Mrm Core Versions Save

• Fixed: Fix an issue that copyFIles is unable to overwrite calling script itself (#15)

• Fixed: getExtsFromCommand should return undefined instead of an empty array

• Fixed: getExtsFromCommand should return undefined for empty command

• Fixed: packageJson: insert prescript before script, insert postscript after script

Breaking changes

Node 4 is no longer supported, min Node version is 6.9.

New features

• npm install can accept required package versions (#12, mrm#23):

  const { install } = require('mrm-core')
  install({ lodash: '4.17.3' }) // Install particular version
  install(['lodash'], { versions: { lodash: '4.17.3', other: '1.0.0' } }) // Install particular version
  

  Warning: Possibly breaking change: install will not read package.json anymore, it will take installed packages by reading node_modules/pkg/package.json.

• packageJson.getScript accepts an optional subcommand param:

  const { packageJson } = require('mrm-core')
  const file = packageJson({ default: 'values' })
  file.getScript('test')  // Return script
  file.getScript('test', 'eslint')  // Return a subcommand of a script
  

  Note: subcommand is a command between && in an npm script. For example, prettier --write '**/*.js' && eslint . --fix has two subcommands: prettier… and eslint….

• New method getExtsFromCommand to get file extensions list from a command like eslint . --fix --ext .js,.jsx:

  const { getExtsFromCommand } = require('mrm-core')
  getExtsFromCommand(`eslint . --fix --ext .js,.jsx`, 'ext')
  // => ['js', 'jsx']
  getExtsFromCommand(`prettier --write '**/*.js'`)
  // => ['js']
  

• install/uninstall will run Yarn if project is already using Yarn.

New features

Yarn support in install and uninstall methods:

const { install, uninstall } = require('mrm-core')

uninstall(['eslint'], { yarn: true })
install(['standard'], { yarn: true })

(Thanks @TrySound!)

Bug fixes

Fix: Ensure that a folder exists before saving a file

Expose EditorConfig utilities:

const { inferStyle, getStyleForFile, getIndent, format } = require('mrm-core')
inferStyle('for (;;) {\n  alert(1);\n}\n')
// => { insert_final_newline: true, indent_style: 'space', indent_size: 2 }
getStyleForFile('test.js')
// => { insert_final_newline: false, indent_style: 'tab', indent_size: 'tab' }
getIndent({ indent_style: 'space', indent_size: 2 })
// => '  '
format('alert(1)\n', { insert_final_newline: false })
// => 'alert(1)'
// Only insert_final_newline is supported

New features

Initial EditorConfig support

1. It will try to infer code style from the original file. For new files it’ll read EditorConfig setting for that file. Which means it won’t reformat your files even if they have wrong formatting — code formatting is not the goal of Mrm but making as little changes as possible is.
2. insert_final_newline is applied to all files on save.
3. indent_size and indent_style options are applied to JSON files only.

Support comments in JSON

To add a comment:

const { json } = require('mrm-core')
json('test.json')
  .set({
    '// key': [['// Comment for key']],
    key: 'Pizza'
  })
  .save()

• Fix: Do not remove empty lines on saving in lines() method