Array.prototype.flat limited depth to 21

[PKrasinski]

⚙ Compilation target

ES2019

⚙ Library

es2019

Missing / Incorrect Definition

Array.prototype.flat definition is supporting depth only up to 21. Over 21 return wrong type.

Sample Code

const foo = [ [ ['string' ] ] ]
const flatFoo = foo.flat(22) // string[][][] should be string[]

Documentation Link

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/flat

[MartinJohns]

Anyone who has arrays with such a depth needs to take a very good look at itself in the mirror.