Remove polyfill.io

Prepare for releasing a hotfix: https://oisaur.com/@renchap/112679062235365025

Author: DmitrySharabin

CONTRIBUTING.md

@@ -140,12 +140,9 @@ This file is the entry point of Mavo and all of Mavo's components are utilized h
 * `attributes` object is an array of all attributes. It is incomplete as more are in separate JS files and are pushed later to this object.
 
 ### How Mavo Picks Up `mv-app` Elements
-1. Fetches polyfills needed ([polyfill.io](https://polyfill.io/v2/docs/)); syntax-level features cannot be polyfilled.
-    * Mavo has a list (IntersectionObserver, Symbol) that needs to be polyfilled.
-2. Adds/pushes dependencies after the polyfills are loaded.
-3. Loads Mavo plugins using `_.Plugins.load()` defined in plugins.js.
-4. `_.inited` Promise resolves after page (`$.ready`) and dependencies are ready.
-5. `_.init()` gets all elements with an `mv-app` attribute that matches the `$$` selector (using `selectors` object).
+1. Loads Mavo plugins using `_.Plugins.load()` defined in plugins.js.
+2. `_.inited` Promise resolves after page (`$.ready`) and dependencies are ready.
+3. `_.init()` gets all elements with an `mv-app` attribute that matches the `$$` selector (using `selectors` object).
     1. Filters array of `mv-app` elements (use `Mavo.get` to see if there’s another mv-app associated with this element).
     2. Maps each element to a new Mavo instance & return this array.
 

src/mavo.js

@@ -812,22 +812,6 @@ let _ = self.Mavo = $.Class(class Mavo {
 		$.ready().then(() => _.Plugins.load()),
 	]
 
-	// Only naive tests here (no false positives, but false negatives are ok).
-	// polyfill.io will do more proper checking
-	static polyfillsNeeded = {
-		"blissfuljs": Array.from && document.documentElement.closest && self.URL && "searchParams" in URL.prototype,
-		"Intl.~locale.en": self.Intl,
-		"IntersectionObserver": self.IntersectionObserver,
-		"Symbol": self.Symbol,
-		"Element.prototype.remove": Element.prototype.remove,
-		"Element.prototype.before": Element.prototype.before,
-		"Element.prototype.after": Element.prototype.after,
-		"Element.prototype.prepend": Element.prototype.prepend,
-		"Array.prototype.flat": Array.prototype.flat,
-		"Array.prototype.flatMap": Array.prototype.flatMap,
-	}
-	static polyfills = []
-
 	static init (container = document) {
 		let mavos = Array.isArray(arguments[0])? arguments[0] : $$(_.selectors.init, container);
 
@@ -986,7 +970,7 @@ let _ = self.Mavo = $.Class(class Mavo {
 });
 
 // Define symbols
-// These are lazy to give the Symbol polyfill a chance to load if needed
+// TODO: These should not be lazy anymore?
 ["toNode", "isProxy", "route", "parent", "property", "mavo", "groupedBy", "as"].forEach(symbol => {
 	$.lazy(_, symbol, () => Symbol(symbol));
 });
@@ -1018,23 +1002,12 @@ s.output = "[property=output], .mv-output";
 
 }
 
-$.each(_.polyfillsNeeded, (id, supported) => {
-	if (!supported) {
-		_.polyfills.push(id);
-	}
-});
-
 _.ready = _.thenAll(_.dependencies);
 _.inited = _.promise();
 
 // Init mavo. Async to give other scripts a chance to modify stuff.
 await _.defer();
 
-if (_.polyfills.length > 0) {
-	var polyfillURL = "https://cdn.polyfill.io/v2/polyfill.min.js?unknown=polyfill&features=" + _.polyfills.map(a => a + "|gated").join(",");
-	_.dependencies.push($.include(polyfillURL));
-}
-
 await $.ready();
 
 /***********************