# es/no-array-prototype-indexof

disallow the Array.prototype.indexOf method

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

This rule reports ES5 Array.prototype.indexOf method as errors.

This rule is silent by default because it's hard to know types. You need to configure the aggressive mode or TypeScript in order to enable this rule.

# 💡 Examples

⛔ Examples of incorrect code for this rule:

/*eslint es/no-array-prototype-indexof: [error, { aggressive: true }] */ foo.indexOf(0)
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# 🔧 Options

This rule has an option.

  es/no-array-prototype-indexof: [error, { aggressive: false }]

# aggressive: boolean

Configure the aggressive mode for only this rule. This is prior to the settings.es.aggressive setting.

# 📚 References