Core: Warn against jQuery.now & jQuery.camelCase

These APIs have been deprecated in jQuery 3.3.

Fixes gh-594
Fixes gh-595
Closes gh-600
Ref gh-599

Author: mgol

src/jquery/core.js

@@ -114,6 +114,14 @@ if ( jQueryVersionSince( "3.3.0" ) ) {
 		"jQuery.isWindow() is deprecated"
 	);
 
+	migratePatchAndWarnFunc( jQuery, "now", Date.now, "now",
+		"jQuery.now() is deprecated; use Date.now()"
+	);
+
+	migratePatchAndWarnFunc( jQuery, "camelCase", jQuery.camelCase, "camelCase",
+		"jQuery.camelCase() is deprecated"
+	);
+
 	// Bind a function to a context, optionally partially applying any
 	// arguments.
 	// jQuery.proxy is deprecated to promote standards (specifically Function#bind)

test/unit/jquery/core.js

@@ -199,6 +199,35 @@ QUnit[ jQueryVersionSince( "3.3.0" ) ? "test" : "skip" ]( "jQuery.isWindow", fun
 	} );
 } );
 
+QUnit[ jQueryVersionSince( "3.3.0" ) ? "test" : "skip" ]( "jQuery.now", function( assert ) {
+	assert.expect( 2 );
+
+	expectWarning( assert, "now", 1, function() {
+		assert.ok( typeof jQuery.now() === "number", "jQuery.now is a function" );
+	} );
+} );
+
+QUnit[ jQueryVersionSince( "3.3.0" ) ? "test" : "skip" ]( "jQuery.camelCase()", function( assert ) {
+
+	var tests = {
+		"foo-bar": "fooBar",
+		"foo-bar-baz": "fooBarBaz",
+		"girl-u-want": "girlUWant",
+		"the-4th-dimension": "the-4thDimension",
+		"-o-tannenbaum": "OTannenbaum",
+		"-moz-illa": "MozIlla",
+		"-ms-take": "msTake"
+	};
+
+	assert.expect( 8 );
+
+	expectWarning( assert, "now", 7, function() {
+		jQuery.each( tests, function( key, val ) {
+			assert.equal( jQuery.camelCase( key ), val, "Converts: " + key + " => " + val );
+		} );
+	} );
+} );
+
 QUnit.test( "jQuery.unique", function( assert ) {
 	assert.expect( 2 );
 

warnings.md

@@ -99,6 +99,18 @@ This is _not_ a warning, but a console log message the plugin shows when it firs
 
 **Solution**: Replace any use of `.size()` with `.length`.
 
+### \[now\] JQMIGRATE: jQuery.now() is deprecated; use Date.now
+
+**Cause:** The `jQuery.now()` method was a simple alias for `Date.now()`, which is now supported in all browsers supported by jQuery 3.0.
+
+**Solution:** Replace any calls to `jQuery.now()` with `Date.now()`.
+
+### \[camelCase\] JQMIGRATE: jQuery.camelCase() is deprecated
+
+**Cause:** The `jQuery.camelCase()` method was a utility to convert dashed strings like `"background-color"` into camel-cased strings like `"backgroundColor"`. This method was never documented and is now deprecated.
+
+**Solution:** Use a custom utility.
+
 ### \[data-camelCase\] JQMIGRATE: jQuery.data() always sets/gets camelCased names
 
 **Cause:** The page is attempting to set or get a jQuery data item using kebab case, e.g. `my-data`, when a `my-data` item has been set directly on the jQuery data object. jQuery 3.0 always exclusively uses camel case, e.g., `myData`, when it accesses data items via the `.data()` API and does not find kebab case data in that object.