problem: couldn't parse this bundle about browser-unpack HOT 1 OPEN

Are you still having this error? Your problem is that your input bundle is not a file. The AST is a list of the statements in your js file,

for example:

1|  console.log("foo");
2|
3|  if (window.location !== "bar") {
4|    var a = 3;
5|    alert(a);
6|  }

would return an ast.body of length 2 (one element is an ExpressionStatement for line 1, one is an IfStatement for lines 3-6)

A bundle needs to be a single UnaryExprssion. Specifically, it should looks like the output of browserify or similar

(function e(t,n,r){/*A COUPLE LINES OF MAGIC*/})(
     //ALL OF YOUR CODE
);

from browser-unpack.