eslint cleanup after mjs switch

Author: netbymatt

.eslintrc

@@ -0,0 +1,91 @@
+{
+	"env": {
+		"browser": true,
+		"es6": true,
+		"node": true,
+		"jquery": true
+	},
+	"extends": [
+		"airbnb-base"
+	],
+	"globals": {
+		"TravelCities": "readonly",
+		"RegionalCities": "readonly",
+		"StationInfo": "readonly",
+		"SunCalc": "readonly"
+	},
+	"parserOptions": {
+		"ecmaVersion": 2023,
+		"sourceType": "module"
+	},
+	"plugins": [],
+	"rules": {
+		"indent": [
+			"error",
+			"tab",
+			{
+				"SwitchCase": 1
+			}
+		],
+		"no-tabs": 0,
+		"no-console": 0,
+		"max-len": 0,
+		"no-use-before-define": [
+			"error",
+			{
+				"variables": false
+			}
+		],
+		"no-param-reassign": [
+			"error",
+			{
+				"props": false
+			}
+		],
+		"no-mixed-operators": [
+			"error",
+			{
+				"groups": [
+					[
+						"&",
+						"|",
+						"^",
+						"~",
+						"<<",
+						">>",
+						">>>"
+					],
+					[
+						"==",
+						"!=",
+						"===",
+						"!==",
+						">",
+						">=",
+						"<",
+						"<="
+					],
+					[
+						"&&",
+						"||"
+					],
+					[
+						"in",
+						"instanceof"
+					]
+				],
+				"allowSamePrecedence": true
+			}
+		],
+		"import/extensions": [
+			"error",
+			{
+				"mjs": "always",
+				"json": "always"
+			}
+		]
+	},
+	"ignorePatterns": [
+		"*.min.js"
+	]
+}