From 5501ba08b7d798f9ee04ad3302632ecb30604e25 Mon Sep 17 00:00:00 2001
From: Daniel Kennedy <danwkennedy@github.com>
Date: Wed, 28 Jan 2026 13:25:11 -0500
Subject: [PATCH] `@actions/io`: convert to ESM module

---
 packages/io/__tests__/io.test.ts | 4 ++--
 packages/io/package-lock.json    | 4 ++--
 packages/io/package.json         | 9 ++++++++-
 packages/io/src/io.ts            | 2 +-
 packages/io/tsconfig.json        | 4 +++-
 5 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/packages/io/__tests__/io.test.ts b/packages/io/__tests__/io.test.ts
index 0fcab0d5..39d3a58c 100644
--- a/packages/io/__tests__/io.test.ts
+++ b/packages/io/__tests__/io.test.ts
@@ -2,8 +2,8 @@ import * as child from 'child_process'
 import {promises as fs} from 'fs'
 import * as os from 'os'
 import * as path from 'path'
-import * as io from '../src/io'
-import * as ioUtil from '../src/io-util'
+import * as io from '../src/io.js'
+import * as ioUtil from '../src/io-util.js'
 
 describe('cp', () => {
   beforeAll(async () => {
diff --git a/packages/io/package-lock.json b/packages/io/package-lock.json
index ddd87acf..09b881c6 100644
--- a/packages/io/package-lock.json
+++ b/packages/io/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@actions/io",
-  "version": "2.0.0",
+  "version": "3.0.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@actions/io",
-      "version": "2.0.0",
+      "version": "3.0.0",
       "license": "MIT"
     }
   }
diff --git a/packages/io/package.json b/packages/io/package.json
index f0be1206..b928070f 100644
--- a/packages/io/package.json
+++ b/packages/io/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@actions/io",
-  "version": "2.0.0",
+  "version": "3.0.0",
   "description": "Actions io lib",
   "keywords": [
     "github",
@@ -9,8 +9,15 @@
   ],
   "homepage": "https://github.com/actions/toolkit/tree/main/packages/io",
   "license": "MIT",
+  "type": "module",
   "main": "lib/io.js",
   "types": "lib/io.d.ts",
+  "exports": {
+    ".": {
+      "types": "./lib/io.d.ts",
+      "import": "./lib/io.js"
+    }
+  },
   "directories": {
     "lib": "lib",
     "test": "__tests__"
diff --git a/packages/io/src/io.ts b/packages/io/src/io.ts
index bbd8efd3..3c3bb9fd 100644
--- a/packages/io/src/io.ts
+++ b/packages/io/src/io.ts
@@ -1,6 +1,6 @@
 import {ok} from 'assert'
 import * as path from 'path'
-import * as ioUtil from './io-util'
+import * as ioUtil from './io-util.js'
 
 /**
  * Interface for cp/mv options
diff --git a/packages/io/tsconfig.json b/packages/io/tsconfig.json
index a8b812a6..c440cd7f 100644
--- a/packages/io/tsconfig.json
+++ b/packages/io/tsconfig.json
@@ -3,7 +3,9 @@
   "compilerOptions": {
     "baseUrl": "./",
     "outDir": "./lib",
-    "rootDir": "./src"
+    "rootDir": "./src",
+    "module": "node16",
+    "moduleResolution": "node16"
   },
   "include": [
     "./src"