Tips for handling interfaces that are of an unusually large size?

Imagine having an interface like the one below with 10 or more properties:

export interface EmployeeFilter {
  name: string;
  gender: string;
  age: number;
  from: Date;
  to: Date;
  module: string;
  position: string;
  phone: string;
  email: string;
  country: string;
}

Is there a way to automatically initialize an object with the properties defined in EmployeeFilter without explicitly setting them?

Currently, I have to manually set the properties like this:

const searchby: EmployeeFilter = {
  name: '',
  gender: '',
  age: 28,
  from: null,
  to: null,
  module: '',
  position: '',
  phone: '',
  email: '',
  country: ''
}

I am searching for a method that would automatically initialize all the properties of EmployeeFilter by setting them to null. I've experimented with different approaches such as:

const searchby: EmployeeFilter = new class implements EmployeeFilter{}();

However, when I do console.log(searchby);, all I see is an empty object literal {}.

Answer №1

Interfaces are purely a part of the type system, and TypeScript's types have no impact on the resulting JavaScript code.

As such, it is entirely unfeasible to modify the emitted JavaScript simply by using an interface.

Nevertheless, considering substituting the interface with a class may provide a solution.

Answer №2

A strategy to generate instances of the EmployeeFilter type is by implementing a factory class specifically for this purpose. By designating all fields in the EmployeeFilter interface as optional, such as name?: string;, you can ensure flexibility in defining default values. Due to interfaces not being present during runtime but only utilized for type checking at compile time, attempts to instantiate an interface or convert it into a class will inevitably fail.

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