Eslint/Updates (and drop Gulp)

.babelrc.json

@@ -0,0 +1,12 @@
+{
+  "presets": [
+    ["@babel/preset-env", {
+      "targets": {
+        "node": "4.0.0"
+      }
+    }]
+  ],
+  "plugins": [
+    ["transform-es2017-object-entries"]
+  ]
+}

.editorconfig

@@ -0,0 +1,18 @@
+# This file is for unifying the coding style for different editors and IDEs
+# editorconfig.org
+
+root = true
+
+[*]
+end_of_line = lf
+charset = utf-8
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 4
+
+[*.json]
+indent_size = 2
+
+[*.yml]
+indent_size = 2

.eslintignore

@@ -0,0 +1,8 @@
+node_modules
+lib
+
+!.eslintrc.js
+coverage
+
+# jsdoc
+out

.eslintrc.js

@@ -0,0 +1,46 @@
+'use strict';
+module.exports = {
+    extends: 'eslint:recommended',
+    globals: {
+        Atomics: 'readonly',
+        SharedArrayBuffer: 'readonly'
+    },
+    overrides: [{
+        files: '.eslintrc.js',
+        parserOptions: {
+            sourceType: 'script'
+        },
+        rules: {
+            strict: 'error'
+        }
+    }, {
+        files: 'test/**',
+        globals: {
+            expect: true
+        },
+        env: {
+            mocha: true
+        }
+    }],
+    rules: {
+        semi: ['error'],
+        indent: ['error', 4, { SwitchCase: 1 }],
+        'prefer-const': ['error'],
+        'no-var': ['error'],
+        'prefer-destructuring': ['error'],
+        'object-shorthand': ['error'],
+        'object-curly-spacing': ['error', 'always'],
+        quotes: ['error', 'single'],
+        'quote-props': ['error', 'as-needed'],
+        'brace-style': ['error', '1tbs', { allowSingleLine: true }],
+        'prefer-template': ['error']
+    },
+    env: {
+        node: true,
+        es6: true
+    },
+    parserOptions: {
+        sourceType: 'module',
+        ecmaVersion: 2018
+    },
+};

.gitignore

@@ -10,6 +10,7 @@ npm-debug.log
 # Cover
 .coverage_data/
 cover_html/
+coverage
 
 npm-debug.log
 .vimrc.local

.npmrc

@@ -0,0 +1 @@
+package-lock = false

.travis.yml

@@ -1,8 +1,6 @@
 sudo: false
 language: node_js
 node_js:
-  - "4"
-  - "6"
-  - "7"
-  - "8.0"
-  - "8.1"
+  - 10
+  - 12
+  - 14

README.md

@@ -7,28 +7,28 @@ scope analyzer extracted from [esmangle project](http://github.com/estools/esman
 ### Example
 
 ```js
-var escope = require('escope');
-var esprima = require('esprima');
-var estraverse = require('estraverse');
+const escope = require('escope');
+const esprima = require('esprima');
+const estraverse = require('estraverse');
 
-var ast = esprima.parse(code);
-var scopeManager = escope.analyze(ast);
+const ast = esprima.parse(code);
+const scopeManager = escope.analyze(ast);
 
-var currentScope = scopeManager.acquire(ast);   // global scope
+const currentScope = scopeManager.acquire(ast);   // global scope
 
 estraverse.traverse(ast, {
-    enter: function(node, parent) {
+    enter (node, parent) {
         // do stuff
-        
+
         if (/Function/.test(node.type)) {
             currentScope = scopeManager.acquire(node);  // get current function scope
         }
     },
-    leave: function(node, parent) {
+    leave (node, parent) {
         if (/Function/.test(node.type)) {
             currentScope = currentScope.upper;  // set to parent scope
         }
-        
+
         // do stuff
     }
 });