feat(config/migration): migrate package.json config

lib/workers/repository/config-migration/branch/create.spec.ts

@@ -1,13 +1,14 @@
+import { codeBlock } from 'common-tags';
 import type { Indent } from 'detect-indent';
 import { Fixtures } from '../../../../../test/fixtures';
 import type { RenovateConfig } from '../../../../../test/util';
-import { partial } from '../../../../../test/util';
+import { fs, partial, scm } from '../../../../../test/util';
 import { getConfig } from '../../../../config/defaults';
-import { scm } from '../../../../modules/platform/scm';
 import { createConfigMigrationBranch } from './create';
 import { MigratedDataFactory } from './migrated-data';
 import type { MigratedData } from './migrated-data';
 
+jest.mock('../../../../util/fs');
 jest.mock('../../../../util/git');
 
 describe('workers/repository/config-migration/branch/create', () => {
@@ -79,6 +80,42 @@ describe('workers/repository/config-migration/branch/create', () => {
       });
     });
 
+    it('migrates renovate config in package.json', async () => {
+      fs.readLocalFile.mockResolvedValueOnce(codeBlock`
+        {
+          "dependencies": {
+            "xmldoc": "1.0.0"
+          },
+          "renovate": ${renovateConfig}
+        }
+      `);
+      scm.getFileList.mockResolvedValueOnce([]);
+      await createConfigMigrationBranch(config, {
+        ...migratedConfigData,
+        filename: 'package.json',
+      });
+      expect(scm.checkoutBranch).toHaveBeenCalledWith(config.defaultBranch);
+      expect(scm.commitAndPush).toHaveBeenCalledWith({
+        branchName: 'renovate/migrate-config',
+        baseBranch: 'dev',
+        files: [
+          {
+            type: 'addition',
+            path: 'renovate.json',
+            contents: renovateConfig,
+          },
+          {
+            type: 'addition',
+            path: 'package.json',
+            contents: '{"dependencies":{"xmldoc":"1.0.0"}}',
+          },
+        ],
+        message: 'Migrate config renovate.json',
+        platformCommit: 'auto',
+        force: true,
+      });
+    });
+
     describe('applies the commitMessagePrefix value', () => {
       it('to the default commit message', async () => {
         config.commitMessagePrefix = 'PREFIX:';

lib/workers/repository/config-migration/branch/create.ts

@@ -2,17 +2,23 @@ import { GlobalConfig } from '../../../../config/global';
 import type { RenovateConfig } from '../../../../config/types';
 import { logger } from '../../../../logger';
 import { scm } from '../../../../modules/platform/scm';
+import { parseJson } from '../../../../util/common';
+import { readLocalFile } from '../../../../util/fs';
+import type { FileChange } from '../../../../util/git/types';
 import { getMigrationBranchName } from '../common';
 import { ConfigMigrationCommitMessageFactory } from './commit-message';
-import { MigratedDataFactory } from './migrated-data';
+import { MigratedDataFactory, applyPrettierFormatting } from './migrated-data';
 import type { MigratedData } from './migrated-data';
 
 export async function createConfigMigrationBranch(
   config: Partial<RenovateConfig>,
   migratedConfigData: MigratedData,
 ): Promise<string | null> {
   logger.debug('createConfigMigrationBranch()');
-  const configFileName = migratedConfigData.filename;
+  const pJsonMigration = migratedConfigData.filename === 'package.json';
+  const configFileName = pJsonMigration
+    ? 'renovate.json'
+    : migratedConfigData.filename;
   logger.debug('Creating config migration branch');
 
   const commitMessageFactory = new ConfigMigrationCommitMessageFactory(
@@ -31,16 +37,40 @@ export async function createConfigMigrationBranch(
   await scm.checkoutBranch(config.defaultBranch!);
   const contents =
     await MigratedDataFactory.applyPrettierFormatting(migratedConfigData);
+
+  const files: FileChange[] = [
+    {
+      type: 'addition',
+      path: configFileName,
+      contents,
+    },
+  ];
+
+  if (pJsonMigration) {
+    const pJson = parseJson(
+      await readLocalFile('package.json', 'utf8'),
+      'package.json',
+    ) as any;
+    if (pJson?.renovate) {
+      delete pJson.renovate;
+    }
+    const pJsonContent = await applyPrettierFormatting(
+      'package.json',
+      JSON.stringify(pJson, undefined, migratedConfigData.indent.indent),
+      'json',
+      migratedConfigData.indent,
+    );
+    files.push({
+      type: 'addition',
+      path: 'package.json',
+      contents: pJsonContent,
+    });
+  }
+
   return scm.commitAndPush({
     baseBranch: config.baseBranch,
     branchName: getMigrationBranchName(config),
-    files: [
-      {
-        type: 'addition',
-        path: configFileName,
-        contents,
-      },
-    ],
+    files,
     message: commitMessage.toString(),
     platformCommit: config.platformCommit,
     force: true,

lib/workers/repository/config-migration/index.spec.ts

@@ -46,19 +46,6 @@ describe('workers/repository/config-migration/index', () => {
     expect(ensureConfigMigrationPr).toHaveBeenCalledTimes(0);
   });
 
-  it('skips pr creation if config found in package.json', async () => {
-    const branchList: string[] = [];
-    mockedFunction(MigratedDataFactory.getAsync).mockResolvedValue({
-      content,
-      indent: partial<Indent>(),
-      filename: 'package.json',
-    });
-    const res = await configMigration(config, branchList);
-    expect(res).toMatchObject({ result: 'no-migration' });
-    expect(checkConfigMigrationBranch).toHaveBeenCalledTimes(0);
-    expect(ensureConfigMigrationPr).toHaveBeenCalledTimes(0);
-  });
-
   it('creates migration pr if needed', async () => {
     const branchList: string[] = [];
     mockedFunction(checkConfigMigrationBranch).mockResolvedValue({

lib/workers/repository/config-migration/index.ts

@@ -27,14 +27,6 @@ export async function configMigration(
     return { result: 'no-migration' };
   }
 
-  if (migratedConfigData.filename === 'package.json') {
-    logger.debug(
-      ' Using package.json for Renovate config is deprecated - please use a dedicated configuration file instead. Skipping config migration.',
-    );
-    MigratedDataFactory.reset();
-    return { result: 'no-migration' };
-  }
-
   const res = await checkConfigMigrationBranch(config, migratedConfigData);
 
   // migration needed but not demanded by user