Conventions used

There are a number of text conventions used throughout this book.

Code in text: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "For example, the client would not need to add another service object with an ApiServiceV2 type."

A block of code is set as follows:

export class EventCreator implements EventSender {
  sendEvent(action: string): void {
    console.log("Event Created: ", action);
  }
}

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

export class Client {
  actionCreator: ActionSender;
  call() {
    this.actionCreator = new ActionCreator();
    this.actionCreator.sendAction("Hello");
    this.actionCreator = new EventAdapter();
    this.actionCreator.sendAction("Another Action");
  }
}

Any command-line input or output is written as follows:

Property 'name' has no initializer and is not definitely assigned in the constructor.ts(2564)
Property 'id has no initializer and is not definitely assigned in the constructor.ts(2564)

Bold: Indicates a new term, an important word, or words that you see on screen. For instance, words in menus or dialog boxes appear in bold. Here is an example: "Once installed, you want to open the book projects folder using the following menu dialog: File | Open | (Project)."

Tips or important notes

Appear like this.