Force something in block editor and change post title programatically

block-editor-modal.js

/*!
 * Force post title to include "WordPress"
 *
 * @deps wp-data, wp-dom-ready, wp-element, wp-components
 */

const { data, domReady } = wp;
const { render, Component } = wp.element;
const { Modal, Button, TextControl } = wp.components;

class ModalContainer extends Component {

	constructor( props ) {
		super( props );
		const title = data.select( 'core/editor' ).getEditedPostAttribute( 'title' );
		this.state = {
			valid: this.isValid( title ),
			title: title,
		};
	}

	componentDidMount() {
		const { valid } = this.state;
		data.subscribe( () => {
			// If title doesn't contain "WordPress", force edit.
			const title = data.select( 'core/editor' ).getEditedPostAttribute( 'title' );
			const newValue = this.isValid( title );
			if ( valid !== newValue ) {
				this.setState( {
					valid: newValue,
					title: title,
				} );
			}
		} );
	}

	render() {
		const { valid, title } = this.state;
		if ( ! valid ) {
			return <Modal
				shouldCloseOnClickOutside={ false }
				isDismissible={ false }
				shouldCloseOnEsc={ false }
				title='Title must include "WordPress"'
				onRequestClose={ () => {
					if ( this.isValid( title ) ) {
						this.setState( {
							valid: true,
						} );
					}
				} }>
				<TextControl value={ title } onChange={ ( value ) => {
					this.setState( {
						title: value,
					} );
				} } label={ 'New Title' } />
				{ this.isValid( title ) ? null : (
					<p className="description">Invalid</p>
				) }
				<Button isSecondary disabled={ ! this.isValid( title ) }  onClick={ () => {
					if ( this.isValid( title ) ) {
						this.setState( {
							valid: true,
							title: title,
						}, () => {
							data.dispatch( 'core/editor' ).editPost( {
								title: title,
							} );
						} );
					}
				} }>
					Set Title
				</Button>
			</Modal>;
		} else {
			return null;
		}
	}

	isValid( title) {
		return /WordPress/i.test( title );
	}
}

// Add DOM in editor screen and register as React app.
domReady( () => {
	const wrapper = document.createElement( 'div' );
	document.getElementsByTagName( 'body' )[0].appendChild( wrapper );
	render( <ModalContainer />, wrapper );
} );