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title: Disallow Use of __proto__ (no-proto)
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# Disallow Use of \_\_proto\_\_ (no-proto)

Prevents using the obsolete `__proto__` property, which was deprecated in ECMAScript 3.1. Use `Object.getPrototypeOf()` instead. This is a standard rule built into ESLint.

For complete details about this rule, including examples, see the corresponding ESLint documentation, [Disallow Use of \_\_proto\_\_ (no-proto)](https://eslint.org/docs/rules/no-proto).