The native Node modules are supported by Electron, but since Electron is very likely to use a different V8 version from the Node binary installed in your system, you have to manually specify the location of Electron's headers when building native modules.
Three ways to install native modules:
By setting a few environment variables, you can use
npm to install modules
An example of installing all dependencies for Electron:
# Electron's version. export npm_config_target=1.2.3 # The architecture of Electron, can be ia32 or x64. export npm_config_arch=x64 export npm_config_target_arch=x64 # Download headers for Electron. export npm_config_disturl=https://atom.io/download/electron # Tell node-pre-gyp that we are building for Electron. export npm_config_runtime=electron # Tell node-pre-gyp to build module from source code. export npm_config_build_from_source=true # Install all dependencies, and store cache to ~/.electron-gyp. HOME=~/.electron-gyp npm install
You can also choose to install modules like other Node projects, and then
rebuild the modules for Electron with the
package. This module can get the version of Electron and handle the manual steps
of downloading headers and building native modules for your app.
An example of installing
electron-rebuild and then rebuild modules with it:
npm install --save-dev electron-rebuild # Every time you run "npm install", run this: ./node_modules/.bin/electron-rebuild # On Windows if you have trouble, try: .\node_modules\.bin\electron-rebuild.cmd
If you are a developer developing a native module and want to test it against
Electron, you might want to rebuild the module for Electron manually. You can
node-gyp directly to build for Electron:
cd /path-to-module/ HOME=~/.electron-gyp node-gyp rebuild --target=1.2.3 --arch=x64 --dist-url=https://atom.io/download/electron
HOME=~/.electron-gyp changes where to find development headers. The
--target=1.2.3 is version of Electron. The
where to download the headers. The
--arch=x64 says the module is built for
To compile native Node addons against a custom build of Electron that doesn't
match a public release, instruct
npm to use the version of Node you have bundled
with your custom build.
npm rebuild --nodedir=$HOME/.../path/to/electron/vendor/node
If you installed a native module and found it was not working, you need to check following things:
- The architecture of the module has to match Electron's architecture (ia32 or x64).
win_delay_load_hookis not set to
falsein the module's
- After you upgrade Electron, you usually need to rebuild the modules.
- When in doubt, run
On Windows, by default, node-gyp links native modules against
However, in Electron 4.x and higher, the symbols needed by native modules are
electron.exe, and there is no
node.dll in Electron 4.x. In
order to load native modules on Windows, node-gyp installs a delay-load
hook that triggers
when the native module is loaded, and redirects the
node.dll reference to use
the loading executable instead of looking for
node.dll in the library search
path (which would turn up nothing). As such, on Electron 4.x and higher,
'win_delay_load_hook': 'true' is required to load native modules.
If you get an error like
Module did not self-register, or
The specified procedure could not be found, it may mean that the module you're trying to use
did not correctly include the delay-load hook. If the module is built with
node-gyp, ensure that the
win_delay_load_hook variable is set to
binding.gyp file, and isn't getting overridden anywhere. If the module
is built with another system, you'll need to ensure that you build with a
delay-load hook installed in the main
.node file. Your
should look like this:
link.exe /OUT:"foo.node" "...\node.lib" delayimp.lib /DELAYLOAD:node.exe /DLL "my_addon.obj" "win_delay_load_hook.obj"
In particular, it's important that:
- you link against
node.libfrom Electron and not Node. If you link against the wrong
node.libyou will get load-time errors when you require the module in Electron.
- you include the flag
/DELAYLOAD:node.exe. If the
node.exelink is not delayed, then the delay-load hook won't get a chance to fire and the node symbols won't be correctly resolved.
win_delay_load_hook.objis linked directly into the final DLL. If the hook is set up in a dependent DLL, it won't fire at the right time.
See node-gyp for an example delay-load hook if you're implementing your own.
prebuild provides a way to
publish native Node modules with prebuilt binaries for multiple versions of Node
If modules provide binaries for the usage in Electron, make sure to omit
--build-from-source and the
variable in order to take full advantage of the prebuilt binaries.
node-pre-gyp tool provides a way to deploy native Node
modules with prebuilt binaries, and many popular modules are using it.
Usually those modules work fine under Electron, but sometimes when Electron uses a newer version of V8 than Node, and there are ABI changes, bad things may happen. So in general it is recommended to always build native modules from source code.
If you are following the
npm way of installing modules, then this is done
by default, if not, you have to pass
npm, or set the
npm_config_build_from_source environment variable.