let dockerfileLanguageService = require("dockerfile-language-service");
let service = dockerfileLanguageService.DockerfileLanguageServiceFactory.createLanguageService();
let symbols = service.computeSymbols(
{
"uri": "file:///tmp/Dockerfile"
},
"#escape=`\n#syntax=docker/dockerfile"
);
console.log(symbols.length);
2
should be printed as there are two directives.