Does it support minifying async/await ?

[szilardd]

I'm using your solution described here: https://stackoverflow.com/questions/37650968/are-there-any-bundletransformer-js-minifiers-that-support-es6

But If I add this to a JS file

async function test() { }

Getting this error

Message: Expected ';'
Error code: JS1004
Severity: 0
Subcategory: run-time
File: /js/main.js
Start line: 1
Start column: 6
End line: 1
End column: 6

thanks

[Taritsyn]

Hello, David!

This error occurs, because the Microsoft Ajax Minifier does not fully support ECMAScript 6 standard. Unfortunately, Microsoft Ajax Minifier library has not been developing since 2015.

To solve your problem, I recommend you to do the following:

1. Install and configure the BundleTransformer.TypeScript module.
2. Rename the *.js file, which is written in ECMAScript 6, into the *.ts.
3. Add to the Web.config file the following settings:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  …
  <bundleTransformer xmlns="http://tempuri.org/BundleTransformer.Configuration.xsd">
    …
    <typeScript target="EcmaScript5" transpileOnly="true">
      …
    </typeScript>
    …
  </bundleTransformer>
  …
</configuration>

P.S.: When I have free time, I will make a module based on the NUglify.

[szilardd]

Thanks

I'm not able to rename *.js files to *.ts but it looks like a good approach for a new project.

Main things for me are bundling and cache busting.

So I ended up disabling minification like this. Not sure if it's the best way but it works:

var bundle = new CustomScriptBundle("MyBundleName");
bundle.Include(virtualPaths); // array of paths

// disable minification because it doesn't have support for ES6
var minifier = new NullMinifier();
var transformer = new ScriptTransformer(minifier);

bundle.Transforms.Clear();
bundle.Transforms.Add(transformer);

[Taritsyn]

By the way, async/await appeared in ES2017, but not in ES6 (ES2015). In this case, even the module based on the NUglify will not help.

[Taritsyn]

Hello, David!

Try replacing the BundleTransformer.MicrosoftAjax module with the BundleTransformer.NUglify module.