Skip to content

eslint

GitHub stars autofix sarif GitHub release (latest SemVer) GitHub last commit GitHub commit activity GitHub contributors

eslint requires a custom configuration file applicable to your project.

You can create it by typing npx eslint --init in the root of your repository

eslint documentation

typescript-eslint - GitHub

Configuration in MegaLinter

Variable Description Default value
TYPESCRIPT_ES_ARGUMENTS User custom arguments to add in linter CLI call
Ex: -s --foo "bar"
TYPESCRIPT_ES_COMMAND_REMOVE_ARGUMENTS User custom arguments to remove from command line before calling the linter
Ex: -s --foo "bar"
TYPESCRIPT_ES_FILTER_REGEX_INCLUDE Custom regex including filter
Ex: (src\|lib)
Include every file
TYPESCRIPT_ES_FILTER_REGEX_EXCLUDE Custom regex excluding filter
Ex: (test\|examples)
Exclude no file
TYPESCRIPT_ES_CLI_LINT_MODE Override default CLI lint mode
- file: Calls the linter for each file
- list_of_files: Call the linter with the list of files as argument
- project: Call the linter from the root of the project
list_of_files
TYPESCRIPT_ES_FILE_EXTENSIONS Allowed file extensions. "*" matches any extension, "" matches empty extension. Empty list excludes all files
Ex: [".py", ""]
[".ts"]
TYPESCRIPT_ES_FILE_NAMES_REGEX File name regex filters. Regular expression list for filtering files by their base names using regex full match. Empty list includes all files
Ex: ["Dockerfile(-.+)?", "Jenkinsfile"]
Include every file
TYPESCRIPT_ES_PRE_COMMANDS List of bash commands to run before the linter None
TYPESCRIPT_ES_POST_COMMANDS List of bash commands to run after the linter None
TYPESCRIPT_ES_UNSECURED_ENV_VARIABLES List of env variables explicitly not filtered before calling TYPESCRIPT_ES and its pre/post commands None
TYPESCRIPT_ES_CONFIG_FILE eslint configuration file nameUse LINTER_DEFAULT to let the linter find it .eslintrc.json
TYPESCRIPT_ES_RULES_PATH Path where to find linter configuration file Workspace folder, then MegaLinter default rules
TYPESCRIPT_ES_DISABLE_ERRORS Run linter but consider errors as warnings false
TYPESCRIPT_ES_DISABLE_ERRORS_IF_LESS_THAN Maximum number of errors allowed 0
TYPESCRIPT_ES_CLI_EXECUTABLE Override CLI executable ['eslint']

IDE Integration

Use eslint in your favorite IDE to catch errors before MegaLinter !

IDE Extension Name Install
Brackets brackets-eslint Visit Web Site
Eclipse Tern-Linter-ESLint Visit Web Site
Emacs flycheck Visit Web Site
IDEA ESLint Plugin
Sublime Text SublimeLinter-eslint Visit Web Site
vim ale Visit Web Site
vim Syntastic Visit Web Site
Visual Studio Code vscode-eslint Install in VSCode

MegaLinter Flavours

This linter is available in the following flavours

Flavor Description Embedded linters Info
all Default MegaLinter Flavor 124 Docker Image Size (tag) Docker Pulls
cupcake MegaLinter for the most commonly used languages 83 Docker Image Size (tag) Docker Pulls
dotnetweb Optimized for C, C++, C# or VB based projects with JS/TS 71 Docker Image Size (tag) Docker Pulls
javascript Optimized for JAVASCRIPT or TYPESCRIPT based projects 60 Docker Image Size (tag) Docker Pulls

Behind the scenes

How are identified applicable files

  • Activated only if one of these files is found: .eslintrc.json, .eslintrc.yml, .eslintrc.yaml, .eslintrc.js, .eslintrc.cjs, package.json:eslintConfig
  • File extensions: .ts

How the linting is performed

  • eslint is called once with the list of files as arguments (list_of_files CLI lint mode)

Example calls

eslint myfile.ts
eslint -c .eslintrc.json --no-eslintrc --no-ignore myfile.ts
eslint --fix -c .eslintrc.json --no-eslintrc --no-ignore myfile.ts

Help content

eslint [options] file.js [file.js] [dir]

Basic configuration:
  --no-eslintrc                    Disable use of configuration from .eslintrc.*
  -c, --config path::String        Use this configuration, overriding .eslintrc.* config options if present
  --env [String]                   Specify environments
  --ext [String]                   Specify JavaScript file extensions
  --global [String]                Define global variables
  --parser String                  Specify the parser to be used
  --parser-options Object          Specify parser options
  --resolve-plugins-relative-to path::String  A folder where plugins should be resolved from, CWD by default

Specify Rules and Plugins:
  --plugin [String]                Specify plugins
  --rule Object                    Specify rules
  --rulesdir [path::String]        Load additional rules from this directory. Deprecated: Use rules from plugins

Fix Problems:
  --fix                            Automatically fix problems
  --fix-dry-run                    Automatically fix problems without saving the changes to the file system
  --fix-type Array                 Specify the types of fixes to apply (directive, problem, suggestion, layout)

Ignore Files:
  --ignore-path path::String       Specify path of ignore file
  --no-ignore                      Disable use of ignore files and patterns
  --ignore-pattern [String]        Pattern of files to ignore (in addition to those in .eslintignore)

Use stdin:
  --stdin                          Lint code provided on <STDIN> - default: false
  --stdin-filename String          Specify filename to process STDIN as

Handle Warnings:
  --quiet                          Report errors only - default: false
  --max-warnings Int               Number of warnings to trigger nonzero exit code - default: -1

Output:
  -o, --output-file path::String   Specify file to write report to
  -f, --format String              Use a specific output format - default: stylish
  --color, --no-color              Force enabling/disabling of color

Inline configuration comments:
  --no-inline-config               Prevent comments from changing config or rules
  --report-unused-disable-directives  Adds reported errors for unused eslint-disable and eslint-enable directives
  --report-unused-disable-directives-severity String  Chooses severity level for reporting unused eslint-disable and eslint-enable directives - either: off, warn, error, 0, 1, or 2

Caching:
  --cache                          Only check changed files - default: false
  --cache-file path::String        Path to the cache file. Deprecated: use --cache-location - default: .eslintcache
  --cache-location path::String    Path to the cache file or directory
  --cache-strategy String          Strategy to use for detecting changed files in the cache - either: metadata or content - default: metadata

Miscellaneous:
  --init                           Run config initialization wizard - default: false
  --env-info                       Output execution environment information - default: false
  --no-error-on-unmatched-pattern  Prevent errors when pattern is unmatched
  --exit-on-fatal-error            Exit with exit code 2 in case of fatal error - default: false
  --debug                          Output debugging information
  -h, --help                       Show help
  -v, --version                    Output the version number
  --print-config path::String      Print the configuration for the given file

Installation on mega-linter Docker image