vuepress conflicts with bili installation

[larionov]

• I confirm that this is a issue rather than a question.

Bug report

When I'm trying to run vuepress I'm getting this error:

(node:20384) UnhandledPromiseRejectionWarning: TypeError: cli.command(...).option(...).option
(...).option(...).option(...).option(...).option(...).option(...).option(...).action is not a
 function
    at module.exports (/home/larionov/projects/ui-packages/components/nav/node_modules/vuepre
ss/lib/registerCoreCommands.js:26:6)    

After investigation I realized that a wrong version of cac is used. We have bili as a dependency, which have cac@4 as dependency, while @vuepress/core requires cac@6.

I think the error is happening because cac is used in the 'vuepress` package, but not listed there as a dependency. It is only listed as a dependency in the @vuepress/core package.

Version

1.0.0-alpha.30

Steps to reproduce

I prepared a minimal repo to reproduce the errror:
https://github.com/larionov/reproduce-vuepress-cac-bug

clone https://github.com/larionov/reproduce-vuepress-cac-bug
cd reproduce-vuepress-cac-bug
yarn
yarn docs:dev

What is expected?

vuepress build docs

What is actually happening?

vuepress throws and error:

⋊> ~/p/u/c/nav on fix/NOJIRA-nav-fix-requests ⨯ yarn docs:dev                        13:11:49
yarn run v1.12.3                                                                             
 that collides with a dependency in "devDependencies" of the same name with version "^2.3.0"
$ vuepress dev ./                                                                            
(node:20384) UnhandledPromiseRejectionWarning: TypeError: cli.command(...).option(...).option
(...).option(...).option(...).option(...).option(...).option(...).option(...).action is not a
 function
    at module.exports (/home/larionov/projects/ui-packages/components/nav/node_modules/vuepre
ss/lib/registerCoreCommands.js:26:6)
    at beforeParse (/home/larionov/projects/ui-packages/components/nav/node_modules/vuepress/
vuepress.js:16:5)
    at CLI (/home/larionov/projects/ui-packages/components/nav/node_modules/vuepress/lib/util
.js:22:24)
    at Object.<anonymous> (/home/larionov/projects/ui-packages/components/nav/node_modules/vu
epress/vuepress.js:12:1)
    at Module._compile (internal/modules/cjs/loader.js:678:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:689:10)
    at Module.load (internal/modules/cjs/loader.js:589:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:528:12)
    at Function.Module._load (internal/modules/cjs/loader.js:520:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:719:10)
    at startup (internal/bootstrap/node.js:228:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:575:3)
(node:20384) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error origin
ated either by throwing inside of an async function without a catch block, or by rejecting a 
promise which was not handled with .catch(). (rejection id: 2)
(node:20384) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In th
e future, promise rejections that are not handled will terminate the Node.js process with a n
on-zero exit code.
Done in 0.99s.                        

Other relevant information

• Your OS: linux
• Node.js version: v10
• Browser version:
• Is this a global or local install? local
• Which package manager did you use for the install? yarn

[larionov]

Workaround:
add cac@6 as a dev dependency to your project.