refactor: Use ES modules for internal runtime code (#17648)

This PR refactors all internal js files (except core) to be written as
ES modules.
`__bootstrap`has been mostly replaced with static imports in form in
`internal:[path to file from repo root]`.
To specify if files are ESM, an `esm` method has been added to
`Extension`, similar to the `js` method.
A new ModuleLoader called `InternalModuleLoader` has been added to
enable the loading of internal specifiers, which is used in all
situations except when a snapshot is only loaded, and not a new one is
created from it.

---------

Co-authored-by: Bartek Iwańczuk <biwanczuk@gmail.com>

1 files changed, 7 insertions, 13 deletions

diff --git a/ext/url/internal.d.ts b/ext/url/internal.d.ts
index 7065c432f..b8a2a000a 100644
--- a/ext/url/internal.d.ts
+++ b/ext/url/internal.d.ts
@@ -1,20 +1,14 @@
 // Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
 
-// deno-lint-ignore-file no-var
-
 /// <reference no-default-lib="true" />
 /// <reference lib="esnext" />
 
-declare namespace globalThis {
-  declare namespace __bootstrap {
-    declare var url: {
-      URL: typeof URL;
-      URLSearchParams: typeof URLSearchParams;
-      parseUrlEncoded(bytes: Uint8Array): [string, string][];
-    };
+declare module "internal:ext/url/00_url.js" {
+  const URL: typeof URL;
+  const URLSearchParams: typeof URLSearchParams;
+  function parseUrlEncoded(bytes: Uint8Array): [string, string][];
+}
 
-    declare var urlPattern: {
-      URLPattern: typeof URLPattern;
-    };
-  }
+declare module "internal:ext/url/01_urlpattern.js" {
+  const URLPattern: typeof URLPattern;
 }