diff --git a/cli/js/compiler.ts b/cli/js/compiler.ts
index 58194e35ba708f..b250c96813b4cd 100644
--- a/cli/js/compiler.ts
+++ b/cli/js/compiler.ts
@@ -717,14 +717,12 @@ function cache(
 
 function processConfigureResponse(
   configResult: ConfigureResponse,
-  configPath = ""
+  configPath: string
 ): ts.Diagnostic[] | undefined {
   const { ignoredOptions, diagnostics } = configResult;
   if (ignoredOptions) {
     console.warn(
-      (configPath
-        ? yellow(`Unsupported compiler options in "${configPath}"\n`)
-        : yellow("Unsupported compiler options.")) +
+      yellow(`Unsupported compiler options in "${configPath}"\n`) +
         cyan(`  The following options were ignored:\n`) +
         `    ${ignoredOptions.map((value): string => bold(value)).join(", ")}`
     );
@@ -990,16 +988,16 @@ self.compilerMain = function compilerMain(): void {
             }
             // we only support single root names for bundles
             assert(rootNames.length === 1);
-            const bundle = buildBundle(rootNames[0], data, sourceFiles);
+            const out = buildBundle(rootNames[0], data, sourceFiles);
             if (outFile) {
-              const encodedData = encoder.encode(bundle);
-              console.warn(`Emitting bundle to "${fileName}"`);
-              writeFileSync(fileName, encodedData);
+              const encodedData = encoder.encode(out);
+              console.warn(`Emitting bundle to "${outFile}"`);
+              writeFileSync(outFile, encodedData);
               console.warn(
                 `${util.humanFileSize(encodedData.length)} emitted.`
               );
             } else {
-              console.log(bundle);
+              console.log(out);
             }
           }
         };
@@ -1011,7 +1009,7 @@ self.compilerMain = function compilerMain(): void {
         // if there is a configuration supplied, we need to parse that
         if (config && config.length && configPath) {
           const configResult = host.configure(configPath, config);
-          diagnostics = processConfigureResponse(configResult);
+          diagnostics = processConfigureResponse(configResult, configPath);
         }
 
         let emitSkipped = true;
diff --git a/cli/js/compiler_api.ts b/cli/js/compiler_api.ts
index 9bc708bef07297..0a77b5db8bf4b0 100644
--- a/cli/js/compiler_api.ts
+++ b/cli/js/compiler_api.ts
@@ -1,5 +1,8 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 
+// This file contains the runtime APIs which will dispatch work to the internal
+// compiler within Deno.
+
 import { Diagnostic } from "./diagnostics.ts";
 import * as dispatch from "./dispatch.ts";
 import { sendAsync, sendSync } from "./dispatch_json.ts";
@@ -284,7 +287,7 @@ export function transpileOnly(
   sources: Record<string, string>,
   options?: CompilerOptions
 ): Promise<Record<string, TranspileOnlyResult>> {
-  util.log("Deno.transpileOnly");
+  util.log("Deno.transpileOnly", { sources: Object.keys(sources), options });
   const payload = {
     sources,
     options: options ? JSON.stringify(options) : undefined
@@ -315,7 +318,10 @@ export function transpileOnlySync(
   sources: Record<string, string>,
   options?: CompilerOptions
 ): Record<string, TranspileOnlyResult> {
-  util.log("Deno.transpileOnlySync");
+  util.log("Deno.transpileOnlySync", {
+    sources: Object.keys(sources),
+    options
+  });
   return sendSync(dispatch.OP_TRANSPILE, {
     sources,
     options: options ? JSON.stringify(options) : undefined
diff --git a/cli/js/compiler_api_test.ts b/cli/js/compiler_api_test.ts
index 1ec5dd33a6f7c1..64a1301830d1bd 100644
--- a/cli/js/compiler_api_test.ts
+++ b/cli/js/compiler_api_test.ts
@@ -1,10 +1,21 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+
 import { assert, assertEquals, test } from "./test_util.ts";
 
-const { compile, compileSync } = Deno;
+const {
+  compile
+  // compileSync,
+  // transpileOnly,
+  // transpileOnlySync,
+  // bundle,
+  // bundleSync
+} = Deno;
 
 test(async function compilerApiCompileSources() {
-  const result = await Deno.compile("/foo.ts", {
+  const [diagnostics, actual] = await compile("/foo.ts", {
     "/foo.ts": `console.log("foo");\nexport {}\n`
   });
+  assert(diagnostics == null);
+  assert(actual);
+  assertEquals(Object.keys(actual).length, 2);
 });
diff --git a/cli/tests/error_011_bad_module_specifier.ts.out b/cli/tests/error_011_bad_module_specifier.ts.out
index 276443e5bf64f3..5f1418c26a8d38 100644
--- a/cli/tests/error_011_bad_module_specifier.ts.out
+++ b/cli/tests/error_011_bad_module_specifier.ts.out
@@ -1,5 +1,8 @@
 [WILDCARD]error: Uncaught ImportPrefixMissing: relative import path "bad-module.ts" not prefixed with / or ./ or ../ Imported from "[WILDCARD]/error_011_bad_module_specifier.ts"
 [WILDCARD]dispatch_json.ts:[WILDCARD]
-    at DenoError ([WILDCARD]errors.ts:[WILDCARD])
-    at unwrapResponse ([WILDCARD]dispatch_json.ts:[WILDCARD])
-    at sendAsync[WILDCARD] ([WILDCARD]dispatch_json.ts:[WILDCARD])
+    at DenoError ($deno$/errors.ts:[WILDCARD])
+    at unwrapResponse ($deno$/dispatch_json.ts:[WILDCARD])
+    at sendSync ($deno$/dispatch_json.ts:[WILDCARD])
+    at resolveModules ($deno$/compiler.ts:[WILDCARD])
+    at processImports ($deno$/compiler.ts:[WILDCARD])
+    at processImports ($deno$/compiler.ts:[WILDCARD])
diff --git a/cli/tests/error_012_bad_dynamic_import_specifier.ts.out b/cli/tests/error_012_bad_dynamic_import_specifier.ts.out
index 52e5b913e48b8c..bdd08245128db9 100644
--- a/cli/tests/error_012_bad_dynamic_import_specifier.ts.out
+++ b/cli/tests/error_012_bad_dynamic_import_specifier.ts.out
@@ -1,5 +1,8 @@
 [WILDCARD]error: Uncaught ImportPrefixMissing: relative import path "bad-module.ts" not prefixed with / or ./ or ../ Imported from "[WILDCARD]/error_012_bad_dynamic_import_specifier.ts"
 [WILDCARD]dispatch_json.ts:[WILDCARD]
-    at DenoError ([WILDCARD]errors.ts:[WILDCARD])
-    at unwrapResponse ([WILDCARD]dispatch_json.ts:[WILDCARD])
-    at sendAsync[WILDCARD] ([WILDCARD]dispatch_json.ts:[WILDCARD])
+    at DenoError ($deno$/errors.ts:[WILDCARD])
+    at unwrapResponse ($deno$/dispatch_json.ts:[WILDCARD])
+    at sendSync ($deno$/dispatch_json.ts:[WILDCARD])
+    at resolveModules ($deno$/compiler.ts:[WILDCARD])
+    at processImports ($deno$/compiler.ts:[WILDCARD])
+    at processImports ($deno$/compiler.ts:[WILDCARD])
diff --git a/cli/tests/error_type_definitions.ts.out b/cli/tests/error_type_definitions.ts.out
index e21b6d7945273a..f613a7e2f66619 100644
--- a/cli/tests/error_type_definitions.ts.out
+++ b/cli/tests/error_type_definitions.ts.out
@@ -1,5 +1,8 @@
 [WILDCARD]error: Uncaught ImportPrefixMissing: relative import path "baz" not prefixed with / or ./ or ../ Imported from "[WILDCARD]/type_definitions/bar.d.ts"
 [WILDCARD]dispatch_json.ts:[WILDCARD]
-    at DenoError ([WILDCARD]errors.ts:[WILDCARD])
-    at unwrapResponse ([WILDCARD]dispatch_json.ts:[WILDCARD])
-    at sendAsync[WILDCARD] ([WILDCARD]dispatch_json.ts:[WILDCARD])
+    at DenoError ($deno$/errors.ts:[WILDCARD])
+    at unwrapResponse ($deno$/dispatch_json.ts:[WILDCARD])
+    at sendSync ($deno$/dispatch_json.ts:[WILDCARD])
+    at resolveModules ($deno$/compiler.ts:[WILDCARD])
+    at processImports ($deno$/compiler.ts:[WILDCARD])
+    at processImports ($deno$/compiler.ts:[WILDCARD])