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node_modules/loader-utils/lib/urlToRequest.js

@@ -1,49 +1,60 @@
-"use strict";
+'use strict';
 
 // we can't use path.win32.isAbsolute because it also matches paths starting with a forward slash
 const matchNativeWin32Path = /^[A-Z]:[/\\]|^\\\\/i;
 
 function urlToRequest(url, root) {
-	const moduleRequestRegex = /^[^?]*~/;
-	let request;
+  // Do not rewrite an empty url
+  if (url === '') {
+    return '';
+  }
 
-	if(matchNativeWin32Path.test(url)) {
-		// absolute windows path, keep it
-		request = url;
-	} else if(root !== undefined && root !== false && /^\//.test(url)) {
-		// if root is set and the url is root-relative
-		switch(typeof root) {
-			// 1. root is a string: root is prefixed to the url
-			case "string":
-				// special case: `~` roots convert to module request
-				if(moduleRequestRegex.test(root)) {
-					request = root.replace(/([^~\/])$/, "$1/") + url.slice(1);
-				} else {
-					request = root + url;
-				}
-				break;
-			// 2. root is `true`: absolute paths are allowed
-			//    *nix only, windows-style absolute paths are always allowed as they doesn't start with a `/`
-			case "boolean":
-				request = url;
-				break;
-			default:
-				throw new Error("Unexpected parameters to loader-utils 'urlToRequest': url = " + url + ", root = " + root + ".");
-		}
-	} else if(/^\.\.?\//.test(url)) {
-		// A relative url stays
-		request = url;
-	} else {
-		// every other url is threaded like a relative url
-		request = "./" + url;
-	}
+  const moduleRequestRegex = /^[^?]*~/;
+  let request;
 
-	// A `~` makes the url an module
-	if(moduleRequestRegex.test(request)) {
-		request = request.replace(moduleRequestRegex, "");
-	}
+  if (matchNativeWin32Path.test(url)) {
+    // absolute windows path, keep it
+    request = url;
+  } else if (root !== undefined && root !== false && /^\//.test(url)) {
+    // if root is set and the url is root-relative
+    switch (typeof root) {
+      // 1. root is a string: root is prefixed to the url
+      case 'string':
+        // special case: `~` roots convert to module request
+        if (moduleRequestRegex.test(root)) {
+          request = root.replace(/([^~/])$/, '$1/') + url.slice(1);
+        } else {
+          request = root + url;
+        }
+        break;
+      // 2. root is `true`: absolute paths are allowed
+      //    *nix only, windows-style absolute paths are always allowed as they doesn't start with a `/`
+      case 'boolean':
+        request = url;
+        break;
+      default:
+        throw new Error(
+          "Unexpected parameters to loader-utils 'urlToRequest': url = " +
+            url +
+            ', root = ' +
+            root +
+            '.'
+        );
+    }
+  } else if (/^\.\.?\//.test(url)) {
+    // A relative url stays
+    request = url;
+  } else {
+    // every other url is threaded like a relative url
+    request = './' + url;
+  }
 
-	return request;
+  // A `~` makes the url an module
+  if (moduleRequestRegex.test(request)) {
+    request = request.replace(moduleRequestRegex, '');
+  }
+
+  return request;
 }
 
 module.exports = urlToRequest;