Eslint doesn't work with config option

[sarmong]

This is likely not a problem with null-ls, but with eslint. However, maybe you have a solution on how to fix it on my side, or do some workaround in null-ls, because opening an issue in eslint is futile.

Problem:

# This works fine
eslint -c ~/.config/.eslintrc.json test.js

# This doesn't work. Notice the quotes. For some reason, eslint considers it a relative path
# and according to the error, it looks in /home/username/Documents/~/.config/.eslintrc.json
eslint -c "~/.config/.eslintrc.json" test.js

In my null-ls I have the following, which doesn't work and results in the same path as the second example above.

    null_ls.builtins.diagnostics.eslint.with({
      extra_args = { "-c", "~/.config/.eslintrc.json" },
      prefer_local = "node_modules/.bin",
    }),

I am wondering if there is a way to get the expected result?

[jose-elias-alvarez]

Try using vim.fn.expand() to expand ~ into a full path:

    null_ls.builtins.diagnostics.eslint.with({
      extra_args = { "-c", vim.fn.expand("~/.config/.eslintrc.json") },
      prefer_local = "node_modules/.bin",
    }),

[sarmong]

Hm, I noticed that if I run command with -c in a console, I get an error saying Failed to read JSON file at /home/user/docs/projects/~/.config/.eslintrc.json

However, if I add either of this, the error in the popup window in neovim doesn't have this messages. there is just a regular message saying ESLint couldn't find a configuration file. As if the options set in null_ls are ignored

      extra_args = { "-c", "~/.config/.eslintrc.json" },
      extra_args = { "-c", vim.fn.expand("~/.config/.eslintrc.json") },

[jose-elias-alvarez]

The 2 commands you posted originally are not equivalent because your shell will expand the unquoted path, so ~ is expanded into your home directory. vim.fn.expand() replicates this, and what I posted works on my end, so I can't say for sure what's going on. Take a look at your debug log output to see what arguments ESLint is actually receiving and see if there's any clues there.