feat(cli): add --tsconfig flag to accept custom tsconfig path (#652)

* feat: expose tsconfig option

* write a test

* oops, remove the only function

* no need for a snapshot

Co-authored-by: EGOIST <hi@egoist.sh>

src/cli-main.ts

@@ -79,6 +79,7 @@ export async function main(options: Options = {}) {
       default: 'node',
     })
     .option('--loader <ext=loader>', 'Specify the loader for a file extension')
+    .option('--tsconfig <filename>', 'Use a custom tsconfig')
     .option('--config <filename>', 'Use a custom config file')
     .option('--no-config', 'Disable config file')
     .option('--shims', 'Enable cjs and esm shims')

test/index.test.ts

@@ -439,6 +439,21 @@ test('onSuccess', async () => {
   expect(logs.includes("world")).toEqual(true)
 })
 
+test('custom tsconfig', async () => {
+  await run(
+    getTestName(),
+    {
+      'input.ts': `export const foo = 'foo'`,
+      'tsconfig.build.json': `{
+      "compilerOptions": {
+        "baseUrl":"."
+      }
+    }`,
+    },
+    { flags: ['--tsconfig', 'tsconfig.build.json'] }
+  )
+})
+
 test('support baseUrl and paths in tsconfig.json', async () => {
   const { getFileContent } = await run(getTestName(), {
     'input.ts': `export * from '@/foo'`,