New Rule: prefer-exponentiation-operator

Please describe what the rule should do:

ES2016 adds an exponentiation operator **; this may be preferred over using Math.pow(). The rule should disallow the use of the Math.pow() function, in favor of using **.

What category of rule is this? (place an “X” next to just one item)

[ ] Enforces code style [ ] Warns about a potential error [x] Suggests an alternate way of doing something [ ] Other (please specify:)

Provide 2-3 code examples that this rule will warn about:

// Good
const a = 5 ** 7

// Bad
const a = Math.pow(5, 7)

Why should this rule be included in ESLint (instead of a plugin)?

This is a ES2016 feature, which can replace an older way of doing things. There should be a rule to force upgrading code; similar to how ESLint has no-var, prefer-spread, etc.

[mysticatea]

I’ll champion this proposal. I like the rule name prefer-exponentiation-operator and it has autofix. That rule will encourage to learn the new syntax.

[izayl]

https://stackoverflow.com/questions/41679191/why-is-math-pow-sometimes-not-equal-to-in-javascript

According to this questions, use Math.pow() is safer than **.