From @Rosetjau on March 16, 2018 13:58

When running the formatter from command line via mix format the formatter respects the configuration that is imported from dependencies. The same does not seem to apply to the "format on save" feature in Visual Studio Code.

I have set up an example repository to reproduce this issue. Steps to reproduce:

1. Clone the repo
2. Run mix format from command line. Notice that the formatter exits without changing the schema.ex file, because the .formatter.exs file imports the configuration that is exported by Absinthe
3. Open the project with Visual Studio Code, edit the workspace settings to enable "editor.formatOnSave", open the schema.ex file and save it
4. Upon saving the file the formatter will add parentheses to the schema.ex file, even if the Absinthe formatter configuration declares those functions/macros as locals_without_parens

Copied from original issue: JakeBecker/vscode-elixir-ls#58

@zachdaniel Issues should be filed on the new repo (https://github.com/elixir-lsp/elixir-ls/). Although this one sounds like a duplicate of https://github.com/elixir-lsp/elixir-ls/issues/402