cli: remove support for implicit module extensions + allow .?ts

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/cli/config/nodeTransformHooks.mjs

@@ -27,7 +27,7 @@ import { existsSync } from 'fs';
 const DEFAULT_MODULE_FORMAT = 'commonjs';
 
 // Source file extensions to look for when using bundle resolution strategy
-const EXTS = ['.ts', '.js', '.mts', '.cts', '.mjs', '.cjs'];
+const SRC_EXTS = ['.ts', '.js'];
 const TS_EXTS = ['.ts', '.mts', '.cts'];
 const moduleTypeTable = {
   '.mjs': 'module',
@@ -177,7 +177,7 @@ async function findPackageJSON(startPath) {
 
 /** @type {import('module').ResolveHook} */
 async function resolveWithoutExt(specifier, context, nextResolve) {
-  for (const tryExt of EXTS) {
+  for (const tryExt of SRC_EXTS) {
     try {
       const resolved = await nextResolve(specifier + tryExt, {
         ...context,

packages/cli/config/tsconfig.json

@@ -1,5 +1,6 @@
 {
   "compilerOptions": {
+    "allowImportingTsExtensions": true,
     "allowJs": true,
     "declaration": true,
     "declarationMap": false,