[PR WELCOME] Angular package format 5: Metadata version mismatch

Type of Issue

This is not a real bug/feature, but I want to show that libs built with Angular package format 5 (ng-packgr 2.0.0-rc.4) don’t compile with Angular 4 + AOT. When you try to build your project with Angular 4 and AOT you’ll get this error: Angular package format 5: Error: Metadata version mismatch for module "..." found version 4, expected 3

However, both Angular 4 (only JIT, but not AOT) and Angular 5 will work without problems.

This could be a problem, because If you have a library you cannot remove Angular 4 support today.

Version Information

ng-packagr: v2.0.0-rc.4
node: v8.9.0
@angular: v4.4.6
rxjs: latest version
zone.js: latest version

[dherges]

It’s not really deprecated. It’s just an “older” version which you can keep using.

If you go dual-support different Angular versions, you also likely have support branches like version/4.x, version/5.x, master, and so on. If you do so, I’d keep on the version/4.x the 1.x dependency and on version/5.x the 2.x (rcs).

At most, we can print an error message or fail the build, when compilation encounters Angular 4 sources.

[github-actions[bot]]

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