feat(docs): Add dropdown to link to previous docs

Author: clemyan

.pnp.cjs

@@ -6,6 +6,8 @@ require(`@yarnpkg/monorepo/scripts/setup-local-plugins`);
 
 const fs = require(`fs`);
 
+const {YarnVersion} = require(`@yarnpkg/core`);
+
 const lightCodeTheme = require(`prism-react-renderer/themes/github`);
 const darkCodeTheme = require(`prism-react-renderer/themes/dracula`);
 
@@ -73,6 +75,11 @@ const config = {
         },
         docs: {
           routeBasePath: `/`,
+          versions: {
+            current: {
+              label: `master (${YarnVersion})`,
+            },
+          },
           sidebarPath: require.resolve(`./sidebars.js`),
           editUrl: `https://github.com/yarnpkg/berry/edit/master/packages/docusaurus/`,
           remarkPlugins,
@@ -145,6 +152,21 @@ const config = {
             label: `Blog`,
             position: `left`,
           },
+          {
+            type: `docsVersionDropdown`,
+            position: `right`,
+            dropdownActiveClassDisabled: true,
+            dropdownItemsAfter: [
+              {
+                label: `3.6.4`,
+                href: `https://v3.yarnpkg.com`,
+              },
+              {
+                label: `1.22.19`,
+                href: `https://classic.yarnpkg.com/en/docs`,
+              },
+            ],
+          },
           {
             href: `https://discord.gg/yarnpkg`,
             label: `Discord`,

packages/docusaurus/docusaurus.config.js

@@ -22,6 +22,7 @@
     "@primer/octicons-react": "^17.7.0",
     "@types/three": "^0.144.0",
     "@yarnpkg/cli": "workspace:^",
+    "@yarnpkg/core": "workspace:^",
     "@yarnpkg/parsers": "workspace:^",
     "algoliasearch": "^4.14.2",
     "clipanion": "^4.0.0-rc.2",

packages/docusaurus/package.json

@@ -5137,6 +5137,7 @@ __metadata:
     "@types/semver": "npm:^7.1.0"
     "@types/three": "npm:^0.144.0"
     "@yarnpkg/cli": "workspace:^"
+    "@yarnpkg/core": "workspace:^"
     "@yarnpkg/fslib": "workspace:^"
     "@yarnpkg/libzip": "workspace:^"
     "@yarnpkg/monorepo": "workspace:^"