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mikaela.github.io/n/prettier.md

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Automaattinen sisällysluettelo / Automatically generated Table of Contents

The packages

Installation

  1. corepack pnpm install -D -E prettier@latest prettier-plugin-nginx@latest @prettier/plugin-ruby@latest prettier-plugin-toml@latest @prettier/plugin-xml@latest prettier-plugin-sh@latest or probably just corepack pnpm install -D if it’s not your project.
  2. If they don’t exist already echo "{}" > .prettierrc && touch .prettierignore
  3. corepack pnpm exec prettier . --write or corepack pnpm exec prettier . --check

Configuration

I do with .editorconfig what I can, but for example my template .prettierrc.json looks like this. I use pre-commit’s pretty-format-json, while the one included on this page gets managed by prettier.

{
  "bracketSameLine": true,
  "endOfLine": "auto",
  "insertPragma": true,
  "overrides": [
    {
      "files": ".prettierrc",
      "options": {
        "parser": "json"
      }
    },
    {
      "files": "conf/librewolf.overrides.cfg",
      "options": {
        "parser": "babel"
      }
    },
    {
      "files": "conf/autoconfig.js.online",
      "options": {
        "parser": "babel"
      }
    }
  ],
  "plugins": [
    "@prettier/plugin-ruby",
    "@prettier/plugin-xml",
    "prettier-plugin-nginx",
    "prettier-plugin-sh",
    "prettier-plugin-toml"
  ],
  "proseWrap": "always",
  "quoteProps": "consistent",
  "requirePragma": false,
  "singleAttributePerLine": true
}

See the documentation linked on the bottom, but here are some explanations anyway:

  • bracketSameLine: true - HTML tags closing on the same line as something else just looks so much better for my eyes.
  • endOfLine: auto - The default is lf line-endings, which I support in general, but I think prettier is the wrong place to configure it. I have it in .gitattributes which will take priority on check-in and .editorconfig.
  • insertPragma: true - adds a comment on files formatted
  • overrides and plugins - self-explanatory, but if not see the documentation (bottom of the page). I know I don’t actually have .prettierrc as it’s .prettierrc.json, but it doesn’t seem to hurt and babel seems to be used for JavaScript by default, which those two are regardless of the name.
  • proseWrap: always - wraps long markdown lines as individual newlines don’t matter (two begin a new paragraph).
  • quoteProps: consistent - quotes things if anything is quoted.
  • requirePragma: false - the other side of insertPragma: true, it’s here as a note to self.
  • singleAttributePerLine: true - I just think it looks better.

.pre-commit-config.yaml

This is the file that controls pre-commits behaviour.

Offline

I accidentally wrote this while updating this page to reflect me using prettier outside of pre-commit too nowadays. This has the advantage that the same local environment gets reused and dependencies are managed centrally, but assumes everyone uses pnpm, won’t work in pre-commit ci and may have other issues I am not thinking of as a not-coder myself.

ci:
  skip: [pnpm-install-dev, prettier]

repos:
  - repo: local
    hooks:
      - id: pnpm-install-dev
        name: Install pnpm dev dependencies
        entry: corepack pnpm install -D
        language: system
        always_run: true
        #verbose: true
        pass_filenames: false
      - id: prettier
        name: prettier
        entry: corepack pnpm exec prettier --cache --ignore-unknown --write
        language: system
        # Better handled by pretty-format-json from pre-commit-hooks.
        # Remember to have *.json in .prettierignore!
        #exclude_types: [json]

Further information