Improve new TextDecoder().toString() (#2032)

2 files changed, 14 insertions, 0 deletions

diff --git a/js/text_encoding.ts b/js/text_encoding.ts
index 364a0f020..a9d0d74b1 100644
--- a/js/text_encoding.ts
+++ b/js/text_encoding.ts
@@ -442,6 +442,9 @@ export class TextDecoder {
 
     return codePointsToString(output);
   }
+  get [Symbol.toStringTag]() {
+    return "TextDecoder";
+  }
 }
 
 export class TextEncoder {
@@ -467,4 +470,7 @@ export class TextEncoder {
 
     return new Uint8Array(output);
   }
+  get [Symbol.toStringTag]() {
+    return "TextEncoder";
+  }
 }
diff --git a/js/text_encoding_test.ts b/js/text_encoding_test.ts
index 0799b1c3e..d33537b4f 100644
--- a/js/text_encoding_test.ts
+++ b/js/text_encoding_test.ts
@@ -91,3 +91,11 @@ test(function textDecoderSharedInt32Array() {
   const actual = decoder.decode(i32);
   assertEquals(actual, "ABCDEFGH");
 });
+
+test(function toStringShouldBeWebCompatibility() {
+  const encoder = new TextEncoder();
+  assertEquals(encoder.toString(), "[object TextEncoder]");
+
+  const decoder = new TextDecoder();
+  assertEquals(decoder.toString(), "[object TextDecoder]");
+});