ESLINT：防止使用双感叹号（！！）

Question

What is the rule and configuration required to stop eslint (when using eslint --fix ) from changing:

return regex.test(foo) ? true : false

into this:

return !!regex.test(postalCode)

While I understand what this rule is doing, I don't like it. I thought it might be one of these -- however, it's either neither, or I just fail to understand how to configure them correctly.

• no-implicit-coercion
• no-extra-boolean-cast

// eslintrc.js

module.exports = {
  rules: {
    'no-implicit-coercion': [2, { string: false, boolean: false, number: false }],
    'no-extra-boolean-cast': [2, { enforceForLogicalOperands: true }],
  }
}

Answer 1

Looks like no-unneeded-ternary is converting this, as it is ultimately superfluous and can be written more cleanly and succinctly without a ternary. That said, as Salman A points out in the comments , it is somewhat curious that the fix itself is leveraging what is considered a bad practice of the !! Boolean casting.