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# es/no-keyword-properties
> disallow reserved words as property names
- ✅ The following configurations enable this rule: `plugin:es/no-new-in-es5` and `plugin:es/restrict-to-es3`
This rule reports ES5 reserved words as property names as errors.
## Examples
⛔ Examples of **incorrect** code for this rule:
<eslint-playground type="bad" code="/*eslint es/no-keyword-properties: error */
var a = { if: 1, class: 2 }
a.if = 2
a.class = 3
" />
## 📚 References
- [Rule source](https://github.com/mysticatea/eslint-plugin-es/blob/v4.1.0/lib/rules/no-keyword-properties.js)
- [Test source](https://github.com/mysticatea/eslint-plugin-es/blob/v4.1.0/tests/lib/rules/no-keyword-properties.js)
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