fixup: move dependency installs to a script

.github/workflows/release.yml

@@ -51,12 +51,7 @@ jobs:
           node-version: ${{ matrix.node }}
 
       - name: 📥 Download deps
-        run: |
-          npm install --no-package-lock
-          npm install --no-save svelte@${SVELTE_VERSION} @sveltejs/vite-plugin-svelte@${VITE_PLUGIN_VERSION}
-        env:
-          SVELTE_VERSION: ${{ matrix.svelte }}
-          VITE_PLUGIN_VERSION: ${{ matrix.svelte == '5' && '4' || matrix.svelte == '4' && '3' || '2' }}
+        run: ./scripts/install-dependencies ${{ matrix.svelte }}
 
       - name: ▶️ Run ${{ matrix.check }}
         run: npm run ${{ matrix.check }}

package.json

@@ -95,7 +95,7 @@
   },
   "devDependencies": {
     "@jest/globals": "^29.7.0",
-    "@sveltejs/vite-plugin-svelte": "^3.0.0 || ^4.0.0",
+    "@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",
     "@typescript-eslint/eslint-plugin": "^8.0.0",

scripts/install-dependencies

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+# Install dependencies for a given version of Svelte
+set -euo pipefail
+
+svelte_version=${1}
+
+rm -rf node_modules
+npm install --no-package-lock
+
+if [[ "${svelte_version}" == "4" ]]; then
+  npm uninstall --no-save @sveltejs/vite-plugin-svelte svelte
+  npm install --no-save @sveltejs/vite-plugin-svelte@3 svelte@4
+elif [[ "${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@1 @vitest/coverage-v8@1 @sveltejs/vite-plugin-svelte@2 svelte-check@3 svelte@3
+fi
+
+npm ls --depth=0 svelte