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Posted on Jun 21

Migrating from Vue.js to Juris: A Practical Guide

#vue #webdev #juris #javascript

A step-by-step approach to transitioning your Vue.js applications to Juris enhance()

Why Consider Migration?

If you're reading this, you might be experiencing some of these Vue.js pain points:

Build complexity - Webpack configurations, CLI dependencies, and tooling overhead
Bundle size concerns - Large framework footprint affecting performance
Over-engineering - Simple features requiring complex component hierarchies
Legacy integration challenges - Difficulty enhancing existing non-Vue pages
Team onboarding - New developers struggling with Vue-specific patterns

Juris offers a lighter alternative that maintains reactive capabilities while eliminating much of the complexity.

Migration Strategy Overview

Approach 1: Gradual Page-by-Page Migration (Recommended)

Keep existing Vue app running
Migrate individual pages/sections to Juris
Eventually phase out Vue entirely

Approach 2: Component-by-Component Replacement

Replace Vue components with Juris enhancements
Maintain similar functionality and structure
Gradual transition within existing pages

Approach 3: Full Rewrite (High Risk)

Complete application rewrite using Juris
Only recommended for small applications
Fastest but most disruptive approach

Pre-Migration Assessment

1. Audit Your Current Vue Application

Components to catalog:

# Find all Vue components
find src -name "*.vue" | wc -l

# Identify complex components (>100 lines)
find src -name "*.vue" -exec wc -l {} + | sort -nr

# List Vuex store modules
ls src/store/modules/

Dependencies to review:

Vue Router usage
Vuex store complexity
Third-party Vue components
Custom directives
Mixins and composition functions

2. Complexity Assessment

Low Complexity (Easy Migration):

Simple forms and interactions
Basic state management
Minimal component nesting
Standard HTML structures

Medium Complexity (Moderate Effort):

Complex forms with validation
Multiple store modules
Dynamic component rendering
Route-based state management

High Complexity (Requires Planning):

Heavy use of slots and provide/inject
Complex animation systems
Extensive component composition
Advanced Vue features (teleport, suspense)

Step 1: Setting Up Juris Alongside Vue

1.1 Install Juris

<!-- Include Juris from unpkg CDN -->
<script src="https://unpkg.com/[email protected]/juris.js"></script>

1.2 Initialize Juris

// Create Juris instance alongside Vue
window.jurisApp = new Juris({
    states: {
        // Initial state from your Vuex store
        user: vuexStore.state.user,
        ui: vuexStore.state.ui
    },
    services: {
        // Migrate Vuex actions to services
        userService: {
            login: async (credentials) => {
                const user = await api.login(credentials);
                jurisApp.setState('user', user);
                return user;
            },
            logout: () => {
                jurisApp.setState('user', null);
                localStorage.removeItem('token');
            }
        }
    }
});

1.3 State Synchronization Bridge

// Keep Vuex and Juris in sync during transition
const stateBridge = {
    // Sync Vuex changes to Juris
    vuexToJuris: (store) => {
        store.subscribe((mutation, state) => {
            // Mirror important state changes
            if (mutation.type === 'SET_USER') {
                jurisApp.setState('user', state.user);
            }
            if (mutation.type === 'UPDATE_UI') {
                jurisApp.setState('ui', state.ui);
            }
        });
    },

    // Sync Juris changes to Vuex
    jurisToVuex: (store) => {
        jurisApp.subscribe('user', (user) => {
            store.commit('SET_USER', user);
        });

        jurisApp.subscribe('ui', (ui) => {
            store.commit('UPDATE_UI', ui);
        });
    }
};

// Initialize bridges
stateBridge.vuexToJuris(vuexStore);
stateBridge.jurisToVuex(vuexStore);

Step 2: Component Migration Patterns

2.1 Simple Components

Vue Component:

<!-- UserGreeting.vue -->
<template>
  <div class="greeting">
    <h2>Welcome, {{ user.name }}!</h2>
    <p>Last login: {{ formatDate(user.lastLogin) }}</p>
    <button @click="refreshData">Refresh</button>
  </div>
</template>

<script>
export default {
  computed: {
    user() {
      return this.$store.state.user;
    }
  },
  methods: {
    formatDate(date) {
      return new Date(date).toLocaleDateString();
    },
    refreshData() {
      this.$store.dispatch('user/refresh');
    }
  }
}
</script>

Juris Enhancement:

// Replace the Vue component with enhancement
juris.enhance('.greeting', ({ getState, userService }) => ({
    children: () => {
        const user = getState('user');
        if (!user) return [{ div: { text: 'Please log in' } }];

        return [
            { h2: { text: `Welcome, ${user.name}!` } },
            { p: { text: `Last login: ${new Date(user.lastLogin).toLocaleDateString()}` } },
            { button: { 
                text: 'Refresh',
                onclick: () => userService.refresh()
            }}
        ];
    }
}));

2.2 Form Components

Vue Form:

<!-- ContactForm.vue -->
<template>
  <form @submit.prevent="handleSubmit">
    <div class="field">
      <label>Name</label>
      <input 
        v-model="form.name"
        :class="{ error: errors.name }"
        @blur="validateName"
      />
      <span v-if="errors.name" class="error">{{ errors.name }}</span>
    </div>

    <div class="field">
      <label>Email</label>
      <input 
        type="email"
        v-model="form.email"
        :class="{ error: errors.email }"
        @blur="validateEmail"
      />
      <span v-if="errors.email" class="error">{{ errors.email }}</span>
    </div>

    <button type="submit" :disabled="!isValid">
      {{ isSubmitting ? 'Sending...' : 'Send Message' }}
    </button>
  </form>
</template>

<script>
export default {
  data() {
    return {
      form: { name: '', email: '', message: '' },
      errors: {},
      isSubmitting: false
    }
  },
  computed: {
    isValid() {
      return Object.keys(this.errors).length === 0 && 
             this.form.name && this.form.email;
    }
  },
  methods: {
    validateName() {
      if (!this.form.name.trim()) {
        this.$set(this.errors, 'name', 'Name is required');
      } else {
        this.$delete(this.errors, 'name');
      }
    },
    validateEmail() {
      const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
      if (!emailRegex.test(this.form.email)) {
        this.$set(this.errors, 'email', 'Valid email required');
      } else {
        this.$delete(this.errors, 'email');
      }
    },
    async handleSubmit() {
      this.isSubmitting = true;
      try {
        await this.$store.dispatch('contact/send', this.form);
        this.resetForm();
      } catch (error) {
        this.handleError(error);
      } finally {
        this.isSubmitting = false;
      }
    }
  }
}
</script>

Juris Enhancement:

const juris = new Juris({
    services: {
        contactForm: {
            validate: (field, value) => {
                let error = null;
                if (field === 'name' && !value.trim()) {
                    error = 'Name is required';
                } else if (field === 'email' && !/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(value)) {
                    error = 'Valid email required';
                }
                juris.setState(`contactForm.errors.${field}`, error);
                return !error;
            },

            isValid: () => {
                const errors = juris.getState('contactForm.errors', {});
                const form = juris.getState('contactForm.data', {});
                return Object.values(errors).every(error => !error) && 
                       form.name && form.email;
            },

            submit: async () => {
                juris.setState('contactForm.submitting', true);
                try {
                    const formData = juris.getState('contactForm.data');
                    await api.contact.send(formData);
                    juris.setState('contactForm.data', {});
                    juris.setState('contactForm.errors', {});
                } catch (error) {
                    console.error('Contact form error:', error);
                } finally {
                    juris.setState('contactForm.submitting', false);
                }
            }
        }
    }
});

juris.enhance('form.contact-form', {
    selectors: {
        'input[name]': (ctx) => {
            const field = ctx.element.name;
            return {
                value: () => juris.getState(`contactForm.data.${field}`, ''),
                oninput: (e) => juris.setState(`contactForm.data.${field}`, e.target.value),
                onblur: ({ contactForm }) => contactForm.validate(field, ctx.element.value),
                className: () => juris.getState(`contactForm.errors.${field}`) ? 'error' : ''
            };
        },

        '.error-message': (ctx) => {
            const field = ctx.element.dataset.field;
            return {
                text: () => juris.getState(`contactForm.errors.${field}`, ''),
                style: () => ({
                    display: juris.getState(`contactForm.errors.${field}`) ? 'block' : 'none'
                })
            };
        },

        'button[type="submit"]': ({ contactForm }) => ({
            disabled: () => !contactForm.isValid(),
            text: () => juris.getState('contactForm.submitting') ? 'Sending...' : 'Send Message',
            onclick: (e) => {
                e.preventDefault();
                contactForm.submit();
            }
        })
    }
});

2.3 List Components with Dynamic Data

Vue List Component:

<!-- TodoList.vue -->
<template>
  <div class="todo-list">
    <div class="filters">
      <button 
        v-for="filter in filters"
        :key="filter"
        :class="{ active: currentFilter === filter }"
        @click="setFilter(filter)"
      >
        {{ filter }}
      </button>
    </div>

    <div class="todos">
      <todo-item
        v-for="todo in filteredTodos"
        :key="todo.id"
        :todo="todo"
        @toggle="toggleTodo"
        @delete="deleteTodo"
      />
    </div>

    <div class="stats">
      {{ activeCount }} of {{ totalCount }} remaining
    </div>
  </div>
</template>

<script>
import TodoItem from './TodoItem.vue';

export default {
  components: { TodoItem },
  data() {
    return {
      filters: ['all', 'active', 'completed']
    }
  },
  computed: {
    todos() {
      return this.$store.state.todos;
    },
    currentFilter() {
      return this.$store.state.filter;
    },
    filteredTodos() {
      return this.todos.filter(todo => {
        if (this.currentFilter === 'active') return !todo.completed;
        if (this.currentFilter === 'completed') return todo.completed;
        return true;
      });
    },
    activeCount() {
      return this.todos.filter(t => !t.completed).length;
    },
    totalCount() {
      return this.todos.length;
    }
  },
  methods: {
    setFilter(filter) {
      this.$store.commit('SET_FILTER', filter);
    },
    toggleTodo(id) {
      this.$store.dispatch('todos/toggle', id);
    },
    deleteTodo(id) {
      this.$store.dispatch('todos/delete', id);
    }
  }
}
</script>

Juris Enhancement:

const juris = new Juris({
    services: {
        todoManager: {
            setFilter: (filter) => {
                juris.setState('todos.filter', filter);
            },

            toggle: (id) => {
                const todos = juris.getState('todos.items', []);
                const updated = todos.map(todo => 
                    todo.id === id ? { ...todo, completed: !todo.completed } : todo
                );
                juris.setState('todos.items', updated);
            },

            delete: (id) => {
                const todos = juris.getState('todos.items', []);
                juris.setState('todos.items', todos.filter(t => t.id !== id));
            },

            getFiltered: () => {
                const todos = juris.getState('todos.items', []);
                const filter = juris.getState('todos.filter', 'all');

                return todos.filter(todo => {
                    if (filter === 'active') return !todo.completed;
                    if (filter === 'completed') return todo.completed;
                    return true;
                });
            },

            getStats: () => {
                const todos = juris.getState('todos.items', []);
                return {
                    active: todos.filter(t => !t.completed).length,
                    total: todos.length
                };
            }
        }
    }
});

juris.enhance('.todo-list', ({ getState, todoManager }) => ({
    children: () => [
        // Filters
        {
            div: {
                className: 'filters',
                children: ['all', 'active', 'completed'].map(filter => ({
                    button: {
                        text: filter,
                        className: getState('todos.filter') === filter ? 'active' : '',
                        onclick: () => todoManager.setFilter(filter)
                    }
                }))
            }
        },

        // Todo items
        {
            div: {
                className: 'todos',
                children: todoManager.getFiltered().map(todo => ({
                    div: {
                        className: `todo-item ${todo.completed ? 'completed' : ''}`,
                        children: [
                            {
                                input: {
                                    type: 'checkbox',
                                    checked: todo.completed,
                                    onchange: () => todoManager.toggle(todo.id)
                                }
                            },
                            { span: { text: todo.text } },
                            {
                                button: {
                                    text: '×',
                                    onclick: () => todoManager.delete(todo.id)
                                }
                            }
                        ]
                    }
                }))
            }
        },

        // Stats
        {
            div: {
                className: 'stats',
                text: () => {
                    const stats = todoManager.getStats();
                    return `${stats.active} of ${stats.total} remaining`;
                }
            }
        }
    ]
}));

Step 3: State Management Migration

3.1 Vuex Store to Juris Services

Vuex Store Module:

// store/modules/user.js
export default {
  namespaced: true,
  state: {
    profile: null,
    preferences: {},
    isLoading: false
  },
  mutations: {
    SET_PROFILE(state, profile) {
      state.profile = profile;
    },
    SET_PREFERENCES(state, preferences) {
      state.preferences = preferences;
    },
    SET_LOADING(state, loading) {
      state.isLoading = loading;
    }
  },
  actions: {
    async fetchProfile({ commit }) {
      commit('SET_LOADING', true);
      try {
        const profile = await api.user.getProfile();
        commit('SET_PROFILE', profile);
      } catch (error) {
        console.error('Failed to fetch profile:', error);
      } finally {
        commit('SET_LOADING', false);
      }
    },
    async updatePreferences({ commit }, preferences) {
      try {
        await api.user.updatePreferences(preferences);
        commit('SET_PREFERENCES', preferences);
      } catch (error) {
        console.error('Failed to update preferences:', error);
      }
    }
  },
  getters: {
    isLoggedIn: state => !!state.profile,
    displayName: state => state.profile?.name || 'Guest',
    theme: state => state.preferences.theme || 'light'
  }
}

Juris Service:

const juris = new Juris({
    states: {
        user: {
            profile: null,
            preferences: {},
            isLoading: false
        }
    },
    services: {
        userService: {
            async fetchProfile() {
                juris.setState('user.isLoading', true);
                try {
                    const profile = await api.user.getProfile();
                    juris.setState('user.profile', profile);
                } catch (error) {
                    console.error('Failed to fetch profile:', error);
                } finally {
                    juris.setState('user.isLoading', false);
                }
            },

            async updatePreferences(preferences) {
                try {
                    await api.user.updatePreferences(preferences);
                    juris.setState('user.preferences', preferences);
                } catch (error) {
                    console.error('Failed to update preferences:', error);
                }
            },

            // Getters as computed functions
            isLoggedIn: () => !!juris.getState('user.profile'),
            getDisplayName: () => juris.getState('user.profile')?.name || 'Guest',
            getTheme: () => juris.getState('user.preferences.theme', 'light')
        }
    }
});

3.2 Migrating Complex State Logic

Vue Composition API:

// composables/useShoppingCart.js
import { computed, reactive } from 'vue';
import { useStore } from 'vuex';

export function useShoppingCart() {
  const store = useStore();

  const cartItems = computed(() => store.state.cart.items);
  const cartTotal = computed(() => 
    cartItems.value.reduce((sum, item) => sum + (item.price * item.quantity), 0)
  );

  const addItem = (product) => {
    store.dispatch('cart/addItem', product);
  };

  const removeItem = (productId) => {
    store.dispatch('cart/removeItem', productId);
  };

  const updateQuantity = (productId, quantity) => {
    store.dispatch('cart/updateQuantity', { productId, quantity });
  };

  return {
    cartItems,
    cartTotal,
    addItem,
    removeItem,
    updateQuantity
  };
}

Juris Service:

const juris = new Juris({
    states: {
        cart: {
            items: []
        }
    },
    services: {
        cartService: {
            getItems: () => juris.getState('cart.items', []),

            getTotal: () => {
                const items = juris.getState('cart.items', []);
                return items.reduce((sum, item) => sum + (item.price * item.quantity), 0);
            },

            addItem: (product) => {
                const items = juris.getState('cart.items', []);
                const existingItem = items.find(item => item.id === product.id);

                if (existingItem) {
                    const updated = items.map(item => 
                        item.id === product.id 
                            ? { ...item, quantity: item.quantity + 1 }
                            : item
                    );
                    juris.setState('cart.items', updated);
                } else {
                    juris.setState('cart.items', [...items, { ...product, quantity: 1 }]);
                }
            },

            removeItem: (productId) => {
                const items = juris.getState('cart.items', []);
                juris.setState('cart.items', items.filter(item => item.id !== productId));
            },

            updateQuantity: (productId, quantity) => {
                const items = juris.getState('cart.items', []);
                const updated = items.map(item => 
                    item.id === productId ? { ...item, quantity } : item
                );
                juris.setState('cart.items', updated);
            }
        }
    }
});

// Usage in components
juris.enhance('.cart-summary', ({ cartService }) => ({
    children: () => [
        {
            div: {
                className: 'cart-total',
                text: `Total: $${cartService.getTotal().toFixed(2)}`
            }
        },
        {
            div: {
                className: 'cart-items',
                children: cartService.getItems().map(item => ({
                    div: {
                        className: 'cart-item',
                        children: [
                            { span: { text: item.name } },
                            { span: { text: `$${item.price}` } },
                            {
                                input: {
                                    type: 'number',
                                    value: item.quantity,
                                    onchange: (e) => cartService.updateQuantity(item.id, parseInt(e.target.value))
                                }
                            },
                            {
                                button: {
                                    text: 'Remove',
                                    onclick: () => cartService.removeItem(item.id)
                                }
                            }
                        ]
                    }
                }))
            }
        }
    ]
}));

Step 4: Routing Migration

4.1 Vue Router to Juris State-Based Routing

Vue Router Setup:

// router/index.js
import { createRouter, createWebHistory } from 'vue-router';
import Home from '../views/Home.vue';
import About from '../views/About.vue';
import Contact from '../views/Contact.vue';

const routes = [
  { path: '/', component: Home },
  { path: '/about', component: About },
  { path: '/contact', component: Contact }
];

export default createRouter({
  history: createWebHistory(),
  routes
});

Juris Routing Service:

const juris = new Juris({
    states: {
        router: {
            currentRoute: '/',
            params: {},
            query: {}
        }
    },
    services: {
        router: {
            navigate: (path) => {
                juris.setState('router.currentRoute', path);
                history.pushState({}, '', path);
            },

            getCurrentRoute: () => juris.getState('router.currentRoute'),

            parseUrl: () => {
                const path = window.location.pathname;
                const query = new URLSearchParams(window.location.search);
                const queryObj = Object.fromEntries(query.entries());

                juris.setState('router.currentRoute', path);
                juris.setState('router.query', queryObj);
            },

            init: () => {
                // Parse initial URL
                juris.services.router.parseUrl();

                // Listen for browser navigation
                window.addEventListener('popstate', () => {
                    juris.services.router.parseUrl();
                });
            }
        }
    }
});

// Initialize routing
juris.services.router.init();

// Route-based rendering
juris.enhance('.app-content', ({ getState }) => ({
    children: () => {
        const route = getState('router.currentRoute');

        switch (route) {
            case '/':
                return [{ div: { className: 'home-page', innerHTML: homePageContent } }];
            case '/about':
                return [{ div: { className: 'about-page', innerHTML: aboutPageContent } }];
            case '/contact':
                return [{ div: { className: 'contact-page', innerHTML: contactPageContent } }];
            default:
                return [{ div: { className: 'not-found', text: '404 - Page not found' } }];
        }
    }
}));

// Navigation links
juris.enhance('nav a', ({ router }) => ({
    onclick: (e) => {
        e.preventDefault();
        const path = e.target.getAttribute('href');
        router.navigate(path);
    }
}));

Step 5: Testing Migration

5.1 Testing Juris Enhancements

// tests/enhancements.test.js
describe('Contact Form Enhancement', () => {
    let juris;
    let mockElement;

    beforeEach(() => {
        // Setup Juris instance
        juris = new Juris({
            services: {
                contactForm: {
                    validate: (field, value) => {
                        // Test validation logic
                    }
                }
            }
        });

        // Create mock DOM element
        mockElement = document.createElement('form');
        mockElement.innerHTML = `
            <input name="email" type="email" />
            <button type="submit">Submit</button>
        `;
        document.body.appendChild(mockElement);
    });

    afterEach(() => {
        document.body.removeChild(mockElement);
    });

    test('should validate email input', () => {
        // Enhance the form
        juris.enhance('form', { /* enhancement config */ });

        // Test email validation
        const emailInput = mockElement.querySelector('input[name="email"]');
        emailInput.value = 'invalid-email';
        emailInput.dispatchEvent(new Event('blur'));

        // Assert validation error
        expect(juris.getState('contactForm.errors.email')).toBeTruthy();
    });

    test('should enable submit when form is valid', () => {
        juris.enhance('form', { /* enhancement config */ });

        // Fill valid data
        const emailInput = mockElement.querySelector('input[name="email"]');
        emailInput.value = '[email protected]';
        emailInput.dispatchEvent(new Event('input'));

        // Check submit button state
        const submitBtn = mockElement.querySelector('button[type="submit"]');
        expect(submitBtn.disabled).toBeFalsy();
    });
});

5.2 Integration Testing

// tests/integration.test.js
describe('Vue to Juris Migration', () => {
    test('should maintain state sync between Vue and Juris', () => {
        // Setup both Vue and Juris instances
        const vueApp = createApp(/* Vue app */);
        const juris = new Juris(/* Juris config */);

        // Setup state bridge
        setupStateBridge(vueApp, juris);

        // Test state synchronization
        vueApp.$store.commit('SET_USER', { name: 'John' });
        expect(juris.getState('user.name')).toBe('John');

        juris.setState('user.email', '[email protected]');
        expect(vueApp.$store.state.user.email).toBe('[email protected]');
    });
});

Step 6: Performance Optimization

6.1 Bundle Size Optimization

// Before migration (Vue + Vuex + Router)
// Total bundle size: ~150KB gzipped

// After migration (Juris only)
// Total bundle size: ~25KB gzipped
// Reduction: 83% smaller

// Measurement script
function measureBundleSize() {
    const scripts = document.querySelectorAll('script[src]');
    let totalSize = 0;

    scripts.forEach(script => {
        fetch(script.src)
            .then(response => response.blob())
            .then(blob => {
                totalSize += blob.size;
                console.log(`${script.src}: ${blob.size} bytes`);
            });
    });

    setTimeout(() => {
        console.log(`Total bundle size: ${totalSize} bytes`);
    }, 1000);
}

6.2 Runtime Performance Comparison

// Performance monitoring
const performanceMonitor = {
    startTime: performance.now(),

    measureRenderTime: (label) => {
        const endTime = performance.now();
        console.log(`${label}: ${endTime - performanceMonitor.startTime}ms`);
        performanceMonitor.startTime = endTime;
    },

    measureMemoryUsage: () => {
        if (performance.memory) {
            console.log('Memory usage:', {
                used: Math.round(performance.memory.usedJSHeapSize / 1024 / 1024) + 'MB',
                total: Math.round(performance.memory.totalJSHeapSize / 1024 / 1024) + 'MB'
            });
        }
    }
};

// Test Vue component render time
performanceMonitor.measureRenderTime('Vue component mount');

// Test Juris enhancement time
performanceMonitor.measureRenderTime('Juris enhancement');

// Memory comparison
performanceMonitor.measureMemoryUsage();

Step 7: Complete Migration Checklist

7.1 Pre-Migration

[ ] Complete application audit
[ ] Identify migration complexity
[ ] Set up Juris alongside Vue
[ ] Create state synchronization bridge
[ ] Plan migration order

7.2 Component Migration

[ ] Migrate simple components first
[ ] Convert complex forms
[ ] Handle dynamic lists
[ ] Update event handling
[ ] Test each migrated component

7.3 State Management

[ ] Convert Vuex modules to Juris services
[ ] Migrate computed properties
[ ] Update action/mutation patterns
[ ] Test state synchronization

7.4 Routing

[ ] Replace Vue Router with Juris routing
[ ] Update navigation links
[ ] Handle route parameters
[ ] Test browser navigation

7.5 Testing & Optimization

[ ] Write tests for Juris enhancements
[ ] Performance testing
[ ] Bundle size measurement
[ ] User acceptance testing

7.6 Cleanup

[ ] Remove Vue dependencies
[ ] Clean up build configuration
[ ] Update documentation
[ ] Team training on Juris patterns

Troubleshooting Common Issues

Issue 1: State Synchronization Problems

Problem: Vue and Juris state getting out of sync

Solution:

// Improved state bridge with error handling
const robustStateBridge = {
    setupSync: (vueStore, juris) => {
        // Vuex to Juris with validation
        vueStore.subscribe((mutation, state) => {
            try {
                const stateMapping = {
                    'SET_USER': () => juris.setState('user', state.user),
                    'UPDATE_UI': () => juris.setState('ui', state.ui)
                };

                if (stateMapping[mutation.type]) {
                    stateMapping[mutation.type]();
                }
            } catch (error) {
                console.error('State sync error:', error);
            }
        });

        // Juris to Vuex with validation
        juris.subscribe('user', (user) => {
            try {
                vueStore.commit('SET_USER', user);
            } catch (error) {
                console.error('Reverse sync error:', error);
            }
        });
    }
};

Issue 2: Component Lifecycle Differences

Problem: Vue lifecycle hooks not available in Juris

Solution:

// Simulate Vue lifecycle with Juris patterns
const lifecycleSimulator = {
    onMounted: (callback) => {
        // Use MutationObserver to detect when elements are added
        const observer = new MutationObserver((mutations) => {
            mutations.forEach((mutation) => {
                if (mutation.type === 'childList') {
                    mutation.addedNodes.forEach((node) => {
                        if (node.nodeType === Node.ELEMENT_NODE) {
                            // Element was mounted
                            setTimeout(callback, 0);
                        }
                    });
                }
            });
        });

        observer.observe(document.body, {
            childList: true,
            subtree: true
        });

        return observer;
    },

    onUnmounted: (element, callback) => {
        // Use MutationObserver to detect removal
        const observer = new MutationObserver((mutations) => {
            mutations.forEach((mutation) => {
                if (mutation.type === 'childList') {
                    mutation.removedNodes.forEach((node) => {
                        if (node === element || node.contains(element)) {
                            callback();
                            observer.disconnect();
                        }
                    });
                }
            });
        });

        observer.observe(document.body, {
            childList: true,
            subtree: true
        });

        return observer;
    }
};

Issue 3: Complex Component Communication

Problem: Parent-child component communication patterns

Solution:

// Event bus pattern for component communication
const eventBus = {
    listeners: new Map(),

    emit: (event, data) => {
        const callbacks = eventBus.listeners.get(event) || [];
        callbacks.forEach(callback => callback(data));
    },

    on: (event, callback) => {
        if (!eventBus.listeners.has(event)) {
            eventBus.listeners.set(event, []);
        }
        eventBus.listeners.get(event).push(callback);

        // Return unsubscribe function
        return () => {
            const callbacks = eventBus.listeners.get(event);
            const index = callbacks.indexOf(callback);
            if (index > -1) {
                callbacks.splice(index, 1);
            }
        };
    }
};

// Use in Juris enhancements
juris.enhance('.parent-component', ({ getState }) => ({
    children: () => [
        {
            div: {
                className: 'child-component',
                onclick: () => eventBus.emit('child-clicked', { id: 1 })
            }
        }
    ]
}));

// Listen for events in another component
const unsubscribe = eventBus.on('child-clicked', (data) => {
    console.log('Child clicked:', data);
});

Migration Timeline Example

Week 1-2: Assessment and Setup

Application audit
Complexity assessment
Include Juris via <script src="https://unpkg.com/[email protected]/juris.js"></script>
Bridge implementation

Week 3-4: Simple Components

Migrate basic UI components
Convert simple forms
Update styling and interactions

Week 5-6: State Management

Convert Vuex modules
Migrate complex forms
Update computed properties

Week 7-8: Advanced Features

Routing migration
Component communication patterns
Performance optimization

Week 9-10: Testing and Cleanup

Comprehensive testing
Vue dependency removal
Documentation updates

Conclusion

Migrating from Vue.js to Juris requires careful planning but offers significant benefits:

Benefits of Migration:

87% smaller bundle size - Just include https://unpkg.com/[email protected]/juris.js
Simplified development - No build tools required
Better legacy integration - Works with existing HTML
Reduced complexity - Fewer abstractions and patterns
Improved maintainability - Less framework-specific code

Success Factors:

Gradual approach - Migrate incrementally
Thorough testing - Ensure functionality parity
Team training - Learn Juris patterns
Performance monitoring - Measure improvements
Documentation - Update development processes

The migration from Vue.js to Juris represents a shift from complex, build-dependent development to simpler, more direct web development patterns. While it requires effort upfront, the long-term benefits of reduced complexity and improved performance make it a worthwhile investment for many projects.