Feature Implemented: Warning displayed when frontend version mismatches (#4363)

Co-authored-by: bymyself <cbyrne@comfy.org>
Co-authored-by: Claude <noreply@anthropic.com>

src/composables/useFrontendVersionMismatchWarning.ts

@@ -0,0 +1,94 @@
+import { whenever } from '@vueuse/core'
+import { computed, onMounted } from 'vue'
+import { useI18n } from 'vue-i18n'
+
+import { useToastStore } from '@/stores/toastStore'
+import { useVersionCompatibilityStore } from '@/stores/versionCompatibilityStore'
+
+export interface UseFrontendVersionMismatchWarningOptions {
+  immediate?: boolean
+}
+
+/**
+ * Composable for handling frontend version mismatch warnings.
+ *
+ * Displays toast notifications when the frontend version is incompatible with the backend,
+ * either because the frontend is outdated or newer than the backend expects.
+ * Automatically dismisses warnings when shown and persists dismissal state for 7 days.
+ *
+ * @param options - Configuration options
+ * @param options.immediate - If true, automatically shows warning when version mismatch is detected
+ * @returns Object with methods and computed properties for managing version warnings
+ *
+ * @example
+ * ```ts
+ * // Show warning immediately when mismatch detected
+ * const { showWarning, shouldShowWarning } = useFrontendVersionMismatchWarning({ immediate: true })
+ *
+ * // Manual control
+ * const { showWarning } = useFrontendVersionMismatchWarning()
+ * showWarning() // Call when needed
+ * ```
+ */
+export function useFrontendVersionMismatchWarning(
+  options: UseFrontendVersionMismatchWarningOptions = {}
+) {
+  const { immediate = false } = options
+  const { t } = useI18n()
+  const toastStore = useToastStore()
+  const versionCompatibilityStore = useVersionCompatibilityStore()
+
+  // Track if we've already shown the warning
+  let hasShownWarning = false
+
+  const showWarning = () => {
+    // Prevent showing the warning multiple times
+    if (hasShownWarning) return
+
+    const message = versionCompatibilityStore.warningMessage
+    if (!message) return
+
+    const detailMessage = t('g.frontendOutdated', {
+      frontendVersion: message.frontendVersion,
+      requiredVersion: message.requiredVersion
+    })
+
+    const fullMessage = t('g.versionMismatchWarningMessage', {
+      warning: t('g.versionMismatchWarning'),
+      detail: detailMessage
+    })
+
+    toastStore.addAlert(fullMessage)
+    hasShownWarning = true
+
+    // Automatically dismiss the warning so it won't show again for 7 days
+    versionCompatibilityStore.dismissWarning()
+  }
+
+  onMounted(() => {
+    // Only set up the watcher if immediate is true
+    if (immediate) {
+      whenever(
+        () => versionCompatibilityStore.shouldShowWarning,
+        () => {
+          showWarning()
+        },
+        {
+          immediate: true,
+          once: true
+        }
+      )
+    }
+  })
+
+  return {
+    showWarning,
+    shouldShowWarning: computed(
+      () => versionCompatibilityStore.shouldShowWarning
+    ),
+    dismissWarning: versionCompatibilityStore.dismissWarning,
+    hasVersionMismatch: computed(
+      () => versionCompatibilityStore.hasVersionMismatch
+    )
+  }
+}