Preserve comments with Esprima + Escodegen combination

escodegen-comments.js

// escodegen has a fucked up API for attaching comments
// https://github.com/estools/escodegen/issues/10
var esprima = require("esprima");
var es = require("escodegen");

var ast = esprima.parse(
  '//comment here\nvar answer = 42;',
  {range: true, tokens: true, comment: true}); 

// attaching comments is a separate step
ast  = es.attachComments(ast, ast.comments, ast.tokens);
console.log(es.generate(ast, {comment: true}));

Thanks.

Thanks! I was wondering what was going on and this snippet saved me some debug time 👍

Great !! Super thx

Many thanks, I was scratching my head for a while!

Thanks, saved me a lot of time.