perf(fslib): run removePromise in parallel (#2582)

* perf(fslib): run removePromise in parallel

* Update FakeFS.ts

Co-authored-by: Maël Nison <nison.mael@gmail.com>

.yarn/versions/6e4ec8bf.yml

@@ -0,0 +1,35 @@
+releases:
+  "@yarnpkg/cli": patch
+  "@yarnpkg/fslib": patch
+
+declined:
+  - "@yarnpkg/plugin-compat"
+  - "@yarnpkg/plugin-constraints"
+  - "@yarnpkg/plugin-dlx"
+  - "@yarnpkg/plugin-essentials"
+  - "@yarnpkg/plugin-exec"
+  - "@yarnpkg/plugin-file"
+  - "@yarnpkg/plugin-git"
+  - "@yarnpkg/plugin-github"
+  - "@yarnpkg/plugin-http"
+  - "@yarnpkg/plugin-init"
+  - "@yarnpkg/plugin-interactive-tools"
+  - "@yarnpkg/plugin-link"
+  - "@yarnpkg/plugin-node-modules"
+  - "@yarnpkg/plugin-npm"
+  - "@yarnpkg/plugin-npm-cli"
+  - "@yarnpkg/plugin-pack"
+  - "@yarnpkg/plugin-patch"
+  - "@yarnpkg/plugin-pnp"
+  - "@yarnpkg/plugin-stage"
+  - "@yarnpkg/plugin-typescript"
+  - "@yarnpkg/plugin-version"
+  - "@yarnpkg/plugin-workspace-tools"
+  - vscode-zipfs
+  - "@yarnpkg/builder"
+  - "@yarnpkg/core"
+  - "@yarnpkg/doctor"
+  - "@yarnpkg/json-proxy"
+  - "@yarnpkg/pnp"
+  - "@yarnpkg/pnpify"
+  - "@yarnpkg/shell"

packages/yarnpkg-fslib/sources/FakeFS.ts

@@ -273,9 +273,13 @@ export abstract class FakeFS<P extends Path> {
     }
 
     if (stat.isDirectory()) {
-      if (recursive)
-        for (const entry of await this.readdirPromise(p))
-          await this.removePromise(this.pathUtils.resolve(p, entry));
+      if (recursive) {
+        const entries = await this.readdirPromise(p);
+
+        await Promise.all(entries.map(entry => {
+          return this.removePromise(this.pathUtils.resolve(p, entry));
+        }));
+      }
 
       // 5 gives 1s worth of retries at worst
       let t = 0;