format function parameters

src/generators/dom/index.js

@@ -71,7 +71,7 @@ class DomGenerator extends Generator {
 			properties.addBlock( `update: ${this.helper( 'noop' )},` );
 		} else {
 			properties.addBlock( deindent`
-				update: function ( changed, ${fragment.params} ) {
+				update: function ( changed, ${fragment.params.join( ', ' )} ) {
 					var __tmp;
 
 					${fragment.builders.update}
@@ -90,7 +90,7 @@ class DomGenerator extends Generator {
 		}
 
 		this.renderers.push( deindent`
-			function ${fragment.name} ( ${fragment.params}, component${fragment.key ? `, key` : ''} ) {
+			function ${fragment.name} ( ${fragment.params.join( ', ' )}, component${fragment.key ? `, key` : ''} ) {
 				${fragment.builders.init}
 
 				return {

src/generators/dom/visitors/Component.js

@@ -62,7 +62,7 @@ export default {
 		// Component has children, put them in a separate {{yield}} block
 		if ( hasChildren ) {
 			const yieldName = generator.getUniqueName( `render${name}YieldFragment` );
-			const { params } = generator.current;
+			const params = generator.current.params.join( ', ' );
 
 			generator.generateBlock( node, yieldName );
 

src/generators/dom/visitors/IfBlock.js

@@ -32,7 +32,7 @@ function getConditionsAndBlocks ( generator, node, _name, i = 0 ) {
 
 export default {
 	enter ( generator, node ) {
-		const { params } = generator.current;
+		const params = generator.current.params.join( ', ' );
 		const name = generator.getUniqueName( `ifBlock` );
 		const getBlock = generator.getUniqueName( `getBlock` );
 		const currentBlock = generator.getUniqueName( `currentBlock` );