fix(build): fix fail on target=es6

[Domainv]

Closes #5086

For testing:

• npm run build
• ./tsconfig.json change target to es6
• ng serve

PR Checklist

Before creating new PR, please take a look at checklist below to make sure that you've done everything that needs to be done before we can merge it.

• read and followed the CONTRIBUTING.md guide.
• built and tested the changes locally.
• added/updated tests.
• added/updated API documentation.
• added/updated demos.

[codecov]

Codecov Report

Merging #5123 into development will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #5123   +/-   ##
============================================
  Coverage        51.51%   51.51%           
============================================
  Files                3        3           
  Lines               99       99           
  Branches            17       17           
============================================
  Hits                51       51           
  Misses              38       38           
  Partials            10       10

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c2d1c39...14b326c. Read the comment docs.

[ludmilanesvitiy]

Smoke tested, looks good.