INSIDE IMESSAGE-EXPORTER: REVERSE ENGINEERING APPLE'S TYPEDSTREAM FORMAT

Summary from the TLDR Web Dev newsletter

A developer reverse-engineered Apple's undocumented typedstream binary serialization format used in iMessage's attributedBody BLOB, which stores rich text and formatting data. In this post, they explain how they deciphered the format's structure, including type tags, indicators, and object caching, to create imessage-exporter, a tool that can extract and represent this data in a platform-agnostic way.