WriteUtf8 does not take 5 arguments

[Sneezry]

Hi, I have no idea if I made some mistake. But I cannot rebuild nan with electron 3.0.10 (with node 10.2.0).

With command below to rebuild:

node-gyp rebuild --target=3.0.10 --arch=x64 --dist-url=https://atom.io/download/electron

The raw error I got is

C:\Users\...\node_modules\nan\nan.h(1081): error C2660: 'v8::String
::WriteUtf8': function does not take 5 arguments (compiling source file ..\src\combined.cpp) [C:\...\xxx.vcxproj]

I find that the latest nan will call WriteUtf8 with 5 arguments if node version is larger than 10

nan/nan.h

Line 1081 in 55923c8

length_ = string->WriteUtf8(v8::Isolate::GetCurrent(), str_, static_cast<int>(len), 0, flags);

However, WriteUtf8 only accepts 4 arguments in node 10

https://v8docs.nodesource.com/node-10.6/d2/db3/classv8_1_1_string.html#a99aec0d3b418feca1f2a2ba79416c60b

Any ideas? Thanks.

[Flarna]

The 4 param version has been deprecated in v8 in favor of the 5 param version and this has been backported to node 10 (see nodejs/node#22531). Therefore the linked v8 docs don't match to the actual variant of v8 used by node.

See https://github.com/nodejs/node/blob/4128793a150dbcc63e03738ddd30f1768608aa11/deps/v8/include/v8.h#L2656

I assume that the same did not happen in electron and as a result some ifdefs are wrong in this setup.

[Flarna]

Actually it seems that the backport of the v8 change was done with Node 10.10.0. Therefore if someone uses Nan 2.12.0 with Node 10.0.0 till 10.9.0 build will fail.

[Flarna]

Caused by #825 - seems it's a decision between build errors and deprecation warnings.

[amb26]

This also fails in Node 10.11.0

[Flarna]

@amb26 I guess you mean compiling electron with NodeJs 10.10.0. Or some native node extension?

[refack]

@Flarna following your suggestion from TryGhost/node-sqlite3#1093 (review) I got this situation:

• nan@2.11.1 in node-sqlite3 on NODE_VERSION="6" ELECTRON_VERSION="3.0.6" compiles:
  https://travis-ci.org/mapbox/node-sqlite3/jobs/468473910

• nan@2.12.0 in node-sqlite3 on NODE_VERSION="6" ELECTRON_VERSION="3.0.6" fails:
  https://travis-ci.org/mapbox/node-sqlite3/jobs/468884290

[bnoordhuis]

I'll put up a PR with a fix shortly.

[bnoordhuis]

#833 - would be great if an Electron user could test it out as well.

[refack]

Using sqlite3 as a canary for Electron with node4good/node-sqlite3@62fa3c7
linux: https://travis-ci.com/node4good/node-sqlite3/jobs/165649311 ✔️
macOS: https://travis-ci.com/node4good/node-sqlite3/jobs/165649317 ✔️