namespace reorg: libdeno and DenoCore to Deno.core (#1998)

26 files changed, 178 insertions, 146 deletions

diff --git a/BUILD.gn b/BUILD.gn
index 41a84613e..bde36a7f2 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -82,7 +82,6 @@ ts_sources = [
   "js/globals.ts",
   "js/headers.ts",
   "js/io.ts",
-  "js/libdeno.ts",
   "js/lib.web_assembly.d.ts",
   "js/location.ts",
   "js/main.ts",
diff --git a/cli/ops.rs b/cli/ops.rs
index a0605f64b..68e593934 100644
--- a/cli/ops.rs
+++ b/cli/ops.rs
@@ -69,9 +69,9 @@ fn empty_buf() -> Buf {
 }
 
 /// Processes raw messages from JavaScript.
-/// This functions invoked every time libdeno.send() is called.
-/// control corresponds to the first argument of libdeno.send().
-/// data corresponds to the second argument of libdeno.send().
+/// This functions invoked every time Deno.core.dispatch() is called.
+/// control corresponds to the first argument of Deno.core.dispatch().
+/// data corresponds to the second argument of Deno.core.dispatch().
 pub fn dispatch_all(
   sc: &IsolateStateContainer,
   control: &[u8],
diff --git a/core/core.d.ts b/core/core.d.ts
new file mode 100644
index 000000000..b1d1ac57f
--- /dev/null
+++ b/core/core.d.ts
@@ -0,0 +1,25 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+
+// This file contains APIs that are introduced into the global namespace by
+// Deno core.  These are not intended to be used directly by runtime users of
+// Deno and therefore do not flow through to the runtime type library.
+
+declare interface MessageCallback {
+  (msg: Uint8Array): void;
+}
+
+declare interface DenoCore {
+  dispatch(
+    control: Uint8Array,
+    zeroCopy?: ArrayBufferView | null
+  ): Uint8Array | null;
+  setAsyncHandler(cb: MessageCallback): void;
+  sharedQueue: {
+    head(): number;
+    numRecords(): number;
+    size(): number;
+    push(buf: Uint8Array): boolean;
+    reset(): void;
+    shift(): Uint8Array | null;
+  };
+}
diff --git a/core/http_bench.js b/core/http_bench.js
index d7cffcb75..8eb764b55 100644
--- a/core/http_bench.js
+++ b/core/http_bench.js
@@ -42,7 +42,7 @@ function send(promiseId, opId, arg, zeroCopy = null) {
   scratch32[1] = opId;
   scratch32[2] = arg;
   scratch32[3] = -1;
-  return DenoCore.dispatch(scratchBytes, zeroCopy);
+  return Deno.core.dispatch(scratchBytes, zeroCopy);
 }
 
 /** Returns Promise<number> */
@@ -123,17 +123,17 @@ async function serve(rid) {
 }
 
 async function main() {
-  DenoCore.setAsyncHandler(handleAsyncMsgFromRust);
+  Deno.core.setAsyncHandler(handleAsyncMsgFromRust);
 
-  libdeno.print("http_bench.js start\n");
+  Deno.core.print("http_bench.js start\n");
 
   const listenerRid = listen();
-  libdeno.print(`listening http://127.0.0.1:4544/ rid = ${listenerRid}\n`);
+  Deno.core.print(`listening http://127.0.0.1:4544/ rid = ${listenerRid}\n`);
   while (true) {
     const rid = await accept(listenerRid);
-    // libdeno.print(`accepted ${rid}`);
+    // Deno.core.print(`accepted ${rid}`);
     if (rid < 0) {
-      libdeno.print(`accept error ${rid}`);
+      Deno.core.print(`accept error ${rid}`);
       return;
     }
     serve(rid);
diff --git a/core/isolate.rs b/core/isolate.rs
index 74b8a7270..b28730ba6 100644
--- a/core/isolate.rs
+++ b/core/isolate.rs
@@ -63,8 +63,8 @@ pub trait Behavior {
   /// Isolate is created.
   fn startup_data(&mut self) -> Option<StartupData>;
 
-  /// Called whenever libdeno.send() is called in JavaScript. zero_copy_buf
-  /// corresponds to the second argument of libdeno.send().
+  /// Called whenever Deno.core.send() is called in JavaScript. zero_copy_buf
+  /// corresponds to the second argument of Deno.core.send().
   fn dispatch(
     &mut self,
     control: &[u8],
@@ -77,7 +77,7 @@ pub trait Behavior {
 /// Tokio.  The Isolate future complete when there is an error or when all
 /// pending ops have completed.
 ///
-/// Ops are created in JavaScript by calling libdeno.send(), and in Rust by
+/// Ops are created in JavaScript by calling Deno.core.send(), and in Rust by
 /// implementing Behavior::dispatch. An Op corresponds exactly to a Promise in
 /// JavaScript.
 pub struct Isolate<B: Behavior> {
@@ -125,7 +125,7 @@ impl<B: Behavior> Isolate<B> {
         None => libdeno::deno_buf::empty(),
       },
       shared: shared.as_deno_buf(),
-      recv_cb: Self::pre_dispatch,
+      recv_cb: Self::predispatch,
     };
     let libdeno_isolate = unsafe { libdeno::deno_new(config) };
 
@@ -157,7 +157,7 @@ impl<B: Behavior> Isolate<B> {
     }
   }
 
-  /// Executes a bit of built-in JavaScript to provide Deno._sharedQueue.
+  /// Executes a bit of built-in JavaScript to provide Deno.sharedQueue.
   pub fn shared_init(&mut self) {
     if self.needs_init {
       self.needs_init = false;
@@ -167,7 +167,7 @@ impl<B: Behavior> Isolate<B> {
     }
   }
 
-  extern "C" fn pre_dispatch(
+  extern "C" fn predispatch(
     user_data: *mut c_void,
     control_argv0: deno_buf,
     zero_copy_buf: deno_buf,
@@ -178,12 +178,12 @@ impl<B: Behavior> Isolate<B> {
     let control_shared = isolate.shared.shift();
 
     let (is_sync, op) = if control_argv0.len() > 0 {
-      // The user called libdeno.send(control)
+      // The user called Deno.core.send(control)
       isolate
         .behavior
         .dispatch(control_argv0.as_ref(), zero_copy_buf)
     } else if let Some(c) = control_shared {
-      // The user called Deno._sharedQueue.push(control)
+      // The user called Deno.sharedQueue.push(control)
       isolate.behavior.dispatch(&c, zero_copy_buf)
     } else {
       // The sharedQueue is empty. The shouldn't happen usually, but it's also
@@ -199,7 +199,7 @@ impl<B: Behavior> Isolate<B> {
 
     if is_sync {
       let res_record = op.wait().unwrap();
-      // For sync messages, we always return the response via libdeno.send's
+      // For sync messages, we always return the response via Deno.core.send's
       // return value.
       // TODO(ry) check that if JSError thrown during respond(), that it will be
       // picked up.
@@ -614,15 +614,15 @@ mod tests {
   }
 
   #[test]
-  fn test_dispatch() {
+  fn testdispatch() {
     let mut isolate = TestBehavior::setup(TestBehaviorMode::AsyncImmediate);
     js_check(isolate.execute(
       "filename.js",
       r#"
         let control = new Uint8Array([42]);
-        libdeno.send(control);
+        Deno.core.send(control);
         async function main() {
-          libdeno.send(control);
+          Deno.core.send(control);
         }
         main();
         "#,
@@ -641,7 +641,7 @@ mod tests {
         import { b } from 'b.js'
         if (b() != 'b') throw Error();
         let control = new Uint8Array([42]);
-        libdeno.send(control);
+        Deno.core.send(control);
       "#,
       ).unwrap();
     assert_eq!(isolate.behavior.dispatch_count, 0);
@@ -685,7 +685,7 @@ mod tests {
       "setup2.js",
       r#"
         let nrecv = 0;
-        DenoCore.setAsyncHandler((buf) => {
+        Deno.core.setAsyncHandler((buf) => {
           nrecv++;
         });
         "#,
@@ -696,7 +696,7 @@ mod tests {
       r#"
         assert(nrecv == 0);
         let control = new Uint8Array([42]);
-        libdeno.send(control);
+        Deno.core.send(control);
         assert(nrecv == 0);
         "#,
     ));
@@ -707,7 +707,7 @@ mod tests {
       "check2.js",
       r#"
         assert(nrecv == 1);
-        libdeno.send(control);
+        Deno.core.send(control);
         assert(nrecv == 1);
         "#,
     ));
@@ -727,7 +727,7 @@ mod tests {
       "setup2.js",
       r#"
         let nrecv = 0;
-        DenoCore.setAsyncHandler((buf) => {
+        Deno.core.setAsyncHandler((buf) => {
           assert(buf.byteLength === 1);
           assert(buf[0] === 43);
           nrecv++;
@@ -740,12 +740,12 @@ mod tests {
       "send1.js",
       r#"
         let control = new Uint8Array([42]);
-        DenoCore.shared.push(control);
-        libdeno.send();
+        Deno.core.sharedQueue.push(control);
+        Deno.core.send();
         assert(nrecv === 0);
 
-        DenoCore.shared.push(control);
-        libdeno.send();
+        Deno.core.sharedQueue.push(control);
+        Deno.core.send();
         assert(nrecv === 0);
         "#,
     ));
@@ -832,10 +832,10 @@ mod tests {
       "overflow_req_sync.js",
       r#"
         let asyncRecv = 0;
-        DenoCore.setAsyncHandler((buf) => { asyncRecv++ });
+        Deno.core.setAsyncHandler((buf) => { asyncRecv++ });
         // Large message that will overflow the shared space.
         let control = new Uint8Array(100 * 1024 * 1024);
-        let response = DenoCore.dispatch(control);
+        let response = Deno.core.dispatch(control);
         assert(response instanceof Uint8Array);
         assert(response.length == 1);
         assert(response[0] == 43);
@@ -854,10 +854,10 @@ mod tests {
       "overflow_res_sync.js",
       r#"
         let asyncRecv = 0;
-        DenoCore.setAsyncHandler((buf) => { asyncRecv++ });
+        Deno.core.setAsyncHandler((buf) => { asyncRecv++ });
         // Large message that will overflow the shared space.
         let control = new Uint8Array([42]);
-        let response = DenoCore.dispatch(control);
+        let response = Deno.core.dispatch(control);
         assert(response instanceof Uint8Array);
         assert(response.length == 100 * 1024 * 1024);
         assert(response[0] == 99);
@@ -874,14 +874,14 @@ mod tests {
       "overflow_req_async.js",
       r#"
         let asyncRecv = 0;
-        DenoCore.setAsyncHandler((buf) => {
+        Deno.core.setAsyncHandler((buf) => {
           assert(buf.byteLength === 1);
           assert(buf[0] === 43);
           asyncRecv++;
         });
         // Large message that will overflow the shared space.
         let control = new Uint8Array(100 * 1024 * 1024);
-        let response = DenoCore.dispatch(control);
+        let response = Deno.core.dispatch(control);
         // Async messages always have null response.
         assert(response == null);
         assert(asyncRecv == 0);
@@ -901,14 +901,14 @@ mod tests {
       "overflow_res_async.js",
       r#"
         let asyncRecv = 0;
-        DenoCore.setAsyncHandler((buf) => {
+        Deno.core.setAsyncHandler((buf) => {
           assert(buf.byteLength === 100 * 1024 * 1024);
           assert(buf[0] === 4);
           asyncRecv++;
         });
         // Large message that will overflow the shared space.
         let control = new Uint8Array([42]);
-        let response = DenoCore.dispatch(control);
+        let response = Deno.core.dispatch(control);
         assert(response == null);
         assert(asyncRecv == 0);
         "#,
@@ -919,27 +919,27 @@ mod tests {
   }
 
   #[test]
-  fn overflow_res_multiple_dispatch_async() {
+  fn overflow_res_multipledispatch_async() {
     // TODO(ry) This test is quite slow due to memcpy-ing 100MB into JS. We
     // should optimize this.
     let mut isolate = TestBehavior::setup(TestBehaviorMode::OverflowResAsync);
     js_check(isolate.execute(
-      "overflow_res_multiple_dispatch_async.js",
+      "overflow_res_multipledispatch_async.js",
       r#"
         let asyncRecv = 0;
-        DenoCore.setAsyncHandler((buf) => {
+        Deno.core.setAsyncHandler((buf) => {
           assert(buf.byteLength === 100 * 1024 * 1024);
           assert(buf[0] === 4);
           asyncRecv++;
         });
         // Large message that will overflow the shared space.
         let control = new Uint8Array([42]);
-        let response = DenoCore.dispatch(control);
+        let response = Deno.core.dispatch(control);
         assert(response == null);
         assert(asyncRecv == 0);
         // Dispatch another message to verify that pending ops
         // are done even if shared space overflows
-        DenoCore.dispatch(control);
+        Deno.core.dispatch(control);
         "#,
     ));
     assert_eq!(isolate.behavior.dispatch_count, 2);
diff --git a/core/shared_queue.js b/core/shared_queue.js
index 6c9a0326f..02aded748 100644
--- a/core/shared_queue.js
+++ b/core/shared_queue.js
@@ -1,5 +1,8 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+
 (window => {
+  const GLOBAL_NAMESPACE = "Deno";
+  const CORE_NAMESPACE = "core";
   const MAX_RECORDS = 100;
   const INDEX_NUM_RECORDS = 0;
   const INDEX_NUM_SHIFTED_OFF = 1;
@@ -8,8 +11,11 @@
   const INDEX_RECORDS = 3 + MAX_RECORDS;
   const HEAD_INIT = 4 * INDEX_RECORDS;
 
-  let sharedBytes = null;
-  let shared32 = null;
+  const Deno = window[GLOBAL_NAMESPACE];
+  const core = Deno[CORE_NAMESPACE];
+
+  let sharedBytes;
+  let shared32;
 
   function assert(cond) {
     if (!cond) {
@@ -92,10 +98,12 @@
       reset();
     }
 
+    assert(off != null);
+    assert(end != null);
     return sharedBytes.subarray(off, end);
   }
 
-  let asyncHandler = null;
+  let asyncHandler;
   function setAsyncHandler(cb) {
     assert(asyncHandler == null);
     asyncHandler = cb;
@@ -117,23 +125,22 @@
     assert(shared32 == null);
     sharedBytes = new Uint8Array(shared);
     shared32 = new Int32Array(shared);
-    // Callers should not call libdeno.recv, use setAsyncHandler.
-    libdeno.recv(handleAsyncMsgFromRust);
+    // Callers should not call Deno.core.recv, use setAsyncHandler.
+    window.Deno.core.recv(handleAsyncMsgFromRust);
   }
 
   function dispatch(control, zeroCopy = null) {
     // First try to push control to shared.
     const success = push(control);
-    // If successful, don't use first argument of libdeno.send.
+    // If successful, don't use first argument of core.send.
     const arg0 = success ? null : control;
-    return libdeno.send(arg0, zeroCopy);
+    return window.Deno.core.send(arg0, zeroCopy);
   }
 
-  assert(!window["DenoCore"]);
-  window["DenoCore"] = {
+  const denoCore = {
     setAsyncHandler,
     dispatch,
-    shared: {
+    sharedQueue: {
       head,
       numRecords,
       size,
@@ -143,5 +150,9 @@
     }
   };
 
-  init(libdeno.shared);
-})(this);
+  assert(window[GLOBAL_NAMESPACE] != null);
+  assert(window[GLOBAL_NAMESPACE][CORE_NAMESPACE] != null);
+  Object.assign(core, denoCore);
+
+  init(Deno.core.shared);
+})(globalThis);
diff --git a/core/shared_queue_test.js b/core/shared_queue_test.js
index 817bb3bcd..75a877930 100644
--- a/core/shared_queue_test.js
+++ b/core/shared_queue_test.js
@@ -7,7 +7,7 @@ function assert(cond) {
 }
 
 function main() {
-  const q = DenoCore.shared;
+  const q = Deno.core.sharedQueue;
 
   let h = q.head();
   assert(h > 0);
@@ -56,7 +56,7 @@ function main() {
   assert(q.numRecords() == 0);
   assert(q.size() == 0);
 
-  libdeno.print("shared_queue_test.js ok\n");
+  Deno.core.print("shared_queue_test.js ok\n");
 }
 
 main();
diff --git a/js/compiler.ts b/js/compiler.ts
index aefdf989d..8be78935f 100644
--- a/js/compiler.ts
+++ b/js/compiler.ts
@@ -4,7 +4,7 @@ import * as msg from "gen/msg_generated";
 import { window } from "./window";
 import { assetSourceCode } from "./assets";
 import { Console } from "./console";
-import { libdeno } from "./libdeno";
+import { core } from "./core";
 import * as os from "./os";
 import { TextDecoder, TextEncoder } from "./text_encoding";
 import { clearTimer, setTimeout } from "./timers";
@@ -16,7 +16,7 @@ const ASSETS = "$asset$";
 const LIB_RUNTIME = `${ASSETS}/lib.deno_runtime.d.ts`;
 
 // An instance of console
-const console = new Console(libdeno.print);
+const console = new Console(core.print);
 
 /** The location that a module is being loaded from. This could be a directory,
  * like `.`, or it could be a module specifier like
diff --git a/js/console.ts b/js/console.ts
index b68794d3f..3669a1d3b 100644
--- a/js/console.ts
+++ b/js/console.ts
@@ -5,7 +5,7 @@ import { TextEncoder } from "./text_encoding";
 import { File, stdout } from "./files";
 import { cliTable } from "./console_table";
 import { formatError } from "./format_error";
-import { libdeno } from "./libdeno";
+import { core } from "./core";
 
 type ConsoleContext = Set<unknown>;
 type ConsoleOptions = Partial<{
@@ -323,7 +323,7 @@ function createObjectString(
   ...args: [ConsoleContext, number, number]
 ): string {
   if (value instanceof Error) {
-    const errorJSON = libdeno.errorToJSON(value);
+    const errorJSON = core.errorToJSON(value);
     return formatError(errorJSON);
   } else if (Array.isArray(value)) {
     return createArrayString(value, ...args);
diff --git a/js/core.ts b/js/core.ts
index 9e94ffdbb..03473ff3d 100644
--- a/js/core.ts
+++ b/js/core.ts
@@ -1,13 +1,4 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { window } from "./window";
 
-type MessageCallback = (msg: Uint8Array) => void;
-
-// Declared in core/shared_queue.js.
-interface DenoCore {
-  setAsyncHandler(cb: MessageCallback): void;
-  dispatch(control: Uint8Array, zeroCopy?: Uint8Array): null | Uint8Array;
-}
-
-// TODO(ry) Rename to Deno.core.shared and Deno.core.setAsyncHandler.
-export const DenoCore = window.DenoCore as DenoCore;
+export const core = window.Deno.core as DenoCore;
diff --git a/js/deno.ts b/js/deno.ts
index d663ca55c..ed42dc89a 100644
--- a/js/deno.ts
+++ b/js/deno.ts
@@ -49,7 +49,6 @@ export { statSync, lstatSync, stat, lstat } from "./stat";
 export { symlinkSync, symlink } from "./symlink";
 export { writeFileSync, writeFile, WriteFileOptions } from "./write_file";
 export { ErrorKind, DenoError } from "./errors";
-export { libdeno } from "./libdeno";
 export {
   permissions,
   revokePermission,
@@ -67,6 +66,11 @@ export { build, platform, OperatingSystem, Arch } from "./build";
 export { version } from "./version";
 export const args: string[] = [];
 
+// These are internal Deno APIs.  We are marking them as internal so they do not
+// appear in the runtime type library.
+/** @internal */
+export { core } from "./core";
+
 // TODO Don't expose Console nor stringifyArgs.
 /** @internal */
 export { Console, stringifyArgs } from "./console";
diff --git a/js/dispatch.ts b/js/dispatch.ts
index 2e6cbf10f..3ca0cd799 100644
--- a/js/dispatch.ts
+++ b/js/dispatch.ts
@@ -1,5 +1,5 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
-import { window } from "./window";
+import { core } from "./core";
 import * as flatbuffers from "./flatbuffers";
 import * as msg from "gen/msg_generated";
 import * as errors from "./errors";
@@ -39,7 +39,7 @@ function sendInternal(
   builder.finish(msg.Base.endBase(builder));
 
   const control = builder.asUint8Array();
-  const response = window.DenoCore.dispatch(control, zeroCopy);
+  const response = core.dispatch(control, zeroCopy);
 
   builder.inUse = false;
   return [cmdId, response];
diff --git a/js/event.ts b/js/event.ts
index 61f21f2e7..8cd4d22d3 100644
--- a/js/event.ts
+++ b/js/event.ts
@@ -21,7 +21,7 @@ export class EventInit implements domTypes.EventInit {
 export class Event implements domTypes.Event {
   // Each event has the following associated flags
   private _canceledFlag = false;
-  private _dispatchedFlag = false;
+  private dispatchedFlag = false;
   private _initializedFlag = false;
   private _inPassiveListenerFlag = false;
   private _stopImmediatePropagationFlag = false;
@@ -76,7 +76,7 @@ export class Event implements domTypes.Event {
   }
 
   get dispatched(): boolean {
-    return this._dispatchedFlag;
+    return this.dispatchedFlag;
   }
 
   get eventPhase(): number {
diff --git a/js/flatbuffers.ts b/js/flatbuffers.ts
index 73f3ceb82..f05bd1c55 100644
--- a/js/flatbuffers.ts
+++ b/js/flatbuffers.ts
@@ -17,7 +17,7 @@ globalBuilder.inUse = false;
 // This is a wrapper around the real Builder .
 // The purpose is to reuse a single ArrayBuffer for every message.
 // We can do this because the "control" messages sent to the privileged
-// side are guaranteed to be used during the call to libdeno.send().
+// side are guaranteed to be used during the call to Deno.core.send().
 export function createBuilder(): Builder {
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
   const gb = globalBuilder as any;
diff --git a/js/globals.ts b/js/globals.ts
index af99ae7e0..5a0fb18ce 100644
--- a/js/globals.ts
+++ b/js/globals.ts
@@ -27,7 +27,7 @@ import * as performanceUtil from "./performance";
 
 // These imports are not exposed and therefore are fine to just import the
 // symbols required.
-import { libdeno } from "./libdeno";
+import { core } from "./core";
 
 // During the build process, augmentations to the variable `window` in this
 // file are tracked and created as part of default library that is built into
@@ -43,7 +43,6 @@ window.window = window;
 // This is the Deno namespace, it is handled differently from other window
 // properties when building the runtime type library, as the whole module
 // is flattened into a single namespace.
-
 window.Deno = deno;
 Object.freeze(window.Deno);
 
@@ -53,7 +52,7 @@ window.btoa = textEncoding.btoa;
 window.fetch = fetchTypes.fetch;
 window.clearTimeout = timers.clearTimer;
 window.clearInterval = timers.clearTimer;
-window.console = new consoleTypes.Console(libdeno.print);
+window.console = new consoleTypes.Console(core.print);
 window.setTimeout = timers.setTimeout;
 window.setInterval = timers.setInterval;
 window.location = (undefined as unknown) as domTypes.Location;
diff --git a/js/os.ts b/js/os.ts
index c96416935..0ad107bf1 100644
--- a/js/os.ts
+++ b/js/os.ts
@@ -1,6 +1,6 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import * as msg from "gen/msg_generated";
-import { window } from "./window";
+import { core } from "./core";
 import { handleAsyncMsgFromRust, sendSync } from "./dispatch";
 import * as flatbuffers from "./flatbuffers";
 import { TextDecoder } from "./text_encoding";
@@ -16,12 +16,7 @@ export let noColor: boolean;
 /** Path to the current deno process's executable file. */
 export let execPath: string;
 
-/** @internal */
-export function setGlobals(
-  pid_: number,
-  noColor_: boolean,
-  execPath_: string
-): void {
+function setGlobals(pid_: number, noColor_: boolean, execPath_: string): void {
   assert(!pid);
   pid = pid_;
   noColor = noColor_;
@@ -169,7 +164,7 @@ function sendStart(): msg.StartRes {
 // the runtime and the compiler environments.
 // @internal
 export function start(source?: string): msg.StartRes {
-  window.DenoCore.setAsyncHandler(handleAsyncMsgFromRust);
+  core.setAsyncHandler(handleAsyncMsgFromRust);
 
   // First we send an empty `Start` message to let the privileged side know we
   // are ready. The response should be a `StartRes` message containing the CLI
diff --git a/js/repl.ts b/js/repl.ts
index c39a79a7d..068501873 100644
--- a/js/repl.ts
+++ b/js/repl.ts
@@ -6,7 +6,7 @@ import { close } from "./files";
 import * as dispatch from "./dispatch";
 import { exit } from "./os";
 import { window } from "./window";
-import { libdeno } from "./libdeno";
+import { core } from "./core";
 import { formatError } from "./format_error";
 
 const helpMsg = [
@@ -90,7 +90,7 @@ function isRecoverableError(e: Error): boolean {
 // Returns true if code is consumed (no error/irrecoverable error).
 // Returns false if error is recoverable
 function evaluate(code: string): boolean {
-  const [result, errInfo] = libdeno.evalContext(code);
+  const [result, errInfo] = core.evalContext(code);
   if (!errInfo) {
     console.log(result);
   } else if (errInfo.isCompileError && isRecoverableError(errInfo.thrown)) {
@@ -99,7 +99,7 @@ function evaluate(code: string): boolean {
   } else {
     if (errInfo.isNativeError) {
       const formattedError = formatError(
-        libdeno.errorToJSON(errInfo.thrown as Error)
+        core.errorToJSON(errInfo.thrown as Error)
       );
       console.error(formattedError);
     } else {
@@ -140,7 +140,7 @@ export async function replLoop(): Promise<void> {
         if (err.message !== "Interrupted") {
           // e.g. this happens when we have deno.close(3).
           // We want to display the problem.
-          const formattedError = formatError(libdeno.errorToJSON(err));
+          const formattedError = formatError(core.errorToJSON(err));
           console.error(formattedError);
         }
         // Quit REPL anyways.
@@ -162,7 +162,7 @@ export async function replLoop(): Promise<void> {
         } else {
           // e.g. this happens when we have deno.close(3).
           // We want to display the problem.
-          const formattedError = formatError(libdeno.errorToJSON(err));
+          const formattedError = formatError(core.errorToJSON(err));
           console.error(formattedError);
           quitRepl(1);
         }
diff --git a/libdeno/api.cc b/libdeno/api.cc
index ab87382c3..fa1fe92f9 100644
--- a/libdeno/api.cc
+++ b/libdeno/api.cc
@@ -177,7 +177,7 @@ void deno_respond(Deno* d_, void* user_data, deno_buf buf) {
 
   auto recv_ = d->recv_.Get(d->isolate_);
   if (recv_.IsEmpty()) {
-    d->last_exception_ = "libdeno.recv_ has not been called.";
+    d->last_exception_ = "Deno.core.recv has not been called.";
     return;
   }
 
diff --git a/libdeno/binding.cc b/libdeno/binding.cc
index c291852da..ab633f46d 100644
--- a/libdeno/binding.cc
+++ b/libdeno/binding.cc
@@ -232,7 +232,7 @@ void Recv(const v8::FunctionCallbackInfo<v8::Value>& args) {
   v8::HandleScope handle_scope(isolate);
 
   if (!d->recv_.IsEmpty()) {
-    isolate->ThrowException(v8_str("libdeno.recv_ already called."));
+    isolate->ThrowException(v8_str("Deno.core.recv already called."));
     return;
   }
 
@@ -485,33 +485,36 @@ void InitializeContext(v8::Isolate* isolate, v8::Local<v8::Context> context) {
   auto global = context->Global();
 
   auto deno_val = v8::Object::New(isolate);
-  CHECK(global->Set(context, deno::v8_str("libdeno"), deno_val).FromJust());
+  CHECK(global->Set(context, deno::v8_str("Deno"), deno_val).FromJust());
+
+  auto core_val = v8::Object::New(isolate);
+  CHECK(deno_val->Set(context, deno::v8_str("core"), core_val).FromJust());
 
   auto print_tmpl = v8::FunctionTemplate::New(isolate, Print);
   auto print_val = print_tmpl->GetFunction(context).ToLocalChecked();
-  CHECK(deno_val->Set(context, deno::v8_str("print"), print_val).FromJust());
+  CHECK(core_val->Set(context, deno::v8_str("print"), print_val).FromJust());
 
   auto recv_tmpl = v8::FunctionTemplate::New(isolate, Recv);
   auto recv_val = recv_tmpl->GetFunction(context).ToLocalChecked();
-  CHECK(deno_val->Set(context, deno::v8_str("recv"), recv_val).FromJust());
+  CHECK(core_val->Set(context, deno::v8_str("recv"), recv_val).FromJust());
 
   auto send_tmpl = v8::FunctionTemplate::New(isolate, Send);
   auto send_val = send_tmpl->GetFunction(context).ToLocalChecked();
-  CHECK(deno_val->Set(context, deno::v8_str("send"), send_val).FromJust());
+  CHECK(core_val->Set(context, deno::v8_str("send"), send_val).FromJust());
 
   auto eval_context_tmpl = v8::FunctionTemplate::New(isolate, EvalContext);
   auto eval_context_val =
       eval_context_tmpl->GetFunction(context).ToLocalChecked();
-  CHECK(deno_val->Set(context, deno::v8_str("evalContext"), eval_context_val)
+  CHECK(core_val->Set(context, deno::v8_str("evalContext"), eval_context_val)
             .FromJust());
 
   auto error_to_json_tmpl = v8::FunctionTemplate::New(isolate, ErrorToJSON);
   auto error_to_json_val =
       error_to_json_tmpl->GetFunction(context).ToLocalChecked();
-  CHECK(deno_val->Set(context, deno::v8_str("errorToJSON"), error_to_json_val)
+  CHECK(core_val->Set(context, deno::v8_str("errorToJSON"), error_to_json_val)
             .FromJust());
 
-  CHECK(deno_val->SetAccessor(context, deno::v8_str("shared"), Shared)
+  CHECK(core_val->SetAccessor(context, deno::v8_str("shared"), Shared)
             .FromJust());
 }
 
diff --git a/libdeno/deno.h b/libdeno/deno.h
index f3902985e..37a302cad 100644
--- a/libdeno/deno.h
+++ b/libdeno/deno.h
@@ -23,8 +23,8 @@ typedef struct deno_s Deno;
 // A callback to receive a message from a libdeno.send() javascript call.
 // control_buf is valid for only for the lifetime of this callback.
 // data_buf is valid until deno_respond() is called.
-typedef void (*deno_recv_cb)(void* user_data, deno_buf control_buf,
-                             deno_buf zerop_copy_buf);
+typedef void (*denorecv_cb)(void* user_data, deno_buf control_buf,
+                            deno_buf zerop_copy_buf);
 
 void deno_init();
 const char* deno_v8_version();
@@ -34,7 +34,7 @@ typedef struct {
   int will_snapshot;       // Default 0. If calling deno_get_snapshot 1.
   deno_buf load_snapshot;  // Optionally: A deno_buf from deno_get_snapshot.
   deno_buf shared;         // Shared buffer to be mapped to libdeno.shared
-  deno_recv_cb recv_cb;    // Maps to libdeno.send() calls.
+  denorecv_cb recv_cb;     // Maps to libdeno.send() calls.
 } deno_config;
 
 // Create a new deno isolate.
@@ -57,13 +57,13 @@ void deno_unlock(Deno* d);
 void deno_execute(Deno* d, void* user_data, const char* js_filename,
                   const char* js_source);
 
-// deno_respond sends up to one message back for every deno_recv_cb made.
+// deno_respond sends up to one message back for every denorecv_cb made.
 //
-// If this is called during deno_recv_cb, the issuing libdeno.send() in
+// If this is called during denorecv_cb, the issuing libdeno.send() in
 // javascript will synchronously return the specified buf as an ArrayBuffer (or
 // null if buf is empty).
 //
-// If this is called after deno_recv_cb has returned, the deno_respond
+// If this is called after denorecv_cb has returned, the deno_respond
 // will call into the JS callback specified by libdeno.recv().
 //
 // (Ideally, but not currently: After calling deno_respond(), the caller no
diff --git a/libdeno/internal.h b/libdeno/internal.h
index 71cf731b6..54e845965 100644
--- a/libdeno/internal.h
+++ b/libdeno/internal.h
@@ -104,7 +104,7 @@ class DenoIsolate {
   const v8::FunctionCallbackInfo<v8::Value>* current_args_;
   v8::SnapshotCreator* snapshot_creator_;
   void* global_import_buf_ptr_;
-  deno_recv_cb recv_cb_;
+  denorecv_cb recv_cb_;
   size_t next_zero_copy_id_;
   void* user_data_;
 
@@ -170,7 +170,7 @@ static intptr_t external_references[] = {
 
 static const deno_buf empty_buf = {nullptr, 0, nullptr, 0, 0};
 
-Deno* NewFromSnapshot(void* user_data, deno_recv_cb cb);
+Deno* NewFromSnapshot(void* user_data, denorecv_cb cb);
 
 void InitializeContext(v8::Isolate* isolate, v8::Local<v8::Context> context);
 
diff --git a/js/libdeno.ts b/libdeno/libdeno.d.ts
index 485e67bb9..1bc7367d9 100644
--- a/js/libdeno.ts
+++ b/libdeno/libdeno.d.ts
@@ -1,8 +1,4 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
-import { window } from "./window";
-
-// The libdeno functions are moved so that users can't access them.
-type MessageCallback = (msg: Uint8Array) => void;
 
 interface EvalErrorInfo {
   // Is the object thrown a native Error?
@@ -16,7 +12,11 @@ interface EvalErrorInfo {
   thrown: any;
 }
 
-interface Libdeno {
+declare interface MessageCallback {
+  (msg: Uint8Array): void;
+}
+
+declare interface DenoCore {
   recv(cb: MessageCallback): void;
 
   send(
@@ -38,5 +38,3 @@ interface Libdeno {
 
   errorToJSON: (e: Error) => string;
 }
-
-export const libdeno = window.libdeno as Libdeno;
diff --git a/libdeno/libdeno_test.cc b/libdeno/libdeno_test.cc
index 90fceef73..8949e7f4a 100644
--- a/libdeno/libdeno_test.cc
+++ b/libdeno/libdeno_test.cc
@@ -320,7 +320,7 @@ TEST(LibDenoTest, SharedAtomics) {
   deno_buf shared = {nullptr, 0, reinterpret_cast<uint8_t*>(s), sizeof s, 0};
   Deno* d = deno_new(deno_config{0, empty, shared, nullptr});
   deno_execute(d, nullptr, "a.js",
-               "Atomics.add(new Int32Array(libdeno.shared), 0, 1)");
+               "Atomics.add(new Int32Array(Deno.core.shared), 0, 1)");
   EXPECT_EQ(nullptr, deno_last_exception(d));
   EXPECT_EQ(s[0], 1);
   EXPECT_EQ(s[1], 1);
diff --git a/libdeno/libdeno_test.js b/libdeno/libdeno_test.js
index 8b1ad2e04..b0040025d 100644
--- a/libdeno/libdeno_test.js
+++ b/libdeno/libdeno_test.js
@@ -10,7 +10,7 @@ function assert(cond) {
 }
 
 global.CanCallFunction = () => {
-  libdeno.print("Hello world from foo");
+  Deno.core.print("Hello world from foo");
   return "foo";
 };
 
@@ -28,15 +28,15 @@ global.TypedArraySnapshots = () => {
 global.RecvReturnEmpty = () => {
   const m1 = new Uint8Array("abc".split("").map(c => c.charCodeAt(0)));
   const m2 = m1.slice();
-  const r1 = libdeno.send(m1);
+  const r1 = Deno.core.send(m1);
   assert(r1 == null);
-  const r2 = libdeno.send(m2);
+  const r2 = Deno.core.send(m2);
   assert(r2 == null);
 };
 
 global.RecvReturnBar = () => {
   const m = new Uint8Array("abc".split("").map(c => c.charCodeAt(0)));
-  const r = libdeno.send(m);
+  const r = Deno.core.send(m);
   assert(r instanceof Uint8Array);
   assert(r.byteLength === 3);
   const rstr = String.fromCharCode(...r);
@@ -44,10 +44,10 @@ global.RecvReturnBar = () => {
 };
 
 global.DoubleRecvFails = () => {
-  // libdeno.recv is an internal function and should only be called once from the
+  // Deno.core.recv is an internal function and should only be called once from the
   // runtime.
-  libdeno.recv((channel, msg) => assert(false));
-  libdeno.recv((channel, msg) => assert(false));
+  Deno.core.recv((channel, msg) => assert(false));
+  Deno.core.recv((channel, msg) => assert(false));
 };
 
 global.SendRecvSlice = () => {
@@ -58,7 +58,7 @@ global.SendRecvSlice = () => {
     buf[0] = 100 + i;
     buf[buf.length - 1] = 100 - i;
     // On the native side, the slice is shortened by 19 bytes.
-    buf = libdeno.send(buf);
+    buf = Deno.core.send(buf);
     assert(buf.byteOffset === i * 11);
     assert(buf.byteLength === abLen - i * 30 - 19);
     assert(buf.buffer.byteLength == abLen);
@@ -78,17 +78,17 @@ global.JSSendArrayBufferViewTypes = () => {
   const ab1 = new ArrayBuffer(4321);
   const u8 = new Uint8Array(ab1, 2468, 1000);
   u8[0] = 1;
-  libdeno.send(u8);
+  Deno.core.send(u8);
   // Send Uint32Array.
   const ab2 = new ArrayBuffer(4321);
   const u32 = new Uint32Array(ab2, 2468, 1000 / Uint32Array.BYTES_PER_ELEMENT);
   u32[0] = 0x02020202;
-  libdeno.send(u32);
+  Deno.core.send(u32);
   // Send DataView.
   const ab3 = new ArrayBuffer(4321);
   const dv = new DataView(ab3, 2468, 1000);
   dv.setUint8(0, 3);
-  libdeno.send(dv);
+  Deno.core.send(dv);
 };
 
 // The following join has caused SnapshotBug to segfault when using kKeep.
@@ -110,7 +110,7 @@ global.ZeroCopyBuf = () => {
   const b = zeroCopyBuf;
   // The second parameter of send should modified by the
   // privileged side.
-  const r = libdeno.send(a, b);
+  const r = Deno.core.send(a, b);
   assert(r == null);
   // b is different.
   assert(b[0] === 4);
@@ -129,15 +129,15 @@ global.CheckPromiseErrors = () => {
     try {
       await fn();
     } catch (e) {
-      libdeno.send(new Uint8Array([42]));
+      Deno.core.send(new Uint8Array([42]));
     }
   })();
 };
 
 global.Shared = () => {
-  const ab = libdeno.shared;
+  const ab = Deno.core.shared;
   assert(ab instanceof SharedArrayBuffer);
-  assert(libdeno.shared != undefined);
+  assert(Deno.core.shared != undefined);
   assert(ab.byteLength === 3);
   const ui8 = new Uint8Array(ab);
   assert(ui8[0] === 0);
@@ -149,45 +149,46 @@ global.Shared = () => {
 };
 
 global.LibDenoEvalContext = () => {
-  const [result, errInfo] = libdeno.evalContext("let a = 1; a");
+  const [result, errInfo] = Deno.core.evalContext("let a = 1; a");
   assert(result === 1);
   assert(!errInfo);
-  const [result2, errInfo2] = libdeno.evalContext("a = a + 1; a");
+  const [result2, errInfo2] = Deno.core.evalContext("a = a + 1; a");
   assert(result2 === 2);
   assert(!errInfo2);
 };
 
 global.LibDenoEvalContextError = () => {
-  const [result, errInfo] = libdeno.evalContext("not_a_variable");
+  const [result, errInfo] = Deno.core.evalContext("not_a_variable");
   assert(!result);
   assert(!!errInfo);
   assert(errInfo.isNativeError); // is a native error (ReferenceError)
   assert(!errInfo.isCompileError); // is NOT a compilation error
   assert(errInfo.thrown.message === "not_a_variable is not defined");
 
-  const [result2, errInfo2] = libdeno.evalContext("throw 1");
+  const [result2, errInfo2] = Deno.core.evalContext("throw 1");
   assert(!result2);
   assert(!!errInfo2);
   assert(!errInfo2.isNativeError); // is NOT a native error
   assert(!errInfo2.isCompileError); // is NOT a compilation error
   assert(errInfo2.thrown === 1);
 
-  const [result3, errInfo3] =
-  libdeno.evalContext("class AError extends Error {}; throw new AError('e')");
+  const [result3, errInfo3] = Deno.core.evalContext(
+    "class AError extends Error {}; throw new AError('e')"
+  );
   assert(!result3);
   assert(!!errInfo3);
   assert(errInfo3.isNativeError); // extend from native error, still native error
   assert(!errInfo3.isCompileError); // is NOT a compilation error
   assert(errInfo3.thrown.message === "e");
 
-  const [result4, errInfo4] = libdeno.evalContext("{");
+  const [result4, errInfo4] = Deno.core.evalContext("{");
   assert(!result4);
   assert(!!errInfo4);
   assert(errInfo4.isNativeError); // is a native error (SyntaxError)
   assert(errInfo4.isCompileError); // is a compilation error! (braces not closed)
   assert(errInfo4.thrown.message === "Unexpected end of input");
 
-  const [result5, errInfo5] = libdeno.evalContext("eval('{')");
+  const [result5, errInfo5] = Deno.core.evalContext("eval('{')");
   assert(!result5);
   assert(!!errInfo5);
   assert(errInfo5.isNativeError); // is a native error (SyntaxError)
diff --git a/libdeno/modules_test.cc b/libdeno/modules_test.cc
index 357c48641..9f9228430 100644
--- a/libdeno/modules_test.cc
+++ b/libdeno/modules_test.cc
@@ -19,7 +19,7 @@ TEST(ModulesTest, Resolution) {
   static deno_mod a = deno_mod_new(d, true, "a.js",
                                    "import { b } from 'b.js'\n"
                                    "if (b() != 'b') throw Error();\n"
-                                   "libdeno.send(new Uint8Array([4]));");
+                                   "Deno.core.send(new Uint8Array([4]));");
   EXPECT_NE(a, 0);
   EXPECT_EQ(nullptr, deno_last_exception(d));
 
@@ -71,7 +71,7 @@ TEST(ModulesTest, ResolutionError) {
 
   static deno_mod a = deno_mod_new(d, true, "a.js",
                                    "import 'bad'\n"
-                                   "libdeno.send(new Uint8Array([4]));");
+                                   "Deno.core.send(new Uint8Array([4]));");
   EXPECT_NE(a, 0);
   EXPECT_EQ(nullptr, deno_last_exception(d));
 
@@ -105,7 +105,7 @@ TEST(ModulesTest, ImportMetaUrl) {
   static deno_mod a =
       deno_mod_new(d, true, "a.js",
                    "if ('a.js' != import.meta.url) throw 'hmm'\n"
-                   "libdeno.send(new Uint8Array([4]));");
+                   "Deno.core.send(new Uint8Array([4]));");
   EXPECT_NE(a, 0);
   EXPECT_EQ(nullptr, deno_last_exception(d));
 
diff --git a/tsconfig.json b/tsconfig.json
index bece2b313..e79023de3 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -22,5 +22,11 @@
     "target": "esnext",
     "types": []
   },
-  "files": ["js/lib.web_assembly.d.ts", "js/main.ts", "js/compiler.ts"]
+  "files": [
+    "js/lib.web_assembly.d.ts",
+    "core/core.d.ts",
+    "libdeno/libdeno.d.ts",
+    "js/main.ts",
+    "js/compiler.ts"
+  ]
 }