Mode specific variables

Tags: emacs

I wanted to set the flycheck-check-syntax-automatically variable to a value only for typescript-mode without that affecting buffers in other modes for which the variable would retain its original, globally set value.

For this, I used the setq-local macro.

This does two things:

1. creates a buffer local binding for the variable name (eg make-local-variable).
2. and sets a buffer local value for that variable.

For a full explanation, see https://www.gnu.org/software/emacs/manual/html_node/elisp/Creating-Buffer_002dLocal.html

So, in the end, I used a mode hook:

(add-hook 'typescript-mode-hook
          (lambda()
            (setq-local flycheck-check-syntax-automatically '(mode-enabled save new-line))))