fix(utils/filename): handle files beginning with a period or without …

…ext (#185)

src/utils.ts

@@ -5,6 +5,8 @@ const pathSeparators = new Set(["/", "\\", undefined]);
 
 const normalizedAliasSymbol = Symbol.for("pathe:normalizedAlias");
 
+const SLASH_RE = /[/\\]/;
+
 /**
  * Normalises alias mappings, ensuring that more specific aliases are resolved before less specific ones.
  * This function also ensures that aliases do not resolve to themselves cyclically.
@@ -72,16 +74,26 @@ export function resolveAlias(path: string, aliases: Record<string, string>) {
   return _path;
 }
 
-const FILENAME_RE = /(^|[/\\])([^/\\]+?)(?=(\.[^.]+)?$)/;
-
 /**
  * Extracts the filename from a given path, excluding any directory paths and the file extension.
  *
  * @param path - The full path of the file from which to extract the filename.
  * @returns the filename without the extension, or `undefined` if the filename cannot be extracted.
  */
 export function filename(path: string) {
-  return path.match(FILENAME_RE)?.[2];
+  const base = path.split(SLASH_RE).pop();
+
+  if (!base) {
+    return undefined;
+  }
+
+  const separatorIndex = base.lastIndexOf(".");
+
+  if (separatorIndex <= 0) {
+    return base;
+  }
+
+  return base.slice(0, separatorIndex);
 }
 
 // --- internals ---

test/utils.spec.ts

@@ -64,12 +64,24 @@ describe("filename", () => {
     "test.html": "test",
     "/temp/myfile.html": "myfile",
     "./myfile.html": "myfile",
+    "/Users/john.doe/foo/myFile.js": "myFile",
+    "/Users/john.doe/foo/myFile": "myFile",
+    "./.hidden/myFile.ts": "myFile",
+    "./.hidden/myFile": "myFile",
+    "/temp/.gitignore": ".gitignore",
+    "./foo.bar.baz.js": "foo.bar.baz",
 
     // Windows
     "C:\\temp\\": undefined,
     "C:\\temp\\myfile.html": "myfile",
     "\\temp\\myfile.html": "myfile",
     ".\\myfile.html": "myfile",
+    ".\\john.doe\\myfile.js": "myfile",
+    ".\\john.doe\\myfile": "myfile",
+    ".\\.hidden\\myfile.js": "myfile",
+    ".\\.hidden\\myfile": "myfile",
+    "C:\\temp\\.gitignore": ".gitignore",
+    "C:\\temp\\foo.bar.baz.js": "foo.bar.baz",
   };
   for (const file in files) {
     it(file, () => {