perf(ext): convert ext/io, ext/os, ext/net JS sources to lazy-loaded scripts (#33779)

bartlomieju · web-flow · commit 545e31eac9e9 · 2026-05-02T15:49:02.000+02:00
## Summary Follow-up to #33760. Converts the ESM JS sources in `ext/io`, `ext/os`, and `ext/net` to IIFE-wrapped lazy-loaded scripts (`lazy_loaded_js`), eliminating ESM module resolution overhead. These three extensions have no cross-extension ESM import dependencies (only `core.loadExtScript` calls to already-converted extensions like `ext/web`), so no `internals` bridges are needed. Converting these also unblocks clean conversion of: - `ext/fs` (depends on `ext/io`) - `ext/fetch` (depends on `ext/net`)
diff --git a/cli/js/40_bench.js b/cli/js/40_bench.js
@@ -8,7 +8,7 @@ import {
   restorePermissions,
 } from "ext:cli/40_test_common.js";
 const { Console } = core.loadExtScript("ext:deno_web/01_console.js");
-import { setExitHandler } from "ext:deno_os/30_os.js";
+const { setExitHandler } = core.loadExtScript("ext:deno_os/30_os.js");
 const {
   op_register_bench,
   op_bench_get_origin,
diff --git a/cli/js/40_test.js b/cli/js/40_test.js
@@ -31,7 +31,7 @@ const {
   TypeError,
 } = primordials;
 
-import { setExitHandler } from "ext:deno_os/30_os.js";
+const { setExitHandler } = core.loadExtScript("ext:deno_os/30_os.js");
 
 // Capture `Deno` global so that users deleting or mangling it, won't
 // have impact on our sanitizers.
diff --git a/ext/fetch/22_http_client.js b/ext/fetch/22_http_client.js
@@ -12,7 +12,7 @@
 
 import { core, primordials } from "ext:core/mod.js";
 import { op_fetch_custom_client } from "ext:core/ops";
-import { loadTlsKeyPair } from "ext:deno_net/02_tls.js";
+const { loadTlsKeyPair } = core.loadExtScript("ext:deno_net/02_tls.js");
 
 const { internalRidSymbol } = core;
 const {
diff --git a/ext/fs/30_fs.js b/ext/fs/30_fs.js
@@ -94,7 +94,9 @@ const {
   Uint32Array,
 } = primordials;
 
-import { read, readSync, write, writeSync } from "ext:deno_io/12_io.js";
+const { read, readSync, write, writeSync } = core.loadExtScript(
+  "ext:deno_io/12_io.js",
+);
 const abortSignal = core.loadExtScript("ext:deno_web/03_abort_signal.js");
 const {
   readableStreamForRid,
diff --git a/ext/http/00_serve.ts b/ext/http/00_serve.ts
@@ -79,12 +79,14 @@ const {
   ReadableStreamPrototype,
   resourceForReadableStream,
 } = core.loadExtScript("ext:deno_web/06_streams.js");
-import {
+const {
   listen,
   listenOptionApiName,
   UpgradedConn,
-} from "ext:deno_net/01_net.js";
-import { hasTlsKeyPairOptions, listenTls } from "ext:deno_net/02_tls.js";
+} = core.loadExtScript("ext:deno_net/01_net.js");
+const { hasTlsKeyPairOptions, listenTls } = core.loadExtScript(
+  "ext:deno_net/02_tls.js",
+);
 import {
   builtinTracer,
   ContextManager,
diff --git a/ext/io/12_io.js b/ext/io/12_io.js
@@ -1,11 +1,13 @@
 // Copyright 2018-2026 the Deno authors. MIT license.
+// deno-fmt-ignore-file
 
 // Interfaces 100% copied from Go.
 // Documentation liberally lifted from them too.
 // Thank you! We love Go! <3
 
-import { core, primordials } from "ext:core/mod.js";
-import { op_set_raw } from "ext:core/ops";
+(function () {
+const { core, primordials } = globalThis.__bootstrap;
+const { op_set_raw } = core.ops;
 const {
   Uint8Array,
   ArrayPrototypePush,
@@ -247,7 +249,7 @@ const stdin = new Stdin();
 const stdout = new Stdout();
 const stderr = new Stderr();
 
-export {
+return {
   read,
   readAll,
   readAllSync,
@@ -266,3 +268,4 @@ export {
   write,
   writeSync,
 };
+})()
diff --git a/ext/io/lib.rs b/ext/io/lib.rs
@@ -210,7 +210,7 @@ fn stdio_fd(fd: i32) -> StdFile {
 
 deno_core::extension!(deno_io,
   deps = [ deno_web ],
-  esm = [ "12_io.js" ],
+  lazy_loaded_js = [ "12_io.js" ],
   options = {
     stdio: Option<Stdio>,
   },
diff --git a/ext/net/01_net.js b/ext/net/01_net.js
@@ -1,14 +1,16 @@
 // Copyright 2018-2026 the Deno authors. MIT license.
+// deno-fmt-ignore-file
 
-import { core, primordials } from "ext:core/mod.js";
+(function () {
+const { core, primordials } = globalThis.__bootstrap;
 const {
   BadResourcePrototype,
   InterruptedPrototype,
   internalRidSymbol,
   internalFdSymbol,
   createCancelHandle,
 } = core;
-import {
+const {
   op_dns_resolve,
   op_net_accept_tcp,
   op_net_accept_tunnel,
@@ -34,7 +36,7 @@ import {
   op_net_set_multi_ttl_udp,
   op_set_keepalive,
   op_set_nodelay,
-} from "ext:core/ops";
+} = core.ops;
 const UDP_DGRAM_MAXSIZE = 65507;
 
 const {
@@ -741,7 +743,7 @@ async function connect(args) {
   }
 }
 
-export {
+return {
   Conn,
   connect,
   createListenDatagram,
@@ -759,3 +761,4 @@ export {
   validatePort,
   VsockConn,
 };
+})()
diff --git a/ext/net/02_tls.js b/ext/net/02_tls.js
@@ -1,8 +1,10 @@
 // Copyright 2018-2026 the Deno authors. MIT license.
+// deno-fmt-ignore-file
 
-import { core, internals, primordials } from "ext:core/mod.js";
+(function () {
+const { core, internals, primordials } = globalThis.__bootstrap;
 const { internalRidSymbol } = core;
-import {
+const {
   op_net_accept_tls,
   op_net_connect_tls,
   op_net_listen_tls,
@@ -15,15 +17,15 @@ import {
   op_tls_key_static,
   op_tls_peer_certificate,
   op_tls_start,
-} from "ext:core/ops";
+} = core.ops;
 const {
   ObjectDefineProperty,
   TypeError,
   Symbol,
   SymbolFor,
 } = primordials;
 
-import { Conn, Listener, validatePort } from "ext:deno_net/01_net.js";
+const { Conn, Listener, validatePort } = core.loadExtScript("ext:deno_net/01_net.js");
 
 const _getPeerCertificate = Symbol("getPeerCertificate");
 
@@ -255,7 +257,7 @@ internals.serverNameSymbol = serverNameSymbol;
 internals.createTlsKeyResolver = createTlsKeyResolver;
 internals.getPeerCertificate = _getPeerCertificate;
 
-export {
+return {
   connectTls,
   hasTlsKeyPairOptions,
   listenTls,
@@ -265,3 +267,4 @@ export {
   TlsConn,
   TlsListener,
 };
+})()
diff --git a/ext/net/03_quic.js b/ext/net/03_quic.js
@@ -45,7 +45,7 @@ const {
   WritableStream,
   writableStreamForRid,
 } = core.loadExtScript("ext:deno_web/06_streams.js");
-import { loadTlsKeyPair } from "ext:deno_net/02_tls.js";
+const { loadTlsKeyPair } = core.loadExtScript("ext:deno_net/02_tls.js");
 const {
   BadResourcePrototype,
 } = core;
diff --git a/ext/net/lib.rs b/ext/net/lib.rs
@@ -137,8 +137,8 @@ deno_core::extension!(deno_net,
     quic::webtransport::op_webtransport_accept,
     quic::webtransport::op_webtransport_connect,
   ],
-  esm = [ "01_net.js", "02_tls.js" ],
   lazy_loaded_esm = [ "03_quic.js" ],
+  lazy_loaded_js = [ "01_net.js", "02_tls.js" ],
   options = {
     root_cert_store_provider: Option<Arc<dyn RootCertStoreProvider>>,
     unsafely_ignore_certificate_errors: Option<Vec<String>>,
diff --git a/ext/node/polyfills/_process/streams.mjs b/ext/node/polyfills/_process/streams.mjs
@@ -1,7 +1,7 @@
 // Copyright 2018-2026 the Deno authors. MIT license.
 // Copyright Joyent, Inc. and Node.js contributors. All rights reserved. MIT license.
 
-import { primordials } from "ext:core/mod.js";
+import { core, primordials } from "ext:core/mod.js";
 const {
   Uint8ArrayPrototype,
   Error,
@@ -22,7 +22,7 @@ import {
 } from "ext:deno_node/internal/readline/callbacks.mjs";
 import { nextTick } from "ext:deno_node/_next_tick.ts";
 import { Duplex, Readable, Writable } from "node:stream";
-import * as io from "ext:deno_io/12_io.js";
+const io = core.loadExtScript("ext:deno_io/12_io.js");
 import { guessHandleType } from "ext:deno_node/internal_binding/util.ts";
 import { codeMap } from "ext:deno_node/internal_binding/uv.ts";
 import { op_bootstrap_color_depth } from "ext:core/ops";
diff --git a/ext/node/polyfills/internal/assert/assertion_error.js b/ext/node/polyfills/internal/assert/assertion_error.js
@@ -3,7 +3,7 @@
 
 // deno-lint-ignore-file prefer-primordials
 
-import { primordials } from "ext:core/mod.js";
+import { core, primordials } from "ext:core/mod.js";
 import { inspect } from "ext:deno_node/internal/util/inspect.mjs";
 import { isError } from "ext:deno_node/internal/util.mjs";
 import { isErrorStackTraceLimitWritable } from "ext:deno_node/internal/errors.ts";
@@ -14,7 +14,7 @@ import {
   printSimpleMyersDiff,
 } from "ext:deno_node/internal/assert/myers_diff.js";
 import { validateObject } from "ext:deno_node/internal/validators.mjs";
-import * as io from "ext:deno_io/12_io.js";
+const io = core.loadExtScript("ext:deno_io/12_io.js");
 
 function getConsoleWidth() {
   try {
diff --git a/ext/node/polyfills/internal/util/colors.ts b/ext/node/polyfills/internal/util/colors.ts
@@ -1,7 +1,8 @@
 // Copyright 2018-2026 the Deno authors. MIT license.
 // Copyright Node.js contributors. All rights reserved. MIT License.
 
-import * as io from "ext:deno_io/12_io.js";
+import { core } from "ext:core/mod.js";
+const io = core.loadExtScript("ext:deno_io/12_io.js");
 
 let blue = "";
 let green = "";
diff --git a/ext/node/polyfills/os.ts b/ext/node/polyfills/os.ts
@@ -34,9 +34,9 @@ import {
 import process from "node:process";
 import { isWindows } from "ext:deno_node/_util/os.ts";
 import { os } from "ext:deno_node/internal_binding/constants.ts";
-import { osUptime } from "ext:deno_os/30_os.js";
+const { osUptime } = core.loadExtScript("ext:deno_os/30_os.js");
 import { Buffer } from "ext:deno_node/internal/buffer.mjs";
-import { primordials } from "ext:core/mod.js";
+import { core, primordials } from "ext:core/mod.js";
 import { validateInt32 } from "ext:deno_node/internal/validators.mjs";
 import { denoErrorToNodeSystemError } from "ext:deno_node/internal/errors.ts";
 
diff --git a/ext/node/polyfills/process.ts b/ext/node/polyfills/process.ts
@@ -77,8 +77,8 @@ import {
 import { WriteStream as TTYWriteStream } from "ext:deno_node/internal/tty.js";
 import { enableNextTick } from "ext:deno_node/_next_tick.ts";
 import { isAndroid, isWindows } from "ext:deno_node/_util/os.ts";
-import * as io from "ext:deno_io/12_io.js";
-import * as denoOs from "ext:deno_os/30_os.js";
+const io = core.loadExtScript("ext:deno_io/12_io.js");
+const denoOs = core.loadExtScript("ext:deno_os/30_os.js");
 
 export let argv0 = "";
 
diff --git a/ext/os/30_os.js b/ext/os/30_os.js
@@ -1,7 +1,9 @@
 // Copyright 2018-2026 the Deno authors. MIT license.
+// deno-fmt-ignore-file
 
-import { core, primordials } from "ext:core/mod.js";
-import {
+(function () {
+const { core, primordials } = globalThis.__bootstrap;
+const {
   op_delete_env,
   op_env,
   op_exec_path,
@@ -18,7 +20,7 @@ import {
   op_set_exit_code,
   op_system_memory_info,
   op_uid,
-} from "ext:core/ops";
+} = core.ops;
 const {
   Error,
   FunctionPrototypeBind,
@@ -144,7 +146,7 @@ function execPath() {
   return op_exec_path();
 }
 
-export {
+return {
   env,
   execPath,
   exit,
@@ -160,3 +162,4 @@ export {
   systemMemoryInfo,
   uid,
 };
+})()
diff --git a/ext/os/40_signals.js b/ext/os/40_signals.js
@@ -1,7 +1,9 @@
 // Copyright 2018-2026 the Deno authors. MIT license.
+// deno-fmt-ignore-file
 
-import { core, primordials } from "ext:core/mod.js";
-import { op_signal_bind, op_signal_poll, op_signal_unbind } from "ext:core/ops";
+(function () {
+const { core, primordials } = globalThis.__bootstrap;
+const { op_signal_bind, op_signal_poll, op_signal_unbind } = core.ops;
 const {
   SafeSet,
   SafeSetIterator,
@@ -79,4 +81,5 @@ async function loop(sigData) {
   }
 }
 
-export { addSignalListener, removeSignalListener };
+return { addSignalListener, removeSignalListener };
+})()
diff --git a/ext/os/lib.rs b/ext/os/lib.rs
@@ -96,7 +96,7 @@ deno_core::extension!(
     ops::signal::op_signal_unbind,
     ops::signal::op_signal_poll,
   ],
-  esm = ["30_os.js", "40_signals.js"],
+  lazy_loaded_js = ["30_os.js", "40_signals.js"],
   options = {
     exit_code: Option<ExitCode>,
   },
diff --git a/ext/process/40_process.js b/ext/process/40_process.js
@@ -34,7 +34,7 @@ const {
 } = primordials;
 
 import { FsFile } from "ext:deno_fs/30_fs.js";
-import { readAll } from "ext:deno_io/12_io.js";
+const { readAll } = core.loadExtScript("ext:deno_io/12_io.js");
 const { assert, pathFromURL } = core.loadExtScript("ext:deno_web/00_infra.js");
 import { packageData } from "ext:deno_fetch/22_body.js";
 const abortSignal = core.loadExtScript("ext:deno_web/03_abort_signal.js");
diff --git a/runtime/js/41_prompt.js b/runtime/js/41_prompt.js
@@ -4,7 +4,7 @@ import { op_read_line_prompt } from "ext:core/ops";
 const { ArrayPrototypePush, StringPrototypeCharCodeAt, Uint8Array } =
   primordials;
 
-import { stdin } from "ext:deno_io/12_io.js";
+const { stdin } = core.loadExtScript("ext:deno_io/12_io.js");
 
 const LF = StringPrototypeCharCodeAt("\n", 0);
 const CR = StringPrototypeCharCodeAt("\r", 0);
diff --git a/runtime/js/90_deno_ns.js b/runtime/js/90_deno_ns.js
@@ -12,20 +12,20 @@ const timers = core.loadExtScript("ext:deno_web/02_timers.js");
 import * as httpClient from "ext:deno_fetch/22_http_client.js";
 const console = core.loadExtScript("ext:deno_web/01_console.js");
 import * as ffi from "ext:deno_ffi/00_ffi.js";
-import * as net from "ext:deno_net/01_net.js";
-import * as tls from "ext:deno_net/02_tls.js";
+const net = core.loadExtScript("ext:deno_net/01_net.js");
+const tls = core.loadExtScript("ext:deno_net/02_tls.js");
 import * as serve from "ext:deno_http/00_serve.ts";
 import * as http from "ext:deno_http/01_http.js";
 import * as websocket from "ext:deno_http/02_websocket.ts";
 import * as errors from "ext:runtime/01_errors.js";
 import * as version from "ext:runtime/01_version.ts";
 import * as permissions from "ext:runtime/10_permissions.js";
-import * as io from "ext:deno_io/12_io.js";
+const io = core.loadExtScript("ext:deno_io/12_io.js");
 import * as fs from "ext:deno_fs/30_fs.js";
-import * as os from "ext:deno_os/30_os.js";
+const os = core.loadExtScript("ext:deno_os/30_os.js");
 import * as fsEvents from "ext:runtime/40_fs_events.js";
 import * as process from "ext:deno_process/40_process.js";
-import * as signals from "ext:deno_os/40_signals.js";
+const signals = core.loadExtScript("ext:deno_os/40_signals.js");
 import * as tty from "ext:runtime/40_tty.js";
 import * as kv from "ext:deno_kv/01_db.ts";
 import * as cron from "ext:deno_cron/01_cron.ts";
diff --git a/runtime/js/99_main.js b/runtime/js/99_main.js
@@ -56,7 +56,7 @@ import { registerDeclarativeServer } from "ext:deno_http/00_serve.ts";
 const event = core.loadExtScript("ext:deno_web/02_event.js");
 const location = core.loadExtScript("ext:deno_web/12_location.js");
 import * as version from "ext:runtime/01_version.ts";
-import * as os from "ext:deno_os/30_os.js";
+const os = core.loadExtScript("ext:deno_os/30_os.js");
 const {
   getConsoleInspectOptions,
   getDefaultInspectOptions,
diff --git a/tests/integration/run_tests.rs b/tests/integration/run_tests.rs
@@ -437,7 +437,7 @@ fn permissions_trace() {
       test_util::assertions::assert_wildcard_match(&text, concat!(
       "┏ ⚠️  Deno requests sys access to \"hostname\".\r\n",
       "┠─ Requested by `Deno.hostname()` API.\r\n",
-      "┃  ├─ Object.hostname (ext:deno_os/30_os.js:43:10)\r\n",
+      "┃  ├─ Object.hostname (ext:deno_os/30_os.js:45:10)\r\n",
       "┃  ├─ foo (file://[WILDCARD]/run/permissions_trace.ts:2:8)\r\n",
       "┃  ├─ bar (file://[WILDCARD]/run/permissions_trace.ts:6:3)\r\n",
       "┃  └─ file://[WILDCARD]/run/permissions_trace.ts:9:1\r\n",
