纱线警告：myCMS@0.0.1：没有许可证字段和许可证类型加上依赖冲突

Question

我在 Vagrant（Laravel 平台，如果相关）中运行 Ubuntu 14.x 和客户端的 CMS。请原谅范围的广泛性，因为使用包和依赖项对我来说是新事物，让我头晕目眩，我需要基本上沉浸在这些概念中，这样我才能理解它们。也就是说，从我看到的帖子数量来看，其他开发者似乎面临着同样的挑战。

README.md 说在我克隆 repo 后执行 yarn 来构建所有内容。以下是导致该点的命令：

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，每次我尝试运行 yarn 时，都会出现以下错误。有趣的是，在 4 次中的第 2 次我尝试它引用了一个不同的符号链接，很抱歉这样的长度：

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：

• 如何摆脱mycms@0.0.1: No license field（这很关键）？
• 如何解决dependencies 和devDependencies 之间的冲突？我在开发环境中工作，但显然不想接触yarn.lock(?) 文件。
• 如果我对dependencies 和devDependencies 都使用了两个版本中的较大者（假设这在代码中有效），这是否可以防止出现此错误消息？

Answer 1

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 devDependencies 部分中的 babel-polyfill 和 babel-preset-es2015。