1 files changed, 107 insertions, 0 deletions
diff --git a/runtime/shared.rs b/runtime/shared.rs
new file mode 100644
index 000000000..e7ba109b0
--- /dev/null
+++ b/runtime/shared.rs
@@ -0,0 +1,107 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+// Utilities shared between `build.rs` and the rest of the crate.
+
+use deno_ast::MediaType;
+use deno_ast::ParseParams;
+use deno_ast::SourceTextInfo;
+use deno_core::error::AnyError;
+use deno_core::extension;
+use deno_core::Extension;
+use deno_core::ExtensionFileSource;
+use deno_core::ExtensionFileSourceCode;
+use std::path::Path;
+
+extension!(runtime,
+  deps = [
+    deno_webidl,
+    deno_console,
+    deno_url,
+    deno_tls,
+    deno_web,
+    deno_fetch,
+    deno_cache,
+    deno_websocket,
+    deno_webstorage,
+    deno_crypto,
+    deno_broadcast_channel,
+    deno_node,
+    deno_ffi,
+    deno_net,
+    deno_napi,
+    deno_http,
+    deno_io,
+    deno_fs
+  ],
+  esm_entry_point = "ext:runtime/90_deno_ns.js",
+  esm = [
+    dir "js",
+    "01_errors.js",
+    "01_version.ts",
+    "06_util.js",
+    "10_permissions.js",
+    "11_workers.js",
+    "13_buffer.js",
+    "30_os.js",
+    "40_fs_events.js",
+    "40_http.js",
+    "40_process.js",
+    "40_signals.js",
+    "40_tty.js",
+    "41_prompt.js",
+    "90_deno_ns.js",
+    "98_global_scope.js"
+  ],
+  customizer = |ext: &mut Extension| {
+    #[cfg(not(feature = "exclude_runtime_main_js"))]
+    {
+      ext.esm_files.to_mut().push(ExtensionFileSource {
+        specifier: "ext:runtime_main/js/99_main.js",
+        code: ExtensionFileSourceCode::IncludedInBinary(
+          include_str!("./js/99_main.js"),
+        ),
+      });
+      ext.esm_entry_point = Some("ext:runtime_main/js/99_main.js");
+    }
+  }
+);
+
+#[allow(dead_code)]
+pub fn maybe_transpile_source(
+  source: &mut ExtensionFileSource,
+) -> Result<(), AnyError> {
+  // Always transpile `node:` built-in modules, since they might be TypeScript.
+  let media_type = if source.specifier.starts_with("node:") {
+    MediaType::TypeScript
+  } else {
+    MediaType::from_path(Path::new(&source.specifier))
+  };
+
+  match media_type {
+    MediaType::TypeScript => {}
+    MediaType::JavaScript => return Ok(()),
+    MediaType::Mjs => return Ok(()),
+    _ => panic!(
+      "Unsupported media type for snapshotting {media_type:?} for file {}",
+      source.specifier
+    ),
+  }
+  let code = source.load()?;
+
+  let parsed = deno_ast::parse_module(ParseParams {
+    specifier: source.specifier.to_string(),
+    text_info: SourceTextInfo::from_string(code.as_str().to_owned()),
+    media_type,
+    capture_tokens: false,
+    scope_analysis: false,
+    maybe_syntax: None,
+  })?;
+  let transpiled_source = parsed.transpile(&deno_ast::EmitOptions {
+    imports_not_used_as_values: deno_ast::ImportsNotUsedAsValues::Remove,
+    inline_source_map: false,
+    ..Default::default()
+  })?;
+
+  source.code =
+    ExtensionFileSourceCode::Computed(transpiled_source.text.into());
+  Ok(())
+}