diff --git a/addons/addon-image/src/IIPHandler.ts b/addons/addon-image/src/IIPHandler.ts
index 17ab4c4a..c0d28c00 100644
--- a/addons/addon-image/src/IIPHandler.ts
+++ b/addons/addon-image/src/IIPHandler.ts
@@ -5,14 +5,16 @@
 import { IImageAddonOptions, IOscHandler, IResetHandler, ITerminalExt } from './Types';
 import { ImageRenderer } from './ImageRenderer';
 import { ImageStorage, CELL_SIZE_DEFAULT } from './ImageStorage';
-import Base64Decoder from 'xterm-wasm-parts/lib/base64/Base64Decoder.wasm';
+import Base64Decoder, { type DecodeStatus } from 'xterm-wasm-parts/lib/base64/Base64Decoder.wasm';
 import { HeaderParser, IHeaderFields, HeaderState } from './IIPHeaderParser';
 import { imageType, UNSUPPORTED_TYPE } from './IIPMetrics';
 
 // limit hold memory in base64 decoder (encoded bytes)
 const KEEP_DATA = 4194304;
 const INITIAL_DATA = 1048576;
-const DECODER_SUCCESS = 0;
+
+// Local mirror of const enum (esbuild can't inline const enums from external packages)
+const DECODER_OK: DecodeStatus.OK = 0;
 
 // default IIP header values
 const DEFAULT_HEADER: IHeaderFields = {
@@ -56,7 +58,7 @@ export class IIPHandler implements IOscHandler, IResetHandler {
     if (this._aborted) return;
 
     if (this._hp.state === HeaderState.END) {
-      if (this._dec.put(data.subarray(start, end)) !== DECODER_SUCCESS) {
+      if (this._dec.put(data.subarray(start, end)) !== DECODER_OK) {
         this._dec.release();
         this._aborted = true;
       }
@@ -73,7 +75,7 @@ export class IIPHandler implements IOscHandler, IResetHandler {
           return;
         }
         this._dec.init();
-        if (this._dec.put(data.subarray(dataPos, end)) !== DECODER_SUCCESS) {
+        if (this._dec.put(data.subarray(dataPos, end)) !== DECODER_OK) {
           this._dec.release();
           this._aborted = true;
         }
diff --git a/addons/addon-image/src/kitty/KittyGraphicsHandler.ts b/addons/addon-image/src/kitty/KittyGraphicsHandler.ts
index 2c2c4baf..01bb84c6 100644
--- a/addons/addon-image/src/kitty/KittyGraphicsHandler.ts
+++ b/addons/addon-image/src/kitty/KittyGraphicsHandler.ts
@@ -6,7 +6,7 @@
 import { IApcHandler, IImageAddonOptions, IResetHandler, ITerminalExt } from '../Types';
 import { ImageRenderer } from '../ImageRenderer';
 import { ImageStorage, CELL_SIZE_DEFAULT } from '../ImageStorage';
-import Base64Decoder from 'xterm-wasm-parts/lib/base64/Base64Decoder.wasm';
+import Base64Decoder, { type DecodeStatus } from 'xterm-wasm-parts/lib/base64/Base64Decoder.wasm';
 import {
   KittyAction,
   KittyFormat,
@@ -23,7 +23,9 @@ import {
 // Memory limit for base64 decoder (4MB, same as IIPHandler)
 const DECODER_KEEP_DATA = 4194304;
 const DECODER_INITIAL_DATA = 4194304; // 4MB
-const DECODER_SUCCESS = 0;
+
+// Local mirror of const enum (esbuild can't inline const enums from external packages)
+const DECODER_OK: DecodeStatus.OK = 0;
 
 // Maximum control data size
 const MAX_CONTROL_DATA_SIZE = 512;
@@ -191,7 +193,7 @@ export class KittyGraphicsHandler implements IApcHandler, IResetHandler {
       this._activeDecoder.init();
     }
 
-    if (this._activeDecoder.put(data.subarray(start, end)) !== DECODER_SUCCESS) {
+    if (this._activeDecoder.put(data.subarray(start, end)) !== DECODER_OK) {
       this._activeDecoder.release();
       this._activeDecoder = null;
       this._decodeError = true;
@@ -258,7 +260,7 @@ export class KittyGraphicsHandler implements IApcHandler, IResetHandler {
 
     let imageBytes = new Uint8Array(0);
     if (decoder) {
-      if (decoder.end() !== DECODER_SUCCESS) {
+      if (decoder.end() !== DECODER_OK) {
         decodeError = true;
       }
       imageBytes = decoder.data8;