Using optional chaining operators instead of logical and operators.

optional-chaining.js

// Before
const postsByAuthor = (posts) => {
  return this.posts.filter(
    (post) => post.author && post.author.fields.name == this.teamMember.name
  );
},
      
// After
const postsByAuthor = (posts) => {
  return this.posts.filter(
    (post) => post.author?.fields.name == this.teamMember.name
  );
},