Fix missing variables for UMD and IIFE builds (#3724)

src/Chunk.ts

@@ -1221,7 +1221,7 @@ export default class Chunk {
 				format !== 'system',
 				format !== 'es' && format !== 'system',
 				interop,
-				format === 'amd'
+				format === 'amd' || format === 'umd' || format === 'iife'
 			),
 			this.imports,
 			usedNames,

test/form/samples/handles-empty-imports-iife/_config.js

@@ -0,0 +1,14 @@
+module.exports = {
+	description: 'handles empty imports when generating IIFE output',
+	expectedWarnings: ['MISSING_NODE_BUILTINS', 'UNRESOLVED_IMPORT'],
+	options: {
+		output: {
+			format: 'iife',
+			globals: {
+				dns: 'dns',
+				util: 'util',
+				fs: 'fs'
+			}
+		}
+	}
+};

test/form/samples/handles-empty-imports-iife/_expected.js

@@ -0,0 +1,7 @@
+(function (dns, util, fs) {
+	'use strict';
+
+	dns.resolve('name');
+	fs.writeFileSync('foo', 'bar');
+
+}(dns, util, fs));

test/form/samples/handles-empty-imports-iife/main.js

@@ -0,0 +1,6 @@
+import { resolve } from 'dns';
+import 'util';
+import { writeFileSync } from 'fs';
+
+resolve('name');
+writeFileSync('foo', 'bar');

test/form/samples/handles-empty-imports-umd/_config.js

@@ -0,0 +1,14 @@
+module.exports = {
+	description: 'handles empty imports when generating IIFE output',
+	expectedWarnings: ['MISSING_NODE_BUILTINS', 'UNRESOLVED_IMPORT'],
+	options: {
+		output: {
+			format: 'umd',
+			globals: {
+				dns: 'dns',
+				util: 'util',
+				fs: 'fs'
+			}
+		}
+	}
+};

test/form/samples/handles-empty-imports-umd/_expected.js

@@ -0,0 +1,10 @@
+(function (global, factory) {
+	typeof exports === 'object' && typeof module !== 'undefined' ? factory(require('dns'), require('util'), require('fs')) :
+	typeof define === 'function' && define.amd ? define(['dns', 'util', 'fs'], factory) :
+	(global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.dns, global.util, global.fs));
+}(this, (function (dns, util, fs) { 'use strict';
+
+	dns.resolve('name');
+	fs.writeFileSync('foo', 'bar');
+
+})));

test/form/samples/handles-empty-imports-umd/main.js

@@ -0,0 +1,6 @@
+import { resolve } from 'dns';
+import 'util';
+import { writeFileSync } from 'fs';
+
+resolve('name');
+writeFileSync('foo', 'bar');