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Fail if yarn is outdated #363

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Merged
merged 2 commits into from
May 12, 2017
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Fail if yarn is outdated #363

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a0b3448
Fail if yarn is outdated
gauravtiwari May 10, 2017
79aa0df
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gauravtiwari May 11, 2017
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9 changes: 6 additions & 3 deletions lib/tasks/webpacker/check_yarn.rake
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Original file line number Diff line number Diff line change
@@ -1,11 +1,14 @@
namespace :webpacker do
desc "Verifies if yarn is installed"
task :check_yarn do
required_yarn_version = "0.20.1"

begin
version = `yarn --version`
raise Errno::ENOENT if version.blank?
yarn_version = `yarn --version`

raise Errno::ENOENT if yarn_version.blank? || Gem::Version.new(yarn_version) < Gem::Version.new(required_yarn_version)
rescue Errno::ENOENT
puts "Webpacker requires yarn. Please download and install Yarn https://yarnpkg.com/lang/en/docs/install/"
puts "Webpacker requires Yarn version >= #{required_yarn_version}. Please download latest version and install https://yarnpkg.com/lang/en/docs/install/"
puts "Exiting!" && exit!
end
end
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