you should add "type":"module", in package.json
to work on nodejs side (not browser)
otherwise, we get
~/project/node_modules/y-websocket/src/y-websocket.js:7
import * as Y from 'yjs' // eslint-disable-line
^^^^^^
SyntaxError: Cannot use import statement outside a module
at internalCompileFunction (node:internal/vm:77:18)
at wrapSafe (node:internal/modules/cjs/loader:1288:20)
at Module._compile (node:internal/modules/cjs/loader:1340:27)
at Module._extensions..js (node:internal/modules/cjs/loader:1435:10)
at Module.load (node:internal/modules/cjs/loader:1207:32)
at Module._load (node:internal/modules/cjs/loader:1023:12)
at cjsLoader (node:internal/modules/esm/translators:345:17)
at ModuleWrap.<anonymous> (node:internal/modules/esm/translators:294:7)
at ModuleJob.run (node:internal/modules/esm/module_job:218:25)
at async ModuleLoader.import (node:internal/modules/esm/loader:329:24)
Node.js v20.10.0
you should add "type":"module", in package.json to work on nodejs side (not browser) otherwise, we get