Add support for electron v8

Problem description

I want to use grpc with electron v8.2.5 (stable). But when I am running "postinstall": "npm rebuild grpc --target=8.2.5 --runtime=electron"

I get this error:

Pre-built binaries not found for grpc@1.24.2 and electron@8.2.5 (electron-v8.2 ABI, unknown) (falling back to source compile with node-gyp)

If do not rebuild I get the error mentioned in #6138

[Error: …/node_modules/grpc/src/node/extension_binary/grpc_node.node: undefined symbol: GENERAL_NAME_free]

Environment

• OS name, version and architecture: macOS Catalina 10.15.3
• Node version v12.13.0
• Node installation method yarn / lerna
• Package name and version grpc@1.24.2

Additional context

related to

• #989 Electron v6 and gRPC error
• #1235 Publish build for electron 7.1
• #6138 Error running gRPC greeter example with electron

Is there any workaround? Or is the release of v1.25.0 near?

[murgatroid99]

Yes, the Electron 9 binaries will go out at the same time.

[murgatroid99]

I am working on this. I think I can get a new release out soon with the new binary files, including the ones for Electron.