fix(core): allow esm extensions not included in snapshot (#18980)

Fixes #18979.

This changes the predicate for allowing `ext:` specifier resolution from
`snapshot_loaded_and_not_snapshotting` to `ext_resolution_allowed` which
is only set to true during the extension module loading phase. Module
loaders as used in core
are now declared as `ExtModuleLoader` rather than `dyn ModuleLoader`.

1 files changed, 5 insertions, 0 deletions

diff --git a/runtime/examples/hello_runtime_bootstrap.js b/runtime/examples/hello_runtime_bootstrap.js
new file mode 100644
index 000000000..759dde939
--- /dev/null
+++ b/runtime/examples/hello_runtime_bootstrap.js
@@ -0,0 +1,5 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+function hello() {
+  console.log("Hello from extension!");
+}
+globalThis.Extension = { hello };