From b2005b75128c3d45dad96b860558ac21cf85bf66 Mon Sep 17 00:00:00 2001
From: Michael Cousins <michael@cousins.io>
Date: Wed, 7 May 2025 11:35:21 -0400
Subject: [PATCH 1/5] test: replace deprecated `toMatchTypeOf` (#434)

---
 package.json                             |  1 +
 src/__tests__/render-runes.test-d.ts     |  4 ++--
 src/__tests__/render-utilities.test-d.ts | 14 +++++++-------
 src/__tests__/render.test-d.ts           |  2 +-
 tsconfig.json                            |  3 ++-
 5 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/package.json b/package.json
index 77bba08..8bab118 100644
--- a/package.json
+++ b/package.json
@@ -127,6 +127,7 @@
     "svelte-check": "^3.0.0 || ^4.0.4",
     "svelte-jester": "^5.0.0",
     "typescript": "^5.5.3",
+    "typescript-svelte-plugin": "^0.3.46",
     "vite": "^4.0.0 || ^5.3.3",
     "vitest": "0.x.x || ^1.0.0 || ^2.0.2"
   }
diff --git a/src/__tests__/render-runes.test-d.ts b/src/__tests__/render-runes.test-d.ts
index 48d9d27..51b7cfa 100644
--- a/src/__tests__/render-runes.test-d.ts
+++ b/src/__tests__/render-runes.test-d.ts
@@ -29,7 +29,7 @@ describe('types', () => {
   test('render result has container and component', () => {
     const result = subject.render(Component, { name: 'Alice', count: 42 })
 
-    expectTypeOf(result).toMatchTypeOf<{
+    expectTypeOf(result).toExtend<{
       container: HTMLElement
       component: { hello: string }
       debug: (el?: HTMLElement) => void
@@ -55,7 +55,7 @@ describe('legacy component types', () => {
       count: 42,
     })
 
-    expectTypeOf(component).toMatchTypeOf<{ hello: string }>()
+    expectTypeOf(component).toExtend<{ hello: string }>()
 
     // @ts-expect-error: Svelte 5 mount does not return `$set`
     component.$on('greeting', onGreeting)
diff --git a/src/__tests__/render-utilities.test-d.ts b/src/__tests__/render-utilities.test-d.ts
index b45614e..d1e3869 100644
--- a/src/__tests__/render-utilities.test-d.ts
+++ b/src/__tests__/render-utilities.test-d.ts
@@ -8,7 +8,7 @@ describe('render query and utility types', () => {
   test('render result has default queries', () => {
     const result = subject.render(Component, { name: 'Alice' })
 
-    expectTypeOf(result.getByRole).parameters.toMatchTypeOf<
+    expectTypeOf(result.getByRole).parameters.toExtend<
       [role: subject.ByRoleMatcher, options?: subject.ByRoleOptions]
     >()
   })
@@ -27,25 +27,25 @@ describe('render query and utility types', () => {
       { queries: { getByVibes } }
     )
 
-    expectTypeOf(result.getByVibes).parameters.toMatchTypeOf<[vibes: string]>()
+    expectTypeOf(result.getByVibes).parameters.toExtend<[vibes: string]>()
   })
 
   test('act is an async function', () => {
-    expectTypeOf(subject.act).toMatchTypeOf<() => Promise<void>>()
+    expectTypeOf(subject.act).toExtend<() => Promise<void>>()
   })
 
   test('act accepts a sync function', () => {
-    expectTypeOf(subject.act).toMatchTypeOf<(fn: () => void) => Promise<void>>()
+    expectTypeOf(subject.act).toExtend<(fn: () => void) => Promise<void>>()
   })
 
   test('act accepts an async function', () => {
-    expectTypeOf(subject.act).toMatchTypeOf<
+    expectTypeOf(subject.act).toExtend<
       (fn: () => Promise<void>) => Promise<void>
     >()
   })
 
   test('fireEvent is an async function', () => {
-    expectTypeOf(subject.fireEvent).toMatchTypeOf<
+    expectTypeOf(subject.fireEvent).toExtend<
       (
         element: Element | Node | Document | Window,
         event: Event
@@ -54,7 +54,7 @@ describe('render query and utility types', () => {
   })
 
   test('fireEvent[eventName] is an async function', () => {
-    expectTypeOf(subject.fireEvent.click).toMatchTypeOf<
+    expectTypeOf(subject.fireEvent.click).toExtend<
       (
         element: Element | Node | Document | Window,
         // eslint-disable-next-line @typescript-eslint/no-empty-object-type
diff --git a/src/__tests__/render.test-d.ts b/src/__tests__/render.test-d.ts
index 08cad70..bf0a611 100644
--- a/src/__tests__/render.test-d.ts
+++ b/src/__tests__/render.test-d.ts
@@ -37,7 +37,7 @@ describe('types', () => {
   test('render result has container and component', () => {
     const result = subject.render(Component, { name: 'Alice', count: 42 })
 
-    expectTypeOf(result).toMatchTypeOf<{
+    expectTypeOf(result).toExtend<{
       container: HTMLElement
       component: { hello: string }
       debug: (el?: HTMLElement) => void
diff --git a/tsconfig.json b/tsconfig.json
index f79cace..0cc0fdf 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -5,7 +5,8 @@
     "noEmit": true,
     "skipLibCheck": true,
     "strict": true,
-    "types": ["svelte", "vite/client", "vitest", "vitest/globals"]
+    "types": ["svelte", "vite/client", "vitest", "vitest/globals"],
+    "plugins": [{ "name": "typescript-svelte-plugin" }]
   },
   "include": ["src"]
 }

From ea37c470b02233baca598834143c3ac27f669b9d Mon Sep 17 00:00:00 2001
From: Michael Cousins <michael@cousins.io>
Date: Wed, 7 May 2025 12:17:32 -0400
Subject: [PATCH 2/5] test: extract `tests` directory out of `src` (#433)

---
 jest.config.js                                        | 8 ++++----
 package.json                                          | 3 +--
 src/__tests__/utils.js => tests/_env.js               | 0
 {src/__tests__ => tests}/_jest-setup.js               | 0
 {src/__tests__ => tests}/_jest-vitest-alias.js        | 0
 {src/__tests__ => tests}/_vitest-setup.js             | 0
 {src/__tests__ => tests}/act.test.js                  | 0
 {src/__tests__ => tests}/auto-cleanup.test.js         | 6 +++---
 {src/__tests__ => tests}/cleanup.test.js              | 0
 {src/__tests__ => tests}/context.test.js              | 0
 {src/__tests__ => tests}/debug.test.js                | 0
 {src/__tests__ => tests}/events.test.js               | 0
 {src/__tests__ => tests}/fixtures/Comp.svelte         | 0
 {src/__tests__ => tests}/fixtures/CompRunes.svelte    | 0
 {src/__tests__ => tests}/fixtures/Context.svelte      | 0
 {src/__tests__ => tests}/fixtures/Mounter.svelte      | 0
 {src/__tests__ => tests}/fixtures/Transitioner.svelte | 0
 {src/__tests__ => tests}/fixtures/Typed.svelte        | 0
 {src/__tests__ => tests}/fixtures/TypedRunes.svelte   | 0
 {src/__tests__ => tests}/mount.test.js                | 0
 {src/__tests__ => tests}/multi-base.test.js           | 0
 {src/__tests__ => tests}/render-runes.test-d.ts       | 2 +-
 {src/__tests__ => tests}/render-utilities.test-d.ts   | 2 +-
 {src/__tests__ => tests}/render.test-d.ts             | 2 +-
 {src/__tests__ => tests}/render.test.js               | 2 +-
 {src/__tests__ => tests}/rerender.test.js             | 2 +-
 {src/__tests__ => tests}/transition.test.js           | 2 +-
 {src/__tests__ => tests}/vite-plugin.test.js          | 4 ++--
 tsconfig.build.json                                   | 2 +-
 tsconfig.json                                         | 6 +++++-
 tsconfig.legacy.json                                  | 6 +++---
 vite.config.js                                        | 9 ++++-----
 32 files changed, 29 insertions(+), 27 deletions(-)
 rename src/__tests__/utils.js => tests/_env.js (100%)
 rename {src/__tests__ => tests}/_jest-setup.js (100%)
 rename {src/__tests__ => tests}/_jest-vitest-alias.js (100%)
 rename {src/__tests__ => tests}/_vitest-setup.js (100%)
 rename {src/__tests__ => tests}/act.test.js (100%)
 rename {src/__tests__ => tests}/auto-cleanup.test.js (89%)
 rename {src/__tests__ => tests}/cleanup.test.js (100%)
 rename {src/__tests__ => tests}/context.test.js (100%)
 rename {src/__tests__ => tests}/debug.test.js (100%)
 rename {src/__tests__ => tests}/events.test.js (100%)
 rename {src/__tests__ => tests}/fixtures/Comp.svelte (100%)
 rename {src/__tests__ => tests}/fixtures/CompRunes.svelte (100%)
 rename {src/__tests__ => tests}/fixtures/Context.svelte (100%)
 rename {src/__tests__ => tests}/fixtures/Mounter.svelte (100%)
 rename {src/__tests__ => tests}/fixtures/Transitioner.svelte (100%)
 rename {src/__tests__ => tests}/fixtures/Typed.svelte (100%)
 rename {src/__tests__ => tests}/fixtures/TypedRunes.svelte (100%)
 rename {src/__tests__ => tests}/mount.test.js (100%)
 rename {src/__tests__ => tests}/multi-base.test.js (100%)
 rename {src/__tests__ => tests}/render-runes.test-d.ts (97%)
 rename {src/__tests__ => tests}/render-utilities.test-d.ts (97%)
 rename {src/__tests__ => tests}/render.test-d.ts (97%)
 rename {src/__tests__ => tests}/render.test.js (98%)
 rename {src/__tests__ => tests}/rerender.test.js (95%)
 rename {src/__tests__ => tests}/transition.test.js (94%)
 rename {src/__tests__ => tests}/vite-plugin.test.js (98%)

diff --git a/jest.config.js b/jest.config.js
index 4857b64..ff518c4 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -4,23 +4,23 @@ const SVELTE_TRANSFORM_PATTERN =
   SVELTE_VERSION >= '5' ? '^.+\\.svelte(?:\\.js)?$' : '^.+\\.svelte$'
 
 export default {
-  testMatch: ['<rootDir>/src/__tests__/**/*.test.js'],
+  testMatch: ['<rootDir>/tests/**/*.test.js'],
   transform: {
     [SVELTE_TRANSFORM_PATTERN]: 'svelte-jester',
   },
   moduleFileExtensions: ['js', 'svelte'],
   extensionsToTreatAsEsm: ['.svelte'],
   testEnvironment: 'jsdom',
-  setupFilesAfterEnv: ['<rootDir>/src/__tests__/_jest-setup.js'],
+  setupFilesAfterEnv: ['<rootDir>/tests/_jest-setup.js'],
   injectGlobals: false,
   moduleNameMapper: {
-    '^vitest$': '<rootDir>/src/__tests__/_jest-vitest-alias.js',
+    '^vitest$': '<rootDir>/tests/_jest-vitest-alias.js',
+    '^@testing-library\\/svelte$': '<rootDir>/src/index.js',
   },
   resetMocks: true,
   restoreMocks: true,
   collectCoverageFrom: ['<rootDir>/src/**/*'],
   coveragePathIgnorePatterns: [
-    '/__tests__/',
     '<rootDir>/src/vite.js',
     '<rootDir>/src/vitest.js',
   ],
diff --git a/package.json b/package.json
index 8bab118..d686b2c 100644
--- a/package.json
+++ b/package.json
@@ -49,8 +49,7 @@
   ],
   "files": [
     "src",
-    "types",
-    "!__tests__"
+    "types"
   ],
   "scripts": {
     "all": "npm-run-all contributors:generate toc format types build test:vitest:* test:jest",
diff --git a/src/__tests__/utils.js b/tests/_env.js
similarity index 100%
rename from src/__tests__/utils.js
rename to tests/_env.js
diff --git a/src/__tests__/_jest-setup.js b/tests/_jest-setup.js
similarity index 100%
rename from src/__tests__/_jest-setup.js
rename to tests/_jest-setup.js
diff --git a/src/__tests__/_jest-vitest-alias.js b/tests/_jest-vitest-alias.js
similarity index 100%
rename from src/__tests__/_jest-vitest-alias.js
rename to tests/_jest-vitest-alias.js
diff --git a/src/__tests__/_vitest-setup.js b/tests/_vitest-setup.js
similarity index 100%
rename from src/__tests__/_vitest-setup.js
rename to tests/_vitest-setup.js
diff --git a/src/__tests__/act.test.js b/tests/act.test.js
similarity index 100%
rename from src/__tests__/act.test.js
rename to tests/act.test.js
diff --git a/src/__tests__/auto-cleanup.test.js b/tests/auto-cleanup.test.js
similarity index 89%
rename from src/__tests__/auto-cleanup.test.js
rename to tests/auto-cleanup.test.js
index 7962925..d6ba28b 100644
--- a/src/__tests__/auto-cleanup.test.js
+++ b/tests/auto-cleanup.test.js
@@ -1,6 +1,6 @@
 import { afterEach, beforeEach, describe, expect, test, vi } from 'vitest'
 
-import { IS_JEST } from './utils.js'
+import { IS_JEST } from './_env.js'
 
 // TODO(mcous, 2024-12-08): clearing module cache and re-importing
 // in Jest breaks Svelte's environment checking heuristics.
@@ -19,7 +19,7 @@ describe.skipIf(IS_JEST)('auto-cleanup', () => {
   })
 
   test('calls afterEach with cleanup if globally defined', async () => {
-    const { render } = await import('../index.js')
+    const { render } = await import('@testing-library/svelte')
 
     expect(globalAfterEach).toHaveBeenCalledTimes(1)
     expect(globalAfterEach).toHaveBeenLastCalledWith(expect.any(Function))
@@ -35,7 +35,7 @@ describe.skipIf(IS_JEST)('auto-cleanup', () => {
   test('does not call afterEach if process STL_SKIP_AUTO_CLEANUP is set', async () => {
     process.env.STL_SKIP_AUTO_CLEANUP = 'true'
 
-    await import('../index.js')
+    await import('@testing-library/svelte')
 
     expect(globalAfterEach).toHaveBeenCalledTimes(0)
   })
diff --git a/src/__tests__/cleanup.test.js b/tests/cleanup.test.js
similarity index 100%
rename from src/__tests__/cleanup.test.js
rename to tests/cleanup.test.js
diff --git a/src/__tests__/context.test.js b/tests/context.test.js
similarity index 100%
rename from src/__tests__/context.test.js
rename to tests/context.test.js
diff --git a/src/__tests__/debug.test.js b/tests/debug.test.js
similarity index 100%
rename from src/__tests__/debug.test.js
rename to tests/debug.test.js
diff --git a/src/__tests__/events.test.js b/tests/events.test.js
similarity index 100%
rename from src/__tests__/events.test.js
rename to tests/events.test.js
diff --git a/src/__tests__/fixtures/Comp.svelte b/tests/fixtures/Comp.svelte
similarity index 100%
rename from src/__tests__/fixtures/Comp.svelte
rename to tests/fixtures/Comp.svelte
diff --git a/src/__tests__/fixtures/CompRunes.svelte b/tests/fixtures/CompRunes.svelte
similarity index 100%
rename from src/__tests__/fixtures/CompRunes.svelte
rename to tests/fixtures/CompRunes.svelte
diff --git a/src/__tests__/fixtures/Context.svelte b/tests/fixtures/Context.svelte
similarity index 100%
rename from src/__tests__/fixtures/Context.svelte
rename to tests/fixtures/Context.svelte
diff --git a/src/__tests__/fixtures/Mounter.svelte b/tests/fixtures/Mounter.svelte
similarity index 100%
rename from src/__tests__/fixtures/Mounter.svelte
rename to tests/fixtures/Mounter.svelte
diff --git a/src/__tests__/fixtures/Transitioner.svelte b/tests/fixtures/Transitioner.svelte
similarity index 100%
rename from src/__tests__/fixtures/Transitioner.svelte
rename to tests/fixtures/Transitioner.svelte
diff --git a/src/__tests__/fixtures/Typed.svelte b/tests/fixtures/Typed.svelte
similarity index 100%
rename from src/__tests__/fixtures/Typed.svelte
rename to tests/fixtures/Typed.svelte
diff --git a/src/__tests__/fixtures/TypedRunes.svelte b/tests/fixtures/TypedRunes.svelte
similarity index 100%
rename from src/__tests__/fixtures/TypedRunes.svelte
rename to tests/fixtures/TypedRunes.svelte
diff --git a/src/__tests__/mount.test.js b/tests/mount.test.js
similarity index 100%
rename from src/__tests__/mount.test.js
rename to tests/mount.test.js
diff --git a/src/__tests__/multi-base.test.js b/tests/multi-base.test.js
similarity index 100%
rename from src/__tests__/multi-base.test.js
rename to tests/multi-base.test.js
diff --git a/src/__tests__/render-runes.test-d.ts b/tests/render-runes.test-d.ts
similarity index 97%
rename from src/__tests__/render-runes.test-d.ts
rename to tests/render-runes.test-d.ts
index 51b7cfa..1e42544 100644
--- a/src/__tests__/render-runes.test-d.ts
+++ b/tests/render-runes.test-d.ts
@@ -1,7 +1,7 @@
+import * as subject from '@testing-library/svelte'
 import { expectTypeOf } from 'expect-type'
 import { describe, test, vi } from 'vitest'
 
-import * as subject from '../index.js'
 import LegacyComponent from './fixtures/Typed.svelte'
 import Component from './fixtures/TypedRunes.svelte'
 
diff --git a/src/__tests__/render-utilities.test-d.ts b/tests/render-utilities.test-d.ts
similarity index 97%
rename from src/__tests__/render-utilities.test-d.ts
rename to tests/render-utilities.test-d.ts
index d1e3869..c72f761 100644
--- a/src/__tests__/render-utilities.test-d.ts
+++ b/tests/render-utilities.test-d.ts
@@ -1,7 +1,7 @@
+import * as subject from '@testing-library/svelte'
 import { expectTypeOf } from 'expect-type'
 import { describe, test } from 'vitest'
 
-import * as subject from '../index.js'
 import Component from './fixtures/Comp.svelte'
 
 describe('render query and utility types', () => {
diff --git a/src/__tests__/render.test-d.ts b/tests/render.test-d.ts
similarity index 97%
rename from src/__tests__/render.test-d.ts
rename to tests/render.test-d.ts
index bf0a611..eb1c639 100644
--- a/src/__tests__/render.test-d.ts
+++ b/tests/render.test-d.ts
@@ -1,8 +1,8 @@
+import * as subject from '@testing-library/svelte'
 import { expectTypeOf } from 'expect-type'
 import { ComponentProps } from 'svelte'
 import { describe, test } from 'vitest'
 
-import * as subject from '../index.js'
 import Component from './fixtures/Typed.svelte'
 
 describe('types', () => {
diff --git a/src/__tests__/render.test.js b/tests/render.test.js
similarity index 98%
rename from src/__tests__/render.test.js
rename to tests/render.test.js
index f396751..943c920 100644
--- a/src/__tests__/render.test.js
+++ b/tests/render.test.js
@@ -1,7 +1,7 @@
 import { render } from '@testing-library/svelte'
 import { beforeAll, describe, expect, test } from 'vitest'
 
-import { COMPONENT_FIXTURES } from './utils.js'
+import { COMPONENT_FIXTURES } from './_env.js'
 
 describe.each(COMPONENT_FIXTURES)('render ($mode)', ({ component }) => {
   const props = { name: 'World' }
diff --git a/src/__tests__/rerender.test.js b/tests/rerender.test.js
similarity index 95%
rename from src/__tests__/rerender.test.js
rename to tests/rerender.test.js
index 52acd0f..2a20143 100644
--- a/src/__tests__/rerender.test.js
+++ b/tests/rerender.test.js
@@ -1,7 +1,7 @@
 import { act, render, screen } from '@testing-library/svelte'
 import { beforeAll, describe, expect, test, vi } from 'vitest'
 
-import { COMPONENT_FIXTURES, IS_SVELTE_5, MODE_RUNES } from './utils.js'
+import { COMPONENT_FIXTURES, IS_SVELTE_5, MODE_RUNES } from './_env.js'
 
 describe.each(COMPONENT_FIXTURES)('rerender ($mode)', ({ mode, component }) => {
   let Comp
diff --git a/src/__tests__/transition.test.js b/tests/transition.test.js
similarity index 94%
rename from src/__tests__/transition.test.js
rename to tests/transition.test.js
index a9c8e02..3acf1d0 100644
--- a/src/__tests__/transition.test.js
+++ b/tests/transition.test.js
@@ -2,8 +2,8 @@ import { render, screen, waitFor } from '@testing-library/svelte'
 import { userEvent } from '@testing-library/user-event'
 import { beforeEach, describe, expect, test, vi } from 'vitest'
 
+import { IS_JSDOM, IS_SVELTE_5 } from './_env.js'
 import Transitioner from './fixtures/Transitioner.svelte'
-import { IS_JSDOM, IS_SVELTE_5 } from './utils.js'
 
 describe.skipIf(IS_SVELTE_5)('transitions', () => {
   beforeEach(() => {
diff --git a/src/__tests__/vite-plugin.test.js b/tests/vite-plugin.test.js
similarity index 98%
rename from src/__tests__/vite-plugin.test.js
rename to tests/vite-plugin.test.js
index 9232f65..92fc8f5 100644
--- a/src/__tests__/vite-plugin.test.js
+++ b/tests/vite-plugin.test.js
@@ -1,7 +1,7 @@
+import { svelteTesting } from '@testing-library/svelte/vite'
 import { beforeEach, describe, expect, test, vi } from 'vitest'
 
-import { svelteTesting } from '../vite.js'
-import { IS_JEST } from './utils.js'
+import { IS_JEST } from './_env.js'
 
 describe.skipIf(IS_JEST)('vite plugin', () => {
   beforeEach(() => {
diff --git a/tsconfig.build.json b/tsconfig.build.json
index 0baa218..bfc566b 100644
--- a/tsconfig.build.json
+++ b/tsconfig.build.json
@@ -8,5 +8,5 @@
     "rootDir": "src",
     "outDir": "types"
   },
-  "exclude": ["src/**/__tests__/**"]
+  "include": ["src"]
 }
diff --git a/tsconfig.json b/tsconfig.json
index 0cc0fdf..fda8aba 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -6,7 +6,11 @@
     "skipLibCheck": true,
     "strict": true,
     "types": ["svelte", "vite/client", "vitest", "vitest/globals"],
+    "baseUrl": "./",
+    "paths": {
+      "@testing-library/svelte": ["./src"]
+    },
     "plugins": [{ "name": "typescript-svelte-plugin" }]
   },
-  "include": ["src"]
+  "include": ["src", "tests"]
 }
diff --git a/tsconfig.legacy.json b/tsconfig.legacy.json
index b5d9e57..304d872 100644
--- a/tsconfig.legacy.json
+++ b/tsconfig.legacy.json
@@ -1,8 +1,8 @@
 {
   "extends": ["./tsconfig.json"],
   "exclude": [
-    "src/__tests__/render-runes.test-d.ts",
-    "src/__tests__/fixtures/CompRunes.svelte",
-    "src/__tests__/fixtures/TypedRunes.svelte"
+    "tests/render-runes.test-d.ts",
+    "tests/fixtures/CompRunes.svelte",
+    "tests/fixtures/TypedRunes.svelte"
   ]
 }
diff --git a/vite.config.js b/vite.config.js
index 2db8a40..75bd66a 100644
--- a/vite.config.js
+++ b/vite.config.js
@@ -1,10 +1,9 @@
 import { createRequire } from 'node:module'
 
 import { svelte } from '@sveltejs/vite-plugin-svelte'
+import { svelteTesting } from '@testing-library/svelte/vite'
 import { defineConfig } from 'vite'
 
-import { svelteTesting } from './src/vite.js'
-
 const require = createRequire(import.meta.url)
 
 // https://vitejs.dev/config/
@@ -12,17 +11,17 @@ export default defineConfig({
   plugins: [svelte(), svelteTesting()],
   test: {
     environment: 'jsdom',
-    setupFiles: ['./src/__tests__/_vitest-setup.js'],
+    setupFiles: ['./tests/_vitest-setup.js'],
     mockReset: true,
     unstubGlobals: true,
     unstubEnvs: true,
     coverage: {
       provider: 'v8',
       include: ['src/**/*'],
-      exclude: ['**/__tests__/**', 'src/vite.js', 'src/vitest.js'],
     },
     alias: {
-      '@testing-library/svelte': require.resolve('.'),
+      '@testing-library/svelte/vite': require.resolve('./src/vite.js'),
+      '@testing-library/svelte': require.resolve('./src/index.js'),
     },
   },
 })

From 6096f05e805cf55474f52f303562f4013785d25f Mon Sep 17 00:00:00 2001
From: Michael Cousins <michael@cousins.io>
Date: Wed, 7 May 2025 12:52:03 -0400
Subject: [PATCH 3/5] ci: expand matrix to include Node 22 (#435)

---
 .github/workflows/release.yml | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 79dbe5a..c61b1d6 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -17,7 +17,7 @@ jobs:
   main:
     # ignore all-contributors PRs
     if: ${{ !contains(github.head_ref, 'all-contributors') }}
-    name: Node ${{ matrix.node }}, Svelte ${{ matrix.svelte }}, ${{ matrix.check }}
+    name: Svelte ${{ matrix.svelte }}, Node ${{ matrix.node }}, ${{ matrix.check }}
     runs-on: ubuntu-latest
 
     # enable OIDC for codecov uploads
@@ -27,20 +27,22 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node: ['16', '18', '20']
-        svelte: ['3', '4']
+        node: ['16', '18', '20', '22']
+        svelte: ['3', '4', '5']
         check: ['test:vitest:jsdom', 'test:vitest:happy-dom', 'test:jest']
+        exclude:
+          # Don't run Svelte 3 on Node versions greater than 20
+          - { svelte: '3', node: '22' }
+          # Only run Svelte 5 on Node versions greater than or equal to 20
+          - { svelte: '5', node: '16' }
+          - { svelte: '5', node: '18' }
         include:
           # We only need to lint once, so do it on latest Node and Svelte
-          - { node: '20', svelte: '4', check: 'lint' }
-          # Run type checks in latest node
-          - { node: '20', svelte: '3', check: 'types:legacy' }
-          - { node: '20', svelte: '4', check: 'types:legacy' }
-          - { node: '20', svelte: '5', check: 'types' }
-          # Only run Svelte 5 checks on latest Node
-          - { node: '20', svelte: '5', check: 'test:vitest:jsdom' }
-          - { node: '20', svelte: '5', check: 'test:vitest:happy-dom' }
-          - { node: '20', svelte: '5', check: 'test:jest' }
+          - { svelte: '5', node: '22', check: 'lint' }
+          # Run type checks in latest applicable Node
+          - { svelte: '3', node: '20', check: 'types:legacy' }
+          - { svelte: '4', node: '22', check: 'types:legacy' }
+          - { svelte: '5', node: '22', check: 'types' }
 
     steps:
       - name: ⬇️ Checkout repo

From f1fb8ddd7e1b599244e9359bb71db47268139f64 Mon Sep 17 00:00:00 2001
From: Michael Cousins <michael@cousins.io>
Date: Fri, 9 May 2025 12:11:54 -0400
Subject: [PATCH 4/5] ci: use specific dependencies for different Svelte/Node
 versions (#436)

---
 .github/workflows/release.yml          |  6 ++--
 .npmrc                                 |  1 +
 CONTRIBUTING.md                        | 20 ++++++------
 package.json                           | 41 ++++++++++--------------
 scripts/changed-files                  |  3 --
 scripts/install-dependencies           | 44 ++++++++++++++------------
 src/component-types.d.ts               |  2 +-
 tests/envs/svelte3/node16/package.json | 24 ++++++++++++++
 tests/envs/svelte3/package.json        | 24 ++++++++++++++
 tests/envs/svelte4/node16/package.json | 24 ++++++++++++++
 tests/envs/svelte4/package.json        | 24 ++++++++++++++
 vite.config.js                         |  3 +-
 12 files changed, 153 insertions(+), 63 deletions(-)
 delete mode 100755 scripts/changed-files
 create mode 100644 tests/envs/svelte3/node16/package.json
 create mode 100644 tests/envs/svelte3/package.json
 create mode 100644 tests/envs/svelte4/node16/package.json
 create mode 100644 tests/envs/svelte4/package.json

diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index c61b1d6..be02b70 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -75,10 +75,10 @@ jobs:
       - name: ⎔ Setup node
         uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 22
 
       - name: 📥 Download deps
-        run: npm install --no-package-lock
+        run: npm install
 
       - name: 🏗️ Build types
         run: npm run build
@@ -102,7 +102,7 @@ jobs:
       - name: ⎔ Setup node
         uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 22
 
       - name: 📥 Downloads types build
         uses: actions/download-artifact@v4
diff --git a/.npmrc b/.npmrc
index 43c97e7..86916fa 100644
--- a/.npmrc
+++ b/.npmrc
@@ -1 +1,2 @@
 package-lock=false
+engine-strict=true
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 4c40705..41193a3 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -28,11 +28,10 @@ npm run preview-release
 
 ## Development setup
 
-After cloning the repository, install the project's dependencies and run the `validate` script to run all checks and tests to verify your setup.
+After cloning the repository, use the `setup` script to install dependencies and run all checks:
 
 ```shell
-npm install # or `pnpm install`, or `yarn install`, etc.
-npm run validate
+npm run setup
 ```
 
 ### Lint and format
@@ -40,13 +39,13 @@ npm run validate
 Run auto-formatting to ensure any changes adhere to the code style of the repository:
 
 ```shell
-npm run format:delta
+npm run format
 ```
 
 To run lint and format checks without making any changes:
 
 ```shell
-npm run lint:delta
+npm run lint
 ```
 
 ### Test
@@ -63,18 +62,19 @@ npm run test:watch
 Use the provided script to set up your environment for different versions of Svelte:
 
 ```shell
-# install Svelte 5
+# Svelte 5
 npm run install:5
+npm run all
 
-# install Svelte 4
+# Svelte 4
 npm run install:4
+npm run all:legacy
 
-# install Svelte 3
+# Svelte 3
 npm run install:3
+npm run all:legacy
 ```
 
-Not all checks will pass on `svelte<5`. Reference the CI workflows to see which checks are expected to pass on older versions.
-
 ### Docs
 
 Use the `toc` script to ensure the README's table of contents is up to date:
diff --git a/package.json b/package.json
index d686b2c..7e50de7 100644
--- a/package.json
+++ b/package.json
@@ -53,16 +53,11 @@
   ],
   "scripts": {
     "all": "npm-run-all contributors:generate toc format types build test:vitest:* test:jest",
+    "all:legacy": "npm-run-all types:legacy test:vitest:* test:jest",
     "toc": "doctoc README.md",
     "lint": "prettier . --check && eslint .",
-    "lint:delta": "npm-run-all -p prettier:delta eslint:delta",
-    "prettier:delta": "prettier --check `./scripts/changed-files`",
-    "eslint:delta": "eslint `./scripts/changed-files`",
     "format": "prettier . --write && eslint . --fix",
-    "format:delta": "npm-run-all format:prettier:delta format:eslint:delta",
-    "format:prettier:delta": "prettier --write `./scripts/changed-files`",
-    "format:eslint:delta": "eslint --fix `./scripts/changed-files`",
-    "setup": "npm install && npm run all",
+    "setup": "npm run install:5 && npm run all",
     "test": "vitest run --coverage",
     "test:watch": "vitest",
     "test:vitest:jsdom": "vitest run --coverage --environment jsdom",
@@ -70,7 +65,6 @@
     "test:jest": "npx --node-options=\"--experimental-vm-modules --no-warnings\" jest --coverage",
     "types": "svelte-check",
     "types:legacy": "svelte-check --tsconfig tsconfig.legacy.json",
-    "validate": "npm-run-all test:vitest:* test:jest types build",
     "build": "tsc -p tsconfig.build.json && cp src/component-types.d.ts types",
     "contributors:add": "all-contributors add",
     "contributors:generate": "all-contributors generate",
@@ -93,19 +87,18 @@
     }
   },
   "dependencies": {
-    "@testing-library/dom": "^10.0.0"
+    "@testing-library/dom": "9.x.x || 10.x.x"
   },
   "devDependencies": {
     "@jest/globals": "^29.7.0",
-    "@sveltejs/vite-plugin-svelte": "^2.0.0 || ^3.0.0 || ^4.0.0",
-    "@testing-library/jest-dom": "^6.3.0",
-    "@testing-library/user-event": "^14.5.2",
+    "@sveltejs/vite-plugin-svelte": "^5.0.3",
+    "@testing-library/jest-dom": "^6.6.3",
+    "@testing-library/user-event": "^14.6.1",
     "@typescript-eslint/eslint-plugin": "^8.0.0",
     "@typescript-eslint/parser": "^8.0.0",
-    "@vitest/coverage-v8": "0.x.x || ^1.0.0 || ^2.0.2",
+    "@vitest/coverage-v8": "^3.1.3",
     "all-contributors-cli": "^6.26.1",
     "doctoc": "^2.2.1",
-    "esbuild": "*",
     "eslint": "^8.57.0",
     "eslint-config-prettier": "^9.1.0",
     "eslint-config-standard": "^17.1.0",
@@ -114,20 +107,20 @@
     "eslint-plugin-promise": "^6.4.0",
     "eslint-plugin-simple-import-sort": "^12.1.1",
     "eslint-plugin-svelte": "^2.42.0",
-    "expect-type": "^1.1.0",
-    "happy-dom": "^16.3.0",
+    "expect-type": "^1.2.1",
+    "happy-dom": "^17.4.6",
     "jest": "^29.7.0",
     "jest-environment-jsdom": "^29.7.0",
-    "jsdom": "^25.0.0",
+    "jsdom": "^26.1.0",
     "npm-run-all": "^4.1.5",
-    "prettier": "^3.3.3",
-    "prettier-plugin-svelte": "^3.2.5",
-    "svelte": "^3 || ^4 || ^5 || ^5.0.0-next.0",
-    "svelte-check": "^3.0.0 || ^4.0.4",
+    "prettier": "^3.5.3",
+    "prettier-plugin-svelte": "^3.3.3",
+    "svelte": "^5.28.2",
+    "svelte-check": "^4.1.7",
     "svelte-jester": "^5.0.0",
-    "typescript": "^5.5.3",
+    "typescript": "^5.8.3",
     "typescript-svelte-plugin": "^0.3.46",
-    "vite": "^4.0.0 || ^5.3.3",
-    "vitest": "0.x.x || ^1.0.0 || ^2.0.2"
+    "vite": "^6.3.5",
+    "vitest": "^3.1.3"
   }
 }
diff --git a/scripts/changed-files b/scripts/changed-files
deleted file mode 100755
index 1275bd8..0000000
--- a/scripts/changed-files
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/usr/bin/env bash
-
-git diff --name-only --diff-filter=d main
diff --git a/scripts/install-dependencies b/scripts/install-dependencies
index 8f403a0..aef6257 100755
--- a/scripts/install-dependencies
+++ b/scripts/install-dependencies
@@ -2,30 +2,34 @@
 # Install dependencies for a given version of Svelte
 set -euxo pipefail
 
-svelte_version=${1}
-node_version=$(node --version)
+svelte_version="${1-}"
+node_version=$(node --version | sed 's/^v\([0-9]*\).*/\1/')
+env_dir="tests/envs/svelte$svelte_version"
+env_dir_by_node="$env_dir/node$node_version"
 
-rm -rf node_modules
-npm install --no-package-lock
-
-if [[ "${svelte_version}" == "3" ]]; then
-  npm uninstall --no-save vite vitest @vitest/coverage-v8 @sveltejs/vite-plugin-svelte svelte-check svelte
-  npm install --no-save vite@4 vitest@0.x.x @vitest/coverage-v8@0.x.x @sveltejs/vite-plugin-svelte@2 svelte-check@3 svelte@3
-elif [[ "${svelte_version}" == "4" ]]; then
-  npm uninstall --no-save @sveltejs/vite-plugin-svelte svelte
-  npm install --no-save @sveltejs/vite-plugin-svelte@3 svelte@4
+if [[ -d $env_dir_by_node ]]; then
+  env_dir="$env_dir_by_node"
 fi
 
-if [[ "${node_version}" =~ "v16" ]]; then
-  npm uninstall --no-save vite vitest @vitest/coverage-v8 @sveltejs/vite-plugin-svelte
-  npm install --no-save vite@4 vitest@0.x.x @vitest/coverage-v8@0.x.x @sveltejs/vite-plugin-svelte@2
+if [[ "$svelte_version" == "5" ]]; then
+  rm -rf coverage node_modules
+  npm install
+  exit 0
 fi
 
-npm dedupe
-installed_version=$(npm ls --depth=0 --parseable svelte@${svelte_version})
-
-if [[ -z "${installed_version}" ]]; then
-  echo "Error: expected svelte@${svelte_version}"
-  npm ls --depth=0 svelte
+if [[ -z "$svelte_version" ]]; then
+  echo "Invalid usage: missing Svelte version" >&2;
   exit 1
 fi
+
+if [[ ! -d "$env_dir" ]]; then
+  echo "Error: package.json for Svelte $svelte_version, Node $node_version not found" 1>&2
+  exit 2
+fi
+
+rm -rf coverage node_modules "$env_dir/node_modules"
+pushd "$env_dir"
+npm install --no-package-lock --engine-strict
+npm ls "$env_dir" svelte
+popd
+mv "$env_dir/node_modules" .
diff --git a/src/component-types.d.ts b/src/component-types.d.ts
index 8300243..007f1e4 100644
--- a/src/component-types.d.ts
+++ b/src/component-types.d.ts
@@ -1,4 +1,4 @@
-/* eslint-disable @typescript-eslint/no-explicit-any, @typescript-eslint/no-redundant-type-constituents */
+/* eslint-disable @typescript-eslint/no-explicit-any */
 import type {
   Component as ModernComponent,
   ComponentConstructorOptions as LegacyConstructorOptions,
diff --git a/tests/envs/svelte3/node16/package.json b/tests/envs/svelte3/node16/package.json
new file mode 100644
index 0000000..8acb921
--- /dev/null
+++ b/tests/envs/svelte3/node16/package.json
@@ -0,0 +1,24 @@
+{
+  "private": true,
+  "engines": {
+    "node": "16.x.x"
+  },
+  "devDependencies": {
+    "@sveltejs/vite-plugin-svelte": "2.x.x",
+    "@testing-library/dom": "9.x.x",
+    "@testing-library/jest-dom": "^6.6.3",
+    "@testing-library/user-event": "^14.6.1",
+    "@vitest/coverage-v8": "0.x.x",
+    "expect-type": "^1.2.1",
+    "happy-dom": "14.x.x",
+    "jest": "^29.7.0",
+    "jest-environment-jsdom": "^29.7.0",
+    "jsdom": "22.x.x",
+    "npm-run-all": "^4.1.5",
+    "svelte": "3.x.x",
+    "svelte-check": "3.x.x",
+    "svelte-jester": "3.x.x",
+    "vite": "4.x.x",
+    "vitest": "0.x.x"
+  }
+}
diff --git a/tests/envs/svelte3/package.json b/tests/envs/svelte3/package.json
new file mode 100644
index 0000000..d563d97
--- /dev/null
+++ b/tests/envs/svelte3/package.json
@@ -0,0 +1,24 @@
+{
+  "private": true,
+  "engines": {
+    "node": ">=18"
+  },
+  "devDependencies": {
+    "@sveltejs/vite-plugin-svelte": "2.x.x",
+    "@testing-library/dom": "^10.4.0",
+    "@testing-library/jest-dom": "^6.6.3",
+    "@testing-library/user-event": "^14.6.1",
+    "@vitest/coverage-v8": "0.x.x",
+    "expect-type": "^1.2.1",
+    "happy-dom": "^17.4.6",
+    "jest": "^29.7.0",
+    "jest-environment-jsdom": "^29.7.0",
+    "jsdom": "^26.1.0",
+    "npm-run-all": "^4.1.5",
+    "svelte": "3.x.x",
+    "svelte-check": "3.x.x",
+    "svelte-jester": "3.x.x",
+    "vite": "4.x.x",
+    "vitest": "0.x.x"
+  }
+}
diff --git a/tests/envs/svelte4/node16/package.json b/tests/envs/svelte4/node16/package.json
new file mode 100644
index 0000000..ce420a1
--- /dev/null
+++ b/tests/envs/svelte4/node16/package.json
@@ -0,0 +1,24 @@
+{
+  "private": true,
+  "engines": {
+    "node": "16.x.x"
+  },
+  "devDependencies": {
+    "@sveltejs/vite-plugin-svelte": "2.x.x",
+    "@testing-library/dom": "9.x.x",
+    "@testing-library/jest-dom": "^6.6.3",
+    "@testing-library/user-event": "^14.6.1",
+    "@vitest/coverage-v8": "0.x.x",
+    "expect-type": "^1.2.1",
+    "happy-dom": "14.x.x",
+    "jest": "^29.7.0",
+    "jest-environment-jsdom": "^29.7.0",
+    "jsdom": "22.x.x",
+    "npm-run-all": "^4.1.5",
+    "svelte": "4.x.x",
+    "svelte-check": "3.x.x",
+    "svelte-jester": "3.x.x",
+    "vite": "4.x.x",
+    "vitest": "0.x.x"
+  }
+}
diff --git a/tests/envs/svelte4/package.json b/tests/envs/svelte4/package.json
new file mode 100644
index 0000000..b90351d
--- /dev/null
+++ b/tests/envs/svelte4/package.json
@@ -0,0 +1,24 @@
+{
+  "private": true,
+  "engines": {
+    "node": ">=18"
+  },
+  "devDependencies": {
+    "@sveltejs/vite-plugin-svelte": "3.x.x",
+    "@testing-library/dom": "^10.4.0",
+    "@testing-library/jest-dom": "^6.6.3",
+    "@testing-library/user-event": "^14.6.1",
+    "@vitest/coverage-v8": "2.x.x",
+    "expect-type": "^1.2.1",
+    "happy-dom": "^17.4.6",
+    "jest": "^29.7.0",
+    "jest-environment-jsdom": "^29.7.0",
+    "jsdom": "^26.1.0",
+    "npm-run-all": "^4.1.5",
+    "svelte": "4.x.x",
+    "svelte-check": "^4.1.7",
+    "svelte-jester": "^5.0.0",
+    "vite": "5.x.x",
+    "vitest": "2.x.x"
+  }
+}
diff --git a/vite.config.js b/vite.config.js
index 75bd66a..65e1ca7 100644
--- a/vite.config.js
+++ b/vite.config.js
@@ -6,9 +6,8 @@ import { defineConfig } from 'vite'
 
 const require = createRequire(import.meta.url)
 
-// https://vitejs.dev/config/
 export default defineConfig({
-  plugins: [svelte(), svelteTesting()],
+  plugins: [svelte({ hot: false }), svelteTesting()],
   test: {
     environment: 'jsdom',
     setupFiles: ['./tests/_vitest-setup.js'],

From 1aa370137003ce8e887d96f881d52c33d3dd6f12 Mon Sep 17 00:00:00 2001
From: Michael Cousins <michael@cousins.io>
Date: Fri, 9 May 2025 12:21:42 -0400
Subject: [PATCH 5/5] style: update to ESLint v9 and rework lint config (#438)

---
 .eslintignore                    |  6 --
 .eslintrc.cjs                    | 45 ---------------
 .github/dependabot.yml           |  9 ---
 .prettierignore                  |  3 -
 .prettierrc.yaml                 |  9 ---
 eslint.config.js                 | 95 ++++++++++++++++++++++++++++++++
 jest.config.js                   |  6 +-
 package.json                     | 20 ++++---
 prettier.config.js               | 14 +++++
 src/core/index.js                | 14 +----
 src/index.js                     |  1 -
 src/pure.js                      | 17 ++++--
 src/vite.js                      | 12 ++--
 tests/_env.js                    |  2 +-
 tests/act.test.js                | 10 ++--
 tests/context.test.js            |  6 +-
 tests/events.test.js             | 10 ++--
 tests/fixtures/Typed.svelte      |  2 +-
 tests/fixtures/TypedRunes.svelte |  2 +-
 tests/render.test.js             | 27 ++++-----
 tests/rerender.test.js           |  4 +-
 tests/transition.test.js         | 13 +++--
 22 files changed, 182 insertions(+), 145 deletions(-)
 delete mode 100644 .eslintignore
 delete mode 100644 .eslintrc.cjs
 delete mode 100644 .prettierrc.yaml
 create mode 100644 eslint.config.js
 create mode 100644 prettier.config.js

diff --git a/.eslintignore b/.eslintignore
deleted file mode 100644
index 39f9d9e..0000000
--- a/.eslintignore
+++ /dev/null
@@ -1,6 +0,0 @@
-scripts/*
-.eslintignore
-.prettierignore
-.github/workflows/*
-*.md
-types
diff --git a/.eslintrc.cjs b/.eslintrc.cjs
deleted file mode 100644
index 77f8b7c..0000000
--- a/.eslintrc.cjs
+++ /dev/null
@@ -1,45 +0,0 @@
-module.exports = {
-  root: true,
-  env: {
-    browser: true,
-    es6: true,
-  },
-  extends: ['standard', 'plugin:svelte/recommended', 'prettier'],
-  plugins: ['svelte', 'simple-import-sort'],
-  rules: {
-    'simple-import-sort/imports': 'error',
-    'simple-import-sort/exports': 'error',
-  },
-  overrides: [
-    {
-      files: ['*.svelte'],
-      parser: 'svelte-eslint-parser',
-      parserOptions: {
-        parser: '@typescript-eslint/parser',
-      },
-      rules: {
-        'no-undef-init': 'off',
-        'prefer-const': 'off',
-        'svelte/no-unused-svelte-ignore': 'off',
-      },
-    },
-    {
-      files: ['*.ts'],
-      parser: '@typescript-eslint/parser',
-      parserOptions: {
-        project: './tsconfig.json',
-      },
-      extends: [
-        'plugin:@typescript-eslint/strict-type-checked',
-        'plugin:@typescript-eslint/stylistic-type-checked',
-        'prettier',
-      ],
-    },
-  ],
-  parserOptions: {
-    ecmaVersion: 2022,
-    sourceType: 'module',
-  },
-  globals: { afterEach: 'readonly', $state: 'readonly', $props: 'readonly' },
-  ignorePatterns: ['!/.*'],
-}
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index c9eb8a7..434a8bb 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -23,15 +23,6 @@ updates:
       development:
         dependency-type: 'development'
 
-    # TODO(mcous, 2024-04-30): update to ESLint v9 + flat config
-    ignore:
-      - dependency-name: 'eslint'
-        versions: ['>=9']
-      - dependency-name: 'eslint-plugin-n'
-        versions: ['>=17']
-      - dependency-name: 'eslint-plugin-promise'
-        versions: ['>=7']
-
   # Update GitHub Actions dependencies
   - package-ecosystem: 'github-actions'
     directory: '/'
diff --git a/.prettierignore b/.prettierignore
index 5e50c20..c750ecf 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -1,4 +1 @@
-scripts/*
-.eslintignore
-.prettierignore
 .all-contributorsrc
diff --git a/.prettierrc.yaml b/.prettierrc.yaml
deleted file mode 100644
index 0a2ace3..0000000
--- a/.prettierrc.yaml
+++ /dev/null
@@ -1,9 +0,0 @@
-semi: false
-singleQuote: true
-trailingComma: es5
-plugins:
-  - prettier-plugin-svelte
-overrides:
-  - files: '*.svelte'
-    options:
-      parser: svelte
diff --git a/eslint.config.js b/eslint.config.js
new file mode 100644
index 0000000..c03de8c
--- /dev/null
+++ b/eslint.config.js
@@ -0,0 +1,95 @@
+import js from '@eslint/js'
+import eslintPluginVitest from '@vitest/eslint-plugin'
+import eslintConfigPrettier from 'eslint-config-prettier'
+import eslintPluginJestDom from 'eslint-plugin-jest-dom'
+import eslintPluginPromise from 'eslint-plugin-promise'
+import eslintPluginSimpleImportSort from 'eslint-plugin-simple-import-sort'
+import eslintPluginSvelte from 'eslint-plugin-svelte'
+import eslintPluginTestingLibrary from 'eslint-plugin-testing-library'
+import eslintPluginUnicorn from 'eslint-plugin-unicorn'
+import globals from 'globals'
+import tseslint from 'typescript-eslint'
+
+export default tseslint.config(
+  js.configs.recommended,
+  tseslint.configs.strict,
+  tseslint.configs.stylistic,
+  eslintPluginUnicorn.configs['flat/recommended'],
+  eslintPluginPromise.configs['flat/recommended'],
+  eslintPluginSvelte.configs['flat/recommended'],
+  eslintPluginSvelte.configs['flat/prettier'],
+  eslintConfigPrettier,
+  {
+    name: 'settings',
+    languageOptions: {
+      ecmaVersion: 'latest',
+      sourceType: 'module',
+      parserOptions: {
+        parser: tseslint.parser,
+        extraFileExtensions: ['.svelte'],
+      },
+      globals: {
+        ...globals.browser,
+        ...globals.node,
+        ...globals.jest,
+      },
+    },
+  },
+  {
+    name: 'ignores',
+    ignores: ['coverage', 'types'],
+  },
+  {
+    name: 'simple-import-sort',
+    plugins: {
+      'simple-import-sort': eslintPluginSimpleImportSort,
+    },
+    rules: {
+      'simple-import-sort/imports': 'error',
+      'simple-import-sort/exports': 'error',
+    },
+  },
+  {
+    name: 'tests',
+    files: ['**/*.test.js'],
+    extends: [
+      eslintPluginVitest.configs.recommended,
+      eslintPluginJestDom.configs['flat/recommended'],
+      eslintPluginTestingLibrary.configs['flat/dom'],
+    ],
+    rules: {
+      'testing-library/no-node-access': [
+        'error',
+        { allowContainerFirstChild: true },
+      ],
+    },
+  },
+  {
+    name: 'extras',
+    rules: {
+      'unicorn/prevent-abbreviations': 'off',
+    },
+  },
+  {
+    name: 'svelte-extras',
+    files: ['**/*.svelte'],
+    rules: {
+      'svelte/no-unused-svelte-ignore': 'off',
+      'unicorn/filename-case': ['error', { case: 'pascalCase' }],
+      'unicorn/no-useless-undefined': 'off',
+    },
+  },
+  {
+    name: 'ts-extras',
+    files: ['**/*.ts'],
+    extends: [
+      tseslint.configs.strictTypeChecked,
+      tseslint.configs.stylisticTypeChecked,
+    ],
+    languageOptions: {
+      parserOptions: {
+        projectService: true,
+      },
+    },
+  }
+)
diff --git a/jest.config.js b/jest.config.js
index ff518c4..b590229 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -1,7 +1,9 @@
 import { VERSION as SVELTE_VERSION } from 'svelte/compiler'
 
 const SVELTE_TRANSFORM_PATTERN =
-  SVELTE_VERSION >= '5' ? '^.+\\.svelte(?:\\.js)?$' : '^.+\\.svelte$'
+  SVELTE_VERSION >= '5'
+    ? String.raw`^.+\.svelte(?:\.js)?$`
+    : String.raw`^.+\.svelte$`
 
 export default {
   testMatch: ['<rootDir>/tests/**/*.test.js'],
@@ -15,7 +17,7 @@ export default {
   injectGlobals: false,
   moduleNameMapper: {
     '^vitest$': '<rootDir>/tests/_jest-vitest-alias.js',
-    '^@testing-library\\/svelte$': '<rootDir>/src/index.js',
+    [String.raw`^@testing-library\/svelte$`]: '<rootDir>/src/index.js',
   },
   resetMocks: true,
   restoreMocks: true,
diff --git a/package.json b/package.json
index 7e50de7..fea66a7 100644
--- a/package.json
+++ b/package.json
@@ -90,24 +90,25 @@
     "@testing-library/dom": "9.x.x || 10.x.x"
   },
   "devDependencies": {
+    "@eslint/js": "^9.26.0",
     "@jest/globals": "^29.7.0",
     "@sveltejs/vite-plugin-svelte": "^5.0.3",
     "@testing-library/jest-dom": "^6.6.3",
     "@testing-library/user-event": "^14.6.1",
-    "@typescript-eslint/eslint-plugin": "^8.0.0",
-    "@typescript-eslint/parser": "^8.0.0",
     "@vitest/coverage-v8": "^3.1.3",
+    "@vitest/eslint-plugin": "^1.1.44",
     "all-contributors-cli": "^6.26.1",
     "doctoc": "^2.2.1",
-    "eslint": "^8.57.0",
-    "eslint-config-prettier": "^9.1.0",
-    "eslint-config-standard": "^17.1.0",
-    "eslint-plugin-import": "^2.29.1",
-    "eslint-plugin-n": "^16.6.2",
-    "eslint-plugin-promise": "^6.4.0",
+    "eslint": "^9.26.0",
+    "eslint-config-prettier": "^10.1.5",
+    "eslint-plugin-jest-dom": "^5.5.0",
+    "eslint-plugin-promise": "^7.2.1",
     "eslint-plugin-simple-import-sort": "^12.1.1",
-    "eslint-plugin-svelte": "^2.42.0",
+    "eslint-plugin-svelte": "^3.5.1",
+    "eslint-plugin-testing-library": "^7.1.1",
+    "eslint-plugin-unicorn": "^59.0.1",
     "expect-type": "^1.2.1",
+    "globals": "^16.1.0",
     "happy-dom": "^17.4.6",
     "jest": "^29.7.0",
     "jest-environment-jsdom": "^29.7.0",
@@ -119,6 +120,7 @@
     "svelte-check": "^4.1.7",
     "svelte-jester": "^5.0.0",
     "typescript": "^5.8.3",
+    "typescript-eslint": "^8.32.0",
     "typescript-svelte-plugin": "^0.3.46",
     "vite": "^6.3.5",
     "vitest": "^3.1.3"
diff --git a/prettier.config.js b/prettier.config.js
new file mode 100644
index 0000000..8c5a52d
--- /dev/null
+++ b/prettier.config.js
@@ -0,0 +1,14 @@
+export default {
+  semi: false,
+  singleQuote: true,
+  trailingComma: 'es5',
+  plugins: ['prettier-plugin-svelte'],
+  overrides: [
+    {
+      files: '*.svelte',
+      options: {
+        parser: 'svelte',
+      },
+    },
+  ],
+}
diff --git a/src/core/index.js b/src/core/index.js
index f4a40aa..9e41adf 100644
--- a/src/core/index.js
+++ b/src/core/index.js
@@ -7,10 +7,7 @@
  */
 import * as LegacyCore from './legacy.js'
 import * as ModernCore from './modern.svelte.js'
-import {
-  createValidateOptions,
-  UnknownSvelteOptionsError,
-} from './validate-options.js'
+import { createValidateOptions } from './validate-options.js'
 
 const { mount, unmount, updateProps, allowedOptions } =
   ModernCore.IS_MODERN_SVELTE ? ModernCore : LegacyCore
@@ -18,10 +15,5 @@ const { mount, unmount, updateProps, allowedOptions } =
 /** Validate component options. */
 const validateOptions = createValidateOptions(allowedOptions)
 
-export {
-  mount,
-  UnknownSvelteOptionsError,
-  unmount,
-  updateProps,
-  validateOptions,
-}
+export { mount, unmount, updateProps, validateOptions }
+export { UnknownSvelteOptionsError } from './validate-options.js'
diff --git a/src/index.js b/src/index.js
index 2704824..5a65c08 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,4 +1,3 @@
-/* eslint-disable import/export */
 import { act, cleanup } from './pure.js'
 
 // If we're running in a test runner that supports afterEach
diff --git a/src/pure.js b/src/pure.js
index 875f87c..44e68d6 100644
--- a/src/pure.js
+++ b/src/pure.js
@@ -65,6 +65,7 @@ const render = (Component, options = {}, renderOptions = {}) => {
   const queries = getQueriesForElement(baseElement, renderOptions.queries)
 
   const target =
+    // eslint-disable-next-line unicorn/prefer-dom-node-append
     options.target ?? baseElement.appendChild(document.createElement('div'))
 
   targetCache.add(target)
@@ -116,14 +117,18 @@ const cleanupTarget = (target) => {
   const inCache = targetCache.delete(target)
 
   if (inCache && target.parentNode === document.body) {
-    document.body.removeChild(target)
+    target.remove()
   }
 }
 
 /** Unmount all components and remove elements added to `<body>`. */
 const cleanup = () => {
-  componentCache.forEach(cleanupComponent)
-  targetCache.forEach(cleanupTarget)
+  for (const component of componentCache) {
+    cleanupComponent(component)
+  }
+  for (const target of targetCache) {
+    cleanupTarget(target)
+  }
 }
 
 /**
@@ -163,12 +168,12 @@ const fireEvent = async (...args) => {
   return event
 }
 
-Object.keys(baseFireEvent).forEach((key) => {
+for (const [key, baseEvent] of Object.entries(baseFireEvent)) {
   fireEvent[key] = async (...args) => {
-    const event = baseFireEvent[key](...args)
+    const event = baseEvent(...args)
     await tick()
     return event
   }
-})
+}
 
 export { act, cleanup, fireEvent, render }
diff --git a/src/vite.js b/src/vite.js
index 1ad712f..b57c886 100644
--- a/src/vite.js
+++ b/src/vite.js
@@ -1,5 +1,5 @@
-import { dirname, join } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import path from 'node:path'
+import url from 'node:url'
 
 /**
  * Vite plugin to configure @testing-library/svelte.
@@ -50,8 +50,8 @@ const addBrowserCondition = (config) => {
   const browserConditionIndex = conditions.indexOf('browser')
 
   if (
-    nodeConditionIndex >= 0 &&
-    (nodeConditionIndex < browserConditionIndex || browserConditionIndex < 0)
+    nodeConditionIndex !== -1 &&
+    (nodeConditionIndex < browserConditionIndex || browserConditionIndex === -1)
   ) {
     conditions.splice(nodeConditionIndex, 0, 'browser')
   }
@@ -77,7 +77,9 @@ const addAutoCleanup = (config) => {
     setupFiles = [setupFiles]
   }
 
-  setupFiles.push(join(dirname(fileURLToPath(import.meta.url)), './vitest.js'))
+  setupFiles.push(
+    path.join(path.dirname(url.fileURLToPath(import.meta.url)), './vitest.js')
+  )
 
   test.setupFiles = setupFiles
   config.test = test
diff --git a/tests/_env.js b/tests/_env.js
index f637d6f..96b30f4 100644
--- a/tests/_env.js
+++ b/tests/_env.js
@@ -1,6 +1,6 @@
 import { VERSION as SVELTE_VERSION } from 'svelte/compiler'
 
-export const IS_JSDOM = window.navigator.userAgent.includes('jsdom')
+export const IS_JSDOM = globalThis.navigator.userAgent.includes('jsdom')
 
 export const IS_HAPPYDOM = !IS_JSDOM // right now it's happy or js
 
diff --git a/tests/act.test.js b/tests/act.test.js
index 75c9ded..9308d75 100644
--- a/tests/act.test.js
+++ b/tests/act.test.js
@@ -1,14 +1,14 @@
 import { setTimeout } from 'node:timers/promises'
 
-import { act, render } from '@testing-library/svelte'
+import { act, render, screen } from '@testing-library/svelte'
 import { describe, expect, test } from 'vitest'
 
 import Comp from './fixtures/Comp.svelte'
 
 describe('act', () => {
   test('state updates are flushed', async () => {
-    const { getByText } = render(Comp)
-    const button = getByText('Button')
+    render(Comp)
+    const button = screen.getByText('Button')
 
     expect(button).toHaveTextContent('Button')
 
@@ -20,8 +20,8 @@ describe('act', () => {
   })
 
   test('accepts async functions', async () => {
-    const { getByText } = render(Comp)
-    const button = getByText('Button')
+    render(Comp)
+    const button = screen.getByText('Button')
 
     await act(async () => {
       await setTimeout(100)
diff --git a/tests/context.test.js b/tests/context.test.js
index da54b9d..e9d83eb 100644
--- a/tests/context.test.js
+++ b/tests/context.test.js
@@ -1,4 +1,4 @@
-import { render } from '@testing-library/svelte'
+import { render, screen } from '@testing-library/svelte'
 import { expect, test } from 'vitest'
 
 import Comp from './fixtures/Context.svelte'
@@ -6,9 +6,9 @@ import Comp from './fixtures/Context.svelte'
 test('can set a context', () => {
   const message = 'Got it'
 
-  const { getByText } = render(Comp, {
+  render(Comp, {
     context: new Map(Object.entries({ foo: { message } })),
   })
 
-  expect(getByText(message)).toBeTruthy()
+  expect(screen.getByText(message)).toBeInTheDocument()
 })
diff --git a/tests/events.test.js b/tests/events.test.js
index e0aba4d..9864692 100644
--- a/tests/events.test.js
+++ b/tests/events.test.js
@@ -1,12 +1,12 @@
-import { fireEvent, render } from '@testing-library/svelte'
+import { fireEvent, render, screen } from '@testing-library/svelte'
 import { describe, expect, test } from 'vitest'
 
 import Comp from './fixtures/Comp.svelte'
 
 describe('events', () => {
   test('state changes are flushed after firing an event', async () => {
-    const { getByText } = render(Comp, { props: { name: 'World' } })
-    const button = getByText('Button')
+    render(Comp, { props: { name: 'World' } })
+    const button = screen.getByText('Button')
 
     const result = fireEvent.click(button)
 
@@ -15,8 +15,8 @@ describe('events', () => {
   })
 
   test('calling `fireEvent` directly works too', async () => {
-    const { getByText } = render(Comp, { props: { name: 'World' } })
-    const button = getByText('Button')
+    render(Comp, { props: { name: 'World' } })
+    const button = screen.getByText('Button')
 
     const result = fireEvent(
       button,
diff --git a/tests/fixtures/Typed.svelte b/tests/fixtures/Typed.svelte
index 383214f..dad8e14 100644
--- a/tests/fixtures/Typed.svelte
+++ b/tests/fixtures/Typed.svelte
@@ -4,7 +4,7 @@
   export let name: string
   export let count: number
 
-  export const hello: string = 'hello'
+  export const hello = 'hello'
 
   const dispatch = createEventDispatcher<{ greeting: string }>()
 </script>
diff --git a/tests/fixtures/TypedRunes.svelte b/tests/fixtures/TypedRunes.svelte
index 979be41..0fb690b 100644
--- a/tests/fixtures/TypedRunes.svelte
+++ b/tests/fixtures/TypedRunes.svelte
@@ -1,7 +1,7 @@
 <script lang="ts">
   const { name, count }: { name: string; count: number } = $props()
 
-  export const hello: string = 'hello'
+  export const hello = 'hello'
 </script>
 
 <h1>hello {name}</h1>
diff --git a/tests/render.test.js b/tests/render.test.js
index 943c920..19bf2c3 100644
--- a/tests/render.test.js
+++ b/tests/render.test.js
@@ -1,4 +1,4 @@
-import { render } from '@testing-library/svelte'
+import { render, screen } from '@testing-library/svelte'
 import { beforeAll, describe, expect, test } from 'vitest'
 
 import { COMPONENT_FIXTURES } from './_env.js'
@@ -12,14 +12,14 @@ describe.each(COMPONENT_FIXTURES)('render ($mode)', ({ component }) => {
   })
 
   test('renders component into the document', () => {
-    const { getByText } = render(Comp, { props })
+    render(Comp, { props })
 
-    expect(getByText('Hello World!')).toBeInTheDocument()
+    expect(screen.getByText('Hello World!')).toBeInTheDocument()
   })
 
   test('accepts props directly', () => {
-    const { getByText } = render(Comp, props)
-    expect(getByText('Hello World!')).toBeInTheDocument()
+    render(Comp, props)
+    expect(screen.getByText('Hello World!')).toBeInTheDocument()
   })
 
   test('throws error when mixing svelte component options and props', () => {
@@ -35,8 +35,8 @@ describe.each(COMPONENT_FIXTURES)('render ($mode)', ({ component }) => {
   })
 
   test('should return a container object wrapping the DOM of the rendered component', () => {
-    const { container, getByTestId } = render(Comp, props)
-    const firstElement = getByTestId('test')
+    const { container } = render(Comp, props)
+    const firstElement = screen.getByTestId('test')
 
     expect(container.firstChild).toBe(firstElement)
   })
@@ -73,17 +73,14 @@ describe.each(COMPONENT_FIXTURES)('render ($mode)', ({ component }) => {
     const baseElement = document.body
     const target = document.createElement('section')
     const anchor = document.createElement('div')
-    baseElement.appendChild(target)
-    target.appendChild(anchor)
+    baseElement.append(target)
+    target.append(anchor)
 
-    const { getByTestId } = render(
-      Comp,
-      { props, target, anchor },
-      { baseElement }
-    )
-    const firstElement = getByTestId('test')
+    render(Comp, { props, target, anchor }, { baseElement })
+    const firstElement = screen.getByTestId('test')
 
     expect(target.firstChild).toBe(firstElement)
+    // eslint-disable-next-line testing-library/no-node-access
     expect(target.lastChild).toBe(anchor)
   })
 })
diff --git a/tests/rerender.test.js b/tests/rerender.test.js
index 2a20143..2fdff0d 100644
--- a/tests/rerender.test.js
+++ b/tests/rerender.test.js
@@ -39,8 +39,8 @@ describe.each(COMPONENT_FIXTURES)('rerender ($mode)', ({ mode, component }) => {
       ? { name: 'World' }
       : { accessors: true, props: { name: 'World' } }
 
-    const { component, getByText } = render(Comp, componentOptions)
-    const element = getByText('Hello World!')
+    const { component } = render(Comp, componentOptions)
+    const element = screen.getByText('Hello World!')
 
     expect(element).toBeInTheDocument()
     expect(component.name).toBe('World')
diff --git a/tests/transition.test.js b/tests/transition.test.js
index 3acf1d0..27b236e 100644
--- a/tests/transition.test.js
+++ b/tests/transition.test.js
@@ -6,12 +6,13 @@ import { IS_JSDOM, IS_SVELTE_5 } from './_env.js'
 import Transitioner from './fixtures/Transitioner.svelte'
 
 describe.skipIf(IS_SVELTE_5)('transitions', () => {
-  beforeEach(() => {
-    if (!IS_JSDOM) return
-
-    const raf = (fn) => setTimeout(() => fn(new Date()), 16)
-    vi.stubGlobal('requestAnimationFrame', raf)
-  })
+  if (IS_JSDOM) {
+    beforeEach(() => {
+      vi.stubGlobal('requestAnimationFrame', (fn) =>
+        setTimeout(() => fn(new Date()), 16)
+      )
+    })
+  }
 
   test('on:introend', async () => {
     const user = userEvent.setup()