acorn.Parser.extend(jsx({ allowNamespacedObjects: true }))

const acornAst = recast.parse(source, {
  parser: {
    parse(source) {
      return require("acorn").parse(source, {
        // additional options
      });
    }
  }
});

const acornAst = recast.parse(source, {
  parser: require("acorn")
});

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

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