implement basic linting with eslint,

fix linting errors in testenv module

Signed-off-by: Arthur Lu <learthurgo@gmail.com>

.eslintrc.json

@@ -0,0 +1,33 @@
+{
+    "env": {
+        "browser": true,
+        "es2021": true,
+        "node": true
+    },
+    "extends": "eslint:recommended",
+    "overrides": [
+    ],
+    "parserOptions": {
+        "ecmaVersion": "latest",
+        "sourceType": "module"
+    },
+    "rules": {
+        "indent": [
+            "error",
+            "tab"
+        ],
+        "linebreak-style": [
+            "error",
+            "unix"
+        ],
+        "quotes": [
+            "error",
+            "double"
+        ],
+        "semi": [
+            "error",
+            "always"
+        ],
+        "no-global-assign": 0
+    }
+}

package.json

@@ -2,9 +2,16 @@
   "name": "food-journal",
   "version": "1.0.0",
   "scripts": {
-    "test": "mocha --recursive **/*.test.js"
+    "test": "mocha --recursive **/*.test.js",
+    "lint": "eslint **/*.js",
+    "fix-style": "eslint --fix **/*.js"
   },
-  "dependencies": {
+  "devDependencies": {
+    "eslint": "^8.27.0",
+    "eslint-config-standard": "^17.0.0",
+    "eslint-plugin-import": "^2.26.0",
+    "eslint-plugin-n": "^15.5.0",
+    "eslint-plugin-promise": "^6.1.1",
     "mocha": "10"
   }
 }

testenv/testenv.test.js

@@ -1,6 +1,7 @@
 const {environment} = require("./testenv.js");
-var assert = require('assert');
+var assert = require("assert");
-var {saveToLocal, getFromLocal, removeFromLocal, clearLocal} = require('./testenv_helpers');
+var {describe, it, beforeEach} = require("mocha");
+var {saveToLocal, getFromLocal, removeFromLocal, clearLocal} = require("./testenv_helpers");
 
 beforeEach(() => {
 	window = environment();