Supported Languages

This document lists all programming and markup languages which Flycheck supports.

Note

Extensions may provide support for additional languages or add deeper integration with existing languages.

Take a look at the list of extensions to see what the community can offer to you.

Each language has one or more syntax checkers whose names follow a convention of language-tool. All syntax checkers are listed in the order they would be applied to a buffer, with all available options. For more information about a syntax checker open Emacs and use flycheck-describe-checker to view the docstring of the syntax checker. Likewise, you may use describe-variable to read the complete docstring of any option.

Ada

ada-gnat

Check ADA syntax and types with GNAT.

defcustom flycheck-gnat-args

A list of additional options.

defcustom flycheck-gnat-include-path

A list of include directories. Relative paths are relative to the path of the buffer being checked.

defcustom flycheck-gnat-language-standard

The language standard to use as string.

defcustom flycheck-gnat-warnings

A list of additional warnings to enable. Each item is the name of a warning category to enable.

AsciiDoc

asciidoctor

Check AsciiDoc with the default Asciidoctor backend.

asciidoc

Check AsciiDoc with the standard AsciiDoc processor.

Awk

awk-gawk

Check Awk with gawk.

Bazel

bazel-buildifier

Check Bazel with buildifier.

C/C++

Flycheck checks C and C++ with either c/c++-clang or c/c++-gcc, and then with c/c++-cppcheck.

c/c++-clang
c/c++-gcc

Check C/C++ for syntax and type errors with Clang or GCC respectively.

Note

c/c++-gcc requires GCC 4.4 or newer.

defcustom flycheck-clang-args
defcustom flycheck-gcc-args

A list of additional arguments for c/c++-clang and c/c++-gcc respectively.

defcustom flycheck-clang-blocks

Whether to enable blocks in c/c++-clang.

defcustom flycheck-clang-definitions
defcustom flycheck-gcc-definitions

A list of additional preprocessor definitions for c/c++-clang and c/c++-gcc respectively.

defcustom flycheck-clang-include-path
defcustom flycheck-gcc-include-path

A list of include directories for c/c++-clang and c/c++-gcc respectively, relative to the file being checked.

defcustom flycheck-clang-includes
defcustom flycheck-gcc-includes

A list of additional include files for c/c++-clang and c/c++-gcc respectively, relative to the file being checked.

defcustom flycheck-clang-language-standard
defcustom flycheck-gcc-language-standard

The language standard to use in c/c++-clang and c/c++-gcc respectively as string, via the -std option.

defcustom flycheck-clang-ms-extensions

Whether to enable Microsoft extensions to C/C++ in c/c++-clang.

defcustom flycheck-clang-no-exceptions
defcustom flycheck-gcc-no-exceptions

Whether to disable exceptions in c/c++-clang and c/c++-gcc respectively.

defcustom flycheck-clang-no-rtti
defcustom flycheck-gcc-no-rtti

Whether to disable RTTI in c/c++-clang and c/c++-gcc respectively, via -fno-rtti.

defcustom flycheck-clang-standard-library

The name of the standard library to use for c/c++-clang, as string.

defcustom flycheck-gcc-openmp

Whether to enable OpenMP in c/c++-gcc.

defcustom flycheck-clang-pedantic
defcustom flycheck-gcc-pedantic

Whether to warn about language extensions in c/c++-clang and c/c++-gcc respectively.

defcustom flycheck-clang-pedantic-errors
defcustom flycheck-gcc-pedantic-errors

Whether to error on language extensions in c/c++-clang and c/c++-gcc respectively.

defcustom flycheck-clang-warnings
defcustom flycheck-gcc-warnings

A list of additional warnings to enable in c/c++-clang and c/c++-gcc respectively. Each item is the name of a warning or warning category for -W.

c/c++-cppcheck

Check C/C++ for semantic and stylistic issues with cppcheck.

defcustom flycheck-cppcheck-checks

A list of enabled checks. Each item is the name of a check for the --enable option.

defcustom flycheck-cppcheck-inconclusive

Whether to enable inconclusive checks. These checks may yield more false positives than normal checks.

Note

This option requires cppcheck 1.54 or newer.

defcustom flycheck-cppcheck-include-path

A list of include directories. Relative paths are relative to the file being checked.

defcustom flycheck-cppcheck-standards

The C, C++ and/or POSIX standards to use via one or more --std= arguments.

defcustom flycheck-cppcheck-suppressions

The cppcheck suppressions list to use via one or more --suppress= arguments.

defcustom flycheck-cppcheck-suppressions-file

The cppcheck suppressions file to use via the --suppressions-list= argument.

CFEngine

cfengine

Check syntax with CFEngine.

Chef

chef-foodcritic

Check style in Chef recipes with foodcritic.

defcustom flycheck-foodcritic-tags

A list of tags to select.

Coffeescript

Flycheck checks Coffeescript syntax with coffee and then lints with coffee-coffeelint.

coffee

Check syntax with the Coffeescript compiler.

coffee-coffeelint

Lint with Coffeelint.

defcustom flycheck-coffeelintrc

Configuration file for this syntax checker. See Configuration files.

Coq

coq

Check and proof with the standard Coq compiler.

CSS

css-csslint

Check syntax and style with CSSLint.

css-stylelint

Syntax-check and lint CSS with stylelint.

defcustom flycheck-stylelintrc

Configuration file for this syntax checker. See Configuration files.

defcustom flycheck-stylelint-quiet

Whether to run stylelint in quiet mode via --quiet.

CUDA C/C++

cuda-nvcc

Checks syntax for CUDA C/C++ using the nvcc nvcc compiler bundled in the NVIDIA Toolkit.

CUDA C/C++ uses whichever system compiler you have configured, gcc/clang etc, but will sanitise error messages into a standardised format that can be picked up via flycheck. Corner cases may cause some odd behavior.

defcustom flycheck-cuda-language-standard

The C or C++ Language standard that you want the CUDA compiler to enforce.

defcustom flycheck-cuda-includes

A list of cuda includes.

defcustom flycheck-cuda-include-path

A list of include directories for nvcc.

defcustom flycheck-cuda-definitions

Additional preprocessor definitions for nvcc. Is passed unaltered to both GPU compiler and underlying C/C++ compiler.

CWL

cwl

Syntax check with (Schema Salad).

defcustom flycheck-cwl-schema-path

A path for the schema file for Common Workflow Language.

D

d-dmd

Check syntax and types with (DMD).

Note

This syntax checker requires DMD 2.066 or newer.

defcustom flycheck-dmd-include-path

A list of include directories.

defcustom flycheck-dmd-args

A list of additional arguments.

See also

flycheck-d-unittest
Flycheck extension which provides a syntax checker to run D unittests on the fly and report the results with Flycheck.

Dockerfile

dockerfile-hadolint

Check syntax and code style with hadolint

Elixir

elixir-credo

Check code style with credo

defcustom flycheck-elixir-credo-strict

When non-nil, run credo in strict mode, via --strict.

Emacs Lisp

Flycheck checks Emacs Lisp with emacs-lisp and then with emacs-lisp-checkdoc.

emacs-lisp

Check syntax with the built-in byte compiler.

defcustom flycheck-emacs-lisp-load-path

The load path as list of strings. Relative directories are expanded against the default-directory of the buffer being checked.

defcustom flycheck-emacs-lisp-initialize-packages

Whether to initialize Emacs’ package manager with package-initialize before checking the buffer. If set to auto (the default), only initialize the package managers when checking files under user-emacs-directory.

defcustom flycheck-emacs-lisp-package-user-dir

The package directory as string. Has no effect if flycheck-emacs-lisp-initialize-packages is nil.

defcustom flycheck-emacs-lisp-check-declare

If non-nil, also check declare-function forms using check-declare-file.

emacs-lisp-checkdoc

Check Emacs Lisp documentation conventions with checkdoc.

See also

Documentation Tips(elisp)
Information about documentation conventions for Emacs Lisp.
purcell/flycheck-package
Flycheck extension which adds a syntax checker to check for violation of Emacs Lisp library headers and packaging conventions.
Library Headers(elisp)
Information about library headers for Emacs Lisp files.

Ember Templates

ember-template

Check your Ember templates with ember-template-lint

defcustom flycheck-ember-template-lintrc

Configuration file for this syntax checker. See Configuration files.

Erlang

Flycheck checks Erlang with erlang-rebar3 in rebar projects and erlang otherwise.

erlang

Check Erlang with the standard Erlang compiler.

defcustom flycheck-erlang-include-path

A list of include directories.

defcustom flycheck-erlang-library-path

A list of library directories.

erlang-rebar3

Check Erlang with the rebar3 build tool.

defcustom flycheck-erlang-rebar3-profile

The profile to use when compiling, e.g. “default” or “test”. The default value is nil which will use the test profile in test directories, the eqc profile in eqc directories and the default profile otherwise.

ERuby

eruby-erubis

Check ERuby with erubis.

eruby-ruumba

Check syntax and lint with Ruumba.

Note

This syntax checker requires Ruumba 0.1.7 or newer.

defcustom flycheck-ruumba-lint-only

Whether to suppress warnings about style issues, via the --lint option.

defcustom flycheck-ruumbarc

Configuration file for this syntax checker. See Configuration files.

Fortran

fortran-gfortran

Check Fortran syntax and type with GFortran.

defcustom flycheck-gfortran-args

A list of additional arguments.

defcustom flycheck-gfortran-include-path

A list of include directories. Relative paths are relative to the file being checked.

defcustom flycheck-gfortran-language-standard

The language standard to use via the -std option.

defcustom flycheck-gfortran-layout

The source code layout to use. Set to free or fixed for free or fixed layout respectively, or nil (the default) to let GFortran automatically determine the layout.

defcustom flycheck-gfortran-warnings

A list of warnings enabled via the -W option.

Go

Flycheck checks Go with the following checkers:

  1. go-gofmt
  2. go-golint
  3. go-vet
  4. go-build or go-test
  5. go-errcheck
  6. go-unconvert
  7. go-staticcheck
go-gofmt

Check Go syntax with gofmt.

go-golint

Check Go code style with Golint.

go-vet

Check Go for suspicious code with vet.

defcustom flycheck-go-vet-print-functions

A list of print-like functions to check calls for format string problems.

defcustom flycheck-go-build-tags

A list of build tags.

go-build

Check syntax and type with the Go compiler.

Note

This syntax checker requires Go 1.6 or newer.

defcustom flycheck-go-build-install-deps

Whether to install dependencies while checking with go-build or go-test

defcustom flycheck-go-build-tags

See flycheck-go-build-tags

go-test

Check syntax and types of Go tests with the Go compiler.

Note

This syntax checker requires Go 1.6 or newer.

defcustom flycheck-go-build-install-deps

See flycheck-go-build-install-deps.

defcustom flycheck-go-build-tags

See flycheck-go-build-tags

go-errcheck

Check for unhandled error returns in Go with errcheck.

Note

This syntax checker requires errcheck build from commit 8515d34 (Aug 28th, 2015) or newer.

defcustom flycheck-go-build-tags

See flycheck-go-build-tags

go-unconvert

Check for unnecessary type conversions with unconvert.

go-staticcheck

Perform static analysis and code linting with staticcheck, the successor to megacheck.

defcustom flycheck-go-version

staticcheck explicitly supports the last two releases of Go, but supports targeting older versions. Go versions should be specified like, “1.6”, or, “1.11.4”.

Groovy

groovy

Check syntax using the Groovy compiler.

Haml

haml

Check syntax with the Haml compiler.

Handlebars

handlebars

Check syntax with the Handlebars compiler.

Haskell

Flycheck checks Haskell with haskell-stack-ghc (in Stack projects) or haskell-ghc, and then with haskell-hlint.

See also

flycheck-haskell
Flycheck extension to configure Flycheck’s Haskell checkers from the metadata, with support for Cabal sandboxes.
flycheck-hdevtools
Flycheck extension which adds an alternative syntax checker for GHC using hdevtools.
haskell-stack-ghc
haskell-ghc

Check syntax and type GHC. In Stack projects invoke GHC through Stack to bring package dependencies from Stack in.

defcustom flycheck-ghc-args

A list of additional arguments.

defcustom flycheck-ghc-no-user-package-database

Whether to disable the user package database (only for haskell-ghc).

defcustom flycheck-ghc-stack-use-nix

Whether to enable Nix support for Stack (only for haskell-stack-ghc).

defcustom flycheck-ghc-stack-project-file

Allows to override the default stack.yaml file for Stack, via --stack-yaml (only for haskell-stack-ghc).

defcustom flycheck-ghc-package-databases

A list of additional package databases for GHC (only for haskell-ghc). Each item points to a directory containing a package directory, via -package-db.

defcustom flycheck-ghc-search-path

A list of module directories, via -i.

defcustom flycheck-ghc-language-extensions

A list of language extensions, via -X.

haskell-hlint

Lint with hlint.

defcustom flycheck-hlint-args

A list of additional arguments.

defcustom flycheck-hlint-language-extensions

A list of language extensions to enable.

defcustom flycheck-hlint-ignore-rules

A list of rules to ignore.

defcustom flycheck-hlint-hint-packages

A list of additional hint packages to include.

defcustom flycheck-hlintrc

Configuration file for this syntax checker. See Configuration files.

HTML

html-tidy

Check HTML syntax and style with Tidy HTML5.

defcustom flycheck-tidyrc

Configuration file for this syntax checker. See Configuration files.

Javascript

Flycheck checks Javascript with one of javascript-eslint or javascript-jshint.

Alternatively javascript-standard is used instead all of the former ones.

javascript-eslint

Check syntax and lint with ESLint.

Note

Flycheck automatically disables this syntax checker if eslint cannot find a valid configuration file for the current buffer.

defcustom flycheck-eslint-args

A list of additional arguments that are passed to eslint.

defcustom flycheck-eslint-rules-directories

A list of directories with custom rules.

javascript-jshint

Check syntax and lint with JSHint.

defcustom flycheck-jshint-extract-javascript

Whether to extract Javascript from HTML before linting.

defcustom flycheck-jshintrc

Configuration file for this syntax checker. See Configuration files.

javascript-standard

Check syntax and code style with Standard or Semistandard.

JSON

Flycheck checks JSON with json-jsonlint, json-python-json, or json-jq.

json-jsonlint

Check JSON with jsonlint.

json-python-json

Check JSON with Python’s built-in json module.

json-jq

Check JSON with jq.

This checker accepts multiple consecutive JSON values in a single input, which is useful for jsonlines data.

Jsonnet

jsonnet

Checks Jsonnet with jsonnet.

Less

less

Check syntax with the Less compiler.

Note

This syntax checker requires lessc 1.4 or newer.

less-stylelint

Syntax-check and lint Less with stylelint.

defcustom flycheck-stylelintrc

Configuration file for this syntax checker. See Configuration files.

defcustom flycheck-stylelint-quiet

Whether to run stylelint in quiet mode via --quiet.

LLVM

llvm-llc

Check syntax with llc.

Lua

Flycheck checks Lua with lua-luacheck, falling back to lua.

lua-luacheck

Check syntax and lint with Luacheck.

defcustom flycheck-luacheckrc

Configuration file for this syntax checker. See Configuration files.

defcustom flycheck-luacheck-standards

The luacheck standards to use via one or more --std arguments.

lua

Check syntax with the Lua compiler.

Markdown

markdown-markdownlint-cli

Check Markdown with markdownlint-cli.

defcustom flycheck-markdown-markdownlint-cli-config

Configuration file for this syntax checker. See Configuration files.

markdown-mdl

Check Markdown with markdownlint.

defcustom flycheck-markdown-mdl-rules

A list of enabled rules.

defcustom flycheck-markdown-mdl-tags

A list of enabled rule tags.

defcustom flycheck-markdown-mdl-style

Configuration file for this syntax checker. See Configuration files.

Nix

nix

Check Nix with nix-instantiate.

nix-linter

Check Nix with nix-linter.

Opam

opam

Check Opam configuration files with opam lint.

Perl

Flycheck checks Perl with perl and perl-perlcritic.

perl

Check syntax with the Perl interpreter.

defcustom flycheck-perl-include-path

A list of include directories, relative to the file being checked.

defcustom flycheck-perl-module-list

A list of module names to implicitly use.

perl-perlcritic

Lint and check style with Perl::Critic.

defcustom flycheck-perlcritic-severity

The severity level as integer for the --severity.

defcustom flycheck-perlcritic-theme

The theme expression, passed as the --theme to perlcritic.

defcustom flycheck-perlcriticrc

Configuration file for this syntax checker. See Configuration files.

PHP

Flycheck checks PHP with php, php-phpmd and php-phpcs.

php

Check syntax with PHP CLI

php-phpmd

Lint with PHP Mess Detector.

defcustom flycheck-phpmd-rulesets

A list of rule sets. Each item is either the name of a default rule set, or the path to a custom rule set file.

php-phpcs

Check style with PHP Code Sniffer.

Note

This syntax checker requires PHP Code Sniffer 2.6 or newer.

defcustom flycheck-phpcs-standard

The coding standard, either as name of a built-in standard, or as path to a standard specification.

Processing

processing

Check syntax using the Processing compiler.

Protobuf

protobuf-protoc

Check syntax using the protoc compiler.

defcustom flycheck-protoc-import-path

A list of directories to resolve import directives. Relative paths are relative to the path of the buffer being checked.

protobuf-prototool

Lint with prototool.

Pug

pug

Check syntax using the Pug compiler.

Puppet

Flycheck checks Puppet with puppet-parser and lints with puppet-lint.

puppet-parser

Check syntax with the Puppet compiler.

puppet-lint

Link with Puppet Lint.

defcustom flycheck-puppet-lint-disabled-checks

A list of checks to disable.

defcustom flycheck-puppet-lint-rc

Configuration file for this syntax checker. See Configuration files.

Python

Flycheck checks Python with python-flake8 or python-pylint, and falls back to python-pycompile if neither of those is available.

All Python checkers are invoked indirectly using python -c ... (rather than a direct call to flake8 or pylint) to make it easier to switch between Python 2 and 3. For example, you can use (setq flycheck-python-pylint-executable "python3") to run pylint using Python 3, or (defvaralias 'flycheck-python-flake8-executable 'python-shell-interpreter) to run flake8 through the executable pointed to by python-shell-interpreter.

Note

If Flycheck complains about a missing Python checker, make sure that the checker is reachable from sys.path, using e.g. python -m pylint: often, the issue is that the checker is installed globally but not in the current virtualenv. Alternatively, you can invoke the checker script directly, with (setq flycheck-python-pylint-executable "pylint").

See also

flycheck-pyflakes
Flycheck extension which adds a syntax checker using Pyflakes.
msherry/flycheck-pycheckers
Flycheck extension which can use multiple checkers simultaneously – including pyflakes, pep8, flake8, pylint, and mypy 2/3.
python-flake8

Check syntax and lint with flake8.

Note

This syntax checker requires flake8 3.0 or newer.

defcustom flycheck-flake8-error-level-alist

An alist mapping Flake8 error IDs to Flycheck error levels.

defcustom flycheck-flake8-maximum-complexity

The maximum McCabe complexity allowed for methods.

defcustom flycheck-flake8-maximum-line-length

The maximum length of lines.

defcustom flycheck-flake8rc

Configuration file for this syntax checker. See Configuration files.

python-pyright

Type check python with pyright.

Note

This syntax checker requires pyright.

python-mypy

Type check python with mypy.

Note

This syntax checker requires mypy 0.580 or newer.

defcustom flycheck-python-mypy-config

Configuration file for this syntax checker. See Configuration files.

defcustom flycheck-python-mypy-cache-dir

Directory used to write .mypy_cache directories.

Set to null-device to disable writing cache directories entirely.

python-pylint

Check syntax and lint with Pylint.

Note

This syntax checker requires Pylint 1.0 or newer.

defcustom flycheck-pylint-use-symbolic-id

Whether to report symbolic (e.g. no-name-in-module) or numeric (e.g. E0611) message identifiers.

defcustom flycheck-pylintrc

Configuration file for this syntax checker. See Configuration files.

python-pycompile

Check syntax with Python’s byte compiler (see py_compile).

R

r-lintr

Check syntax and lint with lintr.

defcustom flycheck-lintr-caching

Whether to enable caching in lintr. On by default; it is not recommended to disable caching unless it causes actual problems.

defcustom flycheck-lintr-linters

Linters to use as a string with an R expression which selects the linters to use.

Racket

racket

Check syntax with raco expand from the compiler-lib package.

Note

This syntax checker needs the compiler-lib package.

RPM Spec

rpm-rpmlint

Lint with rpmlint.

reStructuredText

Flycheck checks reStructuredText with rst-sphinx in Sphinx projects and with rst otherwise.

rst-sphinx

Check documents with Sphinx.

Note

This syntax checker requires Sphinx 1.2 or newer.

defcustom flycheck-sphinx-warn-on-missing-references

Whether to emit warnings for all missing references.

rst

Check documents with docutils.

Ruby

Flycheck checks Ruby with ruby-rubocop, ruby-reek and ruby-rubylint, falling back to ruby or ruby-jruby for basic syntax checking if those are not available.

ruby-rubocop

Check syntax and lint with RuboCop.

Note

This syntax checker requires Rubocop 0.34 or newer.

defcustom flycheck-rubocop-lint-only

Whether to suppress warnings about style issues, via the --lint option.

defcustom flycheck-rubocoprc

Configuration file for this syntax checker. See Configuration files.

ruby-standard

Check syntax and lint with Ruby Standard.

Note

This syntax checker and ruby-rubocop are mutually exclusive, since Standard employs an opinionated rubocop config.

defcustom flycheck-rubocop-lint-only

See flycheck-rubocop-lint-only.

defcustom flycheck-ruby-standardrc

Configuration file for this syntax checker. See Configuration files.

ruby-reek

Check syntax and lint with reek.

defcustom flycheck-reekrc

Configuration file for this syntax checker. See Configuration files.

Note

flycheck-reekrc defaults to nil, because Reek can find its own configuration.

ruby-rubylint

Check syntax and lint with ruby-lint.

Note

This syntax checker requires ruby-lint 2.0.2 or newer.

defcustom flycheck-rubylintrc

Configuration file for this syntax checker. See Configuration files.

ruby

Check syntax with the Ruby interpreter.

ruby-jruby

Check syntax with the JRuby interpreter.

Rust

Flycheck checks Rust with rust-cargo in Cargo projects, or rust otherwise. For Cargo projects, you can also use the clippy linter with rust-clippy.

rust-cargo
rust
rust-clippy

Check syntax and types with the Rust compiler. In a Cargo project the compiler is invoked through cargo check to take Cargo dependencies into account.

rust-clippy has no configurable options.

Note

rust-cargo requires Rust 1.17 or newer. rust requires Rust 1.18 or newer. rust-clippy requires the nightly version of Rust.

See also

flycheck-rust
Flycheck extension to configure Rust syntax checkers according to the current Cargo project.
defcustom flycheck-rust-args

A list of additional arguments that are passed to rustc. This option is ignored by rust-cargo.

defcustom flycheck-cargo-check-args

A list of additional arguments passed to the cargo check subcommand.

defcustom flycheck-rust-check-tests

Whether to check test code in Rust.

defcustom flycheck-rust-crate-root

A path to the crate root for the current buffer, or nil if the current buffer is a crate by itself.

rust-cargo ignores this option as the crate root is given by Cargo.

defcustom flycheck-rust-crate-type

For rust-cargo, the target type as a string, one of lib, bin, example, test or bench. Can also be nil for projects with a single target.

For rust, the type of the crate to check, as a string for the --crate-type option.

defcustom flycheck-rust-binary-name

The name of the binary to pass to cargo check --TARGET-TYPE, as a string.

For rust-cargo, always required unless flycheck-rust-crate-type is lib or nil, in which case it is ignored.

Ignored by rust.

defcustom flycheck-rust-features

List of features to activate during build or check.

The value of this variable is a list of strings denoting features that will be activated to build the target to check. Features will be passed to cargo check --features=FEATURES.

Empty by default.

Ignored by rust.

defcustom flycheck-rust-library-path

A list of additional library directories. Relative paths are relative to the buffer being checked.

Sass/SCSS

Flycheck checks SASS with sass/scss-sass-lint, falling back to sass, and SCSS with scss-lint or scss-stylelint falling back to sass/scss-sass-lint first and then scss if neither is available.

scss-lint

Syntax-check and lint SCSS with SCSS-Lint.

Note

This syntax checker requires SCSS-Lint 0.43.2 or newer.

defcustom flycheck-scss-lintrc

Configuration file for this syntax checker. See Configuration files.

sass/scss-sass-lint

Syntax-check and lint Sass/SCSS with SASS-Lint.

defcustom flycheck-sass-lintrc

Configuration file for this syntax checker. See Configuration files.

scss-stylelint

Syntax-check and lint SCSS with stylelint.

defcustom flycheck-stylelintrc

Configuration file for this syntax checker. See Configuration files.

defcustom flycheck-stylelint-quiet

Whether to run stylelint in quiet mode via --quiet.

sass
scss

Check SASS and SCSS respectively with the SCSS compiler.

defcustom flycheck-sass-compass
defcustom flycheck-scss-compass

Whether to enable the Compass CSS framework with --compass.

Scala

Flycheck checks Scala with scala and scala-scalastyle.

scala

Check syntax and types with the Scala compiler.

Note

This syntax checker is fairly primitive. For a better Scala experience we recommend Ensime.

scala-scalastyle

Check style with Scalastyle.

defcustom flycheck-scalastylerc

Configuration file for this syntax checker. See Configuration files.

Important

A configuration file is mandatory for this syntax checker. If flycheck-scalastylerc is not set or the configuration file not found this syntax checker will not be applied.

Scheme

Flycheck checks CHICKEN Scheme files with csc.

scheme-chicken

Check syntax with csc, the CHICKEN Scheme compiler.

defcustom flycheck-scheme-chicken-args

A list of additional options.

Important

Geiser must be installed and active for this checker to work.

Shell scripting languages

Flycheck checks various shell scripting languages:

sh-bash

Check Bash syntax.

defcustom flycheck-sh-bash-args

A list of additional arguments that are passed to bash.

sh-posix-dash

Check POSIX shell syntax with Dash.

sh-posix-bash

Check POSIX shell syntax with Bash.

sh-zsh

Check Zsh syntax.

sh-shellcheck

Lint Bash and POSIX shell with ShellCheck.

defcustom flycheck-shellcheck-excluded-warnings

A list of excluded warnings.

defcustom flycheck-shellcheck-follow-sources

Allow shellcheck to read sourced files.

Slim

slim

Check Slim using the Slim compiler.

slim-lint

Check Slim best practices using the slim-lint linter.

SQL

sql-sqlint

Check SQL syntax with Sqlint.

systemd Unit Configuration

systemd-analyze

Check systemd unit configuration file syntax with systemd-analyze.

Tcl

tcl-nagelfar

Check Tcl syntax with Nagelfar.

Terraform

terraform

Check Terraform syntax with terraform fmt

terraform-tflint

Check Terraform with tflint

defcustom flycheck-tflint-variable-files

A list of files to resolve terraform variables. Relative paths are relative to the path of the buffer being checked.

Text

proselint

Check English prose with Proselint.

textlint

Check prose with textlint.

defcustom flycheck-textlint-config

Configuration file for this syntax checker. See Configuration files.

defcustom flycheck-textlint-plugin-alist

An alist mapping major modes to textlint plugins.

Flycheck currently supports the following textlint plugins on NPM:

  • textlint-plugin-rst
  • textlint-plugin-html
  • textlint-plugin-latex
  • textlint-plugin-asciidoctor (as well as other AsciiDoc plugins)

Note

textlint plugins need to be installed separately.

TeX/LaTeX

Flycheck checks TeX and LaTeX with either tex-chktex or tex-lacheck.

tex-chktex

Check style with ChkTeX.

defcustom flycheck-chktexrc

Configuration file for this syntax checker. See Configuration files.

tex-lacheck

Check style with Lacheck.

Texinfo

texinfo

Check syntax with makeinfo from Texinfo.

TypeScript

typescript-tslint

Check syntax and style with TSLint.

defcustom flycheck-typescript-tslint-config

Configuration file for this syntax checker. See Configuration files.

defcustom flycheck-typescript-tslint-rulesdir

Additional rules directory, for user created rules.

defcustom flycheck-tslint-args

A list of additional arguments that are passed to tslint.

Verilog

verilog-verilator

Check syntax with Verilator.

defcustom flycheck-verilator-include-path

A list of include directories. Relative paths are relative to the file being checked.

VHDL

vhdl-ghdl

Check syntax with GHDL.

defcustom flycheck-ghdl-language-standard

The language standard to use as string.

defcustom flycheck-ghdl-workdir

The directory to use for the file library.

defcustom flycheck-ghdl-ieee-library

The standard to use for the IEEE library.

XML

Flycheck checks XML with xml-xmlstarlet or xml-xmllint.

xml-xmlstarlet

Check syntax with XMLStarlet.

defcustom flycheck-xml-xmlstarlet-xsd-path
defcustom flycheck-xml-xmllint-xsd-path

Location of XSD schema to validate against for xml-xmlstarlet and xml-xmllint respectively.

xml-xmllint

Check syntax with xmllint from Libxml2.

YAML

Flycheck checks YAML with yaml-jsyaml, yaml-ruby or ‘yaml-yamllint’.

yaml-jsyaml

Check syntax with js-yaml.

yaml-ruby

Check syntax with Ruby’s YAML parser.

yaml-yamllint

Check syntax with yamllint.

defcustom flycheck-yamllintrc

Configuration file for this syntax checker. See Configuration files.