Fix exports in discount-code-importer module

[ajimae]

Summary

Fix issues with modules not exporting directly as default exports in @commercetools/discount-code-importer package.

Completed tasks

• use preconstruct and rollup bundler to bundle module
• remove the direct babel module bunder

[changeset-bot]

⚠️ No Changeset found

Latest commit: 22b4491

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[codecov]

Codecov Report

Merging #1879 (804c7ca) into master (2175f68) will not change coverage.
The diff coverage is n/a.

❗ Current head 804c7ca differs from pull request most recent head 70b1d22. Consider uploading reports for the commit 70b1d22 to get more accurate results

@@           Coverage Diff           @@
##           master    #1879   +/-   ##
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  Coverage   94.73%   94.73%           
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  Files         147      147           
  Lines        5031     5031           
  Branches     1371     1371           
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  Hits         4766     4766           
  Misses        262      262           
  Partials        3        3           

[islam3zzat]

Could we make it consistent with other packages?
I notice that most of the importer/exporter package have a consistent structure

nodejs/packages/custom-objects-importer/package.json

Line 12 in 804c7ca

"main": "lib/main.js",

https://github.com/commercetools/nodejs/blob/804c7ca8bf62d248e764ed999168f9f149f3bc4a/packages/category-exporter/package.json#L12C4-L12C25

nodejs/packages/customer-groups-exporter/package.json

Line 12 in 804c7ca

"main": "lib/main.js",

nodejs/packages/custom-objects-exporter/package.json

Line 12 in 804c7ca

"main": "lib/main.js",

[ajimae]

Sure I will look at it now