Use jQuery.slim

Underscore.js _.uniq(_.compact( to native Array.filter((value, index, self) => !!value && self.indexOf(value) == index)
Underscore.js _.compact to native Array.filter(value => !!value)
Underscore.js _.uniq to native Array.filter((value, index, self) => self.indexOf(value) == index)
Underscore.js _.values to native Object.values
Underscore.js _.flatten to native Array.flat
Underscore.js _.union to native Array.concat + unique filter
Underscore.js _.reduce to native Array.reduce
Underscore.js _.escape replaced with advanced htmlspecialchars()
Underscore.js _.memoize replaced
Now Underscore.js is a slim custom version (only _.debounce, _.defer & _.throttle)

vendors/underscore/underscore-min.custom.js

@@ -0,0 +1,6 @@
+//     Underscore.js 1.9.2
+//     https://underscorejs.org
+//     (c) 2009-2018 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
+//     Underscore may be freely distributed under the MIT license.
+
+(()=>{var e=function(t){return t instanceof e?t:this instanceof e?void 0:new e(t)};"undefined"==typeof exports||exports.nodeType?("object"==typeof self&&self.self===self&&self||"object"==typeof global&&global.global===global&&global||this||{})._=e:("undefined"!=typeof module&&!module.nodeType&&module.exports&&(exports=module.exports=e),exports._=e);e.VERSION="1.9.2";var t=function(e,t,n,o,l){if(!(o instanceof t))return e.apply(n,l);var r,u="object"!=typeof(r=e.prototype)?{}:Object.create(r),i=e.apply(u,l);return"object"==typeof i?i:u};e.defer=(()=>{var e=(e,t,...n)=>setTimeout(()=>e.apply(null,n),t),n=function(...o){for(var l=0,r=[o[l++],1];l<o.length;)r.push(o[l++]);return t(e,n,this,this,r)};return n})(),e.throttle=function(e,t,n){var o,l,r,u,i=0;n||(n={});var a=function(){i=!1===n.leading?0:Date.now(),o=null,u=e.apply(l,r),o||(l=r=null)},f=function(){var f=Date.now();i||!1!==n.leading||(i=f);var p=t-(f-i);return l=this,r=arguments,p<=0||p>t?(o&&(clearTimeout(o),o=null),i=f,u=e.apply(l,r),o||(l=r=null)):o||!1===n.trailing||(o=setTimeout(a,p)),u};return f.cancel=function(){clearTimeout(o),i=0,o=l=r=null},f},e.debounce=function(e,t,n){var o,l,r=function(t,n){o=null,n&&(l=e.apply(t,n))},u=function(...u){if(o&&clearTimeout(o),n){var i=!o;o=setTimeout(r,t),i&&(l=e.apply(this,u))}else{var a=this;o=setTimeout(()=>r.apply(null,[a,u]),t)}return l};return u.cancel=function(){clearTimeout(o),o=null},u},"function"==typeof define&&define.amd&&define("underscore",[],function(){return e})})();

vendors/underscore/underscore.custom.js

@@ -0,0 +1,169 @@
+//     Underscore.js 1.9.2
+//     https://underscorejs.org
+//     (c) 2009-2018 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
+//     Underscore may be freely distributed under the MIT license.
+/*
+_.debounce
+_.defer
+_.throttle
+*/
+
+(() => {
+
+  // Baseline setup
+  // --------------
+
+  // Create a safe reference to the Underscore object for use below.
+  var _ = function(obj) {
+    if (obj instanceof _) return obj;
+    if (!(this instanceof _)) return new _(obj);
+  };
+
+  // Export the Underscore object for **Node.js**, with
+  // backwards-compatibility for their old module API. If we're in
+  // the browser, add `_` as a global object.
+  // (`nodeType` is checked to ensure that `module`
+  // and `exports` are not HTML elements.)
+  if (typeof exports != 'undefined' && !exports.nodeType) {
+    if (typeof module != 'undefined' && !module.nodeType && module.exports) {
+      exports = module.exports = _;
+    }
+    exports._ = _;
+  } else {
+    // Establish the root object, `window` (`self`) in the browser, `global`
+    // on the server, or `this` in some virtual machines. We use `self`
+    // instead of `window` for `WebWorker` support.
+    var root = typeof self == 'object' && self.self === self && self ||
+            typeof global == 'object' && global.global === global && global ||
+            this ||
+            {};
+    root._ = _;
+  }
+
+  // Current version.
+  _.VERSION = '1.9.2';
+
+  // An internal function for creating a new object that inherits from another.
+  var baseCreate = function(prototype) {
+    if (typeof prototype !== 'object') return {};
+    return Object.create(prototype);
+  };
+
+  // Function (ahem) Functions
+  // ------------------
+
+  // Determines whether to execute a function as a constructor
+  // or a normal function with the provided arguments.
+  var executeBound = function(sourceFunc, boundFunc, context, callingContext, args) {
+    if (!(callingContext instanceof boundFunc)) return sourceFunc.apply(context, args);
+    var self = baseCreate(sourceFunc.prototype);
+    var result = sourceFunc.apply(self, args);
+    return (typeof result === 'object') ? result : self;
+  };
+
+  // Defers a function, scheduling it to run after the current call stack has
+  // cleared.
+  _.defer = (() => {
+	var func = (func, wait, ...args) => setTimeout(() => func.apply(null, args), wait);
+    var bound = function(...params) {
+      var position = 0;
+      var args = [params[position++], 1];
+      while (position < params.length) args.push(params[position++]);
+      return executeBound(func, bound, this, this, args);
+    };
+    return bound;
+  })();
+
+  // Returns a function, that, when invoked, will only be triggered at most once
+  // during a given window of time. Normally, the throttled function will run
+  // as much as it can, without ever going more than once per `wait` duration;
+  // but if you'd like to disable the execution on the leading edge, pass
+  // `{leading: false}`. To disable execution on the trailing edge, ditto.
+  _.throttle = function(func, wait, options) {
+    var timeout, context, args, result;
+    var previous = 0;
+    if (!options) options = {};
+
+    var later = function() {
+      previous = options.leading === false ? 0 : Date.now();
+      timeout = null;
+      result = func.apply(context, args);
+      if (!timeout) context = args = null;
+    };
+
+    var throttled = function() {
+      var now = Date.now();
+      if (!previous && options.leading === false) previous = now;
+      var remaining = wait - (now - previous);
+      context = this;
+      args = arguments;
+      if (remaining <= 0 || remaining > wait) {
+        if (timeout) {
+          clearTimeout(timeout);
+          timeout = null;
+        }
+        previous = now;
+        result = func.apply(context, args);
+        if (!timeout) context = args = null;
+      } else if (!timeout && options.trailing !== false) {
+        timeout = setTimeout(later, remaining);
+      }
+      return result;
+    };
+
+    throttled.cancel = function() {
+      clearTimeout(timeout);
+      previous = 0;
+      timeout = context = args = null;
+    };
+
+    return throttled;
+  };
+
+  // Returns a function, that, as long as it continues to be invoked, will not
+  // be triggered. The function will be called after it stops being called for
+  // N milliseconds. If `immediate` is passed, trigger the function on the
+  // leading edge, instead of the trailing.
+  _.debounce = function(func, wait, immediate) {
+    var timeout, result;
+
+    var later = function(context, args) {
+      timeout = null;
+      if (args) result = func.apply(context, args);
+    };
+
+    var debounced = function(...args) {
+      if (timeout) clearTimeout(timeout);
+      if (immediate) {
+        var callNow = !timeout;
+        timeout = setTimeout(later, wait);
+        if (callNow) result = func.apply(this, args);
+      } else {
+        var obj = this;
+        timeout = setTimeout(() => later.apply(null, [obj, args]), wait);
+      }
+
+      return result;
+    };
+
+    debounced.cancel = function() {
+      clearTimeout(timeout);
+      timeout = null;
+    };
+
+    return debounced;
+  };
+
+  // AMD registration happens at the end for compatibility with AMD loaders
+  // that may not enforce next-turn semantics on modules. Even though general
+  // practice for AMD registration is to be anonymous, underscore registers
+  // as a named module because, like jQuery, it is a base library that is
+  // popular enough to be bundled in a third party lib, but not be part of
+  // an AMD load request. Those cases could generate an error when an
+  // anonymous define() is called outside of a loader request.
+  if (typeof define == 'function' && define.amd) {
+    define('underscore', [], function() {
+      return _;
+    });
+  }
+})();