e2e: esm test

test/e2e.sh

@@ -96,8 +96,17 @@ echo Test: cjs
 cd $temp_dir/e2e/cjs
 
 echo Installing
-echo "{}" >package.json
 npm i npm-check-updates@latest --registry $registry_local
 
 echo Running test
 REGISTRY=$registry_local node $temp_dir/e2e/cjs/index.js
+
+# Test: esm
+echo Test: esm
+cd $temp_dir/e2e/esm
+
+echo Installing
+npm i npm-check-updates@latest --registry $registry_local
+
+echo Running test
+REGISTRY=$registry_local node $temp_dir/e2e/esm/index.js

test/e2e/cjs/index.js

@@ -1,5 +1,4 @@
 /** NOTE: This script is copied into a temp directory by the e2e test and dependencies are installed from the local verdaccio registry. */
-
 const ncu = require('npm-check-updates')
 const assert = require('assert')
 

test/e2e/cjs/package.json

@@ -0,0 +1 @@
+{}

test/e2e/esm/index.js

@@ -0,0 +1,28 @@
+/** NOTE: This script is copied into a temp directory by the e2e test and dependencies are installed from the local verdaccio registry. */
+import assert from 'assert'
+import ncu from 'npm-check-updates'
+
+const registry = process.env.REGISTRY || 'http://localhost:4873'
+
+// must exit with error code on unhandledRejection, otherwise script will exit with 0 if an assertion fails in the async block
+process.on('unhandledRejection', (reason, p) => {
+  process.exit(1)
+})
+
+// test
+;(async () => {
+  const upgraded = await ncu.run({
+    // --pre 1 to ensure that an upgrade is always suggested even if npm-check-updates is on a prerelease version
+    pre: true,
+    packageData: JSON.stringify({
+      dependencies: {
+        'npm-check-updates': '1.0.0',
+      },
+    }),
+    registry,
+  })
+
+  console.info(upgraded)
+
+  assert.notStrictEqual(upgraded['npm-check-updates'], '1.0.0', 'npm-check-updates should be upgraded')
+})()

test/e2e/esm/package.json

@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}