Split out compiler snapshot (#1566)

Speeds up startup time, reduces runtime heap size.

1 files changed, 17 insertions, 66 deletions

diff --git a/js/main.ts b/js/main.ts
index 024de9159..b26cefcbf 100644
--- a/js/main.ts
+++ b/js/main.ts
@@ -1,90 +1,41 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
-import { window } from "./globals";
+// tslint:disable-next-line:no-reference
+/// <reference path="./plugins.d.ts" />
 
-import * as flatbuffers from "./flatbuffers";
-import * as msg from "gen/msg_generated";
-import { assert, log, setLogDebug } from "./util";
+import "./globals";
+
+import { log } from "./util";
 import * as os from "./os";
-import { Compiler } from "./compiler";
 import { libdeno } from "./libdeno";
 import { args } from "./deno";
-import { sendSync, handleAsyncMsgFromRust } from "./dispatch";
 import { replLoop } from "./repl";
-import { version } from "typescript";
-import { postMessage } from "./workers";
-import { TextDecoder, TextEncoder } from "./text_encoding";
-import { ModuleSpecifier, ContainingFile } from "./compiler";
 
 // builtin modules
 import * as deno from "./deno";
 
-type CompilerLookup = { specifier: ModuleSpecifier; referrer: ContainingFile };
-
-// Global reference to StartRes so it can be shared between compilerMain and
-// denoMain.
-let startResMsg: msg.StartRes;
-
-function sendStart(): void {
-  const builder = flatbuffers.createBuilder();
-  msg.Start.startStart(builder);
-  const startOffset = msg.Start.endStart(builder);
-  const baseRes = sendSync(builder, msg.Any.Start, startOffset);
-  assert(baseRes != null);
-  assert(msg.Any.StartRes === baseRes!.innerType());
-  startResMsg = new msg.StartRes();
-  assert(baseRes!.inner(startResMsg) != null);
-}
-
-function compilerMain() {
-  // workerMain should have already been called since a compiler is a worker.
-  const compiler = Compiler.instance();
-  const encoder = new TextEncoder();
-  const decoder = new TextDecoder();
-  compiler.recompile = startResMsg.recompileFlag();
-  log(`recompile ${compiler.recompile}`);
-  window.onmessage = ({ data }: { data: Uint8Array }) => {
-    const json = decoder.decode(data);
-    const lookup = JSON.parse(json) as CompilerLookup;
-
-    const moduleMetaData = compiler.compile(lookup.specifier, lookup.referrer);
-
-    const responseJson = JSON.stringify(moduleMetaData);
-    const response = encoder.encode(responseJson);
-    postMessage(response);
-  };
-}
-window["compilerMain"] = compilerMain;
+// TODO(kitsonk) remove with `--types` below
+import libDts from "gen/lib/lib.deno_runtime.d.ts!string";
 
 /* tslint:disable-next-line:no-default-export */
 export default function denoMain() {
-  libdeno.recv(handleAsyncMsgFromRust);
+  const startResMsg = os.start();
 
   libdeno.builtinModules["deno"] = deno;
-  // libdeno.builtinModules["typescript"] = typescript;
   Object.freeze(libdeno.builtinModules);
 
-  // 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
-  // args and other info.
-  sendStart();
-
-  setLogDebug(startResMsg.debugFlag());
-
-  // handle `--types`
-  // TODO(kitsonk) move to Rust fetching from compiler
-  if (startResMsg.typesFlag()) {
-    const compiler = Compiler.instance();
-    const defaultLibFileName = compiler.getDefaultLibFileName();
-    const defaultLibModule = compiler.resolveModule(defaultLibFileName, "");
-    console.log(defaultLibModule.sourceCode);
-    os.exit(0);
-  }
-
   // handle `--version`
   if (startResMsg.versionFlag()) {
     console.log("deno:", startResMsg.denoVersion());
     console.log("v8:", startResMsg.v8Version());
-    console.log("typescript:", version);
+    // TODO figure out a way to restore functionality
+    // console.log("typescript:", version);
+    os.exit(0);
+  }
+
+  // handle `--types`
+  // TODO(kitsonk) move to Rust fetching from compiler
+  if (startResMsg.typesFlag()) {
+    console.log(libDts);
     os.exit(0);
   }