Fix rollup warning when importing Handlebars as ESM

Closes #1696

.github/workflows/ci.yml

@@ -56,6 +56,7 @@ jobs:
         # https://github.com/webpack/webpack/issues/14532
         if: ${{ matrix.node-version != '17' }}
         run: |
+          cd ./tests/integration/rollup-test && ./test.sh && cd -
           cd ./tests/integration/webpack-babel-test && ./test.sh && cd -
           cd ./tests/integration/webpack-test && ./test.sh && cd -
 

lib/handlebars/internal/proto-access.js

@@ -1,5 +1,5 @@
 import { createNewLookupObject } from './create-new-lookup-object';
-import * as logger from '../logger';
+import logger from '../logger';
 
 const loggedProperties = Object.create(null);
 

tests/integration/rollup-test/.eslintrc.js

@@ -0,0 +1,11 @@
+module.exports = {
+  root: true,
+  extends: ['eslint:recommended', 'prettier'],
+  env: {
+    browser: true
+  },
+  parserOptions: {
+    sourceType: 'module',
+    ecmaVersion: 6
+  }
+};

tests/integration/rollup-test/.gitignore

@@ -0,0 +1,3 @@
+node_modules
+dist
+package-lock.json

tests/integration/rollup-test/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "rollup-test",
+  "description": "Various tests with Handlebars and rollup",
+  "version": "1.0.0",
+  "scripts": {
+    "build": "rollup --config rollup.config.js --failAfterWarnings"
+  },
+  "private": true,
+  "devDependencies": {
+    "@rollup/plugin-node-resolve": "^13.1.1",
+    "handlebars": "file:../../..",
+    "rollup": "^2.61.1"
+  }
+}

tests/integration/rollup-test/rollup.config.js

@@ -0,0 +1,10 @@
+import { nodeResolve } from '@rollup/plugin-node-resolve';
+
+export default {
+  input: 'src/index.js',
+  output: {
+    file: 'dist/bundle.js',
+    format: 'es'
+  },
+  plugins: [nodeResolve()]
+};

tests/integration/rollup-test/src/index.js

@@ -0,0 +1,8 @@
+import Handlebars from 'handlebars/lib/handlebars';
+
+const template = Handlebars.compile('Author: {{author}}');
+const result = template({ author: 'Yehuda' });
+
+if (result !== 'Author: Yehuda') {
+  throw Error('Assertion failed');
+}

tests/integration/rollup-test/test.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+set -e
+
+# Cleanup: package-lock and "npm ci" is not working with local dependencies
+rm dist package-lock.json -rf
+npm install
+npm run build
+
+node dist/bundle.js
+echo "Success"