Switch to ESLint flat config

.prettierignore

@@ -0,0 +1,2 @@
+*.js
+*.mjs

MMM-JsonTable.js

@@ -17,24 +17,24 @@ Module.register("MMM-JsonTable", {
     descriptiveRow: null
   },
 
-  start() {
+  start () {
     this.getJson();
     this.scheduleUpdate();
   },
 
-  scheduleUpdate() {
+  scheduleUpdate () {
     const self = this;
     setInterval(() => {
       self.getJson();
     }, this.config.updateInterval);
   },
 
   // Request node_helper to get json from url
-  getJson() {
+  getJson () {
     this.sendSocketNotification("MMM-JsonTable_GET_JSON", this.config.url);
   },
 
-  socketNotificationReceived(notification, payload) {
+  socketNotificationReceived (notification, payload) {
     if (notification === "MMM-JsonTable_JSON_RESULT") {
       // Only continue if the notification came from the request we made
       // This way we can load the module more than once
@@ -46,7 +46,7 @@ Module.register("MMM-JsonTable", {
   },
 
   // Override dom generator.
-  getDom() {
+  getDom () {
     const wrapper = document.createElement("div");
     wrapper.className = "xsmall";
 
@@ -87,7 +87,7 @@ Module.register("MMM-JsonTable", {
     return wrapper;
   },
 
-  getTableRow(jsonObject) {
+  getTableRow (jsonObject) {
     const row = document.createElement("tr");
     Object.entries(jsonObject).forEach(([key, value]) => {
       const cell = document.createElement("td");
@@ -107,9 +107,9 @@ Module.register("MMM-JsonTable", {
       const cellText = document.createTextNode(valueToDisplay);
 
       if (this.config.size > 0 && this.config.size < 9) {
-        const h = document.createElement(`H${this.config.size}`);
-        h.appendChild(cellText);
-        cell.appendChild(h);
+        const heading = document.createElement(`H${this.config.size}`);
+        heading.appendChild(cellText);
+        cell.appendChild(heading);
       } else {
         cell.appendChild(cellText);
       }
@@ -120,19 +120,19 @@ Module.register("MMM-JsonTable", {
   },
 
   // Format a date string or return the input
-  getFormattedValue(input) {
-    const m = moment(input);
-    if (typeof input === "string" && m.isValid()) {
+  getFormattedValue (input) {
+    const momentObj = moment(input);
+    if (typeof input === "string" && momentObj.isValid()) {
       // Show a formatted time if it occures today
       if (
-        m.isSame(new Date(Date.now()), "day") &&
-        m.hours() !== 0 &&
-        m.minutes() !== 0 &&
-        m.seconds() !== 0
+        momentObj.isSame(new Date(Date.now()), "day") &&
+        momentObj.hours() !== 0 &&
+        momentObj.minutes() !== 0 &&
+        momentObj.seconds() !== 0
       ) {
-        return m.format("HH:mm:ss");
+        return momentObj.format("HH:mm:ss");
       }
-      return m.format("YYYY-MM-DD");
+      return momentObj.format("YYYY-MM-DD");
     }
     return input;
   }

eslint.config.mjs

@@ -0,0 +1,42 @@
+import eslintPluginImport from "eslint-plugin-import";
+import eslintPluginJs from "@eslint/js";
+import eslintPluginJsonc from "eslint-plugin-jsonc";
+import eslintPluginStylistic from "@stylistic/eslint-plugin";
+import globals from "globals";
+
+export default [
+  ...eslintPluginJsonc.configs["flat/recommended-with-json"],
+  {
+    files: ["**/*.js", "**/*.mjs"],
+    languageOptions: {
+      globals: {
+        ...globals.browser,
+        ...globals.nodeBuiltin,
+        ...globals.node
+      }
+    },
+    plugins: {
+      ...eslintPluginStylistic.configs["all-flat"].plugins,
+      import: eslintPluginImport
+    },
+    rules: {
+      ...eslintPluginJs.configs.all.rules,
+      ...eslintPluginImport.configs.recommended.rules,
+      ...eslintPluginStylistic.configs["all-flat"].rules,
+      "capitalized-comments": "off",
+      "consistent-this": "off",
+      "max-statements": ["error", 25],
+      "multiline-comment-style": "off",
+      "no-magic-numbers": "off",
+      "one-var": "off",
+      "sort-keys": "off",
+      "@stylistic/array-element-newline": ["error", "consistent"],
+      "@stylistic/dot-location": ["error", "property"],
+      "@stylistic/function-call-argument-newline": ["error", "consistent"],
+      "@stylistic/indent": ["error", 2],
+      "@stylistic/quote-props": ["error", "as-needed"],
+      "@stylistic/padded-blocks": ["error", "never"]
+    }
+  }
+];
+

node_helper.js

@@ -2,11 +2,11 @@ const NodeHelper = require("node_helper");
 const Log = require("logger");
 
 module.exports = NodeHelper.create({
-  start() {
+  start () {
     Log.log("MMM-JsonTable helper started...");
   },
 
-  getJson(url) {
+  getJson (url) {
     const self = this;
 
     fetch(url)
@@ -21,7 +21,7 @@ module.exports = NodeHelper.create({
   },
 
   // Subclass socketNotificationReceived received.
-  socketNotificationReceived(notification, url) {
+  socketNotificationReceived (notification, url) {
     if (notification === "MMM-JsonTable_GET_JSON") {
       this.getJson(url);
     }