Found the ESLint plugin preventing mutation in Object.assign()call if anyone is interested:

Jan 14, 2019

1 min read

…ode review, to avoid this pitfall. Notice that using const foo did not prevented from modifying it. I haven’t found an ESLint rule that would prevent modification of first parameter in Object.assing() call.

Use JS object spread operator instead of Object.assign() pattern in Node 8

Adam Brodziak

Found the ESLint plugin preventing mutation in Object.assign()call if anyone is interested:

https://github.com/jfmengels/eslint-plugin-fp/blob/master/docs/rules/no-mutating-assign.md

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Adam Brodziak