Comment by __jonas

Here are some examples:

- ESLint, the most commonly used linter in the JavaScript ecosystem uses a JavaScript file for configuration (eslint.config.mjs), so if you open a JS project and want your editor to show you warnings from the linter, an extension needs to run that JS

- In Elixir, project configuration is written in code (mix.exs), so if you open an Elixir project and want the language server to provide you with hints (errors, warnings and such), the language server needs to execute that code to get the project configuration. More generally it will probably want to expand macros in the project, which is also code execution.

- For many languages in general, in order to analyze code, editor extensions need to build the project, and this often results in code execution (like through macros or build scripts like build.rs, which I believe rust-analyzer executes)