2 files changed, 23 insertions, 3 deletions
diff --git a/js/console.ts b/js/console.ts
index 2eb5e27c0..c49a7621d 100644
--- a/js/console.ts
+++ b/js/console.ts
@@ -13,7 +13,7 @@ function getClassInstanceName(instance: any): string {
 }
 
 // tslint:disable-next-line:no-any
-function stringify(ctx: ConsoleContext, value: any): string {
+export function stringify(ctx: ConsoleContext, value: any): string {
   switch (typeof value) {
     case "string":
       return value;
@@ -42,7 +42,7 @@ function stringify(ctx: ConsoleContext, value: any): string {
 
       if (Array.isArray(value)) {
         for (const el of value) {
-          entries.push(stringify(ctx, el));
+          entries.push(stringifyWithQuotes(ctx, el));
         }
 
         ctx.delete(value);
@@ -61,7 +61,7 @@ function stringify(ctx: ConsoleContext, value: any): string {
         }
 
         for (const key of Object.keys(value)) {
-          entries.push(`${key}: ${stringify(ctx, value[key])}`);
+          entries.push(`${key}: ${stringifyWithQuotes(ctx, value[key])}`);
         }
 
         ctx.delete(value);
@@ -83,6 +83,17 @@ function stringify(ctx: ConsoleContext, value: any): string {
   }
 }
 
+// Print strings when they are inside of arrays or objects with quotes
+// tslint:disable-next-line:no-any
+function stringifyWithQuotes(ctx: ConsoleContext, value: any): string {
+  switch (typeof value) {
+    case "string":
+      return `"${value}"`;
+    default:
+      return stringify(ctx, value);
+  }
+}
+
 // tslint:disable-next-line:no-any
 function stringifyArgs(args: any[]): string {
   const out: string[] = [];
diff --git a/js/unit_tests.ts b/js/unit_tests.ts
index 6eebf8860..48b7e6bb3 100644
--- a/js/unit_tests.ts
+++ b/js/unit_tests.ts
@@ -5,6 +5,7 @@
 
 import { test, assert, assertEqual } from "./testing/testing.ts";
 import { readFileSync } from "deno";
+import { stringify } from "./console.ts";
 import * as deno from "deno";
 
 import "./compiler_test.ts";
@@ -25,6 +26,14 @@ test(function tests_console_assert() {
   assertEqual(hasThrown, true);
 });
 
+test(function tests_console_stringify_complex_objects() {
+  // tslint:disable:no-any
+  assertEqual("foo", stringify(new Set<any>(), "foo"));
+  assertEqual(`[ "foo", "bar" ]`, stringify(new Set<any>(), ["foo", "bar"]));
+  assertEqual(`{ foo: "bar" }`, stringify(new Set<any>(), { foo: "bar" }));
+  // tslint:enable:no-any
+});
+
 test(function tests_console_stringify_circular() {
   class Base {
     a = 1;