Got `nextTick is not a function` when using 7.1.0

Original error message is `l is not a function` pointing to the following minified code:
```javascript
f.setImmediate="function"===typeof r?r:function(a){var b=D++,c=2>arguments.length?!1:m.call(arguments,1);n[b]=!0;l(function(){n[b]&&(c?a.apply(null,c):a.call(null),f.clearImmediate(b))});return b}
```

After generating a not minified file, I found the following function:
```js
exports.setImmediate = typeof setImmediate === "function" ? setImmediate : function(fn) {
var id = nextImmediateId++;
var args = arguments.length < 2 ? false : slice.call(arguments, 1);

immediateIds[id] = true;

nextTick(function onNextTick() {
if (immediateIds[id]) {
// fn.call() is faster so we optimize for the common use-case
// @see http://jsperf.com/call-apply-segu
if (args) {
fn.apply(null, args);
} else {
fn.call(null);
}
// Prevent ids from leaking
exports.clearImmediate(id);
}
});

return id;
};
```