Clash of the Titans: LSP vs PSI (VS Code vs IntelliJ)

Let's look inside the IDE and analyze the mechanisms which let us get help in writing code (in the context of JavaScript and TypeScript). Let's look at the capabilities of the two main platforms for creating extensions - not only in relation to working with code, but also in relation to user interaction. Let's try to understand how difficult it is to write a plugin for each of the platforms that h with a specific JS framework. The talk will be of interest to those who are thinking about releasing a plugin for their library / framework, as well as to those who wanted to understand how it works and why sometimes everything slows down so much.