From 860d1f6f5f7ece197e92a822470a093ae7a7a68a Mon Sep 17 00:00:00 2001
From: LongYinan <lynweklm@gmail.com>
Date: Wed, 15 Feb 2023 14:00:02 +0800
Subject: [PATCH] fix(register): enforece module option in register/esm (#694)

---
 packages/register/esm.mts     |  5 ++++-
 packages/register/register.ts | 20 ++++++++++++++------
 2 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/packages/register/esm.mts b/packages/register/esm.mts
index 7897d1539..8c4d26cb7 100644
--- a/packages/register/esm.mts
+++ b/packages/register/esm.mts
@@ -2,6 +2,8 @@ import { promises as fs, constants as FSConstants } from 'fs'
 import { join, parse, isAbsolute } from 'path'
 import { fileURLToPath, pathToFileURL } from 'url'
 
+import ts from 'typescript'
+
 // @ts-expect-error
 import { readDefaultTsConfig } from '../lib/read-default-tsconfig.js'
 // @ts-expect-error
@@ -93,7 +95,8 @@ type LoadFn = (
 export const load: LoadFn = async (url, context, defaultLoad) => {
   const filePath = TRANSFORM_MAP.get(url)
   if (filePath) {
-    const tsconfig = readDefaultTsConfig()
+    const tsconfig: ts.CompilerOptions = readDefaultTsConfig()
+    tsconfig.module = ts.ModuleKind.ESNext
     const code = await compile(await fs.readFile(filePath, 'utf8'), filePath, tsconfig, true)
     return {
       format: context.format,
diff --git a/packages/register/register.ts b/packages/register/register.ts
index 327a8612d..194afa557 100644
--- a/packages/register/register.ts
+++ b/packages/register/register.ts
@@ -1,7 +1,7 @@
 import { platform } from 'os'
 import { resolve } from 'path'
 
-import { transform, transformSync } from '@swc-node/core'
+import { transform, transformSync, Options } from '@swc-node/core'
 import { SourcemapMap, installSourceMapSupport } from '@swc-node/sourcemap-support'
 import { addHook } from 'pirates'
 import * as ts from 'typescript'
@@ -77,12 +77,16 @@ export function compile(
       return code
     })
   } else {
-    const swcRegisterConfig = tsCompilerOptionsToSwcConfig(options, filename)
-    if (process.env.SWCRC === 'true') {
+    let swcRegisterConfig: Options
+    if (process.env.SWCRC) {
       // when SWCRC environment variable is set to true it will use swcrc file
-      swcRegisterConfig.swc = {
-        swcrc: true,
+      swcRegisterConfig = {
+        swc: {
+          swcrc: true,
+        },
       }
+    } else {
+      swcRegisterConfig = tsCompilerOptionsToSwcConfig(options, filename)
     }
     const { code, map } = transformSync(sourcecode, filename, swcRegisterConfig)
     // in case of map is undefined
@@ -93,7 +97,11 @@ export function compile(
   }
 }
 
-export function register(options = readDefaultTsConfig(), hookOpts = {}) {
+export function register(options: Partial<ts.CompilerOptions> = {}, hookOpts = {}) {
+  if (!process.env.SWCRC) {
+    options = readDefaultTsConfig()
+  }
+  options.module = ts.ModuleKind.CommonJS
   installSourceMapSupport()
   return addHook((code, filename) => compile(code, filename, options), {
     exts: DEFAULT_EXTENSIONS,