cli: add and use app:lint + include default eslint config in cli

packages/cli/src/commands/app/lint.ts

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2020 Spotify AB
+ *
+ * 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 { run } from '../../helpers/run';
+
+export default async (cmd: Command) => {
+  const args = ['lint'];
+  if (cmd.fix) {
+    args.push('--fix');
+  }
+
+  await run('web-scripts', args);
+};

packages/cli/src/index.ts

@@ -19,6 +19,7 @@ import chalk from 'chalk';
 import fs from 'fs';
 import createPluginCommand from './commands/createPlugin';
 import watch from './commands/watch-deps';
+import appLint from './commands/app/lint';
 import pluginBuild from './commands/plugin/build';
 import pluginLint from './commands/plugin/lint';
 import pluginServe from './commands/plugin/serve';
@@ -30,6 +31,12 @@ const main = (argv: string[]) => {
 
   program.name('backstage-cli').version(packageJson.version ?? '0.0.0');
 
+  program
+    .command('app:lint')
+    .option('--fix', 'Attempt to automatically fix violations')
+    .description('Lint an app')
+    .action(actionHandler(appLint));
+
   program
     .command('create-plugin')
     .description('Creates a new plugin in the current repository')