Ways to utilize an interface with a blank object that will be filled at a subsequent time

I'm struggling to find the right words to explain my situation.

Essentially, I need to create an empty object that I plan to fill with data. I already have a clear idea of what the final structure of this object should be:

interface BodyInterface {
  name: string;
  lastName: string;
}

The data will be coming from a form submission and looks like this:

// The form data resembles:
// name: "foo"
// lastName: "bar"

My goal is to incorporate this data into an object that I can utilize later on:

const body = {}; // <- How can I implement the BodyInterface for this 'body' object

someArray.forEach(({ name, value }) => {
  body[name] = data.get(name).value as string;
});

Any suggestions on how I could achieve this?

Answer №1

Rohan Agarwal is ready to take on the task, but it's important to keep in mind that Typescript will no longer provide warnings for missing properties.

One approach is to utilize a Partial object.

const body: BodyInterface = Partial<BodyInterface>;

Although similar, Typescript will still check all properties without warning about missing ones, but now you have a type that accurately represents that knowledge.

Converting this into a non-partial version of BodyInterface can be challenging.

In my earlier code without typescript and in the early stages of using typescript, I would often gradually construct objects before returning them from functions. Through experience, I realized that to fully leverage typescript, it's better to abandon this practice. Instead, build up individual properties in variables and finally construct the entire BodyInterface at once as a final step.

It may require changing your habits, but ultimately you will maximize the benefits of what Typescript has to offer.

Answer №2

One way to accomplish this is:

let body:Body = {} as Body;

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