Hit an error position xx does not resolve to a source location while trying to transform ast to literal code.

[hyf0]

I write a function like this, some of codes are copied from swc codebase.

pub fn ast_to_source(node: &Module) {
  let cm = Lrc::new(SourceMap::new(FilePathMapping::empty()));

  let wr = stdout();
  let mut emitter = Emitter {
      cfg: swc_ecma_codegen::Config { minify: false },
      cm: cm.clone(),
      comments: None,
      wr: Box::new(JsWriter::new(cm.clone(), "\n", wr.lock(), None)),
  };
  emitter.emit_module(node).unwrap();
}

While I trying to use it, It panics. I think it's related to sourcemap, but I lack the knowledge to solve it.

let result  = swc_ecma_ast::Module {
        span: DUMMY_SP,
        body,
        shebang: None,
      };
      println!("source");
      ast_to_source(&result)

[kdy1]

  let cm = Lrc::new(SourceMap::new(FilePathMapping::empty()));

This is wrong. You should use the same instance of Lrc<SourceMap> for parsing and codegen.
It is designed to be shared and that's why it's wrapped in Lrc, which is Rc or Arc, depending on the compile option.

[hyf0]

The module I use to generate is constructing from different modules, each module is parsed from a file and each parsing I will generate a new Lrc<SourceMap>. Should I also use the same Lrc<SourceMap> while parsing?

[kdy1]

Yes, you are expected to do so.
swc_bundler does the same thing.