API options

Function.isThisArgumentExpected(func) static method

See #3

thisArgumentExpected own property

Semantics

let pd = Object.getOwnPropertyDescriptor(callable, 'thisArgumentExpected')
pd.enumerable // false
pd.writable // false
pd.configurable // true
pd.value // true | false | null

pd.value:

• class constructor => null
• bound function => false
• arrow function => false
• explicit this (gilbert/es-explicit-this proposal) => true
• implicit this (FunctionBody contains this or super.foo) => true
• otherwise => false

Some complex examples

function f() {
  return function () {
    return () => this
  }
}
f.thisArgumentExpected // false
f().thisArgumentExpected // true
f()().thisArgumentExpected // false

let o = {
  m(x = () => super.foo) {}
}
o.m.thisArgumentExpected // true