remove unused arg

src/compile/nodes/Element.ts

@@ -702,7 +702,7 @@ export default class Element extends Node {
 
 			block.builders.intro.addBlock(deindent`
 				#component.root._aftercreate.push(() => {
-					if (!${name}) ${name} = @wrapTransition(#component, ${this.var}, ${fn}, ${snippet}, true, null);
+					if (!${name}) ${name} = @wrapTransition(#component, ${this.var}, ${fn}, ${snippet}, true);
 					${name}.run(1);
 				});
 			`);
@@ -734,7 +734,7 @@ export default class Element extends Node {
 
 				block.builders.intro.addBlock(deindent`
 					#component.root._aftercreate.push(() => {
-						${introName} = @wrapTransition(#component, ${this.var}, ${fn}, ${snippet}, true, null);
+						${introName} = @wrapTransition(#component, ${this.var}, ${fn}, ${snippet}, true);
 						${introName}.run(1);
 					});
 				`);
@@ -751,7 +751,7 @@ export default class Element extends Node {
 				// TODO hide elements that have outro'd (unless they belong to a still-outroing
 				// group) prior to their removal from the DOM
 				block.builders.outro.addBlock(deindent`
-					${outroName} = @wrapTransition(#component, ${this.var}, ${fn}, ${snippet}, false, null);
+					${outroName} = @wrapTransition(#component, ${this.var}, ${fn}, ${snippet}, false);
 					${outroName}.run(0, () => {
 						${block.outros > 1 ? `if (--#outros === 0) #outrocallback();` : `#outrocallback();`}
 					});