diff --git a/cli/js/deno.ts b/cli/js/deno.ts
index 4f56bb7d1d..2ecd7680c1 100644
--- a/cli/js/deno.ts
+++ b/cli/js/deno.ts
@@ -99,7 +99,7 @@ export {
 } from "./permissions.ts";
 export { openPlugin } from "./plugins.ts";
 export { kill } from "./ops/process.ts";
-export { run, RunOptions, Process, ProcessStatus, Signal } from "./process.ts";
+export { run, RunOptions, Process, ProcessStatus } from "./process.ts";
 export { readdirSync, readdir } from "./ops/fs/read_dir.ts";
 export { readFileSync, readFile } from "./read_file.ts";
 export { readlinkSync, readlink } from "./ops/fs/read_link.ts";
@@ -107,7 +107,7 @@ export { realpathSync, realpath } from "./ops/fs/realpath.ts";
 export { removeSync, remove, RemoveOptions } from "./ops/fs/remove.ts";
 export { renameSync, rename } from "./ops/fs/rename.ts";
 export { resources, close } from "./ops/resources.ts";
-export { signal, signals, SignalStream } from "./signals.ts";
+export { signal, signals, Signal, SignalStream } from "./signals.ts";
 export { statSync, lstatSync, stat, lstat } from "./ops/fs/stat.ts";
 export { symlinkSync, symlink } from "./ops/fs/symlink.ts";
 export { connectTLS, listenTLS } from "./tls.ts";
diff --git a/cli/js/dispatch.ts b/cli/js/dispatch.ts
deleted file mode 100644
index f3c92dbc68..0000000000
--- a/cli/js/dispatch.ts
+++ /dev/null
@@ -1,23 +0,0 @@
-// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
-import * as minimal from "./ops/dispatch_minimal.ts";
-import * as json from "./ops/dispatch_json.ts";
-import { AsyncHandler } from "./plugins.ts";
-
-const PLUGIN_ASYNC_HANDLER_MAP: Map<number, AsyncHandler> = new Map();
-
-export function setPluginAsyncHandler(
-  opId: number,
-  handler: AsyncHandler
-): void {
-  PLUGIN_ASYNC_HANDLER_MAP.set(opId, handler);
-}
-
-export function getAsyncHandler(opName: string): (msg: Uint8Array) => void {
-  switch (opName) {
-    case "op_write":
-    case "op_read":
-      return minimal.asyncMsgFromRust;
-    default:
-      return json.asyncMsgFromRust;
-  }
-}
diff --git a/cli/js/ops/os.ts b/cli/js/ops/os.ts
index 2d27f7ef55..5d30262837 100644
--- a/cli/js/ops/os.ts
+++ b/cli/js/ops/os.ts
@@ -1,7 +1,6 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 import { sendSync } from "./dispatch_json.ts";
 import { errors } from "../errors.ts";
-import * as util from "../util.ts";
 
 /** Get the loadavg.
  * Requires the `--allow-env` flag.
@@ -33,7 +32,7 @@ export function osRelease(): string {
 /** Exit the Deno process with optional exit code. */
 export function exit(code = 0): never {
   sendSync("op_exit", { code });
-  return util.unreachable();
+  throw new Error("Code not reachable");
 }
 
 function setEnv(key: string, value: string): void {
diff --git a/cli/js/process.ts b/cli/js/process.ts
index 6462086eef..7e17da5b66 100644
--- a/cli/js/process.ts
+++ b/cli/js/process.ts
@@ -3,7 +3,6 @@ import { File } from "./files.ts";
 import { close } from "./ops/resources.ts";
 import { ReadCloser, WriteCloser } from "./io.ts";
 import { readAll } from "./buffer.ts";
-import { build } from "./build.ts";
 import { kill, runStatus as runStatusOp, run as runOp } from "./ops/process.ts";
 
 /** How to handle subprocess stdio.
@@ -161,85 +160,3 @@ export function run({
   }) as RunResponse;
   return new Process(res);
 }
-
-// From `kill -l`
-enum LinuxSignal {
-  SIGHUP = 1,
-  SIGINT = 2,
-  SIGQUIT = 3,
-  SIGILL = 4,
-  SIGTRAP = 5,
-  SIGABRT = 6,
-  SIGBUS = 7,
-  SIGFPE = 8,
-  SIGKILL = 9,
-  SIGUSR1 = 10,
-  SIGSEGV = 11,
-  SIGUSR2 = 12,
-  SIGPIPE = 13,
-  SIGALRM = 14,
-  SIGTERM = 15,
-  SIGSTKFLT = 16,
-  SIGCHLD = 17,
-  SIGCONT = 18,
-  SIGSTOP = 19,
-  SIGTSTP = 20,
-  SIGTTIN = 21,
-  SIGTTOU = 22,
-  SIGURG = 23,
-  SIGXCPU = 24,
-  SIGXFSZ = 25,
-  SIGVTALRM = 26,
-  SIGPROF = 27,
-  SIGWINCH = 28,
-  SIGIO = 29,
-  SIGPWR = 30,
-  SIGSYS = 31
-}
-
-// From `kill -l`
-enum MacOSSignal {
-  SIGHUP = 1,
-  SIGINT = 2,
-  SIGQUIT = 3,
-  SIGILL = 4,
-  SIGTRAP = 5,
-  SIGABRT = 6,
-  SIGEMT = 7,
-  SIGFPE = 8,
-  SIGKILL = 9,
-  SIGBUS = 10,
-  SIGSEGV = 11,
-  SIGSYS = 12,
-  SIGPIPE = 13,
-  SIGALRM = 14,
-  SIGTERM = 15,
-  SIGURG = 16,
-  SIGSTOP = 17,
-  SIGTSTP = 18,
-  SIGCONT = 19,
-  SIGCHLD = 20,
-  SIGTTIN = 21,
-  SIGTTOU = 22,
-  SIGIO = 23,
-  SIGXCPU = 24,
-  SIGXFSZ = 25,
-  SIGVTALRM = 26,
-  SIGPROF = 27,
-  SIGWINCH = 28,
-  SIGINFO = 29,
-  SIGUSR1 = 30,
-  SIGUSR2 = 31
-}
-
-/** Signals numbers. This is platform dependent.
- */
-export const Signal: { [key: string]: number } = {};
-
-export function setSignals(): void {
-  if (build.os === "mac") {
-    Object.assign(Signal, MacOSSignal);
-  } else {
-    Object.assign(Signal, LinuxSignal);
-  }
-}
diff --git a/cli/js/runtime.ts b/cli/js/runtime.ts
index 9a304379fe..9d783dc7ac 100644
--- a/cli/js/runtime.ts
+++ b/cli/js/runtime.ts
@@ -1,6 +1,7 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 import { core } from "./core.ts";
-import * as dispatch from "./dispatch.ts";
+import * as dispatchMinimal from "./ops/dispatch_minimal.ts";
+import * as dispatchJson from "./ops/dispatch_json.ts";
 import { assert } from "./util.ts";
 import * as util from "./util.ts";
 import { setBuildInfo } from "./build.ts";
@@ -11,12 +12,22 @@ import { Start, start as startOp } from "./ops/runtime.ts";
 
 export let OPS_CACHE: { [name: string]: number };
 
+function getAsyncHandler(opName: string): (msg: Uint8Array) => void {
+  switch (opName) {
+    case "op_write":
+    case "op_read":
+      return dispatchMinimal.asyncMsgFromRust;
+    default:
+      return dispatchJson.asyncMsgFromRust;
+  }
+}
+
 // TODO(bartlomieju): temporary solution, must be fixed when moving
 // dispatches to separate crates
 export function initOps(): void {
   OPS_CACHE = core.ops();
   for (const [name, opId] of Object.entries(OPS_CACHE)) {
-    core.setAsyncHandler(opId, dispatch.getAsyncHandler(name));
+    core.setAsyncHandler(opId, getAsyncHandler(name));
   }
 }
 
diff --git a/cli/js/runtime_main.ts b/cli/js/runtime_main.ts
index 84ee43d370..40987f33d3 100644
--- a/cli/js/runtime_main.ts
+++ b/cli/js/runtime_main.ts
@@ -18,7 +18,7 @@ import {
   eventTargetProperties
 } from "./globals.ts";
 import { internalObject } from "./internals.ts";
-import { setSignals } from "./process.ts";
+import { setSignals } from "./signals.ts";
 import { replLoop } from "./repl.ts";
 import * as runtime from "./runtime.ts";
 import { symbols } from "./symbols.ts";
diff --git a/cli/js/signals.ts b/cli/js/signals.ts
index 2715cfa508..3295b9e806 100644
--- a/cli/js/signals.ts
+++ b/cli/js/signals.ts
@@ -1,8 +1,89 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
-import { Signal } from "./process.ts";
 import { bindSignal, pollSignal, unbindSignal } from "./ops/signal.ts";
 import { build } from "./build.ts";
 
+// From `kill -l`
+enum LinuxSignal {
+  SIGHUP = 1,
+  SIGINT = 2,
+  SIGQUIT = 3,
+  SIGILL = 4,
+  SIGTRAP = 5,
+  SIGABRT = 6,
+  SIGBUS = 7,
+  SIGFPE = 8,
+  SIGKILL = 9,
+  SIGUSR1 = 10,
+  SIGSEGV = 11,
+  SIGUSR2 = 12,
+  SIGPIPE = 13,
+  SIGALRM = 14,
+  SIGTERM = 15,
+  SIGSTKFLT = 16,
+  SIGCHLD = 17,
+  SIGCONT = 18,
+  SIGSTOP = 19,
+  SIGTSTP = 20,
+  SIGTTIN = 21,
+  SIGTTOU = 22,
+  SIGURG = 23,
+  SIGXCPU = 24,
+  SIGXFSZ = 25,
+  SIGVTALRM = 26,
+  SIGPROF = 27,
+  SIGWINCH = 28,
+  SIGIO = 29,
+  SIGPWR = 30,
+  SIGSYS = 31
+}
+
+// From `kill -l`
+enum MacOSSignal {
+  SIGHUP = 1,
+  SIGINT = 2,
+  SIGQUIT = 3,
+  SIGILL = 4,
+  SIGTRAP = 5,
+  SIGABRT = 6,
+  SIGEMT = 7,
+  SIGFPE = 8,
+  SIGKILL = 9,
+  SIGBUS = 10,
+  SIGSEGV = 11,
+  SIGSYS = 12,
+  SIGPIPE = 13,
+  SIGALRM = 14,
+  SIGTERM = 15,
+  SIGURG = 16,
+  SIGSTOP = 17,
+  SIGTSTP = 18,
+  SIGCONT = 19,
+  SIGCHLD = 20,
+  SIGTTIN = 21,
+  SIGTTOU = 22,
+  SIGIO = 23,
+  SIGXCPU = 24,
+  SIGXFSZ = 25,
+  SIGVTALRM = 26,
+  SIGPROF = 27,
+  SIGWINCH = 28,
+  SIGINFO = 29,
+  SIGUSR1 = 30,
+  SIGUSR2 = 31
+}
+
+/** Signals numbers. This is platform dependent.
+ */
+export const Signal: { [key: string]: number } = {};
+
+export function setSignals(): void {
+  if (build.os === "mac") {
+    Object.assign(Signal, MacOSSignal);
+  } else {
+    Object.assign(Signal, LinuxSignal);
+  }
+}
+
 /**
  * Returns the stream of the given signal number. You can use it as an async
  * iterator.
diff --git a/cli/js/types.ts b/cli/js/types.ts
deleted file mode 100644
index d139630905..0000000000
--- a/cli/js/types.ts
+++ /dev/null
@@ -1,2 +0,0 @@
-// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
-export type TypedArray = Uint8Array | Float32Array | Int32Array;
diff --git a/cli/js/util.ts b/cli/js/util.ts
index 9f03737210..3c67fa7f1b 100644
--- a/cli/js/util.ts
+++ b/cli/js/util.ts
@@ -1,5 +1,4 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
-import { TypedArray } from "./types.ts";
 
 let logDebug = false;
 let logSource = "JS";
@@ -80,30 +79,6 @@ export function notImplemented(): never {
   throw new Error("Not implemented");
 }
 
-// @internal
-export function unreachable(): never {
-  throw new Error("Code not reachable");
-}
-
-const TypedArrayConstructor = Object.getPrototypeOf(Uint8Array);
-export function isTypedArray(x: unknown): x is TypedArray {
-  return x instanceof TypedArrayConstructor;
-}
-
-// @internal
-export function requiredArguments(
-  name: string,
-  length: number,
-  required: number
-): void {
-  if (length < required) {
-    const errMsg = `${name} requires at least ${required} argument${
-      required === 1 ? "" : "s"
-    }, but only ${length} present`;
-    throw new TypeError(errMsg);
-  }
-}
-
 // @internal
 export function immutableDefine(
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
@@ -118,45 +93,3 @@ export function immutableDefine(
     writable: false
   });
 }
-
-// Returns values from a WeakMap to emulate private properties in JavaScript
-export function getPrivateValue<
-  K extends object,
-  V extends object,
-  W extends keyof V
->(instance: K, weakMap: WeakMap<K, V>, key: W): V[W] {
-  if (weakMap.has(instance)) {
-    return weakMap.get(instance)![key];
-  }
-  throw new TypeError("Illegal invocation");
-}
-
-/**
- * Determines whether an object has a property with the specified name.
- * Avoid calling prototype builtin `hasOwnProperty` for two reasons:
- *
- * 1. `hasOwnProperty` is defined on the object as something else:
- *
- *      const options = {
- *        ending: 'utf8',
- *        hasOwnProperty: 'foo'
- *      };
- *      options.hasOwnProperty('ending') // throws a TypeError
- *
- * 2. The object doesn't inherit from `Object.prototype`:
- *
- *       const options = Object.create(null);
- *       options.ending = 'utf8';
- *       options.hasOwnProperty('ending'); // throws a TypeError
- *
- * @param obj A Object.
- * @param v A property name.
- * @see https://eslint.org/docs/rules/no-prototype-builtins
- * @internal
- */
-export function hasOwnProperty<T>(obj: T, v: PropertyKey): boolean {
-  if (obj == null) {
-    return false;
-  }
-  return Object.prototype.hasOwnProperty.call(obj, v);
-}
diff --git a/cli/js/web/console.ts b/cli/js/web/console.ts
index 601d5fd094..8a34d62a1e 100644
--- a/cli/js/web/console.ts
+++ b/cli/js/web/console.ts
@@ -1,6 +1,5 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
-import { isTypedArray } from "../util.ts";
-import { TypedArray } from "../types.ts";
+import { isTypedArray, TypedArray } from "./util.ts";
 import { TextEncoder } from "./text_encoding.ts";
 import { File, stdout } from "../files.ts";
 import { cliTable } from "./console_table.ts";
diff --git a/cli/js/web/console_table.ts b/cli/js/web/console_table.ts
index 276d77f1d9..7e698f712f 100644
--- a/cli/js/web/console_table.ts
+++ b/cli/js/web/console_table.ts
@@ -2,7 +2,7 @@
 // Forked from Node's lib/internal/cli_table.js
 
 import { TextEncoder } from "./text_encoding.ts";
-import { hasOwnProperty } from "../util.ts";
+import { hasOwnProperty } from "./util.ts";
 
 const encoder = new TextEncoder();
 
diff --git a/cli/js/web/custom_event.ts b/cli/js/web/custom_event.ts
index 6c8a3c19b4..2d94df56de 100644
--- a/cli/js/web/custom_event.ts
+++ b/cli/js/web/custom_event.ts
@@ -1,7 +1,7 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 import * as domTypes from "./dom_types.ts";
 import * as event from "./event.ts";
-import { getPrivateValue, requiredArguments } from "../util.ts";
+import { getPrivateValue, requiredArguments } from "./util.ts";
 
 // WeakMaps are recommended for private attributes (see MDN link below)
 // https://developer.mozilla.org/en-US/docs/Archive/Add-ons/Add-on_SDK/Guides/Contributor_s_Guide/Private_Properties#Using_WeakMaps
diff --git a/cli/js/web/dom_iterable.ts b/cli/js/web/dom_iterable.ts
index bd8e7d8cde..f365d555f1 100644
--- a/cli/js/web/dom_iterable.ts
+++ b/cli/js/web/dom_iterable.ts
@@ -1,7 +1,7 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 // eslint-disable-next-line @typescript-eslint/no-unused-vars
 import { DomIterable } from "./dom_types.ts";
-import { requiredArguments } from "../util.ts";
+import { requiredArguments } from "./util.ts";
 import { exposeForTest } from "../internals.ts";
 
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
diff --git a/cli/js/web/event.ts b/cli/js/web/event.ts
index e365fb6b25..a30e334470 100644
--- a/cli/js/web/event.ts
+++ b/cli/js/web/event.ts
@@ -1,6 +1,6 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 import * as domTypes from "./dom_types.ts";
-import { getPrivateValue, requiredArguments } from "../util.ts";
+import { getPrivateValue, requiredArguments } from "./util.ts";
 
 // WeakMaps are recommended for private attributes (see MDN link below)
 // https://developer.mozilla.org/en-US/docs/Archive/Add-ons/Add-on_SDK/Guides/Contributor_s_Guide/Private_Properties#Using_WeakMaps
diff --git a/cli/js/web/event_target.ts b/cli/js/web/event_target.ts
index 09e80a7310..03557526a3 100644
--- a/cli/js/web/event_target.ts
+++ b/cli/js/web/event_target.ts
@@ -1,6 +1,6 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 import * as domTypes from "./dom_types.ts";
-import { hasOwnProperty, requiredArguments } from "../util.ts";
+import { hasOwnProperty, requiredArguments } from "./util.ts";
 import {
   getRoot,
   isNode,
diff --git a/cli/js/web/fetch.ts b/cli/js/web/fetch.ts
index d9918ba14a..daa926e516 100644
--- a/cli/js/web/fetch.ts
+++ b/cli/js/web/fetch.ts
@@ -1,10 +1,6 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
-import {
-  assert,
-  createResolvable,
-  notImplemented,
-  isTypedArray
-} from "../util.ts";
+import { assert, createResolvable, notImplemented } from "../util.ts";
+import { isTypedArray } from "./util.ts";
 import * as domTypes from "./dom_types.ts";
 import { TextDecoder, TextEncoder } from "./text_encoding.ts";
 import { DenoBlob, bytesSymbol as blobBytesSymbol } from "./blob.ts";
diff --git a/cli/js/web/form_data.ts b/cli/js/web/form_data.ts
index 9c0590c32d..461210b9d4 100644
--- a/cli/js/web/form_data.ts
+++ b/cli/js/web/form_data.ts
@@ -3,7 +3,7 @@ import * as domTypes from "./dom_types.ts";
 import * as blob from "./blob.ts";
 import * as domFile from "./dom_file.ts";
 import { DomIterableMixin } from "./dom_iterable.ts";
-import { requiredArguments } from "../util.ts";
+import { requiredArguments } from "./util.ts";
 
 const dataSymbol = Symbol("data");
 
diff --git a/cli/js/web/headers.ts b/cli/js/web/headers.ts
index 652dd2de63..9ff5942248 100644
--- a/cli/js/web/headers.ts
+++ b/cli/js/web/headers.ts
@@ -1,7 +1,7 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 import * as domTypes from "./dom_types.ts";
 import { DomIterableMixin } from "./dom_iterable.ts";
-import { requiredArguments } from "../util.ts";
+import { requiredArguments } from "./util.ts";
 import { customInspect } from "./console.ts";
 
 // From node-fetch
diff --git a/cli/js/web/url_search_params.ts b/cli/js/web/url_search_params.ts
index 2248a53883..ed93045da6 100644
--- a/cli/js/web/url_search_params.ts
+++ b/cli/js/web/url_search_params.ts
@@ -1,6 +1,6 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 import { URL } from "./url.ts";
-import { requiredArguments } from "../util.ts";
+import { requiredArguments } from "./util.ts";
 
 // Returns whether o is iterable.
 // @internal
diff --git a/cli/js/web/util.ts b/cli/js/web/util.ts
new file mode 100644
index 0000000000..b0a0509731
--- /dev/null
+++ b/cli/js/web/util.ts
@@ -0,0 +1,78 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+
+export type TypedArray = Uint8Array | Float32Array | Int32Array;
+const TypedArrayConstructor = Object.getPrototypeOf(Uint8Array);
+export function isTypedArray(x: unknown): x is TypedArray {
+  return x instanceof TypedArrayConstructor;
+}
+
+// @internal
+export function requiredArguments(
+  name: string,
+  length: number,
+  required: number
+): void {
+  if (length < required) {
+    const errMsg = `${name} requires at least ${required} argument${
+      required === 1 ? "" : "s"
+    }, but only ${length} present`;
+    throw new TypeError(errMsg);
+  }
+}
+
+// @internal
+export function immutableDefine(
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  o: any,
+  p: string | number | symbol,
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  value: any
+): void {
+  Object.defineProperty(o, p, {
+    value,
+    configurable: false,
+    writable: false
+  });
+}
+
+// Returns values from a WeakMap to emulate private properties in JavaScript
+export function getPrivateValue<
+  K extends object,
+  V extends object,
+  W extends keyof V
+>(instance: K, weakMap: WeakMap<K, V>, key: W): V[W] {
+  if (weakMap.has(instance)) {
+    return weakMap.get(instance)![key];
+  }
+  throw new TypeError("Illegal invocation");
+}
+
+/**
+ * Determines whether an object has a property with the specified name.
+ * Avoid calling prototype builtin `hasOwnProperty` for two reasons:
+ *
+ * 1. `hasOwnProperty` is defined on the object as something else:
+ *
+ *      const options = {
+ *        ending: 'utf8',
+ *        hasOwnProperty: 'foo'
+ *      };
+ *      options.hasOwnProperty('ending') // throws a TypeError
+ *
+ * 2. The object doesn't inherit from `Object.prototype`:
+ *
+ *       const options = Object.create(null);
+ *       options.ending = 'utf8';
+ *       options.hasOwnProperty('ending'); // throws a TypeError
+ *
+ * @param obj A Object.
+ * @param v A property name.
+ * @see https://eslint.org/docs/rules/no-prototype-builtins
+ * @internal
+ */
+export function hasOwnProperty<T>(obj: T, v: PropertyKey): boolean {
+  if (obj == null) {
+    return false;
+  }
+  return Object.prototype.hasOwnProperty.call(obj, v);
+}