message: .prettierrc en JSON
  J'utilise prettier_d, qui permet d'accelerer le formattage, et il ne
  supporte que les configs en JSON...
diff: -printWidth: 80
  -trailingComma: none
  -bracketSpacing: true
  -jsxBracketSameLine: true
  -useTabs: true
  -semi: false
  -singleQuote: true
  -arrowParens: avoid
  -proseWrap: preserve
  -tabWidth: 2
  +{
  + "printWidth": 80,
  + "trailingComma": "none",
  + "bracketSpacing": true,
  + "jsxBracketSameLine": true,
  + "useTabs": true,
  + "semi": false,
  + "singleQuote": true,
  + "arrowParens": "avoid",
  + "proseWrap": "preserve",
  + "tabWidth": 2
  +}
  