Silence UlgifyJS warnings

[mgol]

Please provide us with the following information:

OS?

Windows 7, 8 or 10. Linux (which distribution). Mac OSX (Yosemite? El Capitan?)

macOS Sierra 10.12.1 (16B2555)

Versions.

Please run ng --version. If there's nothing outputted, please run in a Terminal: node --version and paste the result here:

angular-cli: 1.0.0-beta.19-3
node: 7.0.0
os: darwin x64

Repro steps.

Was this an app that wasn't created using the CLI? What change did you do on your code? etc.

I just invoked:

ng new test-app
cd test-app
ng build --prod --aot

The log given by the failure.

Normally this include a stack trace and some more information.

Lots of warnings like:

WARNING in main.55f62913a98db261318d.bundle.js from UglifyJs
Dropping unused function isStrictStringMap [/Users/mgol/Workspace/angular2-test/test-app/~/@angular/core/src/facade/lang.js:44,0]
Dropping unused function isDate [/Users/mgol/Workspace/angular2-test/test-app/~/@angular/core/src/facade/lang.js:47,0]
Dropping unused function setValueOnPath [/Users/mgol/Workspace/angular2-test/test-app/~/@angular/core/src/facade/lang.js:112,0]
Dropping unused function escapeRegExp [/Users/mgol/Workspace/angular2-test/test-app/~/@angular/core/src/facade/lang.js:152,0]
Side effects in initialization of unused variable STRING_MAP_PROTO [/Users/mgol/Workspace/angular2-test/test-app/~/@angular/core/src/facade/lang.js:43,0]
Side effects in initialization of unused variable NumberWrapper [/Users/mgol/Workspace/angular2-test/test-app/~/@angular/core/src/facade/lang.js:67,0]
Dropping unused function setDOM [/Users/mgol/Workspace/angular2-test/test-app/~/@angular/platform-browser/src/dom/dom_adapter.js:12,0]
Dropping unused function scheduleMicroTask [/Users/mgol/Workspace/angular2-test/test-app/~/@angular/common/src/facade/lang.js:21,0]
Dropping unused function isStrictStringMap [/Users/mgol/Workspace/angular2-test/test-app/~/@angular/common/src/facade/lang.js:44,0]
Dropping unused function looseIdentical [/Users/mgol/Workspace/angular2-test/test-app/~/@angular/common/src/facade/lang.js:100,0]

Mention any other details that might be useful.

UlgifyJS prints warnings for every piece of dead code it strips as it was a user error that some unneeded code is there. Maybe that's the case for a lot of regular projects but this is a pretty normal scenario for Angular's tree shaking. It'd be good to silence those warnings (but not potential errors) so that it doesn't look so unnecessary scary and so that it doesn't push the final Webpack output way beyond the screen.

---

Thanks! We'll be in touch soon.

[clydin]

In progress. See PR #2858

[filipesilva]

Dupe of #1836 as well.

[krismeister]

I agree this would be nice. Our automated CI tools will fail if we put verbose mode on, because of the warnings.

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