Core: Don't reimplement deprecated but not removed APIs

This will save space and avoid potential divergence from Core.

To minimize risk, this only handles APIs still present in jQuery 4.x.

src/jquery/core.js

@@ -2,9 +2,7 @@ import { jQueryVersionSince } from "../compareVersions.js";
 import { migratePatchAndWarnFunc } from "../main.js";
 import "../disablePatches.js";
 
-var arr = [],
-	slice = arr.slice,
-	class2type = {},
+var class2type = {},
 
 	// Require that the "whitespace run" starts from a non-whitespace
 	// to avoid O(N^2) behavior when the engine would try matching "\s+$" at each space position.
@@ -116,34 +114,7 @@ if ( jQueryVersionSince( "3.3.0" ) ) {
 	// arguments.
 	// jQuery.proxy is deprecated to promote standards (specifically Function#bind)
 	// However, it is not slated for removal any time soon
-	migratePatchAndWarnFunc( jQuery, "proxy",
-		function( fn, context ) {
-			var tmp, args, proxy;
-
-			if ( typeof context === "string" ) {
-				tmp = fn[ context ];
-				context = fn;
-				fn = tmp;
-			}
-
-			// Quick check to determine if target is callable, in the spec
-			// this throws a TypeError, but we will just return undefined.
-			if ( !isFunction( fn ) ) {
-				return undefined;
-			}
-
-			// Simulated bind
-			args = slice.call( arguments, 2 );
-			proxy = function() {
-				return fn.apply( context || this, args.concat( slice.call( arguments ) ) );
-			};
-
-			// Set the guid of unique handler to the same of original handler, so it can be removed
-			proxy.guid = fn.guid = fn.guid || jQuery.guid++;
-
-			return proxy;
-		}, "proxy",
-		"jQuery.proxy() is deprecated"
-	);
+	migratePatchAndWarnFunc( jQuery, "proxy", jQuery.proxy,
+		"proxy", "DEPRECATED: jQuery.proxy()" );
 
 }

src/jquery/event.js

@@ -96,13 +96,9 @@ jQuery.each( ( "blur focus focusin focusout resize scroll click dblclick " +
 function( _i, name ) {
 
 	// Handle event binding
-	migratePatchAndWarnFunc( jQuery.fn, name, function( data, fn ) {
-		return arguments.length > 0 ?
-			this.on( name, null, data, fn ) :
-			this.trigger( name );
-	},
-	"shorthand-deprecated-v3",
-	"jQuery.fn." + name + "() event shorthand is deprecated" );
+	migratePatchAndWarnFunc( jQuery.fn, name, jQuery.fn[ name ], "shorthand-deprecated-v3",
+		"DEPRECATED: jQuery.fn." + name + "() event shorthand" );
+
 } );
 
 // Trigger "ready" event only once, on document ready
@@ -118,20 +114,15 @@ jQuery.event.special.ready = {
 	}
 };
 
-migratePatchAndWarnFunc( jQuery.fn, "bind", function( types, data, fn ) {
-	return this.on( types, null, data, fn );
-}, "pre-on-methods", "jQuery.fn.bind() is deprecated" );
-migratePatchAndWarnFunc( jQuery.fn, "unbind", function( types, fn ) {
-	return this.off( types, null, fn );
-}, "pre-on-methods", "jQuery.fn.unbind() is deprecated" );
-migratePatchAndWarnFunc( jQuery.fn, "delegate", function( selector, types, data, fn ) {
-	return this.on( types, selector, data, fn );
-}, "pre-on-methods", "jQuery.fn.delegate() is deprecated" );
-migratePatchAndWarnFunc( jQuery.fn, "undelegate", function( selector, types, fn ) {
-	return arguments.length === 1 ?
-		this.off( selector, "**" ) :
-		this.off( types, selector || "**", fn );
-}, "pre-on-methods", "jQuery.fn.undelegate() is deprecated" );
+migratePatchAndWarnFunc( jQuery.fn, "bind", jQuery.fn.bind,
+	"pre-on-methods", "jQuery.fn.bind() is deprecated" );
+migratePatchAndWarnFunc( jQuery.fn, "unbind", jQuery.fn.unbind,
+	"pre-on-methods", "jQuery.fn.unbind() is deprecated" );
+migratePatchAndWarnFunc( jQuery.fn, "delegate", jQuery.fn.delegate,
+	"pre-on-methods", "jQuery.fn.delegate() is deprecated" );
+migratePatchAndWarnFunc( jQuery.fn, "undelegate", jQuery.fn.undelegate,
+	"pre-on-methods", "jQuery.fn.undelegate() is deprecated" );
+
 migratePatchAndWarnFunc( jQuery.fn, "hover", function( fnOver, fnOut ) {
 	return this.on( "mouseenter", fnOver ).on( "mouseleave", fnOut || fnOver );
 }, "pre-on-methods", "jQuery.fn.hover() is deprecated" );