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Regarding the module.filename problem - you can read this discussion or just that comment: https://github.com/webpack/webpack/issues/1599#issuecomment-328540024

quote:

aprilmintacpineda commented

for those having this issue, it is also good to note that module.filename would be undefined if you bundled your files. In my case it was undefined and I fixed it by simply replacing it with __filename which yields the same outcome.

So you should be able to replace path.basename(module.filename); with path.basename(__filename);.

But it still would be a bundled js file in /dist folder and your models are in /postgres/models folder, as I understand.

1) To not to automatically load your models, but directly require all necessary models.

assuming this file's path is /postgres/models/index.js and actual models are in the same folder not tested