diff --git a/cli/tests/020_json_modules.ts.out b/cli/tests/020_json_modules.ts.out
index 6e933ef993..54db523a01 100644
--- a/cli/tests/020_json_modules.ts.out
+++ b/cli/tests/020_json_modules.ts.out
@@ -1,9 +1,3 @@
 [WILDCARD]
 error: Uncaught TypeError: Cannot resolve extension for "[WILDCARD]config.json" with mediaType "Json".
-    at getExtension ([WILDCARD]99_main_compiler.js:[WILDCARD])
-    at new SourceFile ([WILDCARD]99_main_compiler.js:[WILDCARD])
-    at Function.addToCache ([WILDCARD]99_main_compiler.js:[WILDCARD])
-    at buildSourceFileCache ([WILDCARD]99_main_compiler.js:[WILDCARD])
-    at compile ([WILDCARD]99_main_compiler.js:[WILDCARD])
-    at tsCompilerOnMessage ([WILDCARD]99_main_compiler.js:[WILDCARD])
 [WILDCARD]
\ No newline at end of file
diff --git a/cli/tsc/06_util.js b/cli/tsc/06_util.js
deleted file mode 100644
index b6a582f9e4..0000000000
--- a/cli/tsc/06_util.js
+++ /dev/null
@@ -1,59 +0,0 @@
-// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
-
-((window) => {
-  const core = Deno.core;
-  let logDebug = false;
-  let logSource = "JS";
-
-  function setLogDebug(debug, source) {
-    logDebug = debug;
-    if (source) {
-      logSource = source;
-    }
-  }
-
-  function log(...args) {
-    if (logDebug) {
-      const stringifiedArgs = args.map(JSON.stringify).join(" ");
-      core.print(`DEBUG ${logSource} - ${stringifiedArgs}\n`);
-    }
-  }
-
-  class AssertionError extends Error {
-    constructor(msg) {
-      super(msg);
-      this.name = "AssertionError";
-    }
-  }
-
-  function assert(cond, msg = "Assertion failed.") {
-    if (!cond) {
-      throw new AssertionError(msg);
-    }
-  }
-
-  function createResolvable() {
-    let resolve;
-    let reject;
-    const promise = new Promise((res, rej) => {
-      resolve = res;
-      reject = rej;
-    });
-    promise.resolve = resolve;
-    promise.reject = reject;
-    return promise;
-  }
-
-  function notImplemented() {
-    throw new Error("not implemented");
-  }
-
-  window.__bootstrap.util = {
-    log,
-    setLogDebug,
-    notImplemented,
-    createResolvable,
-    assert,
-    AssertionError,
-  };
-})(this);
diff --git a/cli/tsc/40_error_stack.js b/cli/tsc/40_error_stack.js
deleted file mode 100644
index 7a91a15c8e..0000000000
--- a/cli/tsc/40_error_stack.js
+++ /dev/null
@@ -1,224 +0,0 @@
-// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
-
-((window) => {
-  // Some of the code here is adapted directly from V8 and licensed under a BSD
-  // style license available here: https://github.com/v8/v8/blob/24886f2d1c565287d33d71e4109a53bf0b54b75c/LICENSE.v8
-  const assert = window.__bootstrap.util.assert;
-
-  function patchCallSite(callSite, location) {
-    return {
-      getThis() {
-        return callSite.getThis();
-      },
-      getTypeName() {
-        return callSite.getTypeName();
-      },
-      getFunction() {
-        return callSite.getFunction();
-      },
-      getFunctionName() {
-        return callSite.getFunctionName();
-      },
-      getMethodName() {
-        return callSite.getMethodName();
-      },
-      getFileName() {
-        return location.fileName;
-      },
-      getLineNumber() {
-        return location.lineNumber;
-      },
-      getColumnNumber() {
-        return location.columnNumber;
-      },
-      getEvalOrigin() {
-        return callSite.getEvalOrigin();
-      },
-      isToplevel() {
-        return callSite.isToplevel();
-      },
-      isEval() {
-        return callSite.isEval();
-      },
-      isNative() {
-        return callSite.isNative();
-      },
-      isConstructor() {
-        return callSite.isConstructor();
-      },
-      isAsync() {
-        return callSite.isAsync();
-      },
-      isPromiseAll() {
-        return callSite.isPromiseAll();
-      },
-      getPromiseIndex() {
-        return callSite.getPromiseIndex();
-      },
-    };
-  }
-
-  // Keep in sync with `cli/fmt_errors.rs`.
-  function formatLocation(callSite) {
-    if (callSite.isNative()) {
-      return "native";
-    }
-
-    let result = "";
-
-    const fileName = callSite.getFileName();
-
-    if (fileName) {
-      result += fileName;
-    } else {
-      if (callSite.isEval()) {
-        const evalOrigin = callSite.getEvalOrigin();
-        assert(evalOrigin != null);
-        result += `${evalOrigin}, `;
-      }
-      result += "<anonymous>";
-    }
-
-    const lineNumber = callSite.getLineNumber();
-    if (lineNumber != null) {
-      result += `:${lineNumber}`;
-
-      const columnNumber = callSite.getColumnNumber();
-      if (columnNumber != null) {
-        result += `:${columnNumber}`;
-      }
-    }
-
-    return result;
-  }
-
-  // Keep in sync with `cli/fmt_errors.rs`.
-  function formatCallSite(callSite) {
-    let result = "";
-    const functionName = callSite.getFunctionName();
-
-    const isTopLevel = callSite.isToplevel();
-    const isAsync = callSite.isAsync();
-    const isPromiseAll = callSite.isPromiseAll();
-    const isConstructor = callSite.isConstructor();
-    const isMethodCall = !(isTopLevel || isConstructor);
-
-    if (isAsync) {
-      result += "async ";
-    }
-    if (isPromiseAll) {
-      result += `Promise.all (index ${callSite.getPromiseIndex()})`;
-      return result;
-    }
-    if (isMethodCall) {
-      const typeName = callSite.getTypeName();
-      const methodName = callSite.getMethodName();
-
-      if (functionName) {
-        if (typeName) {
-          if (!functionName.startsWith(typeName)) {
-            result += `${typeName}.`;
-          }
-        }
-        result += functionName;
-        if (methodName) {
-          if (!functionName.endsWith(methodName)) {
-            result += ` [as ${methodName}]`;
-          }
-        }
-      } else {
-        if (typeName) {
-          result += `${typeName}.`;
-        }
-        if (methodName) {
-          result += methodName;
-        } else {
-          result += "<anonymous>";
-        }
-      }
-    } else if (isConstructor) {
-      result += "new ";
-      if (functionName) {
-        result += functionName;
-      } else {
-        result += "<anonymous>";
-      }
-    } else if (functionName) {
-      result += functionName;
-    } else {
-      result += formatLocation(callSite);
-      return result;
-    }
-
-    result += ` (${formatLocation(callSite)})`;
-    return result;
-  }
-
-  function evaluateCallSite(callSite) {
-    return {
-      this: callSite.getThis(),
-      typeName: callSite.getTypeName(),
-      function: callSite.getFunction(),
-      functionName: callSite.getFunctionName(),
-      methodName: callSite.getMethodName(),
-      fileName: callSite.getFileName(),
-      lineNumber: callSite.getLineNumber(),
-      columnNumber: callSite.getColumnNumber(),
-      evalOrigin: callSite.getEvalOrigin(),
-      isToplevel: callSite.isToplevel(),
-      isEval: callSite.isEval(),
-      isNative: callSite.isNative(),
-      isConstructor: callSite.isConstructor(),
-      isAsync: callSite.isAsync(),
-      isPromiseAll: callSite.isPromiseAll(),
-      promiseIndex: callSite.getPromiseIndex(),
-    };
-  }
-
-  function prepareStackTrace(
-    error,
-    callSites,
-  ) {
-    const mappedCallSites = callSites.map(
-      (callSite) => {
-        const fileName = callSite.getFileName();
-        const lineNumber = callSite.getLineNumber();
-        const columnNumber = callSite.getColumnNumber();
-        if (fileName && lineNumber != null && columnNumber != null) {
-          return patchCallSite(
-            callSite,
-            {
-              fileName,
-              lineNumber,
-              columnNumber,
-            },
-          );
-        }
-        return callSite;
-      },
-    );
-    Object.defineProperties(error, {
-      __callSiteEvals: { value: [], configurable: true },
-    });
-    const formattedCallSites = [];
-    for (const callSite of mappedCallSites) {
-      error.__callSiteEvals.push(Object.freeze(evaluateCallSite(callSite)));
-      formattedCallSites.push(formatCallSite(callSite));
-    }
-    Object.freeze(error.__callSiteEvals);
-    return (
-      `${error.name}: ${error.message}\n` +
-      formattedCallSites
-        .map((s) => `    at ${s}`)
-        .join("\n")
-    );
-  }
-
-  function setPrepareStackTrace(ErrorConstructor) {
-    ErrorConstructor.prepareStackTrace = prepareStackTrace;
-  }
-
-  window.__bootstrap.errorStack = {
-    setPrepareStackTrace,
-  };
-})(this);
diff --git a/cli/tsc/99_main_compiler.js b/cli/tsc/99_main_compiler.js
index 94a08e6aba..d06912b1f4 100644
--- a/cli/tsc/99_main_compiler.js
+++ b/cli/tsc/99_main_compiler.js
@@ -18,11 +18,42 @@ delete Object.prototype.__proto__;
 
 ((window) => {
   const core = window.Deno.core;
-  const { assert, log, notImplemented } = window.__bootstrap.util;
-  const util = window.__bootstrap.util;
-  const errorStack = window.__bootstrap.errorStack;
   const errors = window.__bootstrap.errors.errors;
 
+  let logDebug = false;
+  let logSource = "JS";
+
+  function setLogDebug(debug, source) {
+    logDebug = debug;
+    if (source) {
+      logSource = source;
+    }
+  }
+
+  function log(...args) {
+    if (logDebug) {
+      const stringifiedArgs = args.map(JSON.stringify).join(" ");
+      core.print(`DEBUG ${logSource} - ${stringifiedArgs}\n`);
+    }
+  }
+
+  class AssertionError extends Error {
+    constructor(msg) {
+      super(msg);
+      this.name = "AssertionError";
+    }
+  }
+
+  function assert(cond, msg = "Assertion failed.") {
+    if (!cond) {
+      throw new AssertionError(msg);
+    }
+  }
+
+  function notImplemented() {
+    throw new Error("not implemented");
+  }
+
   /**
    * @param {import("../dts/typescript").DiagnosticRelatedInformation} diagnostic
    */
@@ -1303,8 +1334,7 @@ delete Object.prototype.__proto__;
     // are ready. The response should be a `StartRes` message containing the CLI
     // args and other info.
     const s = core.jsonOpSync("op_start");
-    util.setLogDebug(s.debugFlag, source);
-    errorStack.setPrepareStackTrace(Error);
+    setLogDebug(s.debugFlag, source);
     return s;
   }