Fn is not a function

[netdown]

Hi,

I'm not sure about the reasons, but in my setup, the latest release (2.2.3) does not work. The problem is that the steps array in _runUpload2 function has empty values and these empty values are invoked as functions.

This is caused by line
const steps = [..._classPrivateFieldLooseBase(this, _preProcessors)[_preProcessors], ..._classPrivateFieldLooseBase(this, _uploaders)[_uploaders], ..._classPrivateFieldLooseBase(this, _postProcessors)[_postProcessors]];
being changed to
const steps = [...Array.from(_classPrivateFieldLooseBase(this, _preProcessors)[_preProcessors]), ...Array.from(_classPrivateFieldLooseBase(this, _uploaders)[_uploaders]), ...Array.from(_classPrivateFieldLooseBase(this, _postProcessors)[_postProcessors])];

The first would result [fn()], the seconds results [Set(0), Set(1), Set(0)].

[Murderlon]

Related to: #3297

@aduh95 should we simply revert this?

[jlowcs]

That revert might actually have broken our own app. We are now seeing d is not a function in our babel/webpack-built app.

The error happens in loggers.js, but that could be triggered by an issue with the spread operator.

[jlowcs]

I'm not sure I understand the issue you were experiencing @netdown

Would rewriting the code this way work better while still allowing ES5 support?

    const steps = [
      ...this.#preProcessors.values(),
      ...this.#uploaders.values(),
      ...this.#postProcessors.values(),
    ]