# es/no-subclassing-builtins

disallow the subclassing of the built-in classes

✅ The following configurations enable this rule: plugin:es/no-new-in-es2015, plugin:es/restrict-to-es3, and plugin:es/restrict-to-es5

This rule reports ES2015 subclassing of built-in classes as errors.

The built-in classes include the following classes (constructors):

# Examples

⛔ Examples of incorrect code for this rule:

/*eslint es/no-subclassing-builtins: error */
class MyArray extends Array {
    // ...
}

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