repl2 for JScript (windows10 only)

jsconsole.example.txt

C:\Users\user\Desktop>cscript jsconsole.js //E:{1b7cd997-e5ff-4932-a7a6-2a9e636da385}
Microsoft (R) Windows Script Host Version 5.812
Copyright (C) Microsoft Corporation. All rights reserved.

> var a = 1

> a
1
> const b = 2

> b
'b' is undefined
> const b = 10;a + b
11
> let c = 100\n
> let d = 200\n
> c*d
20000
> ^Z
Bye.

jsconsole.js

const g = function*(___){
	while(true)
		try {
			___ = eval(yield ___)
		} catch(error) {
			___ = {error}
		}
}()
g.next()

!function(){
	const stdin = WScript.StdIn
	const stdout = WScript.StdOut
	
	let str = ""
	let neos = true
	while (neos){
		stdout.Write("> ")
		if (neos = !stdin.AtEndOfStream) {
			str += stdin.ReadLine()
			if (str.endsWith("\\n")) {
				str = str.replace(/\\n$/, "\n")
				continue
			}
			
			const result = g.next(str).value
			if (result && result.error) {
				stdout.WriteLine(result.error.message)
			} else {
				try {
					stdout.WriteLine(result)
				} catch (err) {
					stdout.WriteLine("Cannot print")
				}
			}
			str = ""
		} else {
			stdout.WriteLine("Bye.")
		}
	}
}()