Not sure if it is the correct position to add. emnapi is not a "runtime", but something (a library?) that can help users write bindings between wasm and JavaScript in a same way of Node-API, itself need to be run on a JavaScript runtime such as browser or Node.js.
https://github.com/nodejs/node-addon-api/pull/1283#issuecomment-1427637888
Not sure if it is the correct position to add. emnapi is not a "runtime", but something (a library?) that can help users write bindings between wasm and JavaScript in a same way of Node-API, itself need to be run on a JavaScript runtime such as browser or Node.js.