Consider add to documentation: Node version

[xinbenlv]

I am following https://docs.nodebb.org/installing/cloud/heroku/#keeping-it-up-to-date to install on Heroku. And at the step

./nodebb setup

It's said that

#...
info sharp Downloading https://github.com/lovell/sharp-libvips/releases/download/v8.7.0/libvips-8.7.0-darwin-x64.tar.gz
prebuild-install WARN install No prebuilt binaries found (target=12.16.1 runtime=node arch=x64 libc= platform=darwin)
  TOUCH Release/obj.target/libvips-cpp.stamp
  CXX(target) Release/obj.target/sharp/src/common.o
In file included from ../src/common.cc:27:
../src/common.h:78:20: error: no member named 'Handle' in namespace 'v8'
  bool HasAttr(v8::Handle<v8::Object> obj, std::string attr);
#...

It seems because the node version I use is 12 and according to https://github.com/lovell/sharp/issues/1683, node 12 removes namespace v8. Unless sharp is upated per https://github.com/lovell/sharp/issues/1683#issuecomment-497553995, we need to make sure the node version needs to be <12

I changed to use node 10, and it works.

This issue is technically resolved in NodeBB v1.13.2

[xinbenlv]

I created a PR for updating the documentation

https://github.com/NodeBB/docs/pull/36

[xinbenlv]

This is now fixed by https://github.com/NodeBB/docs/pull/36 and merged

[PitaJ]

Now I'm confused. It seems like from the issue you linked, we could have just fixed this by updating the version of sharp we use. Am I wrong?

[xinbenlv]

@PitaJ I have not tried using a different sharp version, if you test it, please let me know. I have confirmed that using node < 12 works

[sharonyue]

Yes. Please update sharp. I upgrade node to 12, and I found uploading picture does not work. Then I searched the forum and npm rebuild did the trick, I dont know why though.

[gotwf]

Sharp seems to have a bit of history for being somewhat of a thorn in the side....

https://community.nodebb.org/topic/12940/1-10-1-1-10-2-libvips-whole-x-server-dependency/4?_=1586907702860&lang=en-US

It was confusing to me as well when I first tried taking NodeBB for a test drive. Great support here though for getting such glitches sorted.