Implement recursive plugin discovery

package.json

@@ -361,6 +361,7 @@
     "@types/markdown-it": "^0.0.7",
     "@types/minimatch": "^2.0.29",
     "@types/mocha": "^7.0.2",
+    "@types/mock-fs": "^4.10.0",
     "@types/moment-timezone": "^0.5.12",
     "@types/mustache": "^0.8.31",
     "@types/node": ">=10.17.17 <10.20.0",
@@ -473,6 +474,7 @@
     "listr": "^0.14.1",
     "load-grunt-config": "^3.0.1",
     "mocha": "^7.1.1",
+    "mock-fs": "^4.12.0",
     "mock-http-server": "1.3.0",
     "ms-chromium-edge-driver": "^0.2.3",
     "multistream": "^2.1.1",

packages/kbn-optimizer/src/optimizer/kibana_platform_plugins.test.ts

@@ -41,18 +41,18 @@ it('parses kibana.json files of plugins found in pluginDirs', () => {
         "id": "bar",
         "isUiPlugin": true,
       },
-      Object {
-        "directory": <absolute path>/packages/kbn-optimizer/src/__fixtures__/mock_repo/plugins/baz,
-        "extraPublicDirs": Array [],
-        "id": "baz",
-        "isUiPlugin": false,
-      },
       Object {
         "directory": <absolute path>/packages/kbn-optimizer/src/__fixtures__/mock_repo/plugins/foo,
         "extraPublicDirs": Array [],
         "id": "foo",
         "isUiPlugin": true,
       },
+      Object {
+        "directory": <absolute path>/packages/kbn-optimizer/src/__fixtures__/mock_repo/plugins/nested/baz,
+        "extraPublicDirs": Array [],
+        "id": "baz",
+        "isUiPlugin": false,
+      },
       Object {
         "directory": <absolute path>/packages/kbn-optimizer/src/__fixtures__/mock_repo/test_plugins/test_baz,
         "extraPublicDirs": Array [],

packages/kbn-optimizer/src/optimizer/kibana_platform_plugins.ts

@@ -37,7 +37,7 @@ export function findKibanaPlatformPlugins(scanDirs: string[], paths: string[]) {
     .sync(
       Array.from(
         new Set([
-          ...scanDirs.map((dir) => `${dir}/*/kibana.json`),
+          ...scanDirs.map(nestedScanDirPaths).reduce((dirs, current) => [...dirs, ...current], []),
           ...paths.map((path) => `${path}/kibana.json`),
         ])
       ),
@@ -51,6 +51,17 @@ export function findKibanaPlatformPlugins(scanDirs: string[], paths: string[]) {
     );
 }
 
+function nestedScanDirPaths(dir: string): string[] {
+  // down to 5 level max
+  return [
+    `${dir}/*/kibana.json`,
+    `${dir}/*/*/kibana.json`,
+    `${dir}/*/*/*/kibana.json`,
+    `${dir}/*/*/*/*/kibana.json`,
+    `${dir}/*/*/*/*/*/kibana.json`,
+  ];
+}
+
 function readKibanaPlatformPlugin(manifestPath: string): KibanaPlatformPlugin {
   if (!Path.isAbsolute(manifestPath)) {
     throw new TypeError('expected new platform manifest path to be absolute');

renovate.json5

@@ -636,6 +636,14 @@
           '(\\b|_)mocha(\\b|_)',
         ],
       },
+      {
+        groupSlug: 'mock-fs',
+        groupName: 'mock-fs related packages',
+        packageNames: [
+          'mock-fs',
+          '@types/mock-fs',
+        ],
+      },
       {
         groupSlug: 'moment',
         groupName: 'moment related packages',

src/core/server/plugins/discovery/plugins_discovery.test.mocks.ts

@@ -17,14 +17,5 @@
  * under the License.
  */
 
-export const mockReaddir = jest.fn();
-export const mockReadFile = jest.fn();
-export const mockStat = jest.fn();
-jest.mock('fs', () => ({
-  readdir: mockReaddir,
-  readFile: mockReadFile,
-  stat: mockStat,
-}));
-
 export const mockPackage = new Proxy({ raw: {} as any }, { get: (obj, prop) => obj.raw[prop] });
 jest.mock('../../../../../package.json', () => mockPackage);