Typescript Nuances

A Partial makes everything optional.
typescript 
type FullContent = Partial<{
  fullMarkdownTxt: string;
  fullHtmlTxt: string;
  fullPlainText: string;
  fullRichText: string;
  pathToFullContent: string;
  urlToRemoteFullContent: string;
}> | string | null | undefined;
typescript 
type SocialLink = import('../ui/SocialIcons.astro').SocialLink;
This is called a Type-Only Import in TypeScript. Here's what it does:
  1. Imports a Type: It imports just the SocialLink type from the SocialIcons.astro file, not the actual component or its runtime code.
  2. No Runtime Impact: This import is removed during compilation and doesn't affect the final JavaScript bundle.
  3. Type Safety: It allows TypeScript to understand the shape of the SocialLink type for type checking.
  4. Alternative Syntax: It's similar to import type { SocialLink } from '../ui/SocialIcons.astro'  but is more concise for single-type imports.
In this case, we're using it to ensure the socialLinks prop in the Footer.astro component matches the expected type from the SocialIcons component, maintaining type safety between components.