add eslint and console api

Author: devsnek

.eslintignore

@@ -0,0 +1 @@
+!.eslintrc.js

.eslintrc.js

@@ -0,0 +1,39 @@
+'use strict';
+
+module.exports = {
+  extends: 'airbnb-base',
+  parser: 'babel-eslint',
+  parserOptions: {
+    ecmaVersion: 2019,
+  },
+  env: {
+    browser: true,
+  },
+  overrides: [
+    {
+      files: ['*.js', '.*.js'],
+      parserOptions: { sourceType: 'script' },
+    },
+  ],
+  globals: {
+    BigInt: false,
+    Atomics: false,
+    SharedArrayBuffer: false,
+    WeakRef: false,
+  },
+  rules: {
+    'quote-props': ['error', 'consistent'],
+    'strict': ['error', 'global'],
+    'prefer-destructuring': 'off',
+    'no-multiple-empty-lines': ['error', { maxBOF: 0, max: 2 }],
+    'arrow-parens': ['error', 'always'],
+    'lines-between-class-members': 'off',
+    'max-classes-per-file': 'off',
+    'no-restricted-syntax': 'off',
+    'import/no-cycle': 'off',
+    'import/extensions': 'off',
+    'import/prefer-default-export': 'off',
+    'import/no-mutable-exports': 'off',
+    'global-require': 'off',
+  },
+};

api/.eslintrc.js

@@ -0,0 +1,8 @@
+'use strict';
+
+module.exports = {
+  extends: '../.eslintrc.js',
+  env: {
+    node: true,
+  },
+};

src/editor.mjs

@@ -1,4 +1,3 @@
-/* eslint-env browser */
 /* global CodeMirror */
 
 import { getState, setState } from './state.mjs';

src/index.mjs

@@ -1,5 +1,3 @@
-/* eslint-env browser */
-
 import './state.mjs';
 import './editor.mjs';
 

src/runner.mjs

@@ -1,5 +1,3 @@
-/* eslint-env browser */
-
 import { getState, updateState } from './state.mjs';
 
 const features = document.querySelector('#features');

src/state.mjs

@@ -1,4 +1,3 @@
-/* eslint-env browser */
 /* global LZString */
 
 const query = new URLSearchParams(document.location.hash.slice(1));

src/worker.js

@@ -14,6 +14,7 @@ const {
   Value,
   Throw,
   inspect,
+  Object: APIObject,
   FEATURES,
 } = self.engine262;
 
@@ -46,6 +47,29 @@ addEventListener('message', ({ data }) => {
     }, [], realm);
     Abstract.CreateDataProperty(realm.global, new Value(realm, 'print'), print);
 
+    const console = new APIObject(realm);
+    Abstract.CreateDataProperty(realm.global, new Value(realm, 'console'), console);
+
+    [
+      'log',
+      'warn',
+      'debug',
+      'error',
+      'clear',
+    ].forEach((method) => {
+      const fn = new Value(realm, (args) => {
+        postMessage({
+          type: 'console',
+          value: {
+            method,
+            values: args.map((a) => inspect(a)),
+          },
+        });
+        return Value.undefined;
+      });
+      Abstract.CreateDataProperty(console, new Value(realm, method), fn);
+    });
+
     postMessage({
       type: 'console',
       value: {