# es/no-optional-chaining
disallow optional chaining
- ✅ The following configurations enable this rule:
plugin:es/no-new-in-es2020,plugin:es/restrict-to-es3,plugin:es/restrict-to-es5,plugin:es/restrict-to-es2015,plugin:es/restrict-to-es2016,plugin:es/restrict-to-es2017,plugin:es/restrict-to-es2018, andplugin:es/restrict-to-es2019
This rule reports ES2020 Optional Chaining (opens new window) as errors.
# Examples
⛔ Examples of incorrect code for this rule:
/*eslint es/no-optional-chaining: error */
var x = a?.b
var x = a?.[b]
foo?.()
👌 Examples of correct code for this rule:
/*eslint es/no-optional-chaining: error */
var x = a != null ? a.b : undefined
var x = a && a.b
var x = a != null ? a[b] : undefined
var x = a && a[b]
foo && foo()