DRY out block.tmp stuff

src/generators/dom/Block.js

@@ -104,17 +104,16 @@ export default class Block {
 		if ( this.builders.update.isEmpty() ) {
 			properties.addBlock( `update: ${this.generator.helper( 'noop' )},` );
 		} else {
+			if ( this._tmp ) this.builders.update.addBlockAtStart( `var ${this._tmp};` );
 			properties.addBlock( deindent`
 				update: function ( changed, ${this.params.join( ', ' )} ) {
-					${this.tmp ? `var ${this.tmp};` : ''}
-
 					${this.builders.update}
 				},
 			` );
 		}
 
 		if ( this.builders.destroy.isEmpty() ) {
-			properties.addBlock( `destroy: ${this.generator.helper( 'noop' )},` );
+			properties.addBlock( `destroy: ${this.generator.helper( 'noop' )}` );
 		} else {
 			properties.addBlock( deindent`
 				destroy: function ( detach ) {
@@ -133,4 +132,9 @@ export default class Block {
 			}
 		`;
 	}
+
+	tmp () {
+		if ( !this._tmp ) this._tmp = this.getUniqueName( 'tmp' );
+		return this._tmp;
+	}
 }

src/generators/dom/visitors/MustacheTag.js

@@ -8,11 +8,9 @@ export default function visitMustacheTag ( generator, block, state, node ) {
 	block.builders.create.addLine( `var last_${name} = ${snippet};` );
 	block.addElement( name, `${generator.helper( 'createText' )}( last_${name} )`, state.parentNode, true );
 
-	if ( !block.tmp ) block.tmp = block.getUniqueName( 'tmp' );
-
 	block.builders.update.addBlock( deindent`
-		if ( ( ${block.tmp} = ${snippet} ) !== last_${name} ) {
-			${name}.data = last_${name} = ${block.tmp};
+		if ( ( ${block.tmp()} = ${snippet} ) !== last_${name} ) {
+			${name}.data = last_${name} = ${block.tmp()};
 		}
 	` );
 }

src/generators/dom/visitors/RawMustacheTag.js

@@ -25,11 +25,9 @@ export default function visitRawMustacheTag ( generator, block, state, node ) {
 		block.builders.create.addLine( mountStatement );
 	}
 
-	if ( !block.tmp ) block.tmp = block.getUniqueName( 'tmp' );
-
 	block.builders.update.addBlock( deindent`
-		if ( ( ${block.tmp} = ${snippet} ) !== last_${name} ) {
-			last_${name} = ${block.tmp};
+		if ( ( ${block.tmp()} = ${snippet} ) !== last_${name} ) {
+			last_${name} = ${block.tmp()};
 			${detachStatement}
 			${mountStatement}
 		}

src/generators/dom/visitors/attributes/addElementAttributes.js

@@ -106,11 +106,9 @@ export default function addElementAttributes ( generator, block, node, local ) {
 
 					local.create.addLine( updater );
 
-					if ( !block.tmp ) block.tmp = block.getUniqueName( 'tmp' );
-
 					local.update.addBlock( deindent`
-						if ( ( ${block.tmp} = ${snippet} ) !== ${last} ) {
-							${last} = ${block.tmp};
+						if ( ( ${block.tmp()} = ${snippet} ) !== ${last} ) {
+							${last} = ${block.tmp()};
 							${updater}
 						}
 					` );