first commit

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

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+import type { ReactionProperties } from '../../Interfaces';
+
+export const reactionDeleteDescription: ReactionProperties = [
+	{
+		displayName: 'User Name or ID',
+		name: 'userId',
+		type: 'options',
+		typeOptions: {
+			loadOptionsMethod: 'getUsers',
+		},
+		options: [],
+		default: '',
+		required: true,
+		displayOptions: {
+			show: {
+				resource: ['reaction'],
+				operation: ['delete'],
+			},
+		},
+		description:
+			'ID of the user whose reaction to delete. 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: ['delete'],
+			},
+		},
+		description:
+			'ID of the post whose reaction to delete. 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: ['delete'],
+			},
+		},
+		description: 'Name of the emoji to delete',
+	},
+];

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

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+import type { IExecuteFunctions, IDataObject, INodeExecutionData } from 'n8n-workflow';
+
+import { apiRequest } from '../../../transport';
+
+export async function del(this: IExecuteFunctions, index: number): Promise<INodeExecutionData[]> {
+	const userId = this.getNodeParameter('userId', index) as string;
+	const postId = this.getNodeParameter('postId', index) as string;
+	const emojiName = (this.getNodeParameter('emojiName', index) as string).replace(/:/g, '');
+
+	const qs = {} as IDataObject;
+	const requestMethod = 'DELETE';
+	const endpoint = `users/${userId}/posts/${postId}/reactions/${emojiName}`;
+	const body = {} 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/reaction/del/index.ts

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+import { reactionDeleteDescription as description } from './description';
+import { del as execute } from './execute';
+
+export { description, execute };