test: prefer pnpm install w/ fixture

package.json

@@ -40,7 +40,6 @@
   },
   "devDependencies": {
     "@eslint-sukka/node": "^6.7.0",
-    "@jsdevtools/ez-spawn": "^3.0.4",
     "@rollup/plugin-commonjs": "^28.0.0",
     "@rollup/plugin-json": "^6.1.0",
     "@rollup/plugin-node-resolve": "^15.3.0",
@@ -49,6 +48,7 @@
     "@types/chai": "^4.3.20",
     "@types/mocha": "^10.0.9",
     "@types/node": "^22.7.5",
+    "@types/which": "^3.0.4",
     "chai": "^4.5.0",
     "eslint": "^9.12.0",
     "eslint-config-sukka": "^6.7.0",
@@ -63,8 +63,10 @@
     "rollup-plugin-dts": "^6.1.1",
     "rollup2": "npm:rollup@^2.79.2",
     "rollup3": "npm:rollup@^3.29.5",
+    "tinyexec": "^0.3.1",
     "typescript": "^5.6.3",
-    "vite": "^5.4.8"
+    "vite": "^5.4.8",
+    "which": "^5.0.0"
   },
   "peerDependencies": {
     "@swc/core": ">=1.2.165",

test/index.ts

@@ -22,7 +22,8 @@ import { jestSnapshotPlugin } from 'mocha-chai-jest-snapshot';
 
 import { create, destroy } from 'memdisk';
 
-import { async as ezspawn } from '@jsdevtools/ez-spawn';
+import which from 'which';
+import { exec } from 'tinyexec';
 
 chai.should();
 chai.use(jestSnapshotPlugin());
@@ -130,7 +131,8 @@ function tests(rollupImpl: typeof rollup2 | typeof rollup3 | typeof rollup4, iso
     await Promise.all(files.map(([from, to]) => fsp.copyFile(from, to)));
 
     if (requireInstall) {
-      await ezspawn('npm install', { cwd: testDir });
+      const packageManager = (await which('pnpm', { nothrow: true })) || 'npm';
+      await exec(packageManager, ['install'], { throwOnError: true, nodeOptions: { cwd: testDir } });
     }
 
     return testDir;