我在Vagrant中运行Ubuntu 14.x和客户端CMS（Laravel平台，如果相关的话）。请原谅范围的广泛性，因为使用包和依赖项对我来说是新的，让我的头脑游泳，我需要基本沉浸在概念中，以便我能理解它们。也就是说，从我看到的帖子数量看起来像其他开发者面临同样的挑战。
README.md表示在我克隆了回购后，执行yarn来构建所有内容。以下是导致这一点的命令：
which nodejs # /usr/bin/nodejs
nodejs -v # v4.7.3
npm install -g yarn #this installed yarn v0.19.1
yarn
我得到以下序列，每次尝试运行yarn时，都会出现以下错误。有趣的是，在我尝试过的4次中，它引用了一个不同的符号链接，所以很抱歉这个问题：
root@vagrant-ubuntu-trusty-64:/var/www/mycms# yarn
yarn install v0.19.1
warning mycms@0.0.1: No license field
warning mycms@0.0.1: "dependencies" has dependency "babel-polyfill" with range "^6.16.0" that collides with a dependency in "devDependencies" of the same name with version "^6.7.4"
warning mycms@0.0.1: "dependencies" has dependency "babel-preset-es2015" with range "^6.18.0" that collides with a dependency in "devDependencies" of the same name with version "^6.6.0"
[1/4] Resolving packages...
[2/4] Fetching packages...
[3/4] Linking dependencies...
error An unexpected error occurred: "EPROTO: protocol error, symlink '../../../babylon/bin/babylon.js' -> '/var/www/mycms/node_modules/babel-core/node_modules/.bin/babylon'".
info If you think this is a bug, please open a bug report with the information provided in "/var/www/mycms/yarn-error.log".
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.
root@vagrant-ubuntu-trusty-64:/var/www/mycms# yarn
yarn install v0.19.1
warning mycms@0.0.1: No license field
warning mycms@0.0.1: "dependencies" has dependency "babel-polyfill" with range "^6.16.0" that collides with a dependency in "devDependencies" of the same name with version "^6.7.4"
warning mycms@0.0.1: "dependencies" has dependency "babel-preset-es2015" with range "^6.18.0" that collides with a dependency in "devDependencies" of the same name with version "^6.6.0"
[1/4] Resolving packages...
[2/4] Fetching packages...
[3/4] Linking dependencies...
error An unexpected error occurred: "EPROTO: protocol error, symlink '../../../normalize-package-data/node_modules/semver/bin/semver' -> '/var/www/mycms/node_modules/accord/node_modules/.bin/semver'".
info If you think this is a bug, please open a bug report with the information provided in "/var/www/mycms/yarn-error.log".
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.
root@vagrant-ubuntu-trusty-64:/var/www/mycms# yarn
yarn install v0.19.1
warning mycms@0.0.1: No license field
warning mycms@0.0.1: "dependencies" has dependency "babel-polyfill" with range "^6.16.0" that collides with a dependency in "devDependencies" of the same name with version "^6.7.4"
warning mycms@0.0.1: "dependencies" has dependency "babel-preset-es2015" with range "^6.18.0" that collides with a dependency in "devDependencies" of the same name with version "^6.6.0"
[1/4] Resolving packages...
[2/4] Fetching packages...
[3/4] Linking dependencies...
error An unexpected error occurred: "EPROTO: protocol error, symlink '../../../babylon/bin/babylon.js' -> '/var/www/mycms/node_modules/babel-core/node_modules/.bin/babylon'".
info If you think this is a bug, please open a bug report with the information provided in "/var/www/mycms/yarn-error.log".
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.
root@vagrant-ubuntu-trusty-64:/var/www/mycms# yarn #
yarn install v0.19.1
warning mycms@0.0.1: No license field
warning mycms@0.0.1: "dependencies" has dependency "babel-polyfill" with range "^6.16.0" that collides with a dependency in "devDependencies" of the same name with version "^6.7.4"
warning mycms@0.0.1: "dependencies" has dependency "babel-preset-es2015" with range "^6.18.0" that collides with a dependency in "devDependencies" of the same name with version "^6.6.0"
[1/4] Resolving packages...
[2/4] Fetching packages...
[3/4] Linking dependencies...
error An unexpected error occurred: "EPROTO: protocol error, symlink '../../../babylon/bin/babylon.js' -> '/var/www/mycms/node_modules/babel-core/node_modules/.bin/babylon'".
info If you think this is a bug, please open a bug report with the information provided in "/var/www/mycms/yarn-error.log".
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.
我有两个问题希望简洁：
mycms@0.0.1: No license field（这是至关重要的）？dependencies和devDependencies之间的冲突？我在开发环境中工作，但显然不想触摸yarn.lock（？）文件。 dependencies和devDependencies这两个版本中的较大版本（假设这在代码中有效），这会阻止此错误消息吗？答案 0 :(得分：0)
https://docs.npmjs.com/files/package.json#license将帮助您解决No license field错误。
关于不同的依赖关系，您应该只需要babel-polyfill部分中的babel-preset-es2015和devDependencies。