Minor refactoring (#272)

* return early
* use a ternary
* be explicit when calling function
* use array includes

src/index.ts

@@ -55,19 +55,22 @@ function detective(src, options: detective.Options = { url: false }) {
     if (file) references.push(file);
   });
 
-  if (options.url) {
-    root.walkDecls((decl) => {
-      const { nodes } = parseValue(decl.value);
-      const files = nodes.filter(isUrlNode).map(getValueOrUrl);
-      if (files) {
-        for (const file of files) {
-          debug('found %s of %s', 'url() with import', file);
-        }
+  if (!options.url) return references;
+
+  root.walkDecls((decl) => {
+    const { nodes } = parseValue(decl.value);
+    const files = nodes
+      .filter((node) => isUrlNode(node))
+      .map((node) => getValueOrUrl(node));
 
-        references = references.concat(files);
+    if (files) {
+      for (const file of files) {
+        debug('found %s of %s', 'url() with import', file);
       }
-    });
-  }
+
+      references = references.concat(files);
+    }
+  });
 
   return references;
 }
@@ -77,14 +80,8 @@ function parseValue(value: string) {
 }
 
 function getValueOrUrl(node: ChildNode) {
-  let ret;
-  if (isUrlNode(node)) {
-    // ['file']
-    const innerNode = node.nodes[0];
-    ret = getValue(innerNode);
-  } else {
-    ret = getValue(node);
-  }
+  // ['file']
+  const ret = isUrlNode(node) ? getValue(node.nodes[0]) : getValue(node);
 
   // is-url sometimes gets data: URLs wrong
   return !isUrl(ret) && !ret.startsWith('data:') && ret;
@@ -95,22 +92,14 @@ function getValue(node: ChildNode) {
     throw new Error('Unexpectedly found a node without a value');
   }
 
-  if (node.type === 'quoted') {
-    return node.contents;
-  }
-
-  return node.value;
+  return node.type === 'quoted' ? node.contents : node.value;
 }
 
 function isNodeWithValue(
   node: ChildNode,
 ): node is Word | Numeric | Operator | Punctuation | Quoted {
-  return (
-    node.type === 'word' ||
-    node.type === 'numeric' ||
-    node.type === 'operator' ||
-    node.type === 'punctuation' ||
-    node.type === 'quoted'
+  return ['word', 'numeric', 'operator', 'punctuation', 'quoted'].includes(
+    node.type,
   );
 }