Log warnings to the console

public/popup.html

@@ -154,15 +154,23 @@ <h1 class="title">Hotwire Dev Tools</h1>
     <fieldset>
       <legend>Console Log</legend>
       <form>
+        <label class="toggle">
+          <input class="toggle-checkbox" type="checkbox" id="log-warnings" />
+          <div class="toggle-switch"></div>
+          <span class="toggle-label">Log Warnings</span>
+        </label>
+
         <label class="toggle">
           <input class="toggle-checkbox" type="checkbox" id="monitor-events" />
           <div class="toggle-switch"></div>
           <span class="toggle-label">Monitor Events</span>
         </label>
-        <div class="detail-panel-options-control monitor-events-toggle-element">
-          <button id="monitor-events-select-all">Select all</button>
+        <div class="monitor-events-collapse">
+          <div class="detail-panel-options-control monitor-events-toggle-element">
+            <button id="monitor-events-select-all">Select all</button>
+          </div>
+          <div class="detail-panel-options-wrapper monitor-events-toggle-element monitor-events-checkbox-container"></div>
         </div>
-        <div class="detail-panel-options-wrapper monitor-events-toggle-element monitor-events-checkbox-container"></div>
       </form>
     </fieldset>
   </body>

public/styles/popup.css

@@ -32,6 +32,11 @@ label,
   user-select: none;
 }
 
+form {
+  display: flex;
+  flex-direction: column;
+}
+
 fieldset {
   margin: 1rem 0;
   border: 1px solid #ccc;

src/content.js

@@ -1,14 +1,17 @@
+import { debounce } from "./utils/utils"
 import { turboStreamTargetElements } from "./utils/turbo_utils"
 import { addHighlightOverlayToElements, removeHighlightOverlay } from "./utils/highlight"
 import { MONITORING_EVENTS } from "./lib/monitoring_events"
 
 import Devtool from "./lib/devtool"
 import DetailPanel from "./components/detail_panel"
 import DOMScanner from "./utils/dom_scanner"
+import DiagnosticsChecker from "./lib/diagnostics_checker"
 
 const LOCATION_ORIGIN = window.location.origin
 const devTool = new Devtool(LOCATION_ORIGIN)
 const detailPanel = new DetailPanel(devTool)
+const diagnosticsChecker = new DiagnosticsChecker(devTool)
 
 const highlightTurboFrames = () => {
   const badgeClass = "hotwire-dev-tools-turbo-frame-info-badge"
@@ -137,7 +140,7 @@ const highlightStimulusControllers = () => {
 
 const injectCustomScript = () => {
   const existingScript = document.getElementById("hotwire-dev-tools-inject-script")
-  if (existingScript || !devTool.shouldRenderDetailPanel()) return
+  if (existingScript) return
 
   const script = document.createElement("script")
   script.src = chrome.runtime.getURL("dist/hotwire_dev_tools_inject_script.js")
@@ -165,6 +168,12 @@ const consoleLogTurboStream = (event) => {
   console.log(message, turboStream)
 }
 
+const checkForWarnings = debounce(() => {
+  if (devTool.options.logWarnings) {
+    diagnosticsChecker.checkForWarnings()
+  }
+}, 150)
+
 const handleTurboFrameBadgeClick = (event) => {
   navigator.clipboard.writeText(event.target.dataset.turboId).then(() => {
     event.target.classList.add("copied")
@@ -189,6 +198,7 @@ const handleWindowMessage = (event) => {
       if (event.data.registeredControllers) {
         devTool.registeredStimulusControllers = event.data.registeredControllers
         renderDetailPanel()
+        checkForWarnings()
       }
       break
     case "turboDetails":
@@ -257,7 +267,7 @@ const init = async () => {
   highlightTurboFrames()
   highlightStimulusControllers()
   renderDetailPanel()
-  console.log(DOMScanner.uniqueStimulusControllerIdentifiers)
+  checkForWarnings()
 }
 
 const events = ["turbolinks:load", "turbo:load", "turbo:frame-load", "hotwire-dev-tools:options-changed"]

src/lib/devtool.js

@@ -139,6 +139,7 @@ export default class Devtool {
       monitor: {
         events: [],
       },
+      logWarnings: true,
     }
   }
 }

src/lib/diagnostics_checker.js

@@ -0,0 +1,78 @@
+import DOMScanner from "../utils/dom_scanner"
+
+export default class DiagnosticsChecker {
+  constructor(devTool) {
+    this.devTool = devTool
+    this.printedWarnings = []
+    this.logger = console
+  }
+
+  printWarning = (message, once = true, ...extraArgs) => {
+    if (once && this.printedWarnings.includes(message)) return
+
+    this.logger.warn(`Hotwire Dev Tools: ${message}`, ...extraArgs)
+    this.printedWarnings.push(message)
+  }
+
+  checkForWarnings = () => {
+    this._checkForDuplicatedTurboFrames()
+    this._checkForNonRegisteredStimulusControllers()
+    this._checkTurboPermanentElements()
+    this._checkStimulusTargetsNesting()
+  }
+
+  _checkForDuplicatedTurboFrames = () => {
+    const turboFramesIds = DOMScanner.turboFrameIds
+    const duplicatedIds = turboFramesIds.filter((id, index) => turboFramesIds.indexOf(id) !== index)
+
+    duplicatedIds.forEach((id) => {
+      this.printWarning(`Multiple Turbo Frames with the same ID '${id}' detected. This can cause unexpected behavior. Ensure that each Turbo Frame has a unique ID.`)
+    })
+  }
+
+  _checkForNonRegisteredStimulusControllers = () => {
+    const registeredStimulusControllers = this.devTool.registeredStimulusControllers
+    if (registeredStimulusControllers.length === 0) return
+
+    DOMScanner.uniqueStimulusControllerIdentifiers.forEach((controllerId) => {
+      const controllerRegistered = registeredStimulusControllers.includes(controllerId)
+
+      if (!controllerRegistered) {
+        this.printWarning(`The Stimulus controller '${controllerId}' does not appear to be registered. Learn more about registering Stimulus controllers here: https://stimulus.hotwired.dev/handbook/installing.`)
+      }
+    })
+  }
+
+  _checkStimulusTargetsNesting = () => {
+    DOMScanner.uniqueStimulusControllerIdentifiers.forEach((controllerId) => {
+      const dataSelector = `data-${controllerId}-target`
+      const targetElements = document.querySelectorAll(`[${dataSelector}`)
+      targetElements.forEach((element) => {
+        const parent = element.closest(`[data-controller="${controllerId}"]`)
+        if (!parent) {
+          const targetName = element.getAttribute(`${dataSelector}`)
+          this.printWarning(`The Stimulus target '${targetName}' is not inside the Stimulus controller '${controllerId}'`)
+        }
+      })
+    })
+  }
+
+  _checkTurboPermanentElements = () => {
+    const turboPermanentElements = DOMScanner.turboPermanentElements
+    if (turboPermanentElements.length === 0) return
+
+    turboPermanentElements.forEach((element) => {
+      const id = element.id
+      if (id === "") {
+        const message = `Hotwire Dev Tools: Turbo Permanent Element detected without an ID. Turbo Permanent Elements must have a unique ID to work correctly.`
+        this.printWarning(message, true, element)
+      }
+
+      const idIsDuplicated = id && document.querySelectorAll(`#${id}`).length > 1
+      if (idIsDuplicated) {
+        const message = `Hotwire Dev Tools: Turbo Permanent Element with ID '${id}' doesn't have a unique ID. Turbo Permanent Elements must have a unique ID to work correctly.`
+        this.printWarning(message, true, element)
+      }
+    })
+  }
+}

src/popup.js

@@ -36,6 +36,8 @@ const monitorEventsToggles = document.querySelectorAll(".monitor-events-toggle-e
 const monitorEventsCheckboxContainer = document.querySelector(".monitor-events-checkbox-container")
 const monitorEventsSelectAll = document.getElementById("monitor-events-select-all")
 
+const logWarning = document.getElementById("log-warnings")
+
 const toggleInputs = (toggleElements, show) => {
   toggleElements.forEach((element) => {
     element.classList.toggle("d-none", !show)
@@ -81,6 +83,8 @@ const initializeForm = async (options) => {
 
   monitorEvents.checked = options.monitor.events.length > 0
 
+  logWarning.checked = options.logWarnings
+
   if (devTool.isFirefox) {
     // In Firefox the color picker inside an extension popup doesn't really work (See https://github.com/leonvogt/hotwire-dev-tools/issues/20)
     // Workaround: Change the input type to text so the user can input the color manually
@@ -285,6 +289,11 @@ const setupEventListeners = (options) => {
     options.monitor.events = allChecked ? [] : MONITORING_EVENTS
     saveOptions(options)
   })
+
+  logWarning.addEventListener("change", (event) => {
+    options.logWarnings = event.target.checked
+    saveOptions(options)
+  })
 }
 
 const getCurrentTabOrigin = async () => {

src/utils/dom_scanner.js

@@ -7,6 +7,14 @@ export default class DOMScanner {
     return document.querySelectorAll("turbo-frame")
   }
 
+  static get turboFrameIds() {
+    return Array.from(this.turboFrameElements).map((turboFrame) => turboFrame.id)
+  }
+
+  static get turboPermanentElements() {
+    return document.querySelectorAll("[data-turbo-permanent]")
+  }
+
   // Stimulus
   static get stimulusControllerElements() {
     return document.querySelectorAll("[data-controller]")