Add option to publish a library built with ivy

Type of Issue

[x] Feature Request

Description

I have a library that is only for ivy, it uses ivy APIs that are not available in previous versions of the framework. When I tried to publish it, I get the message:

info: err > ERROR: Trying to publish a package that has been compiled by Ivy. This is not allowed. Please delete and rebuild the package, without compiling with Ivy, before attempting to publish.

Expected Behaviour

I should be able to publish my library for ivy anyway. I understand that it should be opt-in only because we want to avoid errors, but there should be a better way to allow that than to force me to manually edit the package.json file every time I want to build/publish my lib. Ideally there should be an option in ng-package.json to do that.

Version Information

$ node_modules/.bin/ng-packagr --version
ng-packagr:            5.7.1
@angular/compiler:     9.0.0-rc.5
rollup:                1.25.2
tsickle:               0.37.1
typescript:            3.6.4

cc @alan-agius4

[benjamincharity]

@ocombe IMO this should be re-opened. 🙏 I’m not sure what the benefit is for ng-packagr to enforce this limitation. The error makes it sound as if the infrastructure itself doesn’t support Ivy code.

This is giving me flashbacks to the ‘peer dependency vs bundled’ discussions. Best practices do exist, but I’m not sure it should be this tools job to enforce them. This situation feels very similar. Sure, 90% of people should not be publishing public Ivy packages. But as I’ve seen through discussions here and in the Angular issues, there are many teams building and publishing internal packages. AFAIK for those packages only consumed by Ivy applications, there is no actual benefit for consuming VE code vs Ivy code.

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Either way, much love and appreciation for all those involved with this tool! ❤️

[michib]

npm publish --ignore-scripts ignores the prepublishOnly Script (also every other script, but my publishable package.json does not contain any other scripts)