Set intero as default in spacemacs

Question

How do I set intero-mode as default for my Haskell buffers instead of haskell-mode?

Answer 1

I looked it up and intero-mode is a minor mode, not a major mode. You probably want to be using that with haskell-mode, not instead of haskell-mode.

The library also contains a globalized minor mode which knows what to do, so you could just add the following to your init file:

(with-eval-after-load 'haskell-mode
  (require 'intero)
  (intero-global-mode 1))

See also C-hf intero-mode-maybe RET which is used by the globalized mode to decide whether or not to enable intero-mode in any given buffer.

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FYI if intero-mode had been a major mode, then the answer to your stated question would have been:

(add-to-list 'auto-mode-alist '("\\.hs\\'" . intero-mode))

but in this case you don't actually want to do that.