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>

2 files changed, 7 insertions, 2 deletions

diff --git a/ext/webidl/benches/dict.js b/ext/webidl/benches/dict.js
index 353a630eb..b53326de9 100644
--- a/ext/webidl/benches/dict.js
+++ b/ext/webidl/benches/dict.js
@@ -2,7 +2,10 @@
 
 // deno-lint-ignore-file
 
-const { createDictionaryConverter, converters } = globalThis.__bootstrap.webidl;
+import {
+  converters,
+  createDictionaryConverter,
+} from "internal:ext/webidl/00_webidl.js";
 
 const TextDecodeOptions = createDictionaryConverter(
   "TextDecodeOptions",
@@ -14,6 +17,7 @@ const TextDecodeOptions = createDictionaryConverter(
     },
   ],
 );
+globalThis.TextDecodeOptions = TextDecodeOptions;
 
 // Sanity check
 {
@@ -33,3 +37,4 @@ function handwrittenConverter(V) {
   }
   return defaultValue;
 }
+globalThis.handwrittenConverter = handwrittenConverter;
diff --git a/ext/webidl/benches/dict.rs b/ext/webidl/benches/dict.rs
index e7df8af62..1400a00ed 100644
--- a/ext/webidl/benches/dict.rs
+++ b/ext/webidl/benches/dict.rs
@@ -11,7 +11,7 @@ fn setup() -> Vec<Extension> {
   vec![
     deno_webidl::init(),
     Extension::builder("deno_webidl_bench")
-      .js(vec![("setup", include_str!("dict.js"))])
+      .esm(vec![("internal:setup", include_str!("dict.js"))])
       .build(),
   ]
 }