first commit

packages/nodes-base/nodes/Mattermost/v1/actions/user/getById/description.ts

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+import type { UserProperties } from '../../Interfaces';
+
+export const userGetByIdDescription: UserProperties = [
+	{
+		displayName: 'User IDs',
+		name: 'userIds',
+		type: 'string',
+		required: true,
+		displayOptions: {
+			show: {
+				resource: ['user'],
+				operation: ['getById'],
+			},
+		},
+		default: '',
+		description: "User's ID",
+	},
+	{
+		displayName: 'Additional Fields',
+		name: 'additionalFields',
+		type: 'collection',
+		placeholder: 'Add Field',
+		displayOptions: {
+			show: {
+				resource: ['user'],
+				operation: ['getById'],
+			},
+		},
+		default: {},
+		options: [
+			{
+				displayName: 'Since',
+				name: 'since',
+				type: 'dateTime',
+				default: '',
+				description:
+					'Only return users that have been modified since the given Unix timestamp (in milliseconds)',
+			},
+		],
+	},
+];

packages/nodes-base/nodes/Mattermost/v1/actions/user/getById/execute.ts

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+import type { IExecuteFunctions, IDataObject, INodeExecutionData } from 'n8n-workflow';
+
+import { apiRequest } from '../../../transport';
+
+export async function getById(
+	this: IExecuteFunctions,
+	index: number,
+): Promise<INodeExecutionData[]> {
+	const qs = {} as IDataObject;
+	const requestMethod = 'POST';
+	const endpoint = 'users/ids';
+	const userIds = (this.getNodeParameter('userIds', index) as string).split(',');
+	const additionalFields = this.getNodeParameter('additionalFields', index);
+	const body = userIds;
+
+	if (additionalFields.since) {
+		qs.since = new Date(additionalFields.since as string).getTime();
+	}
+
+	const responseData = await apiRequest.call(this, requestMethod, endpoint, body, qs);
+
+	return this.helpers.returnJsonArray(responseData as IDataObject[]);
+}

packages/nodes-base/nodes/Mattermost/v1/actions/user/getById/index.ts

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+import { userGetByIdDescription as description } from './description';
+import { getById as execute } from './execute';
+
+export { description, execute };