Sets the default compression to 0

.yarn/versions/6c7747db.yml

@@ -0,0 +1,34 @@
+releases:
+  "@yarnpkg/cli": major
+  "@yarnpkg/core": major
+  "@yarnpkg/plugin-essentials": major
+
+declined:
+  - "@yarnpkg/plugin-compat"
+  - "@yarnpkg/plugin-constraints"
+  - "@yarnpkg/plugin-dlx"
+  - "@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-nm"
+  - "@yarnpkg/plugin-npm"
+  - "@yarnpkg/plugin-npm-cli"
+  - "@yarnpkg/plugin-pack"
+  - "@yarnpkg/plugin-patch"
+  - "@yarnpkg/plugin-pnp"
+  - "@yarnpkg/plugin-pnpm"
+  - "@yarnpkg/plugin-stage"
+  - "@yarnpkg/plugin-typescript"
+  - "@yarnpkg/plugin-version"
+  - "@yarnpkg/plugin-workspace-tools"
+  - "@yarnpkg/builder"
+  - "@yarnpkg/doctor"
+  - "@yarnpkg/extensions"
+  - "@yarnpkg/nm"
+  - "@yarnpkg/pnpify"
+  - "@yarnpkg/sdks"

.yarnrc.yml

@@ -1,22 +1,18 @@
 changesetIgnorePatterns:
-  - ".github/**"
-  - ".yarn/cache/**"
+  - .github/**
+  - .yarn/cache/**
   - "**/*.test.{js,ts}"
-  - "packages/*/tests/**"
-  - "packages/plugin-compat/extra/**"
-  - "packages/gatsby/**"
+  - packages/*/tests/**
+  - packages/plugin-compat/extra/**
+  - packages/gatsby/**
 
-enableGlobalCache: false
+compressionLevel: mixed
 
-pnpEnableEsmLoader: true
+enableGlobalCache: false
 
 immutablePatterns:
   - .pnp.*
 
-supportedArchitectures:
-  os: [darwin, linux, win32]
-  cpu: [x64, arm64]
-
 initScope: yarnpkg
 
 npmPublishAccess: public
@@ -73,8 +69,19 @@ packageExtensions:
       typedoc-plugin-yarn:
         optional: true
 
+pnpEnableEsmLoader: true
+
 preferInteractive: true
 
+supportedArchitectures:
+  cpu:
+    - x64
+    - arm64
+  os:
+    - darwin
+    - linux
+    - win32
+
 telemetryUserId: yarnpkg/berry
 
 yarnPath: scripts/run-yarn.js

packages/gatsby/content/advanced/error-codes.md

@@ -424,3 +424,9 @@ To use it, simply pass it the `p`-prefixed code provided in the original peer re
 ```
 yarn explain peer-requirements pf649cd
 ```
+
+## YN0087 - `MIGRATION_SUCCESS`
+
+When migrating from a major version to the next, some default values may change. When that's the case, Yarn will attempt to temporarily keep the old default by pinning their values in your configuration settings.
+
+To see the exact changes applied when this message appears, check the content of the `.yarnrc.yml` file and any other file that may appear modified in your repository checkout.

packages/plugin-essentials/sources/commands/install.ts

@@ -1,10 +1,28 @@
-import {BaseCommand, WorkspaceRequiredError}                                                                                                     from '@yarnpkg/cli';
-import {Configuration, Cache, MessageName, Project, ReportError, StreamReport, formatUtils, InstallMode, execUtils, structUtils, LEGACY_PLUGINS} from '@yarnpkg/core';
-import {xfs, ppath, Filename, PortablePath}                                                                                                      from '@yarnpkg/fslib';
-import {parseSyml, stringifySyml}                                                                                                                from '@yarnpkg/parsers';
-import CI                                                                                                                                        from 'ci-info';
-import {Command, Option, Usage, UsageError}                                                                                                      from 'clipanion';
-import * as t                                                                                                                                    from 'typanion';
+import {BaseCommand, WorkspaceRequiredError}                                                                                                                            from '@yarnpkg/cli';
+import {Configuration, Cache, MessageName, Project, ReportError, StreamReport, formatUtils, InstallMode, execUtils, structUtils, LEGACY_PLUGINS, ConfigurationValueMap} from '@yarnpkg/core';
+import {xfs, ppath, Filename, PortablePath}                                                                                                                             from '@yarnpkg/fslib';
+import {parseSyml, stringifySyml}                                                                                                                                       from '@yarnpkg/parsers';
+import CI                                                                                                                                                               from 'ci-info';
+import {Command, Option, Usage, UsageError}                                                                                                                             from 'clipanion';
+import * as t                                                                                                                                                           from 'typanion';
+
+const LOCKFILE_MIGRATION_RULES: Array<{
+  selector: (version: number) => boolean;
+  name: keyof ConfigurationValueMap;
+  value: any;
+}> = [{
+  selector: v => v === -1,
+  name: `nodeLinker`,
+  value: `node-modules`,
+}, {
+  selector: v => v < 8,
+  name: `enableGlobalCache`,
+  value: false,
+}, {
+  selector: v => v < 8,
+  name: `compressionLevel`,
+  value: `mixed`,
+}];
 
 // eslint-disable-next-line arca/no-default-export
 export default class YarnCommand extends BaseCommand {
@@ -264,39 +282,6 @@ export default class YarnCommand extends BaseCommand {
       }
     }
 
-    if (configuration.projectCwd !== null && typeof configuration.sources.get(`nodeLinker`) === `undefined`) {
-      const projectCwd = configuration.projectCwd;
-
-      let content;
-      try {
-        content = await xfs.readFilePromise(ppath.join(projectCwd, Filename.lockfile), `utf8`);
-      } catch {}
-
-      // If migrating from a v1 install, we automatically enable the node-modules linker,
-      // since that's likely what the author intended to do.
-      if (content?.includes(`yarn lockfile v1`)) {
-        const nmReport = await StreamReport.start({
-          configuration,
-          json: this.json,
-          stdout: this.context.stdout,
-          includeFooter: false,
-        }, async report => {
-          report.reportInfo(MessageName.AUTO_NM_SUCCESS, `Migrating from Yarn 1; automatically enabling the compatibility node-modules linker 👍`);
-          report.reportSeparator();
-
-          configuration.use(`<compat>`, {nodeLinker: `node-modules`}, projectCwd, {overwrite: true});
-
-          await Configuration.updateConfiguration(projectCwd, {
-            nodeLinker: `node-modules`,
-          });
-        });
-
-        if (nmReport.hasErrors()) {
-          return nmReport.exitCode();
-        }
-      }
-    }
-
     if (configuration.projectCwd !== null) {
       const telemetryReport = await StreamReport.start({
         configuration,
@@ -317,6 +302,33 @@ export default class YarnCommand extends BaseCommand {
     }
 
     const {project, workspace} = await Project.find(configuration, this.context.cwd);
+
+    const compatReport = await StreamReport.start({
+      configuration,
+      json: this.json,
+      stdout: this.context.stdout,
+      includeFooter: false,
+    }, async report => {
+      const newSettings: Record<string, any> = {};
+
+      for (const rule of LOCKFILE_MIGRATION_RULES) {
+        if (rule.selector(project.lockfileLastVersion) && typeof configuration.sources.get(rule.name) === `undefined`) {
+          configuration.use(`<compat>`, {[rule.name]: rule.value}, project.cwd, {overwrite: true});
+          newSettings[rule.name] = rule.value;
+        }
+      }
+
+      if (Object.keys(newSettings).length > 0) {
+        await Configuration.updateConfiguration(project.cwd, newSettings);
+
+        report.reportInfo(MessageName.MIGRATION_SUCCESS, `Migrated your project to the latest Yarn version 🚀`);
+        report.reportSeparator();
+      }
+    });
+
+    if (compatReport.hasErrors())
+      return compatReport.exitCode();
+
     const cache = await Cache.find(configuration, {immutable: immutableCache, check: this.checkCache});
 
     if (!workspace)

packages/yarnpkg-core/sources/Configuration.ts

@@ -1,5 +1,4 @@
 import {Filename, PortablePath, npath, ppath, xfs}                                                               from '@yarnpkg/fslib';
-import {DEFAULT_COMPRESSION_LEVEL}                                                                               from '@yarnpkg/libzip';
 import {parseSyml, stringifySyml}                                                                                from '@yarnpkg/parsers';
 import camelcase                                                                                                 from 'camelcase';
 import {isCI, isPR, GITHUB_ACTIONS}                                                                              from 'ci-info';
@@ -221,7 +220,7 @@ export const coreDefinitions: {[coreSettingName: string]: SettingsDefinition} =
     description: `Zip files compression level, from 0 to 9 or mixed (a variant of 9, which stores some files uncompressed, when compression doesn't yield good results)`,
     type: SettingsType.NUMBER,
     values: [`mixed`, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
-    default: DEFAULT_COMPRESSION_LEVEL,
+    default: 0,
   },
   virtualFolder: {
     description: `Folder where the virtual packages (cf doc) will be mapped on the disk (must be named __virtual__)`,

packages/yarnpkg-core/sources/MessageName.ts

@@ -98,6 +98,7 @@ export enum MessageName {
   CONSTRAINTS_CHECK_FAILED = 84,
   UPDATED_RESOLUTION_RECORD = 85,
   EXPLAIN_PEER_DEPENDENCIES_CTA = 86,
+  MIGRATION_SUCCESS = 87,
 }
 
 export function stringifyMessageName(name: MessageName | number): string {

packages/yarnpkg-core/sources/Project.ts

@@ -44,7 +44,7 @@ import {IdentHash, DescriptorHash, LocatorHash, PackageExtensionStatus} from './
 // When upgraded, the lockfile entries have to be resolved again (but the specific
 // versions are still pinned, no worry). Bump it when you change the fields within
 // the Package type; no more no less.
-const LOCKFILE_VERSION = 7;
+const LOCKFILE_VERSION = 8;
 
 // Same thing but must be bumped when the members of the Project class changes (we
 // don't recommend our users to check-in this file, so it's fine to bump it even
@@ -232,6 +232,7 @@ export class Project {
    * If true, the data contained within `originalPackages` are from a different
    * lockfile version and need to be refreshed.
    */
+  public lockfileLastVersion: number = 0;
   public lockfileNeedsRefresh: boolean = false;
 
   /**
@@ -340,6 +341,7 @@ export class Project {
         const lockfileVersion = parsed.__metadata.version;
         const cacheKey = parsed.__metadata.cacheKey;
 
+        this.lockfileLastVersion = lockfileVersion;
         this.lockfileNeedsRefresh = lockfileVersion < LOCKFILE_VERSION;
 
         for (const key of Object.keys(parsed)) {
@@ -395,6 +397,8 @@ export class Project {
             this.storedResolutions.set(descriptor.descriptorHash, locator.locatorHash);
           }
         }
+      } else if (content.includes(`yarn lockfile v1`)) {
+        this.lockfileLastVersion = -1;
       }
     }
   }

yarn.lock

@@ -2,7 +2,7 @@
 # Manual changes might be lost - proceed with caution!
 
 __metadata:
-  version: 7
+  version: 8
   cacheKey: 10
 
 "@actions/core@npm:^1.2.6":