Typescript interface default that will get overridden in constructor

Question

I have an interface that has a property matchMaker, it looks like this:

export interface ServerOptions {
  matchMaker: MatchMakerType<MatchMaker>
}

I then have a class that sets up default values for to utilize that interface which looks like this:

export class Server {
  public readonly settings: ServerOptions = {
    matchMaker: undefined
  }

  public constructor(options: ServerOptions) {
    this.settings = Object.assign(this.settings, options)
  }
}

When a new instance of the class Server is created, I want to require a typeof MatchMaker to be set for matchMaker when passing the options to the constructor. I don't want to allow undefined | null or anything else to be passed to the constructor, however I need to have some value as the default, and when I use undefined which will get overridden, I get an error:

Type 'undefined' is not assignable to type 'MatchMakerType'.

What can I do to set up a default that will be overridden?

Jonas Wilms · Accepted Answer · 2018-04-20 14:54:06Z

3

You could use Partial, to allow not defined properties in Server.settings:

 public readonly settings: Partial<ServerOptions> = {  }

answered Apr 20, 2018 at 14:54

Jonas Wilms

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