Looking to nest JavaScript objects in TypeScript? Here's how:
let endpoints = {
auth: {
login: "http://localhost:8079/auth/login"
}
};
If you try the following code, it won't work as expected:
private endpoints: Object = {
auth: {
login: "http://localhost:8079/auth/login"
}
};
You might encounter an error like this:
error TS2339: Property 'auth' does not exist on type 'Object'.Utilizing interfaces in TypeScript can help organize your code:
interface EndpointAuth {
login: string;
}
interface Endpoint {
auth: EndpointAuth;
}
let endpoints: Endpoint = {
auth: {
login: "http://localhost:8079/auth/login"
}
};
You can also define types with the same structure as interfaces:
type EndpointAuth = {
login: string;
}
type Endpoint = {
auth: EndpointAuth;
}
Alternatively, you can use inline type declarations for objects:
let endpoints: { auth: { login: string } } = {
auth: {
login: "http://localhost:8079/auth/login"
}
};
You are not limited to just one approach and can combine them as needed.
Explanation on why using Object may not work as intended:
Assigning a variable the type of Object might not be the ideal choice, consider using any instead:
var endpoints2: any = {
auth: {
login: "http://localhost:8079/auth/login"
}
};
Specifying a type as Object is similar to defining an empty object ({}) which may not align with your intentions. Using any sacrifices some type safety but allows for more flexibility:
let o: any = { x: 3, y: 6 };
console.log(o.z.toString());
Using any will not catch errors at compile time but may result in runtime errors. It's recommended to define specific types for better error checking:
let o: { x: number, y: number } = { x: 3, y: 6 };
console.log(o.z.toString());
One way to structure your code is by declaring an Interface.
In this specific scenario
interface IEndpoints
{
auth: {
login: string;
}
}
private endpoints: IEndpoints = {
auth: {
login: "http://localhost:8079/auth/login"
}
};
It's possible that the version of TypeScript you were previously using did not support this feature, but in the current version it is indeed supported.
interface APIEndpoints {
[path: string]: APIEndpoints | string
}
const apiEndpoints: APIEndpoints = {
users: {
profile: "http://api.example.com/users/profile"
}
}
To ensure type safety, it is recommended to create a custom class or interface:
interface ICustomInterface
{
authentication: IAuthentication;
}
interface IAuthentication
{
loginUrl: string;
}
private apiEndpoints: ICustomInterface = {
authentication: {
loginUrl: "http://localhost:8079/auth/login"
}
};
The error you are encountering is due to declaring endpoints as type Object, which does not have an 'authentication' property.
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