feat: custom tsconfig path via ESBK_TSCONFIG_PATH (#14)

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

README.md

@@ -34,6 +34,15 @@ The following properties are used from `tsconfig.json` in the working directory:
 - `jsxFactory`
 - `jsxFragmentFactory`
 
+#### Custom `tsconfig.json` path
+By default, `tsconfig.json` will be detected from the current working directory.
+
+To set a custom path, use the `ESBK_TSCONFIG_PATH` environment variable:
+
+```sh
+ESBK_TSCONFIG_PATH=./path/to/tsconfig.custom.json node -r @esbuild/cjs-loader ./file.js
+```
+
 ### Cache
 Modules transformations are cached in the system cache directory ([`TMPDIR`](https://en.wikipedia.org/wiki/TMPDIR)). Transforms are cached by content hash so duplicate dependencies are not re-transformed.
 

package.json

@@ -33,7 +33,7 @@
 	},
 	"dependencies": {
 		"@esbuild-kit/core-utils": "^2.0.0",
-		"get-tsconfig": "^4.0.5"
+		"get-tsconfig": "^4.1.0"
 	},
 	"devDependencies": {
 		"@pvtnbr/eslint-config": "^0.22.0",

src/index.ts

@@ -8,13 +8,25 @@ import {
 	transformDynamicImport,
 	applySourceMap,
 } from '@esbuild-kit/core-utils';
-import { getTsconfig, createPathsMatcher } from 'get-tsconfig';
+import {
+	getTsconfig,
+	parseTsconfig,
+	createPathsMatcher,
+} from 'get-tsconfig';
 
 const isPathPattern = /^\.{0,2}\//;
 const isTsFilePatten = /\.[cm]?tsx?$/;
 const nodeModulesPath = `${path.sep}node_modules${path.sep}`;
 
-const tsconfig = getTsconfig();
+const tsconfig = (
+	process.env.ESBK_TSCONFIG_PATH
+		? {
+			path: process.env.ESBK_TSCONFIG_PATH,
+			config: parseTsconfig(process.env.ESBK_TSCONFIG_PATH),
+		}
+		: getTsconfig()
+);
+
 const tsconfigRaw = tsconfig?.config;
 const tsconfigPathsMatcher = tsconfig && createPathsMatcher(tsconfig);
 

tests/fixtures/tsconfig/tsconfig-custom/tsconfig.custom-name.json

@@ -0,0 +1,6 @@
+{
+	"extends": "../tsconfig.json",
+	"compilerOptions": {
+		"jsxFactory": "console.error"
+	}
+}

tests/specs/typescript/tsconfig.ts

@@ -10,6 +10,17 @@ export default testSuite(async ({ describe }, node: NodeApis) => {
 			expect(nodeProcess.stdout).toBe('div null hello world\nnull null goodbye world');
 		});
 
+		test('Custom tsconfig.json path', async () => {
+			const nodeProcess = await node.load('./src/tsx.tsx', {
+				cwd: './tsconfig',
+				env: {
+					ESBK_TSCONFIG_PATH: './tsconfig-custom/tsconfig.custom-name.json',
+				},
+			});
+			expect(nodeProcess.stdout).toBe('');
+			expect(nodeProcess.stderr).toBe('div null hello world\nnull null goodbye world');
+		});
+
 		describe('paths', ({ test, describe }) => {
 			test('resolves baseUrl', async () => {
 				const nodeProcess = await node.load('./src/base-url.ts', {

tests/utils/node-with-loader.ts

@@ -7,6 +7,7 @@ type Options = {
 	args: string[];
 	nodePath: string;
 	cwd?: string;
+	env?: NodeJS.ProcessEnv;
 	nodeOptions?: string[];
 };
 
@@ -18,6 +19,7 @@ export const nodeWithLoader = async (
 	{
 		env: {
 			ESBK_DISABLE_CACHE: '1',
+			...options.env,
 		},
 		nodeOptions: [
 			...(options.nodeOptions ?? []),
@@ -44,14 +46,17 @@ export async function createNode(
 			filePath: string,
 			options?: {
 				cwd?: string;
+				env?: typeof process.env;
 				nodeOptions?: string[];
 			},
 		) {
 			return nodeWithLoader(
 				{
+
 					args: [filePath],
 					nodePath: node.path,
 					cwd: path.join(fixturePath, options?.cwd ?? ''),
+					env: options?.env,
 					nodeOptions: options?.nodeOptions,
 				},
 			);