Checklist

• npm install && npm run lint && npm test passes
• commit message follows commit guidelines

Description of change

Refs:

• fix: support cross compiling for wasm with make generator gyp-next#222 (comment)
• Question about cross compile Node-API addon to wasm with emnapi and emscripten on Windows/macOS #2823

I'm trying to add node-gyp support to emnapi, some upstream changes are made in nodejs/gyp-next#222. I'd like to add the linker option --js-library=<(common_gypi_dir)/dist/library_napi.js in emnapi's common.gypi' (used via --nodedir). The --js-library need to receive an absolute path because relative path doesn't work when emcc runs in node-gyp build stage the CWD is ${projectRoot}/build. But I can't find a way to set the --js-library relative to the nodedir or common_gypi_dir. See nodejs/gyp-next#222 (comment) for more detail description about this. I know there are <(node_root_dir) and <(nodedir), but there is no guarantee that they are absolute path.

Adding a -D affects almost nothing. It would be great if someone could tell that there is a better way.