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prettier documentation

prettier - GitHub

Configuration in MegaLinter

Variable Description Default value
JAVASCRIPT_DEFAULT_STYLE For prettier to be active, JAVASCRIPT_DEFAULT_STYLE must be prettier standard
JAVASCRIPT_PRETTIER_ARGUMENTS User custom arguments to add in linter CLI call
Ex: -s --foo "bar"
JAVASCRIPT_PRETTIER_COMMAND_REMOVE_ARGUMENTS User custom arguments to remove from command line before calling the linter
Ex: -s --foo "bar"
JAVASCRIPT_PRETTIER_FILTER_REGEX_INCLUDE Custom regex including filter
Ex: (src\|lib)		 Include every file
JAVASCRIPT_PRETTIER_FILTER_REGEX_EXCLUDE Custom regex excluding filter
Ex: (test\|examples)		 Exclude no file
JAVASCRIPT_PRETTIER_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
JAVASCRIPT_PRETTIER_FILE_EXTENSIONS Allowed file extensions. "*" matches any extension, "" matches empty extension. Empty list excludes all files
Ex: [".py", ""]		 [".js"]
JAVASCRIPT_PRETTIER_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
JAVASCRIPT_PRETTIER_PRE_COMMANDS List of bash commands to run before the linter None
JAVASCRIPT_PRETTIER_POST_COMMANDS List of bash commands to run after the linter None
JAVASCRIPT_PRETTIER_UNSECURED_ENV_VARIABLES List of env variables explicitly not filtered before calling JAVASCRIPT_PRETTIER and its pre/post commands None
JAVASCRIPT_PRETTIER_CONFIG_FILE prettier configuration file nameUse LINTER_DEFAULT to let the linter find it .prettierrc.json
JAVASCRIPT_PRETTIER_RULES_PATH Path where to find linter configuration file Workspace folder, then MegaLinter default rules
JAVASCRIPT_PRETTIER_DISABLE_ERRORS Run linter but consider errors as warnings true
JAVASCRIPT_PRETTIER_DISABLE_ERRORS_IF_LESS_THAN Maximum number of errors allowed 0
JAVASCRIPT_PRETTIER_CLI_EXECUTABLE Override CLI executable ['prettier']

IDE Integration

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

IDE Extension Name Install
Atom prettier-atom Visit Web Site
Atom atom-mprettier Visit Web Site
Atom atom-miniprettier Visit Web Site
Emacs prettier-emacs Visit Web Site
Emacs prettier.el Visit Web Site
Emacs apheleia Visit Web Site
IDEA Prettier
Sublime Text JsPrettier Visit Web Site
vim vim-prettier Visit Web Site
visual_studio JavaScriptPrettier Visit Web Site
Visual Studio Code prettier-vscode Install in VSCode

MegaLinter Flavours

This linter is available in the following flavours

Flavor Description Embedded linters Info
all Default MegaLinter Flavor 121 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 72 Docker Image Size (tag) Docker Pulls
formatters Contains only formatters 17 Docker Image Size (tag) Docker Pulls
javascript Optimized for JAVASCRIPT or TYPESCRIPT based projects 59 Docker Image Size (tag) Docker Pulls

Behind the scenes

How are identified applicable files

  • File extensions: .js

How the linting is performed

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

Example calls

prettier --check myfile.js

prettier --config .prettierrc.json --check myfile.js

prettier --config .prettierrc.json --write myfile.js

Help content

Usage: prettier [options] [file/dir/glob ...]

By default, output is written to stdout.
Stdin is read if it is piped to Prettier and no files are given.

Output options:

  -c, --check              Check if the given files are formatted, print a human-friendly summary
                           message and paths to unformatted files (see also --list-different).
  -l, --list-different     Print the names of files that are different from Prettier's formatting (see also --check).
  -w, --write              Edit files in-place. (Beware!)

Format options:

  --arrow-parens <always|avoid>
                           Include parentheses around a sole arrow function parameter.
                           Defaults to always.
  --bracket-same-line      Put > of opening tags on the last line instead of on a new line.
                           Defaults to false.
  --no-bracket-spacing     Do not print spaces between brackets.
  --embedded-language-formatting <auto|off>
                           Control how Prettier formats quoted code embedded in the file.
                           Defaults to auto.
  --end-of-line <lf|crlf|cr|auto>
                           Which end of line characters to apply.
                           Defaults to lf.
  --no-experimental-ternaries
                           Default behavior of ternaries; keep question marks on the same line as the consequent.
  --html-whitespace-sensitivity <css|strict|ignore>
                           How to handle whitespaces in HTML.
                           Defaults to css.
  --jsx-single-quote       Use single quotes in JSX.
                           Defaults to false.
  --parser <flow|babel|babel-flow|babel-ts|typescript|acorn|espree|meriyah|css|less|scss|json|json5|jsonc|json-stringify|graphql|markdown|mdx|vue|yaml|glimmer|html|angular|lwc>
                           Which parser to use.
  --print-width <int>      The line length where Prettier will try wrap.
                           Defaults to 80.
  --prose-wrap <always|never|preserve>
                           How to wrap prose.
                           Defaults to preserve.
  --quote-props <as-needed|consistent|preserve>
                           Change when properties in objects are quoted.
                           Defaults to as-needed.
  --no-semi                Do not print semicolons, except at the beginning of lines which may need them.
  --single-attribute-per-line
                           Enforce single attribute per line in HTML, Vue and JSX.
                           Defaults to false.
  --single-quote           Use single quotes instead of double quotes.
                           Defaults to false.
  --tab-width <int>        Number of spaces per indentation level.
                           Defaults to 2.
  --trailing-comma <all|es5|none>
                           Print trailing commas wherever possible when multi-line.
                           Defaults to all.
  --use-tabs               Indent with tabs instead of spaces.
                           Defaults to false.
  --vue-indent-script-and-style
                           Indent script and style tags in Vue files.
                           Defaults to false.

Config options:

  --config <path>          Path to a Prettier configuration file (.prettierrc, package.json, prettier.config.js).
  --no-config              Do not look for a configuration file.
  --config-precedence <cli-override|file-override|prefer-file>
                           Define in which order config files and CLI options should be evaluated.
                           Defaults to cli-override.
  --no-editorconfig        Don't take .editorconfig into account when parsing configuration.
  --find-config-path <path>
                           Find and print the path to a configuration file for the given input file.
  --ignore-path <path>     Path to a file with patterns describing files to ignore.
                           Multiple values are accepted.
                           Defaults to [.gitignore, .prettierignore].
  --plugin <path>          Add a plugin. Multiple plugins can be passed as separate `--plugin`s.
                           Defaults to [].
  --with-node-modules      Process files inside 'node_modules' directory.

Editor options:

  --cursor-offset <int>    Print (to stderr) where a cursor at the given position would move to after formatting.
                           Defaults to -1.
  --range-end <int>        Format code ending at a given character offset (exclusive).
                           The range will extend forwards to the end of the selected statement.
                           Defaults to Infinity.
  --range-start <int>      Format code starting at a given character offset.
                           The range will extend backwards to the start of the first line containing the selected statement.
                           Defaults to 0.

Other options:

  --cache                  Only format changed files. Cannot use with --stdin-filepath.
                           Defaults to false.
  --cache-location <path>  Path to the cache file.
  --cache-strategy <metadata|content>
                           Strategy for the cache to use for detecting changed files.
  --no-color               Do not colorize error messages.
  --no-error-on-unmatched-pattern
                           Prevent errors when pattern is unmatched.
  --file-info <path>       Extract the following info (as JSON) for a given file path. Reported fields:
                           * ignored (boolean) - true if file path is filtered by --ignore-path
                           * inferredParser (string | null) - name of parser inferred from file path
  -h, --help <flag>        Show CLI usage, or details about the given flag.
                           Example: --help write
  -u, --ignore-unknown     Ignore unknown files.
  --insert-pragma          Insert @format pragma into file's first docblock comment.
                           Defaults to false.
  --log-level <silent|error|warn|log|debug>
                           What level of logs to report.
                           Defaults to log.
  --require-pragma         Require either '@prettier' or '@format' to be present in the file's first docblock comment
                           in order for it to be formatted.
                           Defaults to false.
  --stdin-filepath <path>  Path to the file to pretend that stdin comes from.
  --support-info           Print support information as JSON.
  -v, --version            Print Prettier version.

Installation on mega-linter Docker image