Back to Snippets
Core Syntax
Complex

Type-Safe Template Refs & DOM Manipulation

Implement type-safe template refs and DOM manipulation in Vue 3 and React 18 using TypeScript. Vue uses typed ref() declarations for template references, while React leverages useRef() with explicit type annotations for DOM elements. This pattern ensures type safety when accessing and manipulating DOM elements, preventing "null" or "undefined" errors and ensuring correct usage of DOM APIs. Use cases: Form focus management, custom scroll behavior, dynamic element sizing, third-party library integration.

Vue 3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103

Related Snippets

Core Syntax
Complex

Reactive State Declaration with TypeScript

Declare strongly-typed reactive state for primitive values and objects in Vue 3 and React 18. Vue uses ref (for...

<script setup lang="ts">
  import { ref, reactive } from 'vue';
  
  // Reactive primitive with explicit type (ref for primitives)
  const count = ref<number>(0);
  const username = ref<string>('John Doe');
  const isAuthenticated = ref<boolean>(false);
Core Syntax
Complex

Typed Event Handling & Custom Events

Implement type-safe event handling for native DOM events and custom events in Vue 3 and React 18. Vue uses defineEmi...

<script setup lang="ts">
  import { defineEmits } from 'vue';
  
  // Type-safe custom events with payload types
  const emit = defineEmits<{
    // Event name: [payload type]
    'user-selected': [userId: number];
    'filter-changed': [filters: { search: string; active: boolean }];
Core Syntax
Complex

Conditional Rendering with Type Guards

Implement type-safe conditional rendering using TypeScript type guards in Vue 3 and React 18. This pattern ensures t...

<script setup lang="ts">
  // Define union type for different states
  type LoadingState = { type: 'loading' };
  type SuccessState = { type: 'success'; data: string[] };
  type ErrorState = { type: 'error'; message: string };
  type DataState = LoadingState | SuccessState | ErrorState;

  // Type guard functions (type predicates)