1. N-API Version 7-
Node.js 15 eases the creation, build and support native modules. It comes with N-API version 7 which includes some extra methods to work with array buffers-
napi_status napi_detach_arraybuffer(napi_env env, napi_value arraybuffer)
napi_status napi_is_detached_arraybuffer(napi_env env, napi_value arraybuffer, bool* result)
2. npm 7-
It is a major release that comes with new features including workspaces and a new package-lock.json format. Npm 7 also includes yarn.lock file support. There is a new change in the latest version with npm 7 – peer dependencies are installed by default. Npm team has worked to minimize potential disruption to existing projects because of the switch to automatically installing peer dependencies, if you face any problem, you can sue the –legacy-peer-deps flag at install time as a workaround to revert to the previous behavior. You can set it in the environment or npm config files.
Know more at- [https://solaceinfotech.com/blog/whats-new-in-node-js-15/]