Make the global bundle of Prism v2 work the same way as Prism v1 does

Now, the user can include Prism the way they used to (except v2 now uses the Autoloader plugin under the hood, so more languages can be highlighted right out of the box):

```html
<link rel="stylesheet" href="themes/prism.css" />
<script src="prism.js"></script>
```

Besides, they have access to the Prism instance via `globalThis`.

Author: DmitrySharabin

scripts/build.ts

@@ -420,7 +420,12 @@ async function buildJS () {
 					'prism': path.join(SRC_DIR, 'auto-start.ts'),
 				},
 			},
-			outputOptions: defaultOutputOptions,
+			outputOptions: {
+				...defaultOutputOptions,
+				format: 'iife',
+				name: 'Prism',
+				exports: 'named',
+			},
 		},
 	};
 

src/auto-start.ts

@@ -39,6 +39,11 @@ if (typeof document !== 'undefined' && typeof window !== 'undefined') {
 			Prism.highlightAll();
 		}
 	});
+
+	// Make Prism available globally
+	if (typeof globalThis !== 'undefined') {
+		(globalThis as any).Prism = Prism;
+	}
 }
 else {
 	PrismConfig.manual = true;

src/global.ts

@@ -1,10 +1,11 @@
-import { Prism } from './core/prism';
+import globalPrism from './core/prism';
+import type { Prism } from './core/prism';
 
-const globalSymbol = Symbol.for('Prism global');
-
-// eslint-disable-next-line no-undef
-const namespace = globalThis as Partial<Record<typeof globalSymbol, Prism>>;
-const globalPrism = (namespace[globalSymbol] ??= new Prism());
+declare global {
+	interface globalThis {
+		Prism: Prism | undefined;
+	}
+}
 
 /**
  * The global {@link Prism} instance.