var acorn = require("acorn");
var jsx = require("acorn-jsx");
var JSXParser = acorn.Parser.extend(jsx());
JSXParser.parse("foo()", { ecmaVersion: 2020 });

var acorn = require("acorn");
var jsx = require("acorn-jsx");
var JSXParser = acorn.Parser.extend(jsx());
JSXParser.parse("foo()", { ecmaVersion: 2020 });

let acorn = require("acorn");
console.log(acorn.parse("1 + 1", { ecmaVersion: 2020 }));

var acorn = require("acorn"),
  jsesc = require("jsesc"),
  walk = require("estree-walker").walk,
  MagicString = require("magic-string"),
  createFilter = require("rollup-pluginutils").createFilter,
  extname = require("path").extname;

module.exports = function (options) {
  if (options == null) options = {};
  var filter = createFilter(
      options.include,
      options.exclude
    ),
    map = options.sourceMap !== false;
  return {
    transform: function (code, id) {
      if (!filter(id) || extname(id) !== ".js") return;

      var ast,
        magic = new MagicString(code),
        modified;

      try {
        ast = acorn.parse(code, {
          ecmaVersion: 6,
          sourceType: "module",
        });
      } catch (error) {
        error.message += " in " + id;
        throw error;
      }

      walk(ast, {
        enter: function (node, parent) {
          if (map) {
            magic.addSourcemapLocation(node.start);
            magic.addSourcemapLocation(node.end);
          }
          if (
            node.type === "Literal" &&
            typeof node.value === "string"
          ) {
            var raw0 = node.raw,
              raw1 = jsesc(node.value, {
                wrap: true,
                quotes:
                  raw0[0] === "'" ? "single" : "double",
              });
            if (raw0 !== raw1) {
              modified = true;
              magic.overwrite(node.start, node.end, raw1);
            }
          }
        },
      });

      return (
        modified && {
          code: magic.toString(),
          map: map && magic.generateMap(),
        }
      );
    },
  };
};

var acorn = require("acorn");
var jsx = require("acorn-jsx");
acorn.Parser.extend(jsx()).parse("my(, 'code');");

for (let token of acorn.tokenizer(str)) {
  // iterate over the tokens
}

// transform code to array of tokens:
var tokens = [...acorn.tokenizer(str)];