Update node-gyp to the latest version 🚀

[greenkeeper]

The devDependency node-gyp was updated from 4.0.0 to 5.0.0.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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[vweevers]

I want to test this on Windows because of:

• nodejs/node-gyp@8f43f68275
• nodejs/node-gyp@7fe4095974
• nodejs/node-gyp@7a71d68bce
• nodejs/node-gyp@d3b21220a0 (Electron)

[vweevers]

Oh, this doesn't matter, because prebuildify uses the node-gyp that's available in PATH and when npm runs scripts, it adds the global node_modules/npm-lifecycle/node-gyp-bin folder to PATH. Effectively, we're always using the npm-bundled version of node-gyp (also for npm run rebuild).

@ralphtheninja Is that desirable? We're making prebuilds on node current which should ship a recent-ish npm + node-gyp. OTOH, we can't guarantee that Travis and AppVeyor use the same version of node-gyp. And testing things locally - depending on what you've got installed - is not representative of either.

As I see it we have two options:

1. Fix prebuildify to prefer a locally-installed node-gyp
2. Remove the unused devDependency here.

Anyway, I tested prebuildify paired with node-gyp@5 by setting npm_config_node_gyp. The resulting binary works fine in node and electron 4 and 5. Electron@3 still fails, as half-expected.

[ralphtheninja]

Hmm, I think we should fix prebuildify to prefer a locally installed version, otherwise the user have no control over node-gyp whatsoever.

[vweevers]

the user

Do you mean the consumer (if so, we also have to move node-gyp from devDeps to deps) or us?

[ralphtheninja]

Sorry, us :)

[vweevers]

=> prebuild/prebuildify#30