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perf(fmt): optimize root gitignore matching #166

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Merged
chenjiahan merged 1 commit into from
Aug 4, 2026
Merged

perf(fmt): optimize root gitignore matching #166

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9 changes: 9 additions & 0 deletions packages/rstack/src/fmt/discoverPaths.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -164,6 +164,15 @@ class GitIgnoreMatcher {
}

#matches(relativePath: string, isDirectory: boolean): boolean {
// Most repositories only use a root `.gitignore`. Avoid checking every path
// segment when no nested matcher can override its result.
const rootMatcher = this.#matchers.size === 1 ? this.#matchers.get(this.#rootPath) : undefined;
if (rootMatcher) {
// `ignore` expects POSIX separators and uses a trailing slash to distinguish directories.
const pathFromMatcher = toPosixPath(relativePath);
return rootMatcher.test(isDirectory ? `${pathFromMatcher}/` : pathFromMatcher).ignored;
}

const segments = relativePath.split(path.sep);
let directoryPath = this.#rootPath;
let pathFromMatcher = segments.join('/');
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