[V0_FILE]typescriptreact:file="app/page.tsx" "use client" import { DynamicTimeline } from "@/components/dynamic-timeline" import { CanonicalStateProvider } from "@/components/canonical-state-provider" export default function Home() { return (

Canonical State & Timeline System

) } [V0_FILE]typescriptreact:file="components/canonical-state-provider.tsx" "use client" import type React from "react" import { createContext, useContext, useReducer, useCallback, useEffect } from "react" interface ComponentSnapshot { id: string type: string state: "streaming" | "hydrated" | "error" | "fallback" data?: any timestamp: number dependencies: string[] } interface CanonicalState { components: Map timeline: ComponentSnapshot[] streamingActive: boolean userState: "anonymous" | "loading" | "authenticated" | "error" fallbackData: Map } interface StateAction { type: "REGISTER_COMPONENT" | "UPDATE_COMPONENT" | "STREAM_START" | "STREAM_END" | "SET_USER_STATE" | "SET_FALLBACK" payload: any } const initialState: CanonicalState = { components: new Map(), timeline: [], streamingActive: false, userState: "anonymous", fallbackData: new Map(), } function canonicalStateReducer(state: CanonicalState, action: StateAction): CanonicalState { switch (action.type) { case "REGISTER_COMPONENT": { const component: ComponentSnapshot = { ...action.payload, state: state.streamingActive ? "streaming" : "hydrated", timestamp: Date.now(), } const newComponents = new Map(state.components) newComponents.set(component.id, component) return { ...state, components: newComponents, timeline: [...state.timeline, component], } } case "UPDATE_COMPONENT": { const { id, updates } = action.payload const existing = state.components.get(id) if (!existing) return state const updated = { ...existing, ...updates, timestamp: Date.now() } const newComponents = new Map(state.components) newComponents.set(id, updated) return { ...state, components: newComponents, timeline: state.timeline.map((item) => (item.id === id ? updated : item)), } } case "STREAM_START": return { ...state, streamingActive: true } case "STREAM_END": { const newComponents = new Map() state.components.forEach((component, id) => { if (component.state === "streaming") { newComponents.set(id, { ...component, state: "hydrated", timestamp: Date.now() }) } else { newComponents.set(id, component) } }) return { ...state, components: newComponents, streamingActive: false, } } case "SET_USER_STATE": return { ...state, userState: action.payload } case "SET_FALLBACK": { const newFallbackData = new Map(state.fallbackData) newFallbackData.set(action.payload.key, action.payload.value) return { ...state, fallbackData: newFallbackData } } default: return state } } const CanonicalStateContext = createContext<{ state: CanonicalState dispatch: React.Dispatch registerComponent: (component: Omit) => void updateComponent: (id: string, updates: Partial) => void startStream: () => void endStream: () => void getFallback: (key: string) => any } | null>(null) export function CanonicalStateProvider({ children }: { children: React.ReactNode }) { const [state, dispatch] = useReducer(canonicalStateReducer, initialState) const registerComponent = useCallback((component: Omit) => { dispatch({ type: "REGISTER_COMPONENT", payload: component }) }, []) const updateComponent = useCallback((id: string, updates: Partial) => { dispatch({ type: "UPDATE_COMPONENT", payload: { id, updates } }) }, []) const startStream = useCallback(() => { dispatch({ type: "STREAM_START", payload: null }) }, []) const endStream = useCallback(() => { dispatch({ type: "STREAM_END", payload: null }) }, []) const getFallback = useCallback( (key: string) => { return state.fallbackData.get(key) }, [state.fallbackData], ) useEffect(() => { dispatch({ type: "SET_USER_STATE", payload: "loading" }) // Simulate user state resolution const timer = setTimeout(() => { // Set fallback data for returning users dispatch({ type: "SET_FALLBACK", payload: { key: "userPreferences", value: { theme: "dark", layout: "compact" } }, }) dispatch({ type: "SET_USER_STATE", payload: Math.random() > 0.5 ? "authenticated" : "anonymous" }) }, 1000) return () => clearTimeout(timer) }, []) return ( {children} ) } export function useCanonicalState() { const context = useContext(CanonicalStateContext) if (!context) { throw new Error("useCanonicalState must be used within CanonicalStateProvider") } return context } [V0_FILE]typescriptreact:file="components/dynamic-timeline.tsx" "use client" import type React from "react" import { useState } from "react" import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card" import { Button } from "@/components/ui/button" import { Badge } from "@/components/ui/badge" import { useCanonicalState } from "./canonical-state-provider" interface TimelinePlugin { id: string type: string render: (data: any, state: string) => React.ReactNode dependencies?: string[] } const pluginRegistry = new Map() pluginRegistry.set("user-profile", { id: "user-profile", type: "user-profile", render: (data, state) => (

User Profile

{state === "streaming" ? (

) : (

{data?.name || "Anonymous User"} - {data?.email || "No email"}

)}

), }) pluginRegistry.set("dashboard-widget", { id: "dashboard-widget", type: "dashboard-widget", render: (data, state) => (

Dashboard Widget

{state === "streaming" ? (

) : (

Metrics: {data?.metrics || "Loading..."}

Status: {data?.status || "Active"}

)}

), }) export function DynamicTimeline() { const { state, registerComponent, updateComponent, startStream, endStream, getFallback } = useCanonicalState() const [simulationRunning, setSimulationRunning] = useState(false) const simulateStreaming = async () => { setSimulationRunning(true) startStream() // Register components during streaming registerComponent({ id: "user-profile-1", type: "user-profile", data: null, dependencies: [], }) await new Promise((resolve) => setTimeout(resolve, 1000)) registerComponent({ id: "dashboard-widget-1", type: "dashboard-widget", data: null, dependencies: ["user-profile-1"], }) await new Promise((resolve) => setTimeout(resolve, 1500)) // End streaming and hydrate with data endStream() const userPrefs = getFallback("userPreferences") updateComponent("user-profile-1", { data: { name: state.userState === "authenticated" ? "John Doe" : "Anonymous", email: state.userState === "authenticated" ? "john@example.com" : null, preferences: userPrefs, }, }) updateComponent("dashboard-widget-1", { data: { metrics: "1,234 views", status: "Active", theme: userPrefs?.theme || "light", }, }) setSimulationRunning(false) } const getStateColor = (componentState: string) => { switch (componentState) { case "streaming": return "bg-blue-500" case "hydrated": return "bg-green-500" case "error": return "bg-red-500" case "fallback": return "bg-yellow-500" default: return "bg-gray-500" } } return (

Dynamic Timeline with Plugin Registry

{state.streamingActive ? "Streaming" : "Idle"} User: {state.userState}

Component Timeline

{state.timeline.length === 0 ? (

No components registered yet

) : (

{state.timeline.map((component) => { const plugin = pluginRegistry.get(component.type) return (

{component.id} {component.state} {new Date(component.timestamp).toLocaleTimeString()}

{plugin ? ( plugin.render(component.data, component.state) ) : (

Unknown component type: {component.type}

)}

) })}

)}

System State

Components Registered: {state.components.size}

Streaming Active: {state.streamingActive ? "Yes" : "No"}

User State: {state.userState}

Fallback Data: {state.fallbackData.size} entries

) }