Function instanceWatch

web/main.js:2298–2312

(source, value, options)

  return watchHandle;
}
function instanceWatch(source, value, options) {
  const publicThis = this.proxy;
  const getter = isString(source) ? source.includes(".") ? createPathGetter(publicThis, source) : () => publicThis[source] : source.bind(publicThis, publicThis);
  let cb;
  if (isFunction(value)) {
    cb = value;
  } else {
    cb = value.handler;
    options = value;
  }
  const reset = setCurrentInstance(this);
  const res = doWatch(getter, cb.bind(publicThis), options);
  reset();
  return res;
}
function createPathGetter(ctx, path) {
  const segments = path.split(".");
  return () => {