fix: don't sync constructor package on exists mode

[fengmk2]

closes #857

[mention-bot]

By analyzing the blame information on this pull request, we identified @dead-horse to be a potential reviewer

[fengmk2]

cc @glen-84

[codecov-io]

Current coverage is 88.18%

Merging #883 into master will increase coverage by +0.03% as of 2eb8d88

@@            master    #883   diff @@
======================================
  Files           85      85       
  Stmts         3250    3250       
  Branches       602     602       
  Methods          0       0       
======================================
+ Hit           2865    2866     +1
  Partial         17      17       
+ Missed         368     367     -1

Review entire Coverage Diff as of 2eb8d88

---

Uncovered Suggestions

1. +0.28% via .../web/package/show.js#159...167
2. +0.28% via ...ync_module_worker.js#432...440
3. +0.22% via services/npm.js#126...132
4. See 7 more...

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[fengmk2]

2.9.4

[glen-84]

Thank you so much! I will test this early next week.

[glen-84]

Verified fixed. 👍