Publish a version of an npm package to your own scope, without (permanently) changing package.json

npm-publish-fork

#!/usr/bin/env ruby

require "json"
require "optparse"

$options = {}

def system!(*args)
  puts "> #{args.join(" ")}"
  system(*args) || raise("Error running #{args.join(" ")}: #{$?} ")
end

option_parser = OptionParser.new do |parser|
  parser.banner = <<~HELP
    Usage: npm-publish-fork [options] npm_scope
    Example: npm-publish-fork --set-version 0.10.1 @my-private-scope
  HELP

  parser.on("--set-version VERSION", "Specify a different published version") { |version| $options[:version] = version}
end

option_parser.parse!

$options[:scope] ||= ARGV[1]

abort("Scope must be specified.\n#{option_parser}") unless $options[:scope]

json = JSON.parse(File.read("package.json"))
previous_name = json["name"]
previous_version = json["version"]

begin
  json["name"] = previous_name.sub(/^(@[^\/]+\/)?/, "#{$options[:scope]}/")
  json["version"] = $options[:version] if $options[:version]
  File.write("package.json", JSON.pretty_generate(json) + "\n")
  system!("npm publish")
ensure
  json["name"] = previous_name
  json["version"] = previous_version if $options[:version]
  File.write("package.json", JSON.pretty_generate(json) + "\n")
end