Message Passing

Message Passing Hell

MPH for short

The browser extension has many .js scripts that run in different contexts, so they need to send messages to each other to communicate. There are currently four distinct execution contexts:

1. Index aka index.js
2. Content aka contentScript.js
3. Background aka background.js
4. Popup aka popup.js

Overview

These are all of the ways you can send a message in Codeforces++. There's no direct index -> background communication, nor content -> all tabs, etc.

Messages

get storage

• who sends it: index
• params: key
• expected result: { [key]: {...} }

set storage

• who sends it: index
• params: key, value
• expected result: undefined. It's only there to differentiate between a bg result and an error type