chore: enable eslint for loopback-next monorepo

.eslintignore

@@ -0,0 +1,5 @@
+node_modules/
+dist/
+coverage/
+api-docs/
+/sandbox

.eslintrc.js

@@ -0,0 +1,3 @@
+module.exports = {
+  extends: ['./packages/eslint-config/eslintrc.js'],
+};

.travis.yml

@@ -27,7 +27,7 @@ matrix:
       env: TASK=code-lint
       # Running Code Linter -- Requires @loopback/build so it's bootstrapped
       script:
-        - lerna bootstrap --scope @loopback/build --scope @loopback/tslint-config
+        - lerna bootstrap --scope @loopback/build --scope @loopback/tslint-config --scope @loopback/eslint-config
         - npm run lint
     - node_js: "8"
       os: linux

bin/check-package-locks.js

@@ -15,6 +15,7 @@ const fs = require('fs');
 const promisify = require('util').promisify;
 
 const readFile = promisify(fs.readFile);
+const exists = promisify(fs.exists);
 
 const Project = require('@lerna/project');
 
@@ -58,6 +59,8 @@ if (require.main === module) {
 }
 
 async function checkLockFile(lockFile) {
+  const found = await exists(lockFile);
+  if (!found) return [];
   const data = JSON.parse(await readFile(lockFile, 'utf-8'));
   return Object.keys(data.dependencies || []).filter(dep =>
     dep.startsWith('@loopback/'),