handle empty attributes

src/generators/extractSelectors.ts

@@ -114,8 +114,8 @@ function selectorAppliesTo(parts: Node[], node: Node, stack: Node[]): boolean {
 
 function classMatches(node: Node, className: string) {
 	const attr = node.attributes.find((attr: Node) => attr.name === 'class');
-	if (!attr) return false;
-	if (isDynamic(attr)) return true;
+	if (!attr || attr.value === true) return false;
+	if (isDynamic(attr.value)) return true;
 
 	const value = attr.value[0].data;
 
@@ -125,7 +125,7 @@ function classMatches(node: Node, className: string) {
 function attributeMatches(node: Node, selector: Node) {
 	const attr = node.attributes.find((attr: Node) => attr.name === selector.name.name);
 	if (!attr) return false;
-	if (isDynamic(attr)) return true;
+	if (attr.value === true || isDynamic(attr.value)) return true;
 
 	const expectedValue = unquote(selector.value.value);
 	const actualValue = attr.value[0].data;
@@ -137,8 +137,8 @@ function attributeMatches(node: Node, selector: Node) {
 	return true;
 }
 
-function isDynamic(attr: Node) {
-	return attr.value.length > 1 || attr.value[0].type !== 'Text';
+function isDynamic(value: Node) {
+	return value.length > 1 || value[0].type !== 'Text';
 }
 
 function unquote(str: string) {

test/css/samples/omit-scoping-attribute-attribute-selector/_config.js

@@ -0,0 +1,3 @@
+export default {
+	cascade: false
+};

test/css/samples/omit-scoping-attribute-attribute-selector/expected.css

@@ -0,0 +1,4 @@
+
+	[data-foo][svelte-2966013849] {
+		color: red;
+	}

test/css/samples/omit-scoping-attribute-attribute-selector/expected.html

@@ -0,0 +1,2 @@
+<div><p svelte-2966013849="" data-foo="true">this is styled</p>
+	<p data-bar="true">this is unstyled</p></div>

test/css/samples/omit-scoping-attribute-attribute-selector/input.html

@@ -0,0 +1,10 @@
+<div>
+	<p data-foo>this is styled</p>
+	<p data-bar>this is unstyled</p>
+</div>
+
+<style>
+	[data-foo] {
+		color: red;
+	}
+</style>