Code Assist missing for node_packages
Having created an empty project, ran npm install, added a dependency on d3 and then tried using it in a js file, I do not get code assist. Even worse, webstorm tells me, that d3.json is unresolved.
Am I missing some additional configuration needed?
Thanks

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d3 package re-exports modules from dozens of d3-* packages that are not listed as direct dependences in your package.json and thus are not included in the IDE index. In particular, json() function is declared in d3-fetch module. You can un-exclude all these packages manually by right-clicking them in Package explorer and choosing Mark directory as/Not excluded. But I'd strongly recommend installing the TypeScript library stubs instead (see https://www.jetbrains.com/help/webstorm/2020.1/configuring-javascript-libraries.html#ws_jsconfigure_libraries_ts_definition_files)
Completion/resolving works fine for me when stubs are installed: