props: { name: 'World 2' } })
   await expectToRender('Hello World 2!')
+  expect(onDestroyed).not.toHaveBeenCalled()
 
-  expect(console.warn).toHaveBeenCalled()
+  expect(console.warn).toHaveBeenCalledOnce()
 
   console.warn.mockClear()
+  onDestroyed.mockReset()
   rerender({ name: 'World 3' })
   await expectToRender('Hello World 3!')
+  expect(onDestroyed).not.toHaveBeenCalled()
 
   expect(console.warn).not.toHaveBeenCalled()
 })
diff --git a/src/__tests__/transition.test.js b/src/__tests__/transition.test.js
@@ -1,10 +1,11 @@
 import { userEvent } from '@testing-library/user-event'
+import { VERSION as SVELTE_VERSION } from 'svelte/compiler'
 import { beforeEach, describe, expect, test, vi } from 'vitest'
 
 import { render, screen, waitFor } from '..'
 import Transitioner from './fixtures/Transitioner.svelte'
 
-describe('transitions', () => {
+describe.runIf(SVELTE_VERSION < '5')('transitions', () => {
   beforeEach(() => {
     if (window.navigator.userAgent.includes('jsdom')) {
       const raf = (fn) => setTimeout(() => fn(new Date()), 16)