Throw if a language config bundle cannot be found

Sources/SwiftTreeSitter/LanguageConfiguration.swift

@@ -13,6 +13,11 @@ public struct LanguageData: Sendable {
 	}
 }
 
+enum LanguageConfigurationError: Error {
+	case queryDirectoryNotFound
+	case queryDirectoryNotReadable(URL)
+}
+
 /// A structure that holds a language parser, name, and its assoicated queries.
 public struct LanguageConfiguration: Sendable {
 	public let language: Language
@@ -60,8 +65,17 @@ extension LanguageConfiguration {
 	}
 
 	public init(_ language: Language, name: String, bundleName: String) throws {
-		let queriesURL = Self.bundleQueriesDirectoryURL(for: bundleName)
-		let queries = try queriesURL.flatMap { try Query.queries(for: language, in: $0) } ?? [:]
+		guard let queriesURL = Self.bundleQueriesDirectoryURL(for: bundleName) else {
+			throw LanguageConfigurationError.queryDirectoryNotFound
+		}
+
+		let path = queriesURL.standardizedFileURL.path
+
+		if FileManager.default.isReadableFile(atPath: path) == false {
+			throw LanguageConfigurationError.queryDirectoryNotReadable(queriesURL)
+		}
+
+		let queries = try Query.queries(for: language, in: queriesURL)
 
 		self.init(language, name: name, queries: queries)
 	}

Tests/SwiftTreeSitterTests/LanguageConfigurationTests.swift

@@ -0,0 +1,12 @@
+import XCTest
+
+import SwiftTreeSitter
+import TestTreeSitterSwift
+
+final class LanguageConfigurationTests: XCTestCase {
+	func testCreateLanguageWithIncorrectBundleName() throws {
+		let language = Language(language: tree_sitter_swift())
+
+		XCTAssertThrowsError(try LanguageConfiguration(language, name: "Swift", bundleName: "abc"))
+	}
+}