npm install @codingame/monaco-languageclient-react You need to create an infrastructure object and render the LanguageClient component:
importReactfrom"react";importLanguageClient,{Infrastructure}from"@codingame/monaco-languageclient-react";classMyInfrastructureimplementsInfrastructure{automaticTextDocumentUpdate=falserootUri='file://...'useMutualizedProxy(){returnfalse}getFileContent(resource,languageClient){return ... }openConnection(id){// create connection}}constinfrastructure=newMyInfrastructure()functionLanguageClientContainer(){return(<LanguageClientid='java'infrastructure={infrastructure}/>);}