Types are displayed differently when developing with clasp compared to web Apps Script editor

[Miss Adorable]

For instance, interface GoogleAppsScript.Slides.Presentation (it is displayed in such a way in VS Code) is shown as SlidesApp.Presentation in web editor. Can somebody explain why it happens? Also, when I type GoogleApps word nothing is completed in the web editor, while in VS Code with @types/google-apps-script installed GoogleAppsScript is suggested. It's a little confusing.