update.js

/* Setup autocomplete.js sources */
var sources = [];
var suggestion_template = wp.template( config[ 'tmpl_suggestion' ] );
var sources = [{
	source: algolia.autocomplete.sources.hits( client.initIndex( config[ 'index_name' ] ), {
		hitsPerPage: config[ 'max_suggestions' ],
		attributesToSnippet: [
			'content:10'
		],
		highlightPreTag: '__ais-highlight__',
		highlightPostTag: '__/ais-highlight__'
	} ),
	templates: {
		header: function () {
			return wp.template( 'autocomplete-header' )( {
				label: _.escape( config[ 'label' ] )
			} );
		},
		suggestion: function ( hit ) {
			if ( hit.escaped === true ) {
				return suggestion_template( hit );
			}
			hit.escaped = true;

			for ( var key in hit._highlightResult ) {
				/* We do not deal with arrays. */
				if ( typeof hit._highlightResult[ key ].value !== 'string' ) {
					continue;
				}
				hit._highlightResult[ key ].value = _.escape( hit._highlightResult[ key ].value );
				hit._highlightResult[ key ].value = hit._highlightResult[ key ].value.replace( /__ais-highlight__/g, '<em>' ).replace( /__\/ais-highlight__/g, '</em>' );
			}

			for ( var key in hit._snippetResult ) {
				/* We do not deal with arrays. */
				if ( typeof hit._snippetResult[ key ].value !== 'string' ) {
					continue;
				}

				hit._snippetResult[ key ].value = _.escape( hit._snippetResult[ key ].value );
				hit._snippetResult[ key ].value = hit._snippetResult[ key ].value.replace( /__ais-highlight__/g, '<em>' ).replace( /__\/ais-highlight__/g, '</em>' );
			}

			return suggestion_template( hit );
		}
	}

}];