first commit

wp-content/themes/twentytwentyone/assets/js/editor.js

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+/* global setTimeout */
+wp.domReady( function() {
+	// Unregister "Wide" Separator Style.
+	wp.blocks.unregisterBlockStyle( 'core/separator', 'wide' );
+
+	// Add to ".block-editor__typewriter" the "is-dark-theme" class if needed.
+	function twentytwentyoneCopyDarkThemeClass() {
+		var editor,
+			attemptDelay = 25,
+			attempt = 0,
+			maxAttempts = 10;
+
+		if ( ! document.body.classList.contains( 'is-dark-theme' ) ) {
+			return;
+		}
+
+		editor = document.querySelector( '.block-editor__typewriter' );
+		if ( null === editor ) {
+			// Try again.
+			if ( attempt < maxAttempts ) {
+				setTimeout( function() {
+					twentytwentyoneCopyDarkThemeClass();
+				}, attemptDelay );
+
+				// Increment the attempts counter.
+				attempt++;
+
+				// Double the delay, give the server some time to breathe.
+				attemptDelay *= 2;
+			}
+			return;
+		}
+
+		editor.classList.add( 'is-dark-theme' );
+	}
+
+	twentytwentyoneCopyDarkThemeClass();
+} );