🐛 Fix slack as_user (#708)

* Ignore as_user only when it is false

* Update as_user description

packages/nodes-base/nodes/Slack/MessageDescription.ts

@@ -91,7 +91,7 @@ export const messageFields = [
 				],
 			},
 		},
-		description: 'Post the message as authenticated user instead of bot.',
+		description: 'Post the message as authenticated user instead of bot. Works only with user token.',
 	},
 	{
 		displayName: 'User Name',
@@ -486,6 +486,26 @@ export const messageFields = [
 		},
 		description: `Timestamp of the message to be updated.`,
 	},
+	{
+		displayName: 'As User',
+		name: 'as_user',
+		type: 'boolean',
+		default: false,
+		displayOptions: {
+			show: {
+				authentication: [
+					'accessToken',
+				],
+				operation: [
+					'update'
+				],
+				resource: [
+					'message',
+				],
+			},
+		},
+		description: 'Pass true to update the message as the authed user. Works only with user token.',
+	},
 	{
 		displayName: 'Update Fields',
 		name: 'updateFields',

packages/nodes-base/nodes/Slack/Slack.node.ts

@@ -452,12 +452,9 @@ export class Slack implements INodeType {
 					}
 					if (body.as_user === false) {
 						body.username = this.getNodeParameter('username', i) as string;
+						delete body.as_user;
 					}
 
-					// ignore body.as_user as it's deprecated
-
-					delete body.as_user;
-
 					if (!jsonParameters) {
 						const attachments = this.getNodeParameter('attachments', i, []) as unknown as Attachment[];
 						const blocksUi = (this.getNodeParameter('blocksUi', i, []) as IDataObject).blocksValues  as IDataObject[];