Yet another report of 'missing or incorrect' config file with eslint.

[yoshikiohshima]

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Checklist

• I have searched existing issues and StackOverflow for solutions.
• I have read the [Flycheck manual][].
• I have read the [Troubleshooting Guide][].
• I have checked my issue has not been reported yet.

Problem description

I get "config file: missing or incorrect" error with flycheck-verify-setup. Besides I'd like to know how to fix the problem, I'd like to know what it actually means. I've read other reports about executable-path, but it is a bit hard to know that that is the issue. When I do M-! (shell-command) and run eslint index.js it property checks the errors and styles in the file. If I run the shell-mode and run stuff like eslint --print-config index.js; echo $?, I get 0 so it is not that an error code is returned. The following is the content in the buffer when I run M-x flycheck-verity-setup. It does find the executable (and the one I want to use), and it is consistent with the one I run from the shell-mode. It's just I cannot say which file is missing or incorrect from this output.

I am on Emacs 26.2 on MacOS. Eslint is installed globally.

Syntax checkers for buffer index.js in js-mode:

javascript-eslint (disabled)
- may enable: Automatically disabled!
- executable: Found at /usr/local/bin/eslint
- config file: missing or incorrect

javascript-jshint (disabled)
- may enable: Automatically disabled!
- executable: Not found
- configuration file: Not found

javascript-standard (disabled)
- may enable: Automatically disabled!
- executable: Not found

Flycheck Mode is enabled. Use C-u C-c ! x to enable disabled
checkers.

---

Flycheck version: 32snapshot (package: 20181126.1002)
Emacs version: 26.2
System: x86_64-apple-darwin18.7.0
Window system: ns

[fmdkdd]

If I run the shell-mode and run stuff like eslint --print-config index.js; echo $?, I get 0

Have you tried with eslint --print-config BUFFER-FILE-NAME? This is what the code does.

[yoshikiohshima]

Have you tried with eslint --print-config BUFFER-FILE-NAME? This is what the code does.

BUFFER-FILE-NAME here is the full path for index.js in my example, right? In this example, it is /Users/ohshima/src/react/my-app/src/index.js, and it also runs fine (it prints out the configuration in JSON format and finishes with error code 0). Or are you suggesting to see the printed result? It does not seem to have any particular problem in the result.

Thank you!

[yoshikiohshima]

I see that flycheck-eslint-config-exists-p looks like:

(defun flycheck-eslint-config-exists-p ()
"Whether there is a valid eslint config for the current buffer."
(let* ((executable (flycheck-find-checker-executable 'javascript-eslint))
(exitcode (and executable (call-process executable nil nil nil
"--print-config" "."))))
(eq exitcode 0)))

. If I follow this and run "eslint --print-config .", it certainly produces an error with a message:

The '--print-config' CLI option requires a path to a source code file rather than a directory.
See also: https://eslint.org/docs/user-guide/command-line-interface#--print-config

Maybe this is the problem?

[yoshikiohshima]

FYI, eslint has changed to throw an error when "." is used for --print-config:
eslint/eslint#11874

[cpitclaudel]

I think your Flycheck is outdated: https://github.com/flycheck/flycheck/blob/master/flycheck.el#L8689

[yoshikiohshima]

ah, yes. I thought I got a new version when I switched Emacs but then I was using the old one in the end. Thanks for the suggestion!