Minifying ExcelJS fails

Installed product versions

Visual Studio: 2022 Professional
This extension: 2.9.3

Description

Minifying of ExcelJs fails with error message:

Strict-mode does not allow assignment to undefined variables: regeneratorRuntime

Steps to recreate

Add the lib from a cdn with libman.json:

{
  "version": "1.0",
  "defaultProvider": "cdnjs",
  "libraries": [
    {
      "provider": "cdnjs",
      "library": "exceljs@4.3.0",
      "destination": "wwwroot/js/lib/exceljs/",
      "files": [
        "exceljs.min.js",
        "exceljs.js"
      ]
    }
  ]
}

Now create a bundle for the lib:

bundleconfig.json

[
  {
    "outputFileName": "wwwroot/js/vendor.js",
    "inputFiles": [
      "wwwroot/js/lib/exceljs/exceljs.js"
    ]
  }
]

The vendor.js file is created, but the Minification of vendor.js fails with the above exception.

The only solution is to add var regeneratorRuntime to the excel.js or replace the codeline:

regeneratorRuntime = runtime;

with

window.regeneratorRuntime = runtime;

but this isn't very suitable because every time anything changes in the libman.json, the file is replaced from cdnjs and you have do add the lines again.

One other "dirty solution" would to add an empty js-file which only contains the var regeneratorRuntime.

Edit: I have just added the single exceljs-lib to bundleconfig.js to keep it simply. Usually there a lot more libs.

failwyn / BundlerMinifier