A convenience module for importing Content classes when developing with TypeScript. For example, rather than importing content elements one at a time like this:

import TextContent = require("esri/popup/content/TextContent");
import MediaContent = require("esri/popup/content/MediaContent");
import FieldsContent = require("esri/popup/content/FieldsContent");
import AttachmentsContent = require("esri/popup/content/AttachmentsContent");

You can use this module to import them on a single line:

import { TextContent, MediaContent, FieldsContent, AttachmentsContent } from "esri/popup/content";

This module also allows you to implement type guards on the content elements, making your code smarter.

import { Content } from "esri/popup/content";

function logContentElement(content: Content): void {
  if (content.type === "media") {
    console.log("Content type is media");
  }
  else {
    // The compiler knows the content element must be `text | fields | media | attachment`
    console.log("The value is not a valid popup content element.")
  }
}