Speed up test prepare script

Author: thecrypticace

packages/tailwindcss-language-server/package.json

@@ -20,7 +20,7 @@
     "create-notices-file": "node scripts/createNoticesFile.mjs",
     "prepublishOnly": "pnpm run build",
     "test": "vitest",
-    "pretest": "node tests/prepare.js"
+    "pretest": "node tests/prepare.mjs"
   },
   "bin": {
     "tailwindcss-language-server": "./bin/tailwindcss-language-server"

packages/tailwindcss-language-server/tests/prepare.js

@@ -0,0 +1,21 @@
+import { exec } from 'node:child_process'
+import * as path from 'node:path'
+import { fileURLToPath } from 'node:url'
+import { promisify } from 'node:util'
+import glob from 'fast-glob'
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url))
+
+const fixtures = glob.sync(['tests/fixtures/*/package.json', 'tests/fixtures/v4/*/package.json'], {
+  cwd: path.resolve(__dirname, '..'),
+})
+
+const execAsync = promisify(exec)
+
+await Promise.all(
+  fixtures.map(async (fixture) => {
+    console.log(`Installing dependencies for ${fixture}`)
+
+    await execAsync('npm install', { cwd: path.dirname(fixture) })
+  }),
+)