I'm trying to understand how to create a interface with unknown number of properties in typescript? and I don't understand it because this code generates an error : why, I just want an object with any number of members of type I1
interface I0 {
[key: string]: I1;
}
class O implements I0 {
m: {
p1: "test",
p2: "test"
}
}
interface I1 {
[key: string]: "string";
}
You still have to declare properties that are provided by implements.
For example:
interface A { a: string }
class Foo implements A {
constructor() { this.a = 'abc' }
}
// Class 'Foo' incorrectly implements interface 'A'.
// Property 'a' is missing in type 'Foo' but required in type 'A'.(2420)
class Bar implements A {
a: string
constructor() { this.a = 'abc' }
}
// Fine
That means you need to declare the index signature in your class as well.
class O implements I0 {
[key: string]: I1
m: {
p1: "test",
p2: "test"
}
}
Here implements checks to make sure that the class supports interface I0, but that's all implements actually does.