fix: handle relative tsconfig.json paths (#80)

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

src/parse-tsconfig/index.ts

@@ -211,4 +211,4 @@ const _parseTsconfig = (
 export const parseTsconfig = (
 	tsconfigPath: string,
 	cache: Cache<string> = new Map(),
-): TsConfigJsonResolved => _parseTsconfig(tsconfigPath, cache);
+): TsConfigJsonResolved => _parseTsconfig(path.resolve(tsconfigPath), cache);

tests/index.ts

@@ -1,8 +1,47 @@
-import { describe } from 'manten';
+import { describe, test, expect } from 'manten';
+import { createFixture } from 'fs-fixture';
+import { createTsconfigJson, getTscResolution } from './utils.js';
+import { getTsconfig, createPathsMatcher } from '#get-tsconfig';
 
-describe('get-tsconfig', ({ runTestSuite }) => {
+await describe('get-tsconfig', ({ runTestSuite }) => {
 	runTestSuite(import('./specs/get-tsconfig.js'));
 	runTestSuite(import('./specs/parse-tsconfig/index.js'));
 	runTestSuite(import('./specs/create-paths-matcher.js'));
 	runTestSuite(import('./specs/create-files-matcher.js'));
 });
+
+/**
+ * This needs to happen in isolation because it changes process.cwd
+ *
+ * TODO: either: 1) update code to not rely on cwd, or 2) update manten to handle parallel: false
+ */
+test('paths > prefix match > nested directory', async () => {
+	await using fixture = await createFixture({
+		'dir/tsconfig.json': createTsconfigJson({
+			compilerOptions: {
+				paths: {
+					'@/*': ['./*'],
+				},
+			},
+		}),
+	});
+
+	const cwd = process.cwd();
+
+	try {
+		process.chdir(fixture.path);
+
+		const tsconfig = getTsconfig('./dir/tsconfig.json');
+		expect(tsconfig).not.toBeNull();
+
+		const matcher = createPathsMatcher(tsconfig!)!;
+		expect(matcher).not.toBeNull();
+
+		const resolvedAttempts = await getTscResolution('@/file', fixture.getPath('./dir'));
+		expect(matcher('@/file')).toStrictEqual([
+			resolvedAttempts[0].filePath.slice(0, -3),
+		]);
+	} finally {
+		process.chdir(cwd);
+	}
+});

tests/specs/create-paths-matcher.ts

@@ -136,7 +136,7 @@ export default testSuite(({ describe }) => {
 		});
 
 		describe('baseUrl', ({ test }) => {
-			test('baseUrl', async () => {
+			test('absolute path', async () => {
 				await using fixture = await createFixture({
 					'tsconfig.json': createTsconfigJson({
 						compilerOptions: {

tests/specs/parse-tsconfig/parses.spec.ts

@@ -9,7 +9,7 @@ export default testSuite(({ describe }) => {
 			test('non-existent path', async () => {
 				expect(
 					() => parseTsconfig('non-existent-path'),
-				).toThrow('Cannot resolve tsconfig at path: non-existent-path');
+				).toThrow('Cannot resolve tsconfig at path: ');
 			});
 
 			test('empty file', async () => {