Default parameters is missing

[azu]

espurify ignore .default property by default.
Is it expected bahavior?

"use strict";
const esprima = require("esprima");
const escodegen = require("escodegen");
const espurify = require('espurify');

var code = `function addPrefix(text, prefix = "Default:") {
                return prefix + text;
            }`;
const jsAst = esprima.parse(code);
const modifiedAst = espurify(jsAst);
console.log(escodegen.generate(modifiedAst));
/*
 function addPrefix(text, prefix) { // <= no default parameter
     return prefix + text;
 }
 */

• https://tonicdev.com/578c3e2bccf2c41300e5e6a7/579ab778edc3e41200ab1e31

[twada]

espurify is intended to be compliant with The ESTree Spec.
defaults properly of Function(Declaration|Expression) is not in the spec, so it is discarded by default.

• estree/spec.md
• estree/es6.md

If you want to purify non-complient tree, please use espurify.cloneWithWhitelist function.