In this article we will learn about some of the frequently asked TypeScript programming questions in technical like “typescript declare global” Code Answer’s. When creating scripts and web applications, error handling is an important part. If your code lacks error checking code, your program may look very unprofessional and you may be open to security risks. Error or stack handling on typescript was simple and easy. An error message with filename, line number and a message describing the error is sent to the browser. This tutorial contains some of the most common error checking methods in Typescript. Below are some solution about “typescript declare global” Code Answer’s.
typescript add global variable to window
xxxxxxxxxx
1
declare global {
2
interface Window {
3
FB:any;
4
}
5
}
6
7
let FB = window.FB; // ok now
typescript declare global
xxxxxxxxxx
1
ts// Type definitions for [~THE LIBRARY NAME~] [~OPTIONAL VERSION NUMBER~]
2
// Project: [~THE PROJECT NAME~]
3
// Definitions by: [~YOUR NAME~] <[~A URL FOR YOU~]>
4
5
/*~ If this library is callable (e.g. can be invoked as myLib(3)),
6
*~ include those call signatures here.
7
*~ Otherwise, delete this section.
8
*/
9
declare function myLib(a: string): string;
10
declare function myLib(a: number): number;
11
12
/*~ If you want the name of this library to be a valid type name,
13
*~ you can do so here.
14
*~
15
*~ For example, this allows us to write 'var x: myLib';
16
*~ Be sure this actually makes sense! If it doesn't, just
17
*~ delete this declaration and add types inside the namespace below.
18
*/
19
interface myLib {
20
name: string;
21
length: number;
22
extras?: string[];
23
}
24
25
/*~ If your library has properties exposed on a global variable,
26
*~ place them here.
27
*~ You should also place types (interfaces and type alias) here.
28
*/
29
declare namespace myLib {
30
//~ We can write 'myLib.timeout = 50;'
31
let timeout: number;
32
33
//~ We can access 'myLib.version', but not change it
34
const version: string;
35
36
//~ There's some class we can create via 'let c = new myLib.Cat(42)'
37
//~ Or reference e.g. 'function f(c: myLib.Cat) { ... }
38
class Cat {
39
constructor(n: number);
40
41
//~ We can read 'c.age' from a 'Cat' instance
42
readonly age: number;
43
44
//~ We can invoke 'c.purr()' from a 'Cat' instance
45
purr(): void;
46
}
47
48
//~ We can declare a variable as
49
//~ 'var s: myLib.CatSettings = { weight: 5, name: "Maru" };'
50
interface CatSettings {
51
weight: number;
52
name: string;
53
tailLength?: number;
54
}
55
56
//~ We can write 'const v: myLib.VetID = 42;'
57
//~ or 'const v: myLib.VetID = "bob";'
58
type VetID = string | number;
59
60
//~ We can invoke 'myLib.checkCat(c)' or 'myLib.checkCat(c, v);'
61
function checkCat(c: Cat, s?: VetID);
62
}
