在Mac上安装casperjs的困难
原标题：Difficulties installing casperjs on Mac
After days trying install casperjs on my Mac, i m asking some help. I first used "brew install" method and NPM, this is terminal s messages :
brew install casperjs
Updating Homebrew...
==> Downloading https://homebrew.bintray.com/bottles-portable-ruby/portable-ruby-2.6.3_2.yosemite.bottle.tar.gz
######################################################################## 100.0%
==> Pouring portable-ruby-2.6.3_2.yosemite.bottle.tar.gz
==> Auto-updated Homebrew!
Updated 1 tap (homebrew/core).
==> New Formulae
[...]
==> Updated Formulae
Updated 4842 formulae.
==> Renamed Formulae
[...]
==> Deleted Formulae
[...]
xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun
==> Tapping homebrew/cask
[...]
==> Searching for similarly named formulae...
Error: No similarly named formulae found.
Error: No available formula or cask with the name "casperjs".
==> Searching for a previously deleted formula (in the last month)...
Warning: homebrew/core is shallow clone. To get its complete history, run:
git -C "$(brew --repo homebrew/core)" fetch --unshallow
Error: No previously deleted formula found.
==> Searching taps on GitHub...
Error: No formulae found in taps.
So I tried installing with NPM
npm install casperjs -g
npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules
npm ERR! path /usr/local/lib/node_modules
npm ERR! code EACCES
npm ERR! errno -13
npm ERR! syscall access
Thank you in advance,
最佳回答
An edit three years later: if anyone comes across this, I really like mise right now! It s a polyglot version manager, so it works for basically every language, and I switched to it after using asdf for a while. Here s the website.
tl;dr: you should probably try a version manager like nodenv
You re right, brew.sh doesn t list any casper.js formulae; I m not sure why Casper lists it as an installation option in their docs. You could indeed install it using npm and sudo, but a better way to get started is to use a version/environment manager, like nodenv: it allows easy switching of Node.js versions globally, per-project based on a node-version file, or per-shell with an environment variable. Perhaps more importantly, since it installs node modules into a version-specific folder within ~/.nodenv (where ~/ refers to your user/home folder), it doesn t require sudo, which is safer and just generally better practice. You can install nodenv with Homebrew, too, which is nice. There are also other version managers, like NVM and n — I tried them both, but I found nvm to slow down shell startup far too much, and n doesn t allow per-project switching, and on top of all of that I just like the way nodenv works. For a different approach to version management, there s asdf, which is a language-agnostic version manager (though I haven t tried it). Any of them should solve the issue, though.
Also, I m not sure if you installed Node with Homebrew with the intent of using it for development, but if so, that s probably not the greatest idea either — lots of other Homebrew formulae depend on Node, and when you run brew upgrade to update your packages, there s always a possibility that you wind up unwittingly upgrading Node as a dependency of another formula, which would likely break something you ve done or some npm module(s). Basically, it s the same general concept as this blog post about why not to use Homebrew s Python, but with Node.
Hopefully that s helpful!
问题回答
Try it with sudo access. Then the error message say, that you don t have permission to write the npm-packages to the folder note-modules.
With sudo you can become temporarily root-access to install, remove or change any piece of software.
sudo npm i casperjs -g
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