This repo reproduces an issue with core-js in Sequelize 6.0.0 beta. The issue is caused by incompatibility of _.isNative() and core-js polyfill.
From _.isNative() docs:
This method can't reliably detect native functions in the presence of the core-js package because core-js circumvents this kind of detection. Despite multiple requests, the core-js maintainer has made it clear: any attempt to fix the detection will be obstructed. As a result, we're left with little choice but to throw an error. Unfortunately, this also affects packages, like babel-polyfill, which rely on core-js.
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Install dependencies:
$ yarn
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Build:
$ yarn build
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Execute:
$ node dist/index.js