From 14d771736b3d3cf8b5769ab32f772b3821a9875a Mon Sep 17 00:00:00 2001
From: Fumiaki MATSUSHIMA <mtsmfm@gmail.com>
Date: Mon, 30 Aug 2021 12:03:33 +0000
Subject: [PATCH] Add CancellationError

---
 packages/core/src/common/cancellation.ts         | 7 +++++++
 packages/plugin-ext/src/plugin/plugin-context.ts | 5 +++--
 packages/plugin/src/theia.d.ts                   | 4 ++++
 3 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/packages/core/src/common/cancellation.ts b/packages/core/src/common/cancellation.ts
index 117955c34a6be..a0af2f373e0ce 100644
--- a/packages/core/src/common/cancellation.ts
+++ b/packages/core/src/common/cancellation.ts
@@ -48,6 +48,13 @@ export namespace CancellationToken {
     });
 }
 
+export class CancellationError extends Error {
+    constructor() {
+        super('Canceled');
+        this.name = this.message;
+    }
+}
+
 class MutableToken implements CancellationToken {
 
     private _isCancelled: boolean = false;
diff --git a/packages/plugin-ext/src/plugin/plugin-context.ts b/packages/plugin-ext/src/plugin/plugin-context.ts
index e71522501ed40..fd9dc1337705d 100644
--- a/packages/plugin-ext/src/plugin/plugin-context.ts
+++ b/packages/plugin-ext/src/plugin/plugin-context.ts
@@ -149,7 +149,7 @@ import { LanguagesExtImpl } from './languages';
 import { fromDocumentSelector, pluginToPluginInfo, fromGlobPattern } from './type-converters';
 import { DialogsExtImpl } from './dialogs';
 import { NotificationExtImpl } from './notification';
-import { CancellationToken } from '@theia/core/lib/common/cancellation';
+import { CancellationToken, CancellationError } from '@theia/core/lib/common/cancellation';
 import { score } from '@theia/callhierarchy/lib/common/language-selector';
 import { MarkdownString } from './markdown-string';
 import { TreeViewsExtImpl } from './tree/tree-views';
@@ -952,7 +952,8 @@ export function createAPIFactory(
             SemanticTokensEdit,
             ColorThemeKind,
             SourceControlInputBoxValidationType,
-            FileDecoration
+            FileDecoration,
+            CancellationError
         };
     };
 }
diff --git a/packages/plugin/src/theia.d.ts b/packages/plugin/src/theia.d.ts
index 5f51e2761150a..ecd9009ffcf59 100644
--- a/packages/plugin/src/theia.d.ts
+++ b/packages/plugin/src/theia.d.ts
@@ -2018,6 +2018,10 @@ declare module '@theia/plugin' {
         onDidDelete: Event<Uri>;
     }
 
+    export class CancellationError extends Error {
+        constructor();
+    }
+
     /**
      * A cancellation token used to request cancellation on long running
      * or asynchronous task.