fix(paths): handle ../ in relative path check (#18)

Co-authored-by: Hiroki Osame <hiroki.osame@gmail.com>

src/paths/index.ts

@@ -24,7 +24,7 @@ function parsePaths(
 					`Substitution '${substitution}' in pattern '${pattern}' can have at most one '*' character.`,
 				);
 
-				if (!substitution.startsWith('./') && !baseUrl) {
+				if (!baseUrl && !isRelativePathPattern.test(substitution)) {
 					throw new Error('Non-relative paths are not allowed when \'baseUrl\' is not set. Did you forget a leading \'./\'?');
 				}
 

tests/specs/paths.spec.ts

@@ -165,6 +165,29 @@ export default testSuite(({ describe }) => {
 			]);
 		});
 
+		// #17
+		test('exact match with parent path', async () => {
+			const fixture = await createFixture({
+				'tsconfig.json': tsconfigJson({
+					compilerOptions: {
+						paths: {
+							exactMatch: ['../src'],
+						},
+					},
+				}),
+			});
+
+			const tsconfig = getTsconfig(fixture.path);
+			expect(tsconfig).not.toBeNull();
+
+			const matcher = createPathsMatcher(tsconfig!)!;
+
+			expect(matcher).not.toBeNull();
+			expect(matcher('exactMatch')).toStrictEqual([
+				path.join(fixture.path, '../src'),
+			]);
+		});
+
 		test('exact match with wildcard', async () => {
 			const fixture = await createFixture({
 				'tsconfig.json': tsconfigJson({