perf(plugin-patch): remove unneeded saveAndClose (#1700)

.yarn/versions/92d834ce.yml

@@ -0,0 +1,22 @@
+releases:
+  "@yarnpkg/cli": prerelease
+  "@yarnpkg/plugin-patch": patch
+
+declined:
+  - "@yarnpkg/plugin-compat"
+  - "@yarnpkg/plugin-constraints"
+  - "@yarnpkg/plugin-dlx"
+  - "@yarnpkg/plugin-essentials"
+  - "@yarnpkg/plugin-init"
+  - "@yarnpkg/plugin-interactive-tools"
+  - "@yarnpkg/plugin-node-modules"
+  - "@yarnpkg/plugin-npm-cli"
+  - "@yarnpkg/plugin-pack"
+  - "@yarnpkg/plugin-pnp"
+  - "@yarnpkg/plugin-stage"
+  - "@yarnpkg/plugin-typescript"
+  - "@yarnpkg/plugin-version"
+  - "@yarnpkg/plugin-workspace-tools"
+  - "@yarnpkg/builder"
+  - "@yarnpkg/core"
+  - "@yarnpkg/doctor"

packages/plugin-patch/sources/PatchFetcher.ts

@@ -49,25 +49,18 @@ export class PatchFetcher implements Fetcher {
 
     const libzip = await getLibzipPromise();
 
-    const copiedPackage = new ZipFS(tmpFile, {
+    const patchedPackage = new ZipFS(tmpFile, {
       libzip,
       create: true,
       level: opts.project.configuration.get(`compressionLevel`),
     });
 
-    await copiedPackage.mkdirpPromise(prefixPath);
+    await patchedPackage.mkdirpPromise(prefixPath);
 
     await miscUtils.releaseAfterUseAsync(async () => {
-      await copiedPackage.copyPromise(prefixPath, sourceFetch.prefixPath, {baseFs: sourceFetch.packageFs, stableSort: true});
+      await patchedPackage.copyPromise(prefixPath, sourceFetch.prefixPath, {baseFs: sourceFetch.packageFs, stableSort: true});
     }, sourceFetch.releaseFs);
 
-    copiedPackage.saveAndClose();
-
-    const patchedPackage = new ZipFS(tmpFile, {
-      libzip,
-      level: opts.project.configuration.get(`compressionLevel`),
-    });
-
     const patchFs = new CwdFS(ppath.resolve(PortablePath.root, prefixPath), {baseFs: patchedPackage});
 
     for (const patchFile of patchFiles) {