Add linting (#1053)

.eslintrc.js

@@ -0,0 +1,28 @@
+module.exports = {
+  parserOptions: {
+    ecmaVersion: 2015,
+  },
+  extends: [
+    'eslint:recommended',
+    'prettier',
+  ],
+  plugins: [],
+  rules: {
+    'no-console': 0,
+    'no-octal': 0,
+    'no-var': 2,
+    'no-empty': 0,
+    'no-debugger': 2,
+    'prefer-const': 2,
+    'no-fallthrough': 2,
+    'require-atomic-updates': 0,
+    'no-useless-escape': 0,
+    'no-unused-vars': 0,
+    "no-var": 0 // ToDo
+  },
+  env: {
+    node: true,
+    mocha: true,
+    es6: true,
+  },
+};

.prettierrc

@@ -0,0 +1,6 @@
+{
+  "singleQuote": true,
+  "trailingComma": "es5",
+  "arrowParens": "always",
+  "endOfLine": "lf"
+}

lib/forever.js

@@ -623,8 +623,8 @@ forever.tail = function (target, options, callback) {
     tail.stdio[1].on('data', function (data) {
       var chunk = data.split('\n\n');
       chunk.forEach(function (logs) {
-        var logs = logs.split('\n').filter(blanks),
-            file = logs.filter(title),
+        var filteredLogs = logs.split('\n').filter(blanks),
+            file = filteredLogs.filter(title),
             lines,
             proc;
 
@@ -633,8 +633,8 @@ forever.tail = function (target, options, callback) {
           : map[procs[0].logFile];
 
         lines = count !== 1
-          ? logs.slice(1)
-          : logs;
+          ? filteredLogs.slice(1)
+          : filteredLogs;
 
         lines.forEach(function (line) {
           callback(null, { file: proc.file, pid: proc.pid, line: line });