diff --git a/.gitignore b/.gitignore
index 2ebbb4eac2..51eb81ca8b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,6 +6,7 @@ Cargo.lock
 yarn.lock
 # npm deps
 node_modules
+.idea
 
 # RLS generated files
 /target/
diff --git a/js/assets.ts b/js/assets.ts
index 3b5691bc70..89b3e2645d 100644
--- a/js/assets.ts
+++ b/js/assets.ts
@@ -10,6 +10,7 @@
 import compilerDts from "gen/js/compiler.d.ts!string";
 import consoleDts from "gen/js/console.d.ts!string";
 import denoDts from "gen/js/deno.d.ts!string";
+import libdenoDts from "gen/js/libdeno.d.ts!string";
 import globalsDts from "gen/js/globals.d.ts!string";
 import osDts from "gen/js/os.d.ts!string";
 import fetchDts from "gen/js/fetch.d.ts!string";
@@ -59,6 +60,7 @@ export const assetSourceCode: { [key: string]: string } = {
   "compiler.d.ts": compilerDts,
   "console.d.ts": consoleDts,
   "deno.d.ts": denoDts,
+  "libdeno.d.ts": libdenoDts,
   "globals.d.ts": globalsDts,
   "os.d.ts": osDts,
   "fetch.d.ts": fetchDts,
diff --git a/js/compiler.ts b/js/compiler.ts
index 93cfd34c19..46f8c81215 100644
--- a/js/compiler.ts
+++ b/js/compiler.ts
@@ -2,7 +2,9 @@
 import * as ts from "typescript";
 import { assetSourceCode } from "./assets";
 import * as deno from "./deno";
-import { libdeno, window, globalEval } from "./globals";
+import { globalEval } from "./global-eval";
+import { libdeno } from "./libdeno";
+import { window } from "./globals";
 import * as os from "./os";
 import { RawSourceMap } from "./types";
 import { assert, log, notImplemented } from "./util";
diff --git a/js/deno.ts b/js/deno.ts
index ff9939b1b7..f7f6c521ee 100644
--- a/js/deno.ts
+++ b/js/deno.ts
@@ -1,4 +1,4 @@
 // Copyright 2018 the Deno authors. All rights reserved. MIT license.
 // Public deno module.
 export { exit, readFileSync, writeFileSync } from "./os";
-export { libdeno } from "./globals";
+export { libdeno } from "./libdeno";
diff --git a/js/fetch.ts b/js/fetch.ts
index e6981df377..1c733e0669 100644
--- a/js/fetch.ts
+++ b/js/fetch.ts
@@ -8,7 +8,7 @@ import {
   notImplemented
 } from "./util";
 import { flatbuffers } from "flatbuffers";
-import { libdeno } from "./globals";
+import { libdeno } from "./libdeno";
 import { deno as fbs } from "gen/msg_generated";
 import {
   Headers,
diff --git a/js/global-eval.ts b/js/global-eval.ts
new file mode 100644
index 0000000000..ee37e6f249
--- /dev/null
+++ b/js/global-eval.ts
@@ -0,0 +1,6 @@
+// If you use the eval function indirectly, by invoking it via a reference
+// other than eval, as of ECMAScript 5 it works in the global scope rather than
+// the local scope. This means, for instance, that function declarations create
+// global functions, and that the code being evaluated doesn't have access to
+// local variables within the scope where it's being called.
+export const globalEval = eval;
diff --git a/js/globals.ts b/js/globals.ts
index beecbf58db..80e00ea15f 100644
--- a/js/globals.ts
+++ b/js/globals.ts
@@ -2,10 +2,11 @@
 
 import { Console } from "./console";
 import { exit } from "./os";
-import { RawSourceMap } from "./types";
 import * as timers from "./timers";
-import { TextEncoder, TextDecoder } from "./text_encoding";
+import { TextDecoder, TextEncoder } from "./text_encoding";
 import * as fetch_ from "./fetch";
+import { libdeno } from "./libdeno";
+import { globalEval } from "./global-eval";
 
 declare global {
   interface Window {
@@ -36,27 +37,10 @@ declare global {
   // tslint:enable:variable-name
 }
 
-// If you use the eval function indirectly, by invoking it via a reference
-// other than eval, as of ECMAScript 5 it works in the global scope rather than
-// the local scope. This means, for instance, that function declarations create
-// global functions, and that the code being evaluated doesn't have access to
-// local variables within the scope where it's being called.
-export const globalEval = eval;
-
 // A reference to the global object.
 export const window = globalEval("this");
 window.window = window;
 
-// The libdeno functions are moved so that users can't access them.
-type MessageCallback = (msg: Uint8Array) => void;
-interface Libdeno {
-  recv(cb: MessageCallback): void;
-  send(msg: ArrayBufferView): null | Uint8Array;
-  print(x: string): void;
-  mainSource: string;
-  mainSourceMap: RawSourceMap;
-}
-export const libdeno = window.libdeno as Libdeno;
 window.libdeno = null;
 
 // import "./url";
diff --git a/js/libdeno.ts b/js/libdeno.ts
new file mode 100644
index 0000000000..83dc8efa09
--- /dev/null
+++ b/js/libdeno.ts
@@ -0,0 +1,18 @@
+import { RawSourceMap } from "./types";
+import { globalEval } from "./global-eval";
+
+// The libdeno functions are moved so that users can't access them.
+type MessageCallback = (msg: Uint8Array) => void;
+interface Libdeno {
+  recv(cb: MessageCallback): void;
+
+  send(msg: ArrayBufferView): null | Uint8Array;
+
+  print(x: string): void;
+
+  mainSource: string;
+  mainSourceMap: RawSourceMap;
+}
+
+const window = globalEval("this");
+export const libdeno = window.libdeno as Libdeno;
diff --git a/js/main.ts b/js/main.ts
index 7400030496..eb90abb0e3 100644
--- a/js/main.ts
+++ b/js/main.ts
@@ -4,7 +4,7 @@ import { deno as fbs } from "gen/msg_generated";
 import { assert, assignCmdId, log, setLogDebug } from "./util";
 import * as os from "./os";
 import { DenoCompiler } from "./compiler";
-import { libdeno } from "./globals";
+import { libdeno } from "./libdeno";
 import * as timers from "./timers";
 import { onFetchRes } from "./fetch";
 
diff --git a/js/os.ts b/js/os.ts
index 22bbd77489..3104c5013f 100644
--- a/js/os.ts
+++ b/js/os.ts
@@ -5,7 +5,7 @@ import { assert } from "./util";
 import * as util from "./util";
 import { maybeThrowError } from "./errors";
 import { flatbuffers } from "flatbuffers";
-import { libdeno } from "./globals";
+import { libdeno } from "./libdeno";
 
 export function exit(exitCode = 0): never {
   const builder = new flatbuffers.Builder();
diff --git a/js/timers.ts b/js/timers.ts
index 3791e079d4..43bd199b1a 100644
--- a/js/timers.ts
+++ b/js/timers.ts
@@ -3,7 +3,7 @@ import { assert } from "./util";
 import * as util from "./util";
 import { deno as fbs } from "gen/msg_generated";
 import { flatbuffers } from "flatbuffers";
-import { libdeno } from "./globals";
+import { libdeno } from "./libdeno";
 
 let nextTimerId = 1;
 
diff --git a/tslint.json b/tslint.json
index a169c3861d..78036ae388 100644
--- a/tslint.json
+++ b/tslint.json
@@ -63,5 +63,8 @@
       "allow-leading-underscore",
       "allow-trailing-underscore"
     ]
-  }
+  },
+  "extends": [
+    "tslint-no-circular-imports"
+  ]
 }