fix: guard optional Babel dependency tracking API

[longnt0108]

Summary

• Guard api.addExternalDependency so older Babel API objects do not throw.
• Add regression coverage for Babel API versions without addExternalDependency.

Tests

• yarn test
• yarn lint

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (24b7af1) to head (b285d18).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #573   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           84        85    +1     
=========================================
+ Hits            84        85    +1     

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[longnt0108]

Hi, this fixes compatibility with older Babel API objects where api.addExternalDependency is unavailable. I added a regression test and verified
yarn test and yarn lint locally.

[goatandsheep]

Hi @longnt0108 this seems fine. What versions of Babel are you targeting? This feature was added quite a while back.