feat(build): add eslint scripts and default configs

See https://github.com/typescript-eslint/typescript-eslint

CODEOWNERS

@@ -15,6 +15,7 @@ packages/http-server/* @hacksparrow @bajtos
 packages/cli/* @raymondfeng @bajtos
 packages/context/* @bajtos @raymondfeng
 packages/core/* @bajtos @raymondfeng
+packages/eslint-config/* @raymondfeng
 packages/metadata/* @raymondfeng
 packages/openapi-spec-builder/* @bajtos @raymondfeng
 packages/openapi-v3/* @bajtos @jannyHou

docs/site/MONOREPO.md

@@ -15,6 +15,7 @@ The [loopback-next](https://github.com/strongloop/loopback-next) repository uses
 | [context](https://github.com/strongloop/loopback-next/tree/master/packages/context)                                 | @loopback/context                     | Facilities to manage artifacts and their dependencies in your Node.js applications. The module exposes TypeScript/JavaScript APIs and decorators to register artifacts, declare dependencies, and resolve artifacts by keys. It also serves as an IoC container to support dependency injection. |
 | [core](https://github.com/strongloop/loopback-next/tree/master/packages/core)                                       | @loopback/core                        | Define and implement core constructs such as Application and Component                                                                                                                                                                                                                           |
 | [docs](https://github.com/strongloop/loopback-next/tree/master/docs)                                                | @loopback/docs                        | Documentation files rendered at [https://loopback.io](https://loopback.io)                                                                                                                                                                                                                       |
+| [eslint-config](https://github.com/strongloop/loopback-next/tree/master/packages/eslint-config)                     | @loopback/eslint-config               | ESLint configuration for LoopBack projects                                                                                                                                                                                                                                                       |
 | [example-express-composition](https://github.com/strongloop/loopback-next/tree/master/examples/express-composition) | @loopback/example-express-composition | A simple Express application that uses LoopBack 4 REST API                                                                                                                                                                                                                                       |
 | [example-greeter-extension](https://github.com/strongloop/loopback-next/tree/master/examples/greeter-extension)     | @loopback/example-greeter-extension   | An example showing how to implement the extension point/extension pattern using LoopBack 4                                                                                                                                                                                                       |
 | [example-hello-world](https://github.com/strongloop/loopback-next/tree/master/examples/hello-world)                 | @loopback/example-hello-world         | A simple hello-world application using LoopBack 4                                                                                                                                                                                                                                                |

greenkeeper.json

@@ -21,6 +21,7 @@
         "packages/cli/package.json",
         "packages/context/package.json",
         "packages/core/package.json",
+        "packages/eslint-config/package.json",
         "packages/http-caching-proxy/package.json",
         "packages/http-server/package.json",
         "packages/metadata/package.json",

packages/build/bin/run-eslint.js

@@ -0,0 +1,49 @@
+#!/usr/bin/env node
+// Copyright IBM Corp. 2017,2018. All Rights Reserved.
+// Node module: @loopback/build
+// This file is licensed under the MIT License.
+// License text available at https://opensource.org/licenses/MIT
+
+/*
+========
+
+Usage:
+  node ./bin/run-eslint
+
+========
+*/
+
+'use strict';
+
+function run(argv, options) {
+  const utils = require('./utils');
+
+  const eslintOpts = argv.slice(2);
+
+  const isConfigSet = utils.isOptionSet(eslintOpts, '-c', '--config');
+  const isExtSet = utils.isOptionSet(eslintOpts, '--ext');
+
+  const eslintConfigFile = isConfigSet
+    ? null
+    : utils.getConfigFile('.eslintrc.js', '.eslintrc.json');
+
+  const eslintIgnoreFile = utils.getConfigFile('.eslintignore');
+
+  const args = [];
+  if (eslintConfigFile) {
+    args.push('-c', eslintConfigFile);
+  }
+  if (eslintIgnoreFile) {
+    args.push('--ignore-path', eslintIgnoreFile);
+  }
+
+  if (!isExtSet) {
+    args.push('--ext', '.js,.ts');
+  }
+  args.push(...eslintOpts);
+
+  return utils.runCLI('eslint/bin/eslint', args, options);
+}
+
+module.exports = run;
+if (require.main === module) run(process.argv);

packages/build/config/.eslintignore

@@ -0,0 +1,4 @@
+node_modules/
+dist/
+coverage/
+api-docs/

packages/build/config/.eslintrc.js

@@ -0,0 +1,3 @@
+module.exports = {
+  extends: '@loopback/eslint-config',
+};