Enables garbage collection on synchronous calls (#895)

Author: arcanis

.pnp.js

@@ -0,0 +1,34 @@
+releases:
+  "@yarnpkg/cli": prerelease
+  "@yarnpkg/fslib": prerelease
+  "@yarnpkg/pnp": prerelease
+
+declined:
+  - "@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/pnpify"
+  - "@yarnpkg/shell"

.yarn/versions/546aff69.yml

@@ -792,7 +792,14 @@ export class ZipOpenFS extends BasePortableFakeFS {
       let zipFs = this.zipInstances.get(p);
 
       if (!zipFs)
-        this.zipInstances.set(p, zipFs = new ZipFS(p, getZipOptions()));
+        zipFs = new ZipFS(p, getZipOptions());
+
+      // Removing then re-adding the field allows us to easily implement
+      // a basic LRU garbage collection strategy
+      this.zipInstances.delete(p);
+      this.zipInstances.set(p, zipFs);
+
+      this.limitOpenFiles(this.maxOpenFiles);
 
       return accept(zipFs);
     } else {