Function Object start

function_object.rs

use crate::environment::lexical_environment::Environment;
use crate::js::value::ValueData;
use crate::syntax::ast::expr::Expr;
/// Sets the functionKind
#[derive(Debug, Copy, Clone)]
pub enum FunctionKind {
    Normal,
    ClassConstructor,
    Generator,
    Async,
    AsyncGenerator,
}
/// Sets the ConstructorKind
#[derive(Debug, Copy, Clone)]
pub enum ConstructorKind {
    Base,
    Derived,
}
/// Defines how this references are interpreted within the formal parameters and code body of the function.
#[derive(Debug, Copy, Clone)]
pub enum ThisMode {
    Lexical,
    Strict,
    Global,
}