Enhancement: add support for Node 12

[ex1st]

gyp ERR! build error 
gyp ERR! stack Error: `make` failed with exit code: 2
gyp ERR! stack     at ChildProcess.onExit (/home/ubuntu/.nvm/versions/node/v12.0.0/lib/node_modules/npm/node_modules/node-gyp/lib/build.js:262:23)
gyp ERR! stack     at ChildProcess.emit (events.js:196:13)
gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:256:12)
gyp ERR! System Linux 5.0.0-13-generic
gyp ERR! command "/home/ubuntu/.nvm/versions/node/v12.0.0/bin/node" "/home/ubuntu/.nvm/versions/node/v12.0.0/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"
gyp ERR! cwd /home/ubuntu/test/node_modules/sharp
gyp ERR! node -v v12.0.0
gyp ERR! node-gyp -v v3.8.0
gyp ERR! not ok 
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! sharp@0.22.0 install: `(node install/libvips && node install/dll-copy && prebuild-install) || (node-gyp rebuild && node install/dll-copy)`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the sharp@0.22.0 install script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

[lovell]

Yes, I see the same thing here. The first compilation failure is:

../src/common.h:80:20: error: ‘Handle’ is not a member of ‘v8’
   bool HasAttr(v8::Handle<v8::Object> obj, std::string attr);
                    ^~~~~~

It looks like the underlying version of V8 in Node 12 finally removed the deprecated v8::Handle, which I think was still required for the version of V8 used in the no-longer-supported Node 4.

Commit aa9b328 removes use of the deprecated API. This will be in v0.22.1.

[DIYgod]

Thanks for your work, when will v0.22.1 be released?

[lovell]

@DIYgod docker-library/official-images#5789 will allow Node 12 CI and therefore prebuilt binaries, which is worth waiting for.

[dhritzkiv]

Looks like Node 12 just got added as tags on the docker image. Strangely, there's no node:12; the most 'generic' is node:12.0 (note the 0 in the minor position)

[lovell]

CI for Linux and OS X now passing with Node 12 - https://travis-ci.org/lovell/sharp/builds/524351959

CI for Windows is dependent on appveyor/ci#2921

[nstepien]

@lovell You don't have to wait for an AppVeyor update with Update-NodeJsInstallation
nstepien/iltorb@9a088c3
https://ci.appveyor.com/project/MayhemYDG/iltorb/builds/24079316/job/fmh7l7sm6ht5mdjf
This method will make your builds a bit slower, but it's worth it so you don't have to wait for AppVeyor updates.

[nstepien]

@lovell Here's a PR for this: #1669

[lovell]

Waiting for electron/node-abi#62 so we can build for ABI 72 (Node 12).

[lovell]

v0.22.1 now available with support for Node 12.

[imkane]

Updating to sharp 0.22.1 fixed this for me w/ Windows + Node 12, thanks!