in src/common/builder.js [47:58]
function assignOrWrapInDeprecateGetter (obj, key, value, message) {
if (message) {
utils.defineGetter(obj, key, function () {
console.log(message);
delete obj[key];
clobber(obj, key, value);
return value;
});
} else {
clobber(obj, key, value);
}
}