avoid full scan with ignore empty string array (#86)

* fix: avoid full scan with ignore empty string array, fixes #85

* chore: run biome lint/format

* chore: add test missing entry

Author: ghiscoding

src/index.ts

@@ -103,6 +103,9 @@ function processPatterns(
   const ignorePatterns: string[] = [];
 
   for (const pattern of ignore) {
+    if (!pattern) {
+      continue;
+    }
     // don't handle negated patterns here for consistency with fast-glob
     if (!pattern.startsWith('!') || pattern[1] === '(') {
       const newPattern = normalizePattern(pattern, expandDirectories, cwd, properties, true);
@@ -112,6 +115,9 @@ function processPatterns(
 
   const transformed: string[] = [];
   for (const pattern of patterns) {
+    if (!pattern) {
+      continue;
+    }
     if (!pattern.startsWith('!') || pattern[1] === '(') {
       const newPattern = normalizePattern(pattern, expandDirectories, cwd, properties, false);
       matchPatterns.push(newPattern);

test/index.test.ts

@@ -80,6 +80,11 @@ test('ignore option as string', async () => {
   assert.deepEqual(files.sort(), ['a/a.txt']);
 });
 
+test('ignore option with an empty string array', async () => {
+  const files = await glob({ patterns: ['**/a.txt'], ignore: [''], cwd });
+  assert.deepEqual(files.sort(), ['a/a.txt', 'b/a.txt']);
+});
+
 test('caseSensitiveMatch', async () => {
   const files = await glob({ patterns: ['**/A.TXT'], caseSensitiveMatch: false, cwd });
   assert.deepEqual(files.sort(), ['a/a.txt', 'b/a.txt']);