chore(deps): Add tslib and use importHelpers in tsconfig.base.json

[Boshen]

closes #3740

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
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] 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?

Does this PR introduce a breaking change?

[ ] Yes
[*] No

Other information

[Boshen]

977,455 bytes -> 961,182 bytes 1.66% reduction

[coveralls]

Pull Request Test Coverage Report for Build 11551

• 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 95.436%

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Totals
Change from base Build 11535:	0.0%
Covered Lines:	4475
Relevant Lines:	4689

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💛 - Coveralls

[kamilmysliwiec]

What about individual package.json files (example https://github.com/nestjs/nest/blob/master/packages/common/package.json)? We should add tslib there as well.

[Boshen]

@kamilmysliwiec Done. There seems to be an extra packages/common/package-lock.json file, I've removed it in this PR, it was introduced in commit 1f83167

[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.