module: make lint into a separate module

Signed-off-by: aramissennyeydd <aramis.sennyey@doordash.com>

packages/cli/src/commands/index.ts

@@ -31,6 +31,10 @@ import {
   registerRepoCommands as registerRepoTestCommands,
   registerPackageCommands as registerPackageTestCommands,
 } from '../modules/test';
+import {
+  registerPackageCommands as registerPackageLintCommands,
+  registerRepoCommands as registerRepoLintCommands,
+} from '../modules/lint';
 
 export function registerRepoCommand(program: Command) {
   const command = program
@@ -39,33 +43,7 @@ export function registerRepoCommand(program: Command) {
 
   registerRepoBuildCommands(command);
   registerRepoTestCommands(command);
-
-  command
-    .command('lint')
-    .description('Lint all packages in the project')
-    .option(
-      '--format <format>',
-      'Lint report output format',
-      'eslint-formatter-friendly',
-    )
-    .option(
-      '--output-file <path>',
-      'Write the lint report to a file instead of stdout',
-    )
-    .option(
-      '--since <ref>',
-      'Only lint packages that changed since the specified ref',
-    )
-    .option(
-      '--successCache',
-      'Enable success caching, which skips running tests for unchanged packages that were successful in the previous run',
-    )
-    .option(
-      '--successCacheDir <path>',
-      'Set the success cache location, (default: node_modules/.cache/backstage-cli)',
-    )
-    .option('--fix', 'Attempt to automatically fix violations')
-    .action(lazy(() => import('./repo/lint'), 'command'));
+  registerRepoLintCommands(command);
 
   command
     .command('fix')
@@ -115,25 +93,7 @@ export function registerScriptCommand(program: Command) {
   registerPackageBuildCommands(command);
   registerPackageTestCommands(command);
 
-  command
-    .command('lint [directories...]')
-    .option(
-      '--format <format>',
-      'Lint report output format',
-      'eslint-formatter-friendly',
-    )
-    .option(
-      '--output-file <path>',
-      'Write the lint report to a file instead of stdout',
-    )
-    .option('--fix', 'Attempt to automatically fix violations')
-    .option(
-      '--max-warnings <number>',
-      'Fail if more than this number of warnings. -1 allows warnings. (default: -1)',
-    )
-    .description('Lint a package')
-    .action(lazy(() => import('./lint'), 'default'));
-
+  registerPackageLintCommands(command);
   command
     .command('clean')
     .description('Delete cache directories')

packages/cli/src/modules/lint/alpha.ts

@@ -0,0 +1,86 @@
+/*
+ * Copyright 2025 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import { createCliPlugin } from '../../wiring/factory';
+import { Command } from 'commander';
+import { lazy } from '../../lib/lazy';
+
+export default createCliPlugin({
+  pluginId: 'lint',
+  init: async reg => {
+    reg.addCommand({
+      path: ['package', 'lint'],
+      description: 'Lint a package',
+      execute: async ({ args }) => {
+        const command = new Command();
+        command.arguments('[directories...]');
+        command.option('--fix', 'Attempt to automatically fix violations');
+        command.option(
+          '--format <format>',
+          'Lint report output format',
+          'eslint-formatter-friendly',
+        );
+        command.option(
+          '--output-file <path>',
+          'Write the lint report to a file instead of stdout',
+        );
+        command.option(
+          '--max-warnings <number>',
+          'Fail if more than this number of warnings. -1 allows warnings. (default: 0)',
+        );
+        command.description('Lint a package');
+        command.action(
+          lazy(() => import('./commands/package/lint'), 'default'),
+        );
+
+        await command.parseAsync(args, { from: 'user' });
+      },
+    });
+
+    reg.addCommand({
+      path: ['repo', 'lint'],
+      description: 'Lint a repository',
+      execute: async ({ args }) => {
+        const command = new Command();
+        command.option('--fix', 'Attempt to automatically fix violations');
+        command.option(
+          '--format <format>',
+          'Lint report output format',
+          'eslint-formatter-friendly',
+        );
+        command.option(
+          '--output-file <path>',
+          'Write the lint report to a file instead of stdout',
+        );
+        command.option(
+          '--successCache',
+          'Enable success caching, which skips running tests for unchanged packages that were successful in the previous run',
+        );
+        command.option(
+          '--successCacheDir <path>',
+          'Set the success cache location, (default: node_modules/.cache/backstage-cli)',
+        );
+        command.option(
+          '--since <ref>',
+          'Only lint packages that changed since the specified ref',
+        );
+        command.description('Lint a repository');
+        command.action(lazy(() => import('./commands/repo/lint'), 'command'));
+
+        await command.parseAsync(args, { from: 'user' });
+      },
+    });
+  },
+});

packages/cli/src/modules/lint/commands/package/lint.ts

@@ -16,7 +16,7 @@
 
 import fs from 'fs-extra';
 import { OptionValues } from 'commander';
-import { paths } from '../lib/paths';
+import { paths } from '../../../../lib/paths';
 import { ESLint } from 'eslint';
 
 export default async (directories: string[], opts: OptionValues) => {

packages/cli/src/modules/lint/commands/repo/lint.ts

@@ -24,10 +24,10 @@ import {
   BackstagePackageJson,
   Lockfile,
 } from '@backstage/cli-node';
-import { paths } from '../../lib/paths';
-import { runWorkerQueueThreads } from '../../lib/parallel';
-import { createScriptOptionsParser } from './optionsParser';
-import { SuccessCache } from '../../lib/cache/SuccessCache';
+import { paths } from '../../../../lib/paths';
+import { runWorkerQueueThreads } from '../../../../lib/parallel';
+import { createScriptOptionsParser } from '../../../../commands/repo/optionsParser';
+import { SuccessCache } from '../../../../lib/cache/SuccessCache';
 
 function depCount(pkg: BackstagePackageJson) {
   const deps = pkg.dependencies ? Object.keys(pkg.dependencies).length : 0;

packages/cli/src/modules/lint/index.ts

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2025 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import { Command } from 'commander';
+import { lazy } from '../../lib/lazy';
+
+export function registerPackageCommands(command: Command) {
+  command
+    .command('lint [directories...]')
+    .option(
+      '--format <format>',
+      'Lint report output format',
+      'eslint-formatter-friendly',
+    )
+    .option(
+      '--output-file <path>',
+      'Write the lint report to a file instead of stdout',
+    )
+    .option('--fix', 'Attempt to automatically fix violations')
+    .option(
+      '--max-warnings <number>',
+      'Fail if more than this number of warnings. -1 allows warnings. (default: 0)',
+    )
+    .description('Lint a package')
+    .action(lazy(() => import('./commands/package/lint'), 'default'));
+}
+
+export function registerRepoCommands(command: Command) {
+  command
+    .command('lint')
+    .description('Lint all packages in the project')
+    .option(
+      '--format <format>',
+      'Lint report output format',
+      'eslint-formatter-friendly',
+    )
+    .option(
+      '--output-file <path>',
+      'Write the lint report to a file instead of stdout',
+    )
+    .option(
+      '--since <ref>',
+      'Only lint packages that changed since the specified ref',
+    )
+    .option(
+      '--successCache',
+      'Enable success caching, which skips running tests for unchanged packages that were successful in the previous run',
+    )
+    .option(
+      '--successCacheDir <path>',
+      'Set the success cache location, (default: node_modules/.cache/backstage-cli)',
+    )
+    .option('--fix', 'Attempt to automatically fix violations')
+    .action(lazy(() => import('./commands/repo/lint'), 'command'));
+}