Promises in forEach loop

artists.js

// Create any artists that are not in the DB and return complete array of all artists 
export function createArtists(artists) {

	var updatedArtists = [];
	return new Promise( function( resolve, reject ) {

		artists.forEach( artist => {
			if (! artist.id) {

				// If the artist has no id - create it
				createArtist( artist.name, artist.slug ).then( created => {

					//Push to array
					updatedArtists.push({
						id: created.id,
						name: created.name,
						slug: created.slug
					});

				});

			} else {

				// If the artists does have id, push to array 
				updatedArtists.push({
					id: artist.id,
					name: artist.name,
					slug: artist.slug
				});
				
			}
		});

		resolve( updatedArtists, console.log('create updatedArtists', updatedArtists) );

	});

}

// WP REST API / Backbone
function createArtist( name, slug ) {
	return new Promise( function( resolve, reject ) {
		var created = '';
		var artist = new wp.api.models.Itl_artists( {
			name: name,
			slug: slug
		} );
		created = artist.save();
		resolve( created );
	});
		
};

index.js

// Parse the data
	parseData() {

		// Get current artists
		getCurrentArtists()

			// Set currentArtists as this.state.currentArtists
			.then( currentArtists => this.setCurrentArtistsState( currentArtists )

				// Parse Artists from Table Data
				.then( getNewArtists( this.state.tableData )

					// Set newArtists as this.state.newArtists
					.then( newArtists => this.setNewArtistsState( newArtists )

						// Merge the current & new
						.then( newArtists => mergeArtists(this.state.currentArtists, newArtists)

							// Set mergedArtists as this.state.mergedArtists
							.then( mergedArtists => this.setMergedArtistsState( mergedArtists )

								// Now create the new artists and return updated array
								.then( createArtists(this.state.mergedArtists) )

									// Log the resolve of createArtists
									.then( (updatedArtists) => {

										// THIS SHOULD BE THE SAME AS THE RESOLVE IN artists.js
										console.log('then updatedArtists', updatedArtists);
										
									})
							)
						)
					)
				)
			);
	}

Here is the console output

I had thought that by using a promise inside the forEach loop, it would wait for each promise to resolve before resolving the promise inside createArtists, but clearly not.

I've also tried it using map(), a basic for loop, using a counter and only resolving when the count === updatedArtists.length, but no joy.