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## Summary This PR has breadth, but not depth. This adds 3 new `eslint` rules. The first two protect against the use of code generated from strings (`eval` and friends), which will not work client-side due to our CSP, and is not something we wish to support server-side. The last rule aims to prevent a subtle class of bugs, and to defend against a subset of prototype pollution exploits: - `no-new-func` to be compliant with our CSP, and to prevent code execution from strings server-side: https://eslint.org/docs/latest/rules/no-new-func - `no-implied-eval` to be compliant with our CSP, and to prevent code execution from strings server-side: https://eslint.org/docs/latest/rules/no-implied-eval. Note that this function implies that it prevents no-new-func, but I don't see [test cases](https://github.com/eslint/eslint/blob/main/tests/lib/rules/no-implied-eval.js) covering this behavior, so I think we should play it safe and enable both rules. - `no-prototype-builtins` to prevent accessing shadowed properties: https://eslint.org/docs/latest/rules/no-prototype-builtins In order to be compliant with `no-prototype-builtins`, I've migrated all usages and variants of `Object.hasOwnProperty` to use the newer [`Object.hasOwn`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwn). |
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