Building Angular 10 app shows incomplete "Warning in" messages

[KShewengger]

🐞 Bug report

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Is this a regression?

Yes

Description

Whenever I tried to build my app, there are warning in relevance to "Fix CommonJS or AMD dependencies can cause optimization bailouts" and incomplete "Warning in" message but the first one is now resolved through editing the angular.json and add this line right here:

"allowedCommonJsDependencies": [
        "..."
 ]

But the 2nd issue - incomplete "Warning in" messages still persists. With this, would like to be guided.

🔬 Minimal Reproduction

It is through when running ng build --prod but since the warning shown is incomplete, I'm quite not sure when does it persist but these are the list of packages that I have added under allowedCommonJsDependencies

"allowedCommonJsDependencies": [
              "ngx-lightbox",
              "ngx-flickity",
              "lodash",
              "flickity",
              "flickity-imagesloaded",
              "imagesloaded/imagesloaded"
 ]

🔥 Exception or Error

🌍 Your Environment

Angular CLI: 10.0.2
Node: 12.11.1
OS: macOS Catalina
Angular: 10.0.3

[alan-agius4]

This seems like a bug but we'll need to look at a reproduction to find and fix the problem. Can you setup a minimal repro please or share the project even privately?

You can read here why this is needed. A good way to make a minimal repro is to create a new app via ng new repro-app and adding the minimum possible code to show the problem. Then you can push this repository to github and link it here.

[rurku]

I've seen this too with version 10.0.2 and I tried to track it down.
I'm pretty sure it was introduced in Pull Request #18097 . Looks like child warnings are not correctly appended to the array. The number of "WARNING in" messages matched the number of children in stats.json and the children had no warnings ("warnings": []).
But I had trouble reproducing it in a fresh project - it also had children with "warnings": [] in stats.json but it did not show the empty warning messages on production build.
So there must be more to it.

[alan-agius4]

@rurku, that’s really good info.