ESP8266 & AVR under the Arduino IDE fails when setting a variable

[sfranzyshen]

LINUX_DIST="Linux Mint 18.3 Sylvia MATE 32-bit"
KERNEL=Linux computer 4.10.0-38-generic i686 i686 i686 GNU/Linux

ARDUINO IDE: 1.8.10 (32bit)
Elk Library: release 0.0.16 (Installed manually into Arduino IDE library folder)
ESP8266 BOARD: 2.5.2 (Installed with board manager from Arduino IDE)
Arduino Boards: 1.8.1 (Installed with board manager from Arduino IDE)
ESP32 Board: 1.0.4 (Installed with board manager from Arduino IDE)

Test Code

#include "elk.h"  // Add Elk library

extern "C" void myDelay(int milli) {
  delay(milli);
}
extern "C" void myWrite(int pin, int val) {
  digitalWrite(pin, val);
}
extern "C" void myMode(int pin, int mode) {
  pinMode(pin, mode);
}

struct js *js;

void setup() {
  Serial.begin(115200);
  Serial.println();
  js = js_create(malloc(700), 700);
  Serial.println("malloc done");
  js_import(js, "delay", (uintptr_t) myDelay, "vi");
  js_import(js, "digitalWrite", (uintptr_t) myWrite, "vii");
  js_import(js, "pinMode", (uintptr_t) myMode, "vii");
  Serial.println("imports done");

  js_eval(js, "let pin = 2;", 0);  // <--- HERE IS THE PROBLEM ON ESP8266 & AVR

  js_eval(js, "pinMode(2, 1);", 0);  // Set LED pin to OUTPUT mode ... on esp32 set to (pin, 2)
  js_eval(js, "let loop = function() { delay(200); digitalWrite(2, 1); delay(200); digitalWrite(2, 0); };", 0);

  Serial.println("ready ... looping");
}

void loop() {
  js_eval(js, "loop();", 0);
  Serial.println(" ... looping");
}

This functions as expected on the esp32 platform ... and when I eliminate the variable from the digitalWrite function calls and remark-out the "let pin = 2" js_eval call ... everything works as expected on the esp8266 & arv platforms ... so it's defiantly the "let pin = 2;" variable setting call that's causing things to bork on the esp8266 & avr platforms ...

UPDATE: on the avr platform it reboots ... on the esp8266 it ignores any js_evals after the "let pin = 2" call ... update update ... if I don't try to access the variable ... no reboot happens ... but still doesn't function ... just setting the variable causes it to fail ...

[cpq]

Updated API a bit.
Updated an example to use variables and printing stats to the serial.
Pushed version 17.