feature(common): accept export abstract class

[jbpionnier]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[x] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Accept export Abstract class in the @module

@Module({
  providers: [
    {
      provide: MyAbstractFooClass,
      useValue: new MyImplFooClass(),
    },
  ],
  exports: [
    MyAbstractFooClass,
  ],

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[coveralls]

Pull Request Test Coverage Report for Build 1170

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 93.631%

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Totals
Change from base Build 1167:	0.0%
Covered Lines:	2659
Relevant Lines:	2781

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💛 - Coveralls

[kamilmysliwiec]

Thanks @jbpionnier!

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.