feat(register): respect conditions from Node.js (#955)

* feat(register): respect conditions from Node.js

* Update readme

Author: Brooooooklyn

README.md

@@ -17,7 +17,7 @@ Run TypeScript with node, without compilation or typechecking:
 ```bash
 npm i -D @swc-node/register
 node -r @swc-node/register script.ts
-node --import @swc-node/register/esm-register script.ts # for esm project with node>=20.6
+node --import @swc-node/register/esm-register --enable-source-maps script.ts # for esm project with node>=20.6
 node --loader @swc-node/register/esm script.ts # for esm project with node<=20.5, deprecated
 ```
 

package.json

@@ -31,7 +31,7 @@
     "lint": "oxlint .",
     "test": "ava",
     "test:jest": "jest --config jest.config.js",
-    "test:module": "cross-env SWC_NODE_PROJECT=packages/integrate-module/tsconfig.json node --import=@swc-node/register/esm-register packages/integrate-module/src/index.ts",
+    "test:module": "cross-env SWC_NODE_PROJECT=packages/integrate-module/tsconfig.json node --enable-source-maps --conditions=dev --import=@swc-node/register/esm-register packages/integrate-module/src/index.ts",
     "version": "pnpm install && git add .",
     "postinstall": "husky"
   },

packages/conditions/dev.js

@@ -0,0 +1 @@
+export const name = 'from-dev'

packages/conditions/import.js

@@ -0,0 +1 @@
+export const name = 'from-import'

packages/conditions/package.json

@@ -0,0 +1,12 @@
+{
+  "type": "module",
+  "name": "@swc-node/test-conditions",
+  "private": true,
+  "types": "./types.d.ts",
+  "exports": {
+    ".": {
+      "dev": "./dev.js",
+      "import": "./index.js"
+    }
+  }
+}

packages/conditions/types.d.ts

@@ -0,0 +1 @@
+export const name: string

packages/integrate-module/package.json

@@ -11,6 +11,7 @@
     "@napi-rs/simple-git": "^0.1.22",
     "@swc/core": "^1.13.3",
     "@swc-node/register": "workspace:*",
+    "@swc-node/test-conditions": "workspace:*",
     "@types/react": "^19.1.10",
     "@types/react-dom": "^19.1.7",
     "esmock": "^2.7.1",

packages/integrate-module/src/index.ts

@@ -4,6 +4,7 @@ import test from 'node:test'
 
 import { RepositoryState } from '@napi-rs/simple-git'
 import { bar as subBar } from '@subdirectory/bar.mjs'
+import { name } from '@swc-node/test-conditions'
 import esmock from 'esmock'
 import { supportedExtensions } from 'file-type'
 import { renderToString } from 'react-dom/server'
@@ -97,3 +98,7 @@ await test('postgres should work', async () => {
     host: 'postgres://localhost',
   })
 })
+
+await test('resolve conditions', () => {
+  assert.equal(name, 'from-dev')
+})

packages/register/esm.mts

@@ -11,7 +11,7 @@ import { extname, isAbsolute, join } from 'node:path'
 import { fileURLToPath, URL, pathToFileURL } from 'node:url'
 
 import debugFactory from 'debug'
-import { EnforceExtension, ResolverFactory } from 'oxc-resolver'
+import { EnforceExtension, ResolverFactory, type NapiResolveOptions } from 'oxc-resolver'
 import ts from 'typescript'
 
 // @ts-expect-error
@@ -35,22 +35,6 @@ const TSCONFIG_PATH = (function () {
   return pathFromEnv
 })()
 
-const resolver = new ResolverFactory({
-  tsconfig: {
-    configFile: TSCONFIG_PATH,
-    references: 'auto',
-  },
-  conditionNames: ['node', 'import'],
-  enforceExtension: EnforceExtension.Auto,
-  extensions: ['.js', '.mjs', '.cjs', '.ts', '.tsx', '.mts', '.cts', '.json', '.wasm', '.node'],
-  extensionAlias: {
-    '.js': ['.ts', '.tsx', '.js'],
-    '.mjs': ['.mts', '.mjs'],
-    '.cjs': ['.cts', '.cjs'],
-  },
-  moduleType: true,
-})
-
 async function getModuleType(path: string): Promise<'module' | 'commonjs' | undefined> {
   const pkgJsonReadContent = await readPackageJSON(path)
   return pkgJsonReadContent?.type
@@ -152,9 +136,37 @@ const EXTENSION_MODULE_MAP = {
   '.node': 'commonjs',
 } as const
 
+let conditions: string[] | undefined = undefined
+
+const resolverOptions: NapiResolveOptions = {
+  tsconfig: {
+    configFile: TSCONFIG_PATH,
+    references: 'auto',
+  },
+  conditionNames: ['node', 'import'],
+  enforceExtension: EnforceExtension.Auto,
+  extensions: ['.js', '.mjs', '.cjs', '.ts', '.tsx', '.mts', '.cts', '.json', '.wasm', '.node'],
+  extensionAlias: {
+    '.js': ['.ts', '.tsx', '.js'],
+    '.mjs': ['.mts', '.mjs'],
+    '.cjs': ['.cts', '.cjs'],
+  },
+  moduleType: true,
+}
+
+let resolver = new ResolverFactory(resolverOptions)
+
 export const resolve: ResolveHook = async (specifier, context, nextResolve) => {
   debug('resolve', specifier, JSON.stringify(context))
 
+  if (!conditions) {
+    conditions = context.conditions
+    resolver = resolver.cloneWithOptions({
+      ...resolverOptions,
+      conditionNames: conditions,
+    })
+  }
+
   if (specifier.startsWith('node:') || specifier.startsWith('nodejs:')) {
     debug('skip resolve: internal format', specifier)