React + Typescript: Property * is missing in type *
comment.tsx(30,5): error TS2324: Property 'data' is missing in type 'MyProps'. comment.tsx(31,5): error TS2324: Property 'data' is missing in type 'MyProps'. main.tsx(20,17): error TS2324: Property 'author' is missing in type 'MyProps'. main.tsx(27,18): error TS2324: Property 'author' is missing in type 'MyProps'.
You are probably confusing MyProps for CommentList (does not contain .author) and MyProps for Comment (does not contain .data).
Better if you use different Prop interfaces for the two components.