Using field policies to rewrite dates

Next, let's display the dates of both the post and comments in a human-readable format. We will do this in the time ago format, which is commonly used in social network apps:

1. Install the following package in your client's project:

   npm install timeago.js

2. Open the src/app/cache.ts file and import the library:

   import * as timeago from 'timeago.js';

3. Add two field policies for the Post.createdAt and Comment.createdAt fields. Let's start with the Post type:

   Post: {
       fields: {
           createdAt: {
               read(createdAt) {
                   return timeago.format(createdAt)
               }
           }
      ...