Yarn: 针对具有公共 npm 凭据的私有注册表的作用域包的 `yarn add` 失败

标题有点啰嗦。 换句话说：当.npmrc （或者，大概是.yarnrc ）配置了_both_一个私有注册表 URL _and_一个用于发布到公共 npm 的身份验证令牌时，安装范围包会中断。 这里有问题的私有注册表是 Artifactory，目前的理论是 Yarn 正在发送凭证（_不恰当地_：配置用于两个不同的 URL），Artifactory 对此不满意，以及 401（因为凭证用于公共 npm，不是人造的）。 我不确定为什么范围包会被区别对待，否则它可以正常工作。

下面是一些命令来说明：

> pwd
~

> cat .yarnrc
cat: .yarnrc: No such file or directory

> cat .npmrc
registry=<private registry URL that works fine with npm and non-scoped packages>
//registry.npmjs.org/:_authToken=<my auth token>

> yarn add @types/d3-scale --verbose
yarn add v0.19.1
info No lockfile found.
verbose Performing "GET" request to "https://yarnpkg.com/latest-version".
[1/4] 🔍  Resolving packages...
verbose Performing "GET" request to "<correct private registry URL ...>/@types%2fd3-scale".
verbose Request "<correct private registry URL ...>/@types%2fd3-scale" finished with status code 401.
verbose Error: Couldn't find package "@types/d3-scale" on the "npm" registry.
    at MessageError (/usr/local/Cellar/yarn/0.19.1/libexec/lib/node_modules/yarn/lib/errors.js:8:5)
    at /usr/local/Cellar/yarn/0.19.1/libexec/lib/node_modules/yarn/lib/resolvers/registries/npm-resolver.js:207:15
    at next (native)
    at step (/usr/local/Cellar/yarn/0.19.1/libexec/lib/node_modules/yarn/node_modules/babel-runtime/helpers/asyncToGenerator.js:17:30)
    at /usr/local/Cellar/yarn/0.19.1/libexec/lib/node_modules/yarn/node_modules/babel-runtime/helpers/asyncToGenerator.js:28:13
    at process._tickCallback (internal/process/next_tick.js:103:7)
error Couldn't find package "@types/d3-scale" on the "npm" registry.
info Visit https://yarnpkg.com/en/docs/cli/add for documentation about this command.

> npm install @types/d3-scale
~
└─┬ @types/[email protected] 
  └── @types/[email protected] 

> yarn add d3-scale          
yarn add v0.19.1
info No lockfile found.
[1/4] 🔍  Resolving packages...
[2/4] 🚚  Fetching packages...
[3/4] 🔗  Linking dependencies...
[4/4] 📃  Building fresh packages...
success Saved lockfile.
success Saved 8 new dependencies.
├─ [email protected]
├─ [email protected]
├─ [email protected]
├─ [email protected]
├─ [email protected]
├─ [email protected]
├─ [email protected]
└─ [email protected]
✨  Done in 2.45s.

# edit .npmrc...

> cat .npmrc 
registry=<same registry URL>

> yarn add @types/d3-scale 
yarn add v0.19.1
warning No license field
[1/4] 🔍  Resolving packages...
[2/4] 🚚  Fetching packages...
[3/4] 🔗  Linking dependencies...
[4/4] 📃  Building fresh packages...
success Saved lockfile.
success Saved 2 new dependencies.
├─ @types/[email protected]
└─ @types/[email protected]
warning No license field
✨  Done in 1.50s.