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EDIT :: wp-emoji-loader.js

/**
 * @output wp-includes/js/wp-emoji-loader.js
 */

/**
 * Emoji Settings as exported in PHP via _print_emoji_detection_script().
 * @typedef WPEmojiSettings
 * @type {object}
 * @property {?object} source
 * @property {?string} source.concatemoji
 * @property {?string} source.twemoji
 * @property {?string} source.wpemoji
 * @property {?boolean} DOMReady
 * @property {?Function} readyCallback
 */

/**
 * Support tests.
 * @typedef SupportTests
 * @type {object}
 * @property {?boolean} flag
 * @property {?boolean} emoji
 */

/**
 * IIFE to detect emoji support and load Twemoji if needed.
 *
 * @param {Window} window
 * @param {Document} document
 * @param {WPEmojiSettings} settings
 */
( function wpEmojiLoader( window, document, settings ) {
	if ( typeof Promise === 'undefined' ) {
		return;
	}

var sessionStorageKey = 'wpEmojiSettingsSupports';
	var tests = [ 'flag', 'emoji' ];

/**
	 * Checks whether the browser supports offloading to a Worker.
	 *
	 * @since 6.3.0
	 *
	 * @private
	 *
	 * @returns {boolean}
	 */
	function supportsWorkerOffloading() {
		return (
			typeof Worker !== 'undefined' &&
			typeof OffscreenCanvas !== 'undefined' &&
			typeof URL !== 'undefined' &&
			URL.createObjectURL &&
			typeof Blob !== 'undefined'
		);
	}

/**
	 * @typedef SessionSupportTests
	 * @type {object}
	 * @property {number} timestamp
	 * @property {SupportTests} supportTests
	 */

/**
	 * Get support tests from session.
	 *
	 * @since 6.3.0
	 *
	 * @private
	 *
	 * @returns {?SupportTests} Support tests, or null if not set or older than 1 week.
	 */
	function getSessionSupportTests() {
		try {
			/** @type {SessionSupportTests} */
			var item = JSON.parse(
				sessionStorage.getItem( sessionStorageKey )
			);
			if (
				typeof item === 'object' &&
				typeof item.timestamp === 'number' &&
				new Date().valueOf() < item.timestamp + 604800 && // Note: Number is a week in seconds.
				typeof item.supportTests === 'object'
			) {
				return item.supportTests;
			}
		} catch ( e ) {}
		return null;
	}

/**
	 * Persist the supports in session storage.
	 *
	 * @since 6.3.0
	 *
	 * @private
	 *
	 * @param {SupportTests} supportTests Support tests.
	 */
	function setSessionSupportTests( supportTests ) {
		try {
			/** @type {SessionSupportTests} */
			var item = {
				supportTests: supportTests,
				timestamp: new Date().valueOf()
			};

sessionStorage.setItem(
				sessionStorageKey,
				JSON.stringify( item )
			);
		} catch ( e ) {}
	}

/**
	 * Checks if two sets of Emoji characters render the same visually.
	 *
	 * This is used to determine if the browser is rendering an emoji with multiple data points
	 * correctly. set1 is the emoji in the correct form, using a zero-width joiner. set2 is the emoji
	 * in the incorrect form, using a zero-width space. If the two sets render the same, then the browser
	 * does not support the emoji correctly.
	 *
	 * This function may be serialized to run in a Worker. Therefore, it cannot refer to variables from the containing
	 * scope. Everything must be passed by parameters.
	 *
	 * @since 4.9.0
	 *
	 * @private
	 *
	 * @param {CanvasRenderingContext2D} context 2D Context.
	 * @param {string} set1 Set of Emoji to test.
	 * @param {string} set2 Set of Emoji to test.
	 *
	 * @return {boolean} True if the two sets render the same.
	 */
	function emojiSetsRenderIdentically( context, set1, set2 ) {
		// Cleanup from previous test.
		context.clearRect( 0, 0, context.canvas.width, context.canvas.height );
		context.fillText( set1, 0, 0 );
		var rendered1 = new Uint32Array(
			context.getImageData(
				0,
				0,
				context.canvas.width,
				context.canvas.height
			).data
		);

// Cleanup from previous test.
		context.clearRect( 0, 0, context.canvas.width, context.canvas.height );
		context.fillText( set2, 0, 0 );
		var rendered2 = new Uint32Array(
			context.getImageData(
				0,
				0,
				context.canvas.width,
				context.canvas.height
			).data
		);

return rendered1.every( function ( rendered2Data, index ) {
			return rendered2Data === rendered2[ index ];
		} );
	}

/**
	 * Checks if the center point of a single emoji is empty.
	 *
	 * This is used to determine if the browser is rendering an emoji with a single data point
	 * correctly. The center point of an incorrectly rendered emoji will be empty. A correctly
	 * rendered emoji will have a non-zero value at the center point.
	 *
	 * This function may be serialized to run in a Worker. Therefore, it cannot refer to variables from the containing
	 * scope. Everything must be passed by parameters.
	 *
	 * @since 6.8.2
	 *
	 * @private
	 *
	 * @param {CanvasRenderingContext2D} context 2D Context.
	 * @param {string} emoji Emoji to test.
	 *
	 * @return {boolean} True if the center point is empty.
	 */
	function emojiRendersEmptyCenterPoint( context, emoji ) {
		// Cleanup from previous test.
		context.clearRect( 0, 0, context.canvas.width, context.canvas.height );
		context.fillText( emoji, 0, 0 );

// Test if the center point (16, 16) is empty (0,0,0,0).
		var centerPoint = context.getImageData(16, 16, 1, 1);
		for ( var i = 0; i < centerPoint.data.length; i++ ) {
			if ( centerPoint.data[ i ] !== 0 ) {
				// Stop checking the moment it's known not to be empty.
				return false;
			}
		}

return true;
	}

/**
	 * Determines if the browser properly renders Emoji that Twemoji can supplement.
	 *
	 * This function may be serialized to run in a Worker. Therefore, it cannot refer to variables from the containing
	 * scope. Everything must be passed by parameters.
	 *
	 * @since 4.2.0
	 *
	 * @private
	 *
	 * @param {CanvasRenderingContext2D} context 2D Context.
	 * @param {string} type Whether to test for support of "flag" or "emoji".
	 * @param {Function} emojiSetsRenderIdentically Reference to emojiSetsRenderIdentically function, needed due to minification.
	 * @param {Function} emojiRendersEmptyCenterPoint Reference to emojiRendersEmptyCenterPoint function, needed due to minification.
	 *
	 * @return {boolean} True if the browser can render emoji, false if it cannot.
	 */
	function browserSupportsEmoji( context, type, emojiSetsRenderIdentically, emojiRendersEmptyCenterPoint ) {
		var isIdentical;

switch ( type ) {
			case 'flag':
				/*
				 * Test for Transgender flag compatibility. Added in Unicode 13.
				 *
				 * To test for support, we try to render it, and compare the rendering to how it would look if
				 * the browser doesn't render it correctly (white flag emoji + transgender symbol).
				 */
				isIdentical = emojiSetsRenderIdentically(
					context,
					'\uD83C\uDFF3\uFE0F\u200D\u26A7\uFE0F', // as a zero-width joiner sequence
					'\uD83C\uDFF3\uFE0F\u200B\u26A7\uFE0F' // separated by a zero-width space
				);

if ( isIdentical ) {
					return false;
				}

/*
				 * Test for Sark flag compatibility. This is the least supported of the letter locale flags,
				 * so gives us an easy test for full support.
				 *
				 * To test for support, we try to render it, and compare the rendering to how it would look if
				 * the browser doesn't render it correctly ([C] + [Q]).
				 */
				isIdentical = emojiSetsRenderIdentically(
					context,
					'\uD83C\uDDE8\uD83C\uDDF6', // as the sequence of two code points
					'\uD83C\uDDE8\u200B\uD83C\uDDF6' // as the two code points separated by a zero-width space
				);

if ( isIdentical ) {
					return false;
				}

/*
				 * Test for English flag compatibility. England is a country in the United Kingdom, it
				 * does not have a two letter locale code but rather a five letter sub-division code.
				 *
				 * To test for support, we try to render it, and compare the rendering to how it would look if
				 * the browser doesn't render it correctly (black flag emoji + [G] + [B] + [E] + [N] + [G]).
				 */
				isIdentical = emojiSetsRenderIdentically(
					context,
					// as the flag sequence
					'\uD83C\uDFF4\uDB40\uDC67\uDB40\uDC62\uDB40\uDC65\uDB40\uDC6E\uDB40\uDC67\uDB40\uDC7F',
					// with each code point separated by a zero-width space
					'\uD83C\uDFF4\u200B\uDB40\uDC67\u200B\uDB40\uDC62\u200B\uDB40\uDC65\u200B\uDB40\uDC6E\u200B\uDB40\uDC67\u200B\uDB40\uDC7F'
				);

return ! isIdentical;
			case 'emoji':
				/*
				 * Does Emoji 16.0 cause the browser to go splat?
				 *
				 * To test for Emoji 16.0 support, try to render a new emoji: Splatter.
				 *
				 * The splatter emoji is a single code point emoji. Testing for browser support
				 * required testing the center point of the emoji to see if it is empty.
				 *
				 * 0xD83E 0xDEDF (\uD83E\uDEDF) == 🫟 Splatter.
				 *
				 * When updating this test, please ensure that the emoji is either a single code point
				 * or switch to using the emojiSetsRenderIdentically function and testing with a zero-width
				 * joiner vs a zero-width space.
				 */
				var notSupported = emojiRendersEmptyCenterPoint( context, '\uD83E\uDEDF' );
				return ! notSupported;
		}

return false;
	}

/**
	 * Checks emoji support tests.
	 *
	 * This function may be serialized to run in a Worker. Therefore, it cannot refer to variables from the containing
	 * scope. Everything must be passed by parameters.
	 *
	 * @since 6.3.0
	 *
	 * @private
	 *
	 * @param {string[]} tests Tests.
	 * @param {Function} browserSupportsEmoji Reference to browserSupportsEmoji function, needed due to minification.
	 * @param {Function} emojiSetsRenderIdentically Reference to emojiSetsRenderIdentically function, needed due to minification.
	 * @param {Function} emojiRendersEmptyCenterPoint Reference to emojiRendersEmptyCenterPoint function, needed due to minification.
	 *
	 * @return {SupportTests} Support tests.
	 */
	function testEmojiSupports( tests, browserSupportsEmoji, emojiSetsRenderIdentically, emojiRendersEmptyCenterPoint ) {
		var canvas;
		if (
			typeof WorkerGlobalScope !== 'undefined' &&
			self instanceof WorkerGlobalScope
		) {
			canvas = new OffscreenCanvas( 300, 150 ); // Dimensions are default for HTMLCanvasElement.
		} else {
			canvas = document.createElement( 'canvas' );
		}

var context = canvas.getContext( '2d', { willReadFrequently: true } );

/*
		 * Chrome on OS X added native emoji rendering in M41. Unfortunately,
		 * it doesn't work when the font is bolder than 500 weight. So, we
		 * check for bold rendering support to avoid invisible emoji in Chrome.
		 */
		context.textBaseline = 'top';
		context.font = '600 32px Arial';

var supports = {};
		tests.forEach( function ( test ) {
			supports[ test ] = browserSupportsEmoji( context, test, emojiSetsRenderIdentically, emojiRendersEmptyCenterPoint );
		} );
		return supports;
	}

/**
	 * Adds a script to the head of the document.
	 *
	 * @ignore
	 *
	 * @since 4.2.0
	 *
	 * @param {string} src The url where the script is located.
	 *
	 * @return {void}
	 */
	function addScript( src ) {
		var script = document.createElement( 'script' );
		script.src = src;
		script.defer = true;
		document.head.appendChild( script );
	}

settings.supports = {
		everything: true,
		everythingExceptFlag: true
	};

// Create a promise for DOMContentLoaded since the worker logic may finish after the event has fired.
	var domReadyPromise = new Promise( function ( resolve ) {
		document.addEventListener( 'DOMContentLoaded', resolve, {
			once: true
		} );
	} );

// Obtain the emoji support from the browser, asynchronously when possible.
	new Promise( function ( resolve ) {
		var supportTests = getSessionSupportTests();
		if ( supportTests ) {
			resolve( supportTests );
			return;
		}

if ( supportsWorkerOffloading() ) {
			try {
				// Note that the functions are being passed as arguments due to minification.
				var workerScript =
					'postMessage(' +
					testEmojiSupports.toString() +
					'(' +
					[
						JSON.stringify( tests ),
						browserSupportsEmoji.toString(),
						emojiSetsRenderIdentically.toString(),
						emojiRendersEmptyCenterPoint.toString()
					].join( ',' ) +
					'));';
				var blob = new Blob( [ workerScript ], {
					type: 'text/javascript'
				} );
				var worker = new Worker( URL.createObjectURL( blob ), { name: 'wpTestEmojiSupports' } );
				worker.onmessage = function ( event ) {
					supportTests = event.data;
					setSessionSupportTests( supportTests );
					worker.terminate();
					resolve( supportTests );
				};
				return;
			} catch ( e ) {}
		}

supportTests = testEmojiSupports( tests, browserSupportsEmoji, emojiSetsRenderIdentically, emojiRendersEmptyCenterPoint );
		setSessionSupportTests( supportTests );
		resolve( supportTests );
	} )
		// Once the browser emoji support has been obtained from the session, finalize the settings.
		.then( function ( supportTests ) {
			/*
			 * Tests the browser support for flag emojis and other emojis, and adjusts the
			 * support settings accordingly.
			 */
			for ( var test in supportTests ) {
				settings.supports[ test ] = supportTests[ test ];

settings.supports.everything =
					settings.supports.everything && settings.supports[ test ];

if ( 'flag' !== test ) {
					settings.supports.everythingExceptFlag =
						settings.supports.everythingExceptFlag &&
						settings.supports[ test ];
				}
			}

settings.supports.everythingExceptFlag =
				settings.supports.everythingExceptFlag &&
				! settings.supports.flag;

// Sets DOMReady to false and assigns a ready function to settings.
			settings.DOMReady = false;
			settings.readyCallback = function () {
				settings.DOMReady = true;
			};
		} )
		.then( function () {
			return domReadyPromise;
		} )
		.then( function () {
			// When the browser can not render everything we need to load a polyfill.
			if ( ! settings.supports.everything ) {
				settings.readyCallback();

var src = settings.source || {};

if ( src.concatemoji ) {
					addScript( src.concatemoji );
				} else if ( src.wpemoji && src.twemoji ) {
					addScript( src.twemoji );
					addScript( src.wpemoji );
				}
			}
		} );
} )( window, document, window._wpemojiSettings );

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EDIT :: wp-emoji-loader.js