first commit

packages/nodes-base/nodes/Mattermost/v1/actions/message/postEphemeral/description.ts

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+import type { MessageProperties } from '../../Interfaces';
+
+export const messagePostEphemeralDescription: MessageProperties = [
+	{
+		displayName: 'User Name or ID',
+		name: 'userId',
+		type: 'options',
+		typeOptions: {
+			loadOptionsMethod: 'getUsers',
+		},
+		options: [],
+		default: '',
+		required: true,
+		displayOptions: {
+			show: {
+				operation: ['postEphemeral'],
+				resource: ['message'],
+			},
+		},
+		description:
+			'ID of the user to send the ephemeral message to. Choose from the list, or specify an ID using an <a href="https://docs.n8n.io/code/expressions/">expression</a>.',
+	},
+	{
+		displayName: 'Channel Name or ID',
+		name: 'channelId',
+		type: 'options',
+		typeOptions: {
+			loadOptionsMethod: 'getChannels',
+		},
+		default: '',
+		required: true,
+		displayOptions: {
+			show: {
+				operation: ['postEphemeral'],
+				resource: ['message'],
+			},
+		},
+		description:
+			'ID of the channel to send the ephemeral message in. Choose from the list, or specify an ID using an <a href="https://docs.n8n.io/code/expressions/">expression</a>.',
+	},
+	{
+		displayName: 'Message',
+		name: 'message',
+		type: 'string',
+		default: '',
+		displayOptions: {
+			show: {
+				operation: ['postEphemeral'],
+				resource: ['message'],
+			},
+		},
+		description: 'Text to send in the ephemeral message',
+	},
+];

packages/nodes-base/nodes/Mattermost/v1/actions/message/postEphemeral/execute.ts

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+import type { IExecuteFunctions, IDataObject, INodeExecutionData } from 'n8n-workflow';
+
+import { apiRequest } from '../../../transport';
+
+export async function postEphemeral(
+	this: IExecuteFunctions,
+	index: number,
+): Promise<INodeExecutionData[]> {
+	const qs = {} as IDataObject;
+	const requestMethod = 'POST';
+	const endpoint = 'posts/ephemeral';
+
+	const body = {
+		user_id: this.getNodeParameter('userId', index),
+		post: {
+			channel_id: this.getNodeParameter('channelId', index),
+			message: this.getNodeParameter('message', index),
+		},
+	} as IDataObject;
+
+	const responseData = await apiRequest.call(this, requestMethod, endpoint, body, qs);
+
+	return this.helpers.returnJsonArray(responseData as IDataObject[]);
+}

packages/nodes-base/nodes/Mattermost/v1/actions/message/postEphemeral/index.ts

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+import { messagePostEphemeralDescription as description } from './description';
+import { postEphemeral as execute } from './execute';
+
+export { description, execute };