Remove redundant electron prebuilds?

[vweevers]

I noticed that node-napi.node and electron-napi.node are equal, at least for Linux. So we can save on npm package size by only including node-napi.node (doesn't matter to node-gyp-build, it will treat that as a "runtime agnostic" prebuild).

Under what conditions do they not match? 🤔

[ralphtheninja]

Hmm, that's a good question. cc @mafintosh

[vweevers]

FYI

npm notice package: leveldown@5.0.0
npm notice === Tarball Contents ===
...
npm notice 389.3kB prebuilds/android-arm/node-napi.node
npm notice 394.4kB prebuilds/android-arm64/node-napi.node
npm notice 295.3kB prebuilds/darwin-x64/electron-napi.node
npm notice 295.3kB prebuilds/darwin-x64/node-napi.node
npm notice 388.5kB prebuilds/linux-arm/node-napi.node
npm notice 406.8kB prebuilds/linux-arm64/node-napi.node
npm notice 407.1kB prebuilds/linux-x64/electron-napi.node
npm notice 407.1kB prebuilds/linux-x64/node-napi.node
npm notice 489.5kB prebuilds/win32-x64/electron-napi.node
npm notice 501.2kB prebuilds/win32-x64/node-napi.node
npm notice 249B    scripts/cross-compile
npm notice === Tarball Details ===
npm notice name:          leveldown
npm notice version:       5.0.0
npm notice package size:  2.0 MB
npm notice unpacked size: 5.2 MB
npm notice shasum:        44bb893346c2791b3b50276171a5421ecd83f2a9
npm notice integrity:     sha512-MZhLrJEanXmaM[...]3eF8Pw1QYBSDg==
npm notice total files:   195

[vweevers]

See nodejs/node-addon-api#269 - it seems only Windows needs a separate Electron prebuild.

[vweevers]

Preliminary support matrix:

OS	Electron	electron-napi.node	node-napi.node
Windows 10 x64	3.1.8	✔️	❌ (nodejs/node-addon-api/issues/269)
Windows 10 x64	4.1.2	❌ (cryptic error)	✔️
Linux x64	3.1.8	identical build >	TBD
Linux x64	4.1.2	identical build >	TBD
MacOS x64	3.1.8	✔️	✔️
MacOS x64	4.1.2	✔️	✔️

[vweevers]

Given these results, I think our best bet is to ditch electron-napi.node for all platforms, and to recommend Windows users to either use --build-from-source or upgrade to Electron 4.