3 files changed, 7 insertions, 6 deletions
diff --git a/cli/js/compiler.ts b/cli/js/compiler.ts
index 76a0f7262..c0f9c0a1e 100644
--- a/cli/js/compiler.ts
+++ b/cli/js/compiler.ts
@@ -240,9 +240,10 @@ self.compilerMain = function compilerMain(): void {
           emitResult.emitSkipped === false,
           "Unexpected skip of the emit."
         );
-        const { items } = fromTypeScriptDiagnostic(diagnostics);
         const result = [
-          items && items.length ? items : undefined,
+          diagnostics.length
+            ? fromTypeScriptDiagnostic(diagnostics)
+            : undefined,
           bundle ? state.emitBundle : state.emitMap
         ];
         postMessage(result);
diff --git a/cli/js/compiler_api.ts b/cli/js/compiler_api.ts
index 077d19bdd..487807d66 100644
--- a/cli/js/compiler_api.ts
+++ b/cli/js/compiler_api.ts
@@ -328,7 +328,7 @@ export function compile(
   rootName: string,
   sources?: Record<string, string>,
   options?: CompilerOptions
-): Promise<[Diagnostic[] | undefined, Record<string, string>]> {
+): Promise<[Diagnostic | undefined, Record<string, string>]> {
   const payload = {
     rootName: sources ? rootName : checkRelative(rootName),
     sources,
@@ -377,7 +377,7 @@ export function bundle(
   rootName: string,
   sources?: Record<string, string>,
   options?: CompilerOptions
-): Promise<[Diagnostic[] | undefined, string]> {
+): Promise<[Diagnostic | undefined, string]> {
   const payload = {
     rootName: sources ? rootName : checkRelative(rootName),
     sources,
diff --git a/cli/js/lib.deno_runtime.d.ts b/cli/js/lib.deno_runtime.d.ts
index d45ad2540..8740af062 100644
--- a/cli/js/lib.deno_runtime.d.ts
+++ b/cli/js/lib.deno_runtime.d.ts
@@ -1904,7 +1904,7 @@ declare namespace Deno {
     rootName: string,
     sources?: Record<string, string>,
     options?: CompilerOptions
-  ): Promise<[Diagnostic[] | undefined, Record<string, string>]>;
+  ): Promise<[Diagnostic | undefined, Record<string, string>]>;
 
   /** Takes a root module name, and optionally a record set of sources. Resolves
    * with a single JavaScript string that is like the output of a `deno bundle`
@@ -1938,7 +1938,7 @@ declare namespace Deno {
     rootName: string,
     sources?: Record<string, string>,
     options?: CompilerOptions
-  ): Promise<[Diagnostic[] | undefined, string]>;
+  ): Promise<[Diagnostic | undefined, string]>;
 
   // @url js/deno.d.ts