chore(v2): use single method Lodash packages in docs plugin (#2519)

* chore(v2): use single method Lodash packages in docs plugin

* reorder packages

* TS types nightmare

package.json

@@ -35,7 +35,11 @@
     "@types/jest": "^24.0.23",
     "@types/loader-utils": "^1.1.3",
     "@types/lodash": "^4.14.149",
+    "@types/lodash.flatmap": "^4.5.6",
+    "@types/lodash.groupby": "^4.6.6",
     "@types/lodash.kebabcase": "^4.1.6",
+    "@types/lodash.pick": "^4.4.6",
+    "@types/lodash.pickby": "^4.6.6",
     "@types/node": "^12.12.14",
     "@types/react": "^16.9.13",
     "@types/react-dev-utils": "^9.0.1",

packages/docusaurus-plugin-content-docs/package.json

@@ -23,7 +23,10 @@
     "globby": "^10.0.1",
     "import-fresh": "^3.2.1",
     "loader-utils": "^1.2.3",
-    "lodash": "^4.17.15",
+    "lodash.flatmap": "^4.5.0",
+    "lodash.groupby": "^4.6.0",
+    "lodash.pick": "^4.4.0",
+    "lodash.pickby": "^4.6.0",
     "shelljs": "^0.8.3"
   },
   "peerDependencies": {

packages/docusaurus-plugin-content-docs/src/index.ts

@@ -5,7 +5,9 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import _ from 'lodash';
+import groupBy from 'lodash.groupby';
+import pick from 'lodash.pick';
+import pickBy from 'lodash.pickby';
 import globby from 'globby';
 import fs from 'fs-extra';
 import path from 'path';
@@ -101,13 +103,13 @@ export default function pluginContentDocs(
       const {include} = options;
       let globPattern = include.map(pattern => `${docsDir}/${pattern}`);
       if (versioning.enabled) {
-        const docsGlob = _.flatten(
-          include.map(pattern =>
+        const docsGlob = include
+          .map(pattern =>
             versionsNames.map(
               versionName => `${versionedDir}/${versionName}/${pattern}`,
             ),
-          ),
-        );
+          )
+          .reduce((a, b) => a.concat(b), []);
         const sidebarsGlob = versionsNames.map(
           versionName => `${versionedSidebarsDir}/${versionName}-sidebars.json`,
         );
@@ -149,11 +151,11 @@ export default function pluginContentDocs(
 
       // Metadata for versioned docs.
       if (versioning.enabled) {
-        const versionedGlob = _.flatten(
-          include.map(pattern =>
+        const versionedGlob = include
+          .map(pattern =>
             versionsNames.map(versionName => `${versionName}/${pattern}`),
-          ),
-        );
+          )
+          .reduce((a, b) => a.concat(b), []);
         const versionedFiles = await globby(versionedGlob, {
           cwd: versionedDir,
         });
@@ -338,7 +340,7 @@ export default function pluginContentDocs(
       // If versioning is enabled, we cleverly chunk the generated routes
       // to be by version and pick only needed base metadata.
       if (versioning.enabled) {
-        const docsMetadataByVersion = _.groupBy(
+        const docsMetadataByVersion = groupBy(
           Object.values(content.docsMetadata),
           'version',
         );
@@ -358,13 +360,12 @@ export default function pluginContentDocs(
             const neededSidebars: Set<string> =
               content.versionToSidebars[version] || new Set();
             const docsBaseMetadata: DocsBaseMetadata = {
-              docsSidebars: _.pick(
+              docsSidebars: pick(
                 content.docsSidebars,
                 Array.from(neededSidebars),
               ),
-              permalinkToSidebar: _.pickBy(
-                content.permalinkToSidebar,
-                sidebar => neededSidebars.has(sidebar),
+              permalinkToSidebar: pickBy(content.permalinkToSidebar, sidebar =>
+                neededSidebars.has(sidebar),
               ),
               version,
             };

packages/docusaurus-plugin-content-docs/src/sidebars.ts

@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import _ from 'lodash';
+import flatMap from 'lodash.flatmap';
 import fs from 'fs-extra';
 import importFresh from 'import-fresh';
 import {
@@ -106,12 +106,12 @@ function normalizeItem(item: SidebarItemRaw): SidebarItem[] {
     ];
   }
   if (isCategoryShorthand(item)) {
-    return _.flatMap(normalizeCategoryShorthand(item), normalizeItem);
+    return flatMap(normalizeCategoryShorthand(item), normalizeItem);
   }
   switch (item.type) {
     case 'category':
       assertIsCategory(item);
-      return [{...item, items: _.flatMap(item.items, normalizeItem)}];
+      return [{...item, items: flatMap(item.items, normalizeItem)}];
     case 'link':
       assertIsLink(item);
       return [item];
@@ -134,7 +134,7 @@ function normalizeSidebar(sidebars: SidebarRaw): Sidebar {
         ? sidebar
         : normalizeCategoryShorthand(sidebar);
 
-      acc[sidebarId] = _.flatMap(normalizedSidebar, normalizeItem);
+      acc[sidebarId] = flatMap(normalizedSidebar, normalizeItem);
 
       return acc;
     },