first commit

packages/nodes-base/nodes/Mattermost/v1/actions/reaction/create/description.ts

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+import type { ReactionProperties } from '../../Interfaces';
+
+export const reactionCreateDescription: ReactionProperties = [
+	{
+		displayName: 'User Name or ID',
+		name: 'userId',
+		type: 'options',
+		typeOptions: {
+			loadOptionsMethod: 'getUsers',
+		},
+		options: [],
+		default: '',
+		required: true,
+		displayOptions: {
+			show: {
+				resource: ['reaction'],
+				operation: ['create'],
+			},
+		},
+		description:
+			'ID of the user sending the reaction. Choose from the list, or specify an ID using an <a href="https://docs.n8n.io/code/expressions/">expression</a>.',
+	},
+	{
+		displayName: 'Post ID',
+		name: 'postId',
+		type: 'string',
+		default: '',
+		placeholder: '3moacfqxmbdw38r38fjprh6zsr',
+		required: true,
+		displayOptions: {
+			show: {
+				resource: ['reaction'],
+				operation: ['create'],
+			},
+		},
+		description:
+			'ID of the post to react to. Obtainable from the post link: <code>https://mattermost.internal.n8n.io/[server]/pl/[postId]</code>',
+	},
+	{
+		displayName: 'Emoji Name',
+		name: 'emojiName',
+		type: 'string',
+		default: '',
+		required: true,
+		displayOptions: {
+			show: {
+				resource: ['reaction'],
+				operation: ['create'],
+			},
+		},
+		description: 'Emoji to use for this reaction',
+	},
+];

packages/nodes-base/nodes/Mattermost/v1/actions/reaction/create/execute.ts

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+import type { IExecuteFunctions, IDataObject, INodeExecutionData } from 'n8n-workflow';
+
+import { apiRequest } from '../../../transport';
+
+export async function create(
+	this: IExecuteFunctions,
+	index: number,
+): Promise<INodeExecutionData[]> {
+	const qs = {} as IDataObject;
+	const requestMethod = 'POST';
+	const endpoint = 'reactions';
+	const body = {
+		user_id: this.getNodeParameter('userId', index),
+		post_id: this.getNodeParameter('postId', index),
+		emoji_name: (this.getNodeParameter('emojiName', index) as string).replace(/:/g, ''),
+		create_at: Date.now(),
+	} as { user_id: string; post_id: string; emoji_name: string; create_at: number };
+
+	const responseData = await apiRequest.call(this, requestMethod, endpoint, body, qs);
+
+	return this.helpers.returnJsonArray(responseData as IDataObject[]);
+}

packages/nodes-base/nodes/Mattermost/v1/actions/reaction/create/index.ts

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+import { reactionCreateDescription as description } from './description';
+import { create as execute } from './execute';
+
+export { description, execute };