Why I can't import the exported types and functions in langium/src/utils and langium/src/parser?

[durianwaffle]

Hi Langium,

I wanted to use some types and functions under langium/src/utils and langium/src/parser folder.
But I find that I can't import them.
Why is it?

I have checked the index.ts file under langium/src/parser and langium/src seems like it exported everything.

[cdietrich]

Hi, importing AstUtils or CstUtils or import type { LexingDiagnosticSeverity } from "langium" works for me

[msujew]

Im addition to this: You simply cannot import from src or lib from Langium due to restrictions on imports from ESM modules. See also various blog posts on this topic like this.