Typescript接口默认会在构造函数中被覆盖

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 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?

Answer 1

您可以使用Partial ，以允许Server.settings未定义的属性：

 public readonly settings: Partial<ServerOptions> = {  }