Build: Add the ability to remove global exposure.

Ref #14016

README.md

@@ -84,6 +84,7 @@ Some example modules that can be excluded are:
- **offset**: The `.offset()`, `.position()`, `.offsetParent()`, `.scrollLeft()`, and `.scrollTop()` methods.
- **wrap**: The `.wrap()`, `.wrapAll()`, `.wrapInner()`, and `.unwrap()` methods.
- **exports/amd**: Exclude the AMD definition.
- **exports/global**: Exclude the attachment of global jQuery variables ($ and jQuery) to the window.
- **core/ready**: Exclude the ready module if you place your scripts at the end of the body. Any ready callbacks bound with `jQuery()` will simply be called immediately. However, `jQuery(document).ready()` will not be a function and `.on("ready", ...)` or similar will not be triggered.
- **deferred**: Exclude jQuery.Deferred. This also removes jQuery.Callbacks. *Note* that modules that depend on jQuery.Deferred(AJAX, effects, core/ready) will not be removed and will still expect jQuery.Deferred to be there. Include your own jQuery.Deferred implementation or exclude those modules as well (`grunt custom:-deferred,-ajax,-effects,-core/ready`).

build/tasks/build.js

@@ -196,6 +196,13 @@ module.exports = function( grunt ) {
			excluded.splice( index, 1 );
		}

		// Replace exports/global with a noop noConflict
		if ( (index = excluded.indexOf( "exports/global" )) > -1 ) {
			config.rawText[ "exports/global" ] = "define(['../core']," +
				"function( jQuery ) {\njQuery.noConflict = function() {};\n});";
			excluded.splice( index, 1 );
		}

		grunt.verbose.writeflags( excluded, "Excluded" );
		grunt.verbose.writeflags( included, "Included" );

src/core.js

@@ -15,12 +15,6 @@ var
	// Use the correct document accordingly with window argument (sandbox)
	document = window.document,

	// Map over jQuery in case of overwrite
	_jQuery = window.jQuery,

	// Map over the $ in case of overwrite
	_$ = window.$,

	version = "@VERSION",

	// Define a local copy of jQuery
@@ -202,18 +196,6 @@ jQuery.extend({

	noop: function() {},

	noConflict: function( deep ) {
		if ( window.$ === jQuery ) {
			window.$ = _$;
		}

		if ( deep && window.jQuery === jQuery ) {
			window.jQuery = _jQuery;
		}

		return jQuery;
	},

	// See test/unit/core.js for details concerning isFunction.
	// Since version 1.3, DOM methods and functions like alert
	// aren't supported. They return false on IE (#2968).

src/exports/global.js

@@ -0,0 +1,29 @@
define([
	"../core"
], function( jQuery ) {

var
	// Map over jQuery in case of overwrite
	_jQuery = window.jQuery,

	// Map over the $ in case of overwrite
	_$ = window.$;

jQuery.noConflict = function( deep ) {
	if ( window.$ === jQuery ) {
		window.$ = _$;
	}

	if ( deep && window.jQuery === jQuery ) {
		window.jQuery = _jQuery;
	}

	return jQuery;
};

// Expose jQuery and $ identifiers, even in
// AMD (#7102#comment:10, https://github.com/jquery/jquery/pull/557)
// and CommonJS for browser emulators (#13566)
window.jQuery = window.$ = jQuery;

});

src/jquery.js

@@ -27,12 +27,10 @@ define([
	"./offset",
	"./dimensions",
	"./deprecated",
	"./exports/amd"
	"./exports/amd",
	"./exports/global"
], function( jQuery ) {

// Expose jQuery and $ identifiers, even in
// AMD (#7102#comment:10, https://github.com/jquery/jquery/pull/557)
// and CommonJS for browser emulators (#13566)
return (window.jQuery = window.$ = jQuery);
return jQuery;

});