fix crawling parent directories

src/utils.ts

@@ -6,6 +6,8 @@ export interface PartialMatcherOptions {
   nocase?: boolean;
 }
 
+const ONLY_PARENT_DIRECTORIES = /^(\/?\.\.)+$/;
+
 // the result of over 4 months of figuring stuff out and a LOT of help
 export function getPartialMatcher(patterns: string[], options?: PartialMatcherOptions): Matcher {
   // you might find this code pattern odd, but apparently it's faster than using `.push()`
@@ -25,6 +27,13 @@ export function getPartialMatcher(patterns: string[], options?: PartialMatcherOp
   return (input: string) => {
     // no need to `splitPattern` as this is indeed not a pattern
     const inputParts = input.split('/');
+    // if we only have patterns like `src/*` but the input is `../..`
+    // normally the parent directory would not get crawled
+    // and as such wrong results would be returned
+    // to avoid this always return true if the input only consists of .. ../.. etc
+    if (inputParts[0] === '..' && ONLY_PARENT_DIRECTORIES.test(input)) {
+      return true;
+    }
     for (let i = 0; i < patterns.length; i++) {
       const patternParts = patternsParts[i];
       const regex = regexes[i];

test/utils/partial-matcher.test.ts

@@ -46,7 +46,12 @@ describe('getPartialMatcher', () => {
 
   test("** doesn't match ..", () => {
     const matcher = getPartialMatcher(['**']);
-    assert.ok(!matcher('..'));
+    assert.ok(!matcher('../hi'));
+  });
+
+  test('always match inputs with only parent directories', () => {
+    const matcher = getPartialMatcher(['**']);
+    assert.ok(matcher('../../..'));
   });
 
   test('for now treats parts with / as **', () => {