refactor: use rollup's parse function

Author: RebeccaStevens

package-lock.json

@@ -11,7 +11,6 @@
   "dependencies": {
     "@javascript-obfuscator/escodegen": "^2.3.0",
     "@rollup/pluginutils": "^4.2.1",
-    "acorn": "^8.8.0",
     "convert-source-map": "^1.8.0",
     "multi-stage-sourcemap": "^0.3.1",
     "unassert": "^2.0.0"

package.json

@@ -1,6 +1,5 @@
 
 import {createFilter} from '@rollup/pluginutils';
-import acorn from 'acorn';
 import escodegen from '@javascript-obfuscator/escodegen';
 import {unassertAst} from 'unassert';
 import convert from 'convert-source-map';
@@ -58,19 +57,8 @@ export default function unassert(options = {}) {
             if (!filter(id)) { return null; }
 
             return new Promise((resolve) => {
-                const comments = [];
-                const tokens = [];
+                const ast = this.parse(code);
 
-                const ast = acorn.parse(code, {
-                    sourceType: 'module',
-                    ecmaVersion: 'latest',
-                    locations: true,
-                    ranges: true,
-                    onComment: comments,
-                    onToken: tokens,
-                });
-
-                escodegen.attachComments(ast, comments, tokens);
                 const unassertedAst = escodegen.generate(unassertAst(ast), {
                     sourceMap: id,
                     sourceContent: code,