My understanding is that in TypeScript, we use new() to structurally type a class constructor. But how do we type an object that includes a new method, for example:
const k = {
new() {
return '123'
}
}
My understanding is that in TypeScript, we use new() to structurally type a class constructor. But how do we type an object that includes a new method, for example:
const k = {
new() {
return '123'
}
}
To create an object literal with the new keyword, you can utilize a class expression instead of corresponding object literal syntax:
const obj = class {
constructor () {
}
}
new obj()
play
In programming, the new keyword is utilized to create an instance of a class.
const obj = new MyClass();
To specify the constructor of a class, you need to employ the constructor keyword.
class MyClass1 {
constructor() {
}
}
const MyClass2 = class {
constructor() {
}
}
interface MyClass3 {
constructor(): Function;
}
MyClass1 and MyClass2 are essentially similar.
It's important to note that with MyClass3, you cannot directly instantiate it like const obj = new MyClass3(). However, you can assign it with
const obj: MyClass3 = new MyClass1()MyClass3 functions strictly as an interface for typing purposes only.
Another point to remember is that in Typescript, when defining a class, it implicitly generates an interface which allows one class to implements another.
For further information, refer to the TypeScript documentation: Class Interface
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