Symbol's function definition is void: flycheck-define-checker · Issue #567 · flycheck/flycheck

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I ran into an issue trying to set up jsxhint checker (following these instructions ). The following code runs fine when pasted into a buffer and executed with eval-region:

(flycheck-define-checker jsxhint-checker
  "A JSX syntax and style checker based on JSXHint."
  :command ("jsxhint" "--harmony" source)
  :error-patterns
  ((error line-start (1+ nonl) ": line " line ", col " column ", " (message) line-end))
  :modes (web-mode))
and syntax checking works as expected. However, when I add this code to init.el and restart emacs I am getting an error:
Warning (initialization): An error occurred while loading `/home/itkach/.emacs.d/init.el':
Symbol's function definition is void: flycheck-define-checker
and with --debug-init:
Debugger entered--Lisp error: (void-function flycheck-define-checker)
  (flycheck-define-checker jsxhint-checker "A JSX syntax and style checker based on JSXHint." :command ("jsxhint" "--harmony" source) :error-patterns ((error line-start (1+ nonl) ": line " line ", col " column ", " (message) line-end)) :modes (web-mode))
  eval-buffer(#<buffer  *load*> nil "/home/itkach/.emacs.d/init.el" nil t)  ; Reading at buffer position 3081
  load-with-code-conversion("/home/itkach/.emacs.d/init.el" "/home/itkach/.emacs.d/init.el" t t)
  load("/home/itkach/.emacs.d/init" t t)
  #[0 "�\205\262�   \306=\203��\307�\310Q\202;� \311=\204��\307�\312Q\202;�\313\307\314\315#\203*�\316\202;�\313\307\314\317#\203:�\320\nB�\321\202;�\316\322�\323�\322\211#\210�\322=\203a�\324\325\326\307�\327Q!\"\323�\322\211#\210�\322=\203`���\210�\203\243�\330�!\331\232\203\243�\332�!\211\333P\334�!\203}�\211\202\210�\334�!\203\207��\202\210�\314\262��\203\241�\335��\"\203\237�\336\337��#\210\340\341!\210��\266�\f?\205\260�\314�\323\342\322\211#)\262�\207" [init-file-user system-type delayed-warnings-list user-init-file inhibit-default-init inhibit-startup-screen ms-dos "~" "/_emacs" windows-nt "/.emacs" directory-files nil "^\\.emacs\\(\\.elc?\\)?$" "~/.emacs" "^_emacs\\(\\.elc?\\)?$" (initialization "`_emacs' init file is deprecated, please use `.emacs'") "~/_emacs" t load expand-file-name "init" file-name-as-directory "/.emacs.d" file-name-extension "elc" file-name-sans-extension ".el" file-exists-p file-newer-than-file-p message "Warning: %s is newer than %s" sit-for 1 "default"] 7 "\n\n(fn)"]()
  command-line()
  normal-top-level()
Flycheck version: 0.23alpha (package: 20150112.1039)
I had the same error with an earlier version and upgraded to latest from MELPA which did not fix it.

I also tried setting up the checker in after-init-hook hook - same issue.
Here's my init.el: https://bitbucket.org/itkach/emacsd/src/90ae3c36178080aa77a8ec3ef72d1c280a825fc0/init.el?at=default
Flycheck version: 0.23alpha (package: 20150112.1039)

GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.10.7)

of 2014-03-07 on lamiak, modified by Debian