fix(toImport): handle comma-separated declaration exports

[cernymatej]

fix #490

This fixes a problem where we didn't handle exports like this:

export const FOO='foo',BAR='bar'

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.12%. Comparing base (a4a5e0a) to head (7dedb09).
⚠️ Report is 144 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #491      +/-   ##
==========================================
- Coverage   98.73%   95.12%   -3.61%     
==========================================
  Files          14       13       -1     
  Lines        1817      964     -853     
  Branches      374      327      -47     
==========================================
- Hits         1794      917     -877     
- Misses         23       44      +21     
- Partials        0        3       +3     

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