first commit

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

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+import type { ChannelProperties } from '../../Interfaces';
+
+export const channelCreateDescription: ChannelProperties = [
+	{
+		displayName: 'Team Name or ID',
+		name: 'teamId',
+		type: 'options',
+		typeOptions: {
+			loadOptionsMethod: 'getTeams',
+		},
+		options: [],
+		default: '',
+		required: true,
+		displayOptions: {
+			show: {
+				operation: ['create'],
+				resource: ['channel'],
+			},
+		},
+		description:
+			'The Mattermost Team. Choose from the list, or specify an ID using an <a href="https://docs.n8n.io/code/expressions/">expression</a>.',
+	},
+	{
+		displayName: 'Display Name',
+		name: 'displayName',
+		type: 'string',
+		default: '',
+		placeholder: 'Announcements',
+		displayOptions: {
+			show: {
+				operation: ['create'],
+				resource: ['channel'],
+			},
+		},
+		required: true,
+		description: 'The non-unique UI name for the channel',
+	},
+	{
+		displayName: 'Name',
+		name: 'channel',
+		type: 'string',
+		default: '',
+		placeholder: 'announcements',
+		displayOptions: {
+			show: {
+				operation: ['create'],
+				resource: ['channel'],
+			},
+		},
+		required: true,
+		description: 'The unique handle for the channel, will be present in the channel URL',
+	},
+	{
+		displayName: 'Type',
+		name: 'type',
+		type: 'options',
+		displayOptions: {
+			show: {
+				operation: ['create'],
+				resource: ['channel'],
+			},
+		},
+		options: [
+			{
+				name: 'Private',
+				value: 'private',
+			},
+			{
+				name: 'Public',
+				value: 'public',
+			},
+		],
+		default: 'public',
+		description: 'The type of channel to create',
+	},
+];

packages/nodes-base/nodes/Mattermost/v1/actions/channel/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 body = {} as IDataObject;
+	const qs = {} as IDataObject;
+	const requestMethod = 'POST';
+	const endpoint = 'channels';
+
+	const type = this.getNodeParameter('type', index) as string;
+
+	body.team_id = this.getNodeParameter('teamId', index) as string;
+	body.display_name = this.getNodeParameter('displayName', index) as string;
+	body.name = this.getNodeParameter('channel', index) as string;
+	body.type = type === 'public' ? 'O' : 'P';
+
+	const responseData = await apiRequest.call(this, requestMethod, endpoint, body, qs);
+
+	return this.helpers.returnJsonArray(responseData as IDataObject[]);
+}

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

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